BOND STRENGTH AND INTERFACIAL MORPHOLOGY OF A MULTIMODE ADHESIVE RESIN CEMENT TO ENAMEL AND DENTIN
A
Holiel
Instructor at the Conservative Dentistry Department, Faculty of Dentistry, Alexandria University, Egypt
author
W
Abdel-Fattah
author
B
El Mallakh
author
text
article
2015
eng
Introduction: Resin cements are used for cementation of indirect restorations. A high-quality adhesion to tooth structure is primordial for thesuccess of indirect cemented restorations.Objectives: Were to assess the shear bond strength of RelyX ultimate adhesive resin cement to both enamel and dentin when used in differentapplication modes (self-etch and total-etch) and to study resin-tooth interfaces using SEM.Materials and methods: 40 enamel specimens and 40 dentin specimens were used in this study. Each substrate specimens were randomlydivided into four groups of 10 specimens each according to resin cement applied: Enamel groups: Group A1: RelyX ultimate as total-etch; Group < br />A2: RelyX ultimate as self-etch; Group A3: Variolink II; Group A4: Multilink automix. Dentin groups: Group B1: RelyX ultimate as total-etch;Group B2: RelyX ultimate as self-etch; Group B3: Variolink II; Group B4: Multilink automix. Resin cements were built over the surfaces followingmanufacturer's instructions in a plastic tube. All specimens were thermocycled (500 cycles, 5°/55°C, 15 sec dwell time) then shear bond strength wasmeasured in MPa and data were analyzed using F-test (ANOVA) and Post Hoc test. Three specimens from each group were further sectioned, goldsputtered and evaluated under SEM.Results: All enamel groups showed a statistically significant difference for shear bond strength with P value of 35.60 MPa. While for dentin, there was no statistically significant differences among groups with P=0.053. Interfacial morphology ofRelyX ultimate in total-etch mode showed better interface morphology and improved tag length compared to respective self-etch counterpartConclusions: An etching step prior to multi-mode adhesive resin cement increased its bond strength values and improved its penetration pattern toboth enamel and dentin, also length of resin tags formed by total-etch adhesives seems not to play an important role in determining bond strength
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
133
139
https://adjalexu.journals.ekb.eg/article_59122_23857bf4c5c933d9d4711efcac12979b.pdf
dx.doi.org/10.21608/adjalexu.2015.59122
EVALUATION OF COMBINATION OF BIPHASIC CALCIUM PHOSPHATE AND PLATELET-RICH FIBRIN AS GRAFTING MATERIAL FOR SINUS LIFT AUGMENTATION
Khalfalla
Aimen E
B.D.S. Faculty of Dentistry, Tripoli University.
author
Fahmy
Magued H.
author
Ashwah
Adham A
author
text
article
2015
eng
Introduction: The performance of implant surgery in the posterior maxilla often poses challenges due to insufficient available bone. Sinus floorelevation is developed to increase needed vertical height to overcome this problem. Many grafting materials had been used to augment subsinusarea. Recently, several authors have shown that simultaneous sinus lift and implantation using autologous platelet-rich fibrin combined withbiphasic calcium phosphate as a grafting material is a reliable procedure promoting bone augmentation in the maxillary sinus.Objectives: This study was aiming to evaluate bone formation after maxillary sinus membrane elevation using lateral window technique andsimultaneous implant placement using biphasic calcium phosphate combined with platelet rich fibrinas agrafting material.Materials and methods: The present study was conducted on ten patients with age ranged from 30-50 years seeking implantation of their lostposterior maxillary teeth, and had limited bone height below the floor of the maxillary sinus, secondary to sinus pneumatization. Patients wereselected on the basis of history, clinical examination and radiographic examination using panoramic radiography and cone-beam CT.Conclusion: Platelet-rich fibrin in addition to biphasic calcium phosphate may favor the formation of new bone after maxillary sinus augmentation.The effectiveness of PRF depends not only on its features but also the properties of co-administered grafting material.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
140
147
https://adjalexu.journals.ekb.eg/article_59131_f415eee2314f23b5f6d66f4b7357d9c0.pdf
dx.doi.org/10.21608/adjalexu.2015.59131
EVALUATION OF TOPICAL OZONE THERAPY ON HEALING OF MANDIBULAR BONY DEFECTS
S.T
Mohamed
B.D.S. Faculty of Dentistry, Alexandria University
author
A.A
Sharara
author
H.R
Ragab
author
N.M
Zahran
author
text
article
2015
eng
Introduction: Bone defects are commonly found in oral cavity, they may have functional or esthetical problems that need surgical intervention.The emergence of ozone therapy seems to be a promising future in different dental modalities that may be effective in treating bony defects.Objective: To evaluate histologically the effect of topical administration of ozone therapy; on healing of experimentally-induced mandibular bonedefects; in dogs.Materials and methods: A split mouth design was carried out below the 4th mandibular premolar of six healthy mongrel dogs. A total of 12 bonydefects were surgically created. After reflecting the mucoperiosteal flap, the defects in the right side were treated with ozonated gel and those in theleft side did not receive any treatment. Two dogs were sacrificed after 2, 6, 12 weeks. Samples were dissected and prepared for histologicalevaluationResults: The study revealed that using ozone gel in bony mandibular defects accelerates the onset of new bone formation and increasesvascularization at the injured site.Conclusion: Ozone is a beneficial agent to avoid possible complications and to have better chance for soft and hard tissue healing.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
148
152
https://adjalexu.journals.ekb.eg/article_59133_5cae6a2535fafc19cfe47b053d2e095f.pdf
dx.doi.org/10.21608/adjalexu.2015.59133
THE USE OF N-BUTYL CYANOACRYLATE ADHESIVE IN THE CLOSURE OF MUCOPERIOSTEAL FLAP AFTER THE SURGICAL EXTRACTION OF IMPACTED MANDIBULAR THIRD MOLAR
M
Rewainy
Bachelor in dentistry, BDS, Faculty of Dentistry, University of Alexandria.
author
S
Osman
author
N
El-prince
author
text
article
2015
eng
Introduction: Surgical extraction of impacted third molars has become a routine procedure in most of dental clinics. Tissue adhesives based on Nbutylcyanoacrylate are employed as a non-suture method for intra-oral postsurgical wound closure.Objectives: Evaluation of the clinical post-operative complications after the use of N-butyl cyanoacrylate soft tissue adhesive in closure ofmucoperiosteal flaps after the surgical extraction of impacted mandibular third molars compared to the use of conventional silk sutures.Materials and methods: This study was conducted on twenty patients of both sexes ranging from 20 to 30 years of age.Patients were dividedequally into two groups (Study and control groups) each with mesioangular impacted mandibular third molar (class II position B according to Pelland Gregory’s classification). After the surgical extraction of impacted teeth the flaps were closed using PeriAcryl 90 (Glustitch corporation, Delta,BC, Canada) soft tissue adhesive in the study group and using 3/0 silk sutures in the control group. Patients were evaluated for pain, bleeding,trismus, facial swelling, wound dehiscence and local reaction.Results: There was a statistically significant reduction of pain, bleeding, trismus, wound reaction on using the N-butyl cyanoacrylate (PeriAcryl 90)compared to sutures , concerning wound dehiscence and facial swelling , the results of both materials were nearly the same.Conclusion: The use of the N-butyl cyanoacrylate (PeriAcryl 90) for the closure of mucoperiosteal flaps is a reliable method that can overcomemost of complications faced on using conventional silk sutures in addition to ease of manipulation , time saving and safety factors.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
152
159
https://adjalexu.journals.ekb.eg/article_59139_308e3a90c4c7ac98e21e39308bd1b378.pdf
dx.doi.org/10.21608/adjalexu.2015.59139
COMPARATIVE STUDY OF ARTHROCENTESIS WITH OR WITHOUT USING PIROXICAM IN THE MANAGEMENT OF TEMPOROMANDIBULAR JOINT DISORDERS
S.N
AL-Said
B.D.S. Faculty of Dentistry, October 6 University.
author
N
Shawky
author
H.R
Ragab
author
text
article
2015
eng
pain and dysfunction including limitation of mandibular movement. Arthrocentesis is joint lavage which washes out these inflammatory mediators,thereby, relieving pain.Objective: To evaluate the efficacy of arthrocentesis with and without the injection of piroxicam on TMD.Materials and methods: This study was conducted on twenty patients with clinical and radiological diagnosis of TMD included in the studydivided into equal groups. Ten patients were subjected to conventional arthrocentesis with saline solution alone, other ten patients underwentarthrocentesis by injection of piroxicam. Patient's evaluation will be preoperatively and postoperatively following the procedure and after 1st, 2ndweek, 1 and 6 months. Magnetic resonance imaging (MRI) was performed in both groups before starting the treatment.Results: Evaluation of assisted and unassisted mouth opening showed increase at all time intervals. There was significant improvement in pain,range of motion, joint effusion and joint sounds.Conclusion: Arthrocentesis combined with piroxicam injections is superior to arthrocentesis alone in reducing impairment in patients with TMD onits clinical outcome.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
160
165
https://adjalexu.journals.ekb.eg/article_59142_38b1785ad7aa9d5b88664d65373be946.pdf
dx.doi.org/10.21608/adjalexu.2015.59142
EFFECT OF COLLAPLUG® ON THE HEALING OF EXTRACTION SOCKETS IN PATIENTS UNDER ORAL ANTICOAGULANT THERAPY (CLINICAL STUDY)
M
Abdelaziz
Resident in Maxillofacial and Plastic Surgery Department, Faculty of Dentistry, Alexandria University.
author
R
Shaaban
author
S
Abdelhalim
author
M
Sadaka
author
text
article
2015
eng
Introduction: Dentists perform a variety of surgical procedures frequently requiring the need for a hemostatic agent, in cases where oralanticoagulants are used. Most cases of postoperative bleeding are easily treated with local measures such as packing with a haemostatic dressing,suturing and pressure.Objectives: We aimed to evaluate the efficacy of Collaplug® in minimizing postoperative bleeding and pain following tooth extraction in patientsunder oral anticoagulant therapy.Materials and methods: A prospective study was conducted on a total of 40 adult patients under oral anticoagulant therapy, who needed toothextraction. Patients were divided equally into two groups, each group consisting of 20 patients. Group A (Study group): the extraction of the toothwas followed by the application of Collaplug® prior to suturing of the socket. Group B (Control group): the extraction of the tooth was followed bysuturing only.Results: A total of 40 patients 21 female (52%) and 19 (48%) male, aged between 30 and 60 years were included in the present study. All patientsunderwent simple tooth extraction. In the study group: there was a clinical significance in cessation of bleeding 2 hours and 6 hours after extractionthan the control group. All patients of study and control groups had their international normalized ratio (INR)Conclusion:The study concluded that Collaplug® is an effective local hemostatic material following minor oral surgery in patients under oral anticoagulanttherapy, also shows acceleration of soft tissue healing and reduce postoperative pain.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
166
172
https://adjalexu.journals.ekb.eg/article_59145_d8ce164287f0db4859c5453be9c0eaa4.pdf
dx.doi.org/10.21608/adjalexu.2015.59145
EFFECT OF ANTIOXIDANT TREATMENT AND DELAYED BONDING ON SHEAR BOND STRENGTH OF PORCELAIN LAMINATE VENEERS BONDED TO BLEACHED ENAMEL (IN VITRO STUDY)
S
Beltagui
Dentist, Faculty of Dentistry, Alexandria University, Egypt.
author
S
Bakry
author
S
Hussein
author
M
Mohy El Din
author
text
article
2015
eng
Introduction: Porcelain laminate veneers are sometimes necessary after bleaching in patients requiring marked change in tooth color. Bondingfollowing bleaching has been shown to be compromised. The use of an antioxidant agent and delayed bonding could improve bonding.Aim of the study: was to evaluate the effect of antioxidant treatment and delayed bonding, one week after bleaching, on the shear bond strength ofporcelain laminate veneers bonded to bleached enamel in comparison with immediate bonding after bleaching.Materials and methods: Forty freshly extracted maxillary central incisors with flat enamel surfaces were prepared and divided into four groups(n=10/group). Three test groups were bleached with 40% hydrogen peroxide (Power Whitening) and one control group was left as unbleachedenamel. Forty glass ceramic discs were fabricated using IPS e.max Press to be bonded to the enamel surface. Group A:antioxidant treatedspecimens. Bleached specimens were treated with an antioxidant agent, 10% sodium ascorbate, for 10 minutes then glass ceramic discs werebonded to the specimens. Group B:delayed bonded specimens. Bleached specimens were stored in artificial saliva for 7 days then glass ceramicdiscs were bonded to the specimens. Group C: immediate bonded specimens. Glass ceramic discs were immediately bonded to bleached specimens.Group D:control group. Glass ceramic discs were bonded to unbleached specimens. Dual cured resin cement (RelyX U200) was used for bonding.Following bonding, the specimens were thermocycled for 600 cycles corresponding to one clinical year service then tested for shear bond strengthusing a universal testing machine at a crosshead speed of 0.5 mm/min. Bond failure analysis was evaluated for the specimens using astereomicroscope and random samples were chosen to be tested under a scanning electron microscope.Results: No significant difference was found between the control, delayed bonding and antioxidant treated group (p < 0.001). Immediately bondedgroup showed significantly lower mean bond strength with glass ceramic discs than all groups (p < 0.001).Conclusions: It is recommended to delay bonding for one week after bleaching or use 10% sodium ascorbate to reverse bleaching.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
173
179
https://adjalexu.journals.ekb.eg/article_59148_32202e3605b18589b58829cc80048b81.pdf
dx.doi.org/10.21608/adjalexu.2015.59148
STUDY OF ODONTOGENIC TUMORS IN THE FACULTY OF DENTISTRY ALEXANDRIA UNIVERSITY AND THE POSSIBLE ROLE OF NESTIN AS A MARKER
M.M
Saleh
1.Instructor at Oral Pathology Department, Faculty of Dentistry, Alexandria University.
author
Z.E
Darwish
author
S.E
Riad
author
A.M
Medra
author
text
article
2015
eng
originate from epithelium, ectomesenchyme or both. Varying degrees of inductive interaction between these embryonic components of the developing toothgerm exist. Nestin is one of the intermediate filaments constituting the cytoskeleton and is known as a marker of neural stem cells or progenitor cells. HumanNestin expression continues during tooth development and disappears when development is complete.Aim of the work: To study the expression of Nestin in different odontogenic tumors, and to highlight the incidence of odontogenic tumors in the Faculty of dentistry,Alexandria University, Egypt in the past 10 years.Material and Methods: Immunohistochemical analysis was performed on 22 surgical specimens of odontogenic tumors and one control specimenfrom normal tooth germ.Immunohistochemical staining was performed using a Labeled Strept-Avidin Biotin complex method (LSAB).Results:Almost all the ameloblastomas were negative for Nestin while all cases of odontogenic fibromyxoma , myxoma and odontogenic fibromashowed intense brownish cytoplasmic reaction in both the ectomesenchymal cells and the odontogenic epithelial rests. Ameloblastic fibroma andameloblastic fibro-odontom cases showed immunopositivity of Nestin in the ameloblast like cells and stellate reticulum like cells as well as thestromal cells. Calcific structures such as dentinoid as well as hamartomatous lesions mainly odontomes were completely negative for Nestin. Theresults of the statistical analysis revealed higher prevalence of keratocystic odontogenic tumor followed by ameloblastoma.Conclusion:Nestin is expressed in some odontogenic tumors in which the ectomesenchyme of the neural crest origin, constituting a part of theirproliferated tissue. In the statistical analysis which was done in this study,there was statistical difference regarding types.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
180
185
https://adjalexu.journals.ekb.eg/article_59150_c569d9938417e94f8acd7fb78dca228e.pdf
dx.doi.org/10.21608/adjalexu.2015.59150
COMPARATIVE STUDY BETWEEN LASER SINTERED IMPLANT AND ACID ETCHED IMPLANT SEATED IN THE MAXILLARY PREMOLAR AREA
A
Halwag
B.D.S. Faculty of Dentistry, Alexandria University
author
N
El Prince
author
R
Eldibany
author
text
article
2015
eng
laser fabrication (DLF) is a new technology by which we can produce a dental implant with complex geometry that allows better osseointegration,through enhancing the differentiation of stem cells into osteoblasts and endotheliocytes leading to bone formation around the implant in a better andquicker way.Objectives: to compare osseointegration between laser sintered implants and acid etched implants.Materials and methods: This randomized clinical trial was conducted on twenty patients having edentulous spaces in the maxillary premolar area.They were divided equally into two groups, group A and group B, ten patients in each group. Laser sintered implants were placed in the edentulousspaces in group A patients, while conventional implants were placed in group B patients. Clinical and radiographic evaluations were carried outafter 4, 6 and 9 months for both groups.Results: : Regarding the plaque index the scores of group A were found to be insignificantly lower than those of group B at 4 and 6 months andsignificantly lower at 9 months. The mean probing depth values in group A were significantly lower than group B at 4 and 6 months andinsignificantly lower at 9 months. While, the implant mobility score was 0 for both groups. Regarding the mean marginal bone defect, values forgroup A were insignificantly lower than group B at 4 months, while significantly lower at 6 and 9 months.Conclusion: The use of both laser sintered and acid etched implants for replacement of maxillary premolars have significant success
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
186
191
https://adjalexu.journals.ekb.eg/article_59151_610cef3b3da51c23e8a71f3454d8fa4c.pdf
dx.doi.org/10.21608/adjalexu.2015.59151
TREATMENT OF RECURRENT TEMPOROMANDIBULAR JOINT DISLOCATION WITH BOTULINUM TOXIN
B
Shehata
Master student at the Oral and Maxillofacial Surgery department, Faculty of Dentistry, Alexandria University.
author
S
Darwish
author
T
Aly
author
G
Younis
author
text
article
2015
eng
Introduction: The use of botulinum toxin type A (BTX-A) injection as it is a more recently reported treatment to alter the musculature withthe intended effect to weaken the lateral pterygoid muscle (LPM) sufficiently to prevent temporomandibular joint (TMJ) dislocation. Thiscaused a new imbalance between the muscles used for opening and closing the jaws, and mouth opening was slightly limited because of theweakness of the LPM.Objectives: To evaluate the efficacy of injection of BTX-A as the first choice of treatment for patients with chronic TMJ dislocation notresponding to conservative line of treatment.Materials and methods: A prospective study was conducted on a total of 20 patients complaining of recurrent episodes of chronic TMJdislocation. Group A: (The study group) patients were injected with BTX-A in the LPM through an intraoral approach, Group B: (The controlgroup) patients suffering from chronic TMJ dislocation and treated by inter maxillary fixation (IMF).Results: The study revealed that injecting BTX-A in the LPM prevents the TMJ dislocation and reduced pain caused by the movement of theLPM by 90 % through temporary paralysis of the muscle, thus allowing the muscle to move more naturally.Conclusions: This is a relatively conservative option, injection into the muscle is straightforward and can be done in outpatients with fewcomplications.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
200
207
https://adjalexu.journals.ekb.eg/article_59152_8035b62b866158375a45509f22005b2e.pdf
dx.doi.org/10.21608/adjalexu.2015.59152
Effect of Circumferential and Axial Grooves on the Retention of Provisionally Cement-Retained Implant-Supported Crowns (In Vitro Study)
H
Badawi
Conservative Dentistry Department, Faculty of Dentistry, Alexandria University.
2 Professor of Fixed Prosthodontics, Conservative Dentistry Department, Faculty of Dentistry
author
Y
Aboushady
author
A
Azer
author
text
article
2015
eng
Introduction: Retention of provisionallycemented implant-supported restorations plays an important role in success of the treatment. Uncementedrestorations may cause several problems such as restoration swallowing, increased bone loss and prosthesis failure. Therefore, suitable cementcompromising between retention and retrievability as well as extra-means of abutment retention might be preferable for durable implantrestorations.Objectives: This study introduced circumferential and axial grooves on implant abutments as retentive promoters and evaluated their effect on theretention of crown copings cemented to implant abutments with provisional luting cements.Materials and methods: Twenty straight titanium implant abutments were divided into 4 groups (n=5): without grooves, with 1 axial groove, with2 circumferential grooves, and with 3 circumferential grooves. Twenty nickel chromium crown copings were fabricated to fit all 20 abutments. Thecopings were cemented to each group of abutments with non-eugenol provisional cement. After storage for 24 hours in 100% humidity at 37°C,specimens were subjected to 500 cycles of thermal cycling, then 5000 cycles of compressive load to simulate the thermal and mechanical stresses inthe oral environment. Tensile strengths were conducted with a universal testing machine and tensile stresses were recorded in Newton. After theretention test, the copings and abutments were evaluated for cement failure mode with Stereoscopic Microscope. Collected data were analyzedusing one-way analysis of variance (ANOVA) and Tukey’s HSD tests (α=.05).Results: The mean tensile strength of the three circumferential grooves was significantly higher than the other groups (P<0.001) while there was nosignificant difference between the axial groove and control group (P=0.999). The cement failure mode was generally adhesive in nature, althoughsome mixed failures were observed.Conclusion The surface modification of an implant abutment by means of circumferential grooves was found to be an effective method ofimproving the retention of crown copings cemented with non-eugenol cement.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
208
218
https://adjalexu.journals.ekb.eg/article_59154_a02aff558e54d9c210aa31d7c889dd40.pdf
dx.doi.org/10.21608/adjalexu.2015.59154
THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS
E.M
Emtair
B.D.S. Faculty of Dentistry Sirte University of science and technology
author
S
Bakry
author
A.S
Azer
author
text
article
2015
eng
Introduction: Clinical fracture resistance and marginal fit are regarded as major outcomes when considering the performance of all -ceramiccrown. Modifying axial wall tapering may influence on marginal fit and fracture resistance.Objectives: To investigate the effect of tooth preparation taper on marginal adaption and fracture resistance of CAD/CAM zirconia ceramiccopings.Materials and methods: A machined standard stainless steel dies representing lower first molar were made and fixed to a metal base to stimulatesingle prepared crowns with three different axial wall convergence angles (6°, 12°, 22°). Master dies were duplicated using silicon mold after whichfifteen crowns were reproduced for each group using epoxy resin material. All cores were fabricated using cercon zirconia and adhesively luted onepoxy resin dies. Measurement of marginal fit was performed with cone beam computed tomography. Specimens were subjected to fractureresistance test. The failure modes and points of fracture will be recorded. Data were statistically analysed using ANOVA test.Results: The results showed significant difference between three tested groups in marginal adaption, where 22 degree had significantly the best fitalso there was significant difference between three tested groups in fracture resistance, where 22 degree have showed highest fracture load.Conclusion: Within the limitations of this in vitro study, increasing the axial convergence angle of CAD/CAM zirconia core improved theirmarginal fit and increased their fracture strength.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
214
220
https://adjalexu.journals.ekb.eg/article_59155_2b99ae85618e99050e0a0222dd293d32.pdf
dx.doi.org/10.21608/adjalexu.2015.59155
COMPARISON BETWEEN CYLINDER AND TAPERED IMPLANTS IN DELAYED IMMEDIATE PLACEMENT
A
George
Bachelor in Dentistry, BDS, Faculty of Dentistry, Alexandria University.
author
A
Khalil
author
Hassan
Hassan
author
text
article
2015
eng
Background: Implant geometry has a major impact on insertion torque values and primary stability, and bone engagement duringimplant insertion differs according to implant morphology.Objective: This study was aimed to compare the implant survival and success as outcome of 2 types of implant morphology either the taperedor cylinder form in delayed immediate placement of dental implant.Materials and methods: A total of 20 implants (10 for tapered and 10 for cylinder implants) were inserted after tooth extraction i.e.delayed immediate implant placement. The primary stability of each implant was measured by using insertion torque value. Then,implant examined clinically and radiographically for success criteria after placement.Results: The insertion torque measurement was showed 38.50 ± 4.74Ncm as a mean value for the tapered implant and 26.0 ± 5.16 Ncmfor cylinder implant while the insertion time for tapered was 0.71 ± 0.07 second/mm and for cylinder was 0.95 ± 0.14 second/mm.Conclusion: Tapered implants showed better primary stability than straight-walled implants and had a higher success rate. A higherinsertion torque can lead to the destruction of peri-implant bone, compromising osseointegration and failure of dental implant.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
221
228
https://adjalexu.journals.ekb.eg/article_59156_2d5c2a0902a8432e687616daf60b48ef.pdf
dx.doi.org/10.21608/adjalexu.2015.59156
RESTORATIVE FAILURE RATE AFTER DENTAL TREATMENT OF EARLY CHILDHOOD CARIES UNDER GENERAL ANESTHESIA
N
Morsy
Resident at the pediatric Dentistry Department, Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
K
Dowidar
author
N
Bakry
author
text
article
2015
eng
Introduction: Comprehensive dental care of early childhood caries (ECC) is often accomplished under general anesthesia (GA). General anesthesiaallows dental treatment to be performed under optimal conditions thus ensuring an ideal outcome. Failures of restorations after dental rehabilitationwill increase the risk for caries development. Few studies have been carried out to evaluate the restorative failure rate of dental treatment under GAamong children with ECC.Objective: To assess the failure rate of restorations for children with early childhood caries undergoing dental treatment under general anesthesia.Materials and methods: Dental records of healthy children diagnosed with early childhood caries (ECC), aged 3-6 years, and had dental treatmentunder general anesthesia were reviewed. Data regarding restorative failure was gathered from two groups of children according to recall period(group I after 6 months, and group II after 12 months).Results: The highest failure rate in group I related was to composite restorations (96.2%), followed by anterior glass ionomer (91.7%), posteriorglass ionomer (20%), stainless steel crown (SSC) (1%), and finally amalgam (0%). In group II the highest failure rate was related to compositerestorations (88.5%), anterior GIC (77.8%),posterior GIC (28.6%),amalgam (13%), and finally SSC (5.6%).In composite restorations, fracture inboth groups was the main cause of failure, group I (100.0%), and group II (87.0%), whereas, secondary caries was the second cause in group II(13.0%). In group (I), no amalgam failure was recorded, while in group (II) secondary caries was the main cause of amalgam failure (67.0%),followed by fracture (33.0%). In both groups, fracture of restorations, and secondary caries were the main causes of anterior GIC failure (100.0%),and posterior GIC failure (100.0%). Loss of retention was the main cause of SSCs failure in both groups (100.0%).Conclusion: Anterior restorations have a higher failure rate than posterior restorations. Factors affecting restoration failure significantly were:Unsupervised tooth brushing, and failure to conform to recall appointments.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
229
233
https://adjalexu.journals.ekb.eg/article_59157_110df8d231db8bac3c7fc9ca10cfd46a.pdf
dx.doi.org/10.21608/adjalexu.2015.59157
EVALUATION OF THE EFFECT OF PLATELET RICH FIBRIN ON BONE HEALING AFTER SURGICAL REMOVAL OF IMPACTED MANDIBULAR THIRD MOLAR
E
Wageeh
B.D.S. Faculty of Dentistry, Alexandria University, Alexandria, Egypt
author
S
Osman
author
M
Fahmy
author
text
article
2015
eng
Introduction: Following the extraction of impacted mandibular third molars, there is a risk for developing new, or having persistentosseous periodontal defects on the distal aspects of the adjacent second molars.Objectives: To evaluate the effect of platelet rich fibrin (PRF) on bone healing distal to the second molar following removal ofimpacted mandibular third molar.Materials and methods: This was a parallel, controlled and randomized clinical trial. Twenty patients aged between 20-30 years,who have mesioangular position B impacted mandibular third molar indicated for surgical removal were selected for this study. Tenpatients were taken for the study group, where PRF was applied in the extraction socket of the mandibular third molar and 10 patientsfor the control group, where the extraction sockets were sutured without receiving PRF. The patients were evaluated clinically forpain, edema and trismus on the second, fourth and seventh day post-operatively and radiographically on the first, second and thirdmonth post-operatively. Standardized periapical x-ray films were taken for each patient preoperatively and on the first, second andthird postoperative months. Image-J Processing Program was used for the assessment of new bone formation at the distal surface ofthe second molar.Results: There was less pain and trismus in the study group than in the control group but the difference among them was notstatistically significant (p > 0.05). Edema was significantly lower in the study group than in the control group in the second andfourth postoperative days. There was significantly more bone density and higher bone level in the study group than in the controlgroup on the second and third postoperative months (p < 0.05).Conclusion: It is clear that PRF is biocompatible and can improve both soft tissue healing and bone regeneration after surgicalremoval of impacted mandibular third molar.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
234
241
https://adjalexu.journals.ekb.eg/article_59159_616f61e60ee65bf2a0af0af9a519589f.pdf
dx.doi.org/10.21608/adjalexu.2015.59159
EFFECT OF PROPOLIS ON INDUCED ALVEOLAR BONE LOSS IN DIABETIC RATS
H
Sherif
Demonstrator of oral biology - faculty of dentistry - Alexandria University.
author
A
El Sawa
author
S
Karam
author
text
article
2015
eng
inflammatory diseases. As DM accelerates bone resorption; when periodontal disease affects a diabetic individual, extensive alveolar boneloss occurs. Propolis is a natural antibiotic & anti-inflammatory agent that honey bees (Apis mellifera) collect from tree buds or otherbotanical sources; and use in the construction as well as the protection of their hives. Due to its broad pharmacological potential, propolis hasbeen employed extensively in medicine, since ancient times.Objective: Was to evaluate the effect of systemic administration of propolis on the alveolar bone loss, induced by periodontitis, in diabeticrats.Materials and methods: Twenty-four Albino rats were divided into three equal groups: group (1) normal control (NC), group (2) Diabetes+ Periodontitis (DP) and group (3) Diabetes + Periodontitis + Propolis (DP-Pro). DM type 1was induced in rats of groups (2) and (3), bysingle intraperitoneal injection of Streptozotocin. Then, periodontitis was induced by ligature placement sub marginally around the rightmandibular 1st molar. In group (3), propolis was administrated systemically by gastric feeding 400mg/Kg/day for 8weeks. At the end of thisperiod, animals were sacrificed and dissected. The alveolar bone surface integrity interproximally was evaluated by scanning electronmicroscopy (SEM), and results were compared between groups.Results: After 2 months, group (2) showed more alveolar bone loss compared to the 2 other groups. Groups (1) & (3) showed an intact,smooth & regular bone surface, while group (2) specimens showed an irregular & porous bone surface with extensive resorption.Conclusion: This study showed that the systemic administration of propolis effectively prevented the extensive alveolar bone lossassociated with experimental periodontitis in diabetic rat models. Thus, propolis might be used as an adjunctive treatment for periodontitisassociated with Diabetes.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
242
248
https://adjalexu.journals.ekb.eg/article_59160_5be33a1a8f34263bf5aa8c0e6d1744d2.pdf
dx.doi.org/10.21608/adjalexu.2015.59160
EXPRESSION OF MCM3 AND KI-67 AS DIAGNOSTIC MARKERS IN BENIGN AND MALIGNANT SALIVARY GLAND TUMORS
RM
Abdalla
Masters student of Oral Pathology, Faculty of Dentistry-Alexandria University
author
MH
El Abany
author
OR
Ramadan
author
M.A
Habib
author
text
article
2015
eng
Introduction: Salivary gland tumors (SGTs) may represent a considerable diagnostic challenge, primarily because of the complexity of theclassification and the rarity of several entities. Since proliferative activity is a reliable method to assess tumor biology. There has been continuousresearch to find such biological markers. Ki-67 is a widely accepted proliferation marker, with its expression tightly associated with the cell cycle. Itis implicated in many of human cancers as a prognostic factor. MCM-3, member of minichromosome maintenance proteins family, is upregulatedin proliferating cells. MCM-3 overexpression in almost all human cancers implicates that it might facilitate the tumorigenesis byplaying a role in the malignant transformation of cells.Objectives: to evaluate the MCM-3 protein expression in benign and malignant salivary gland tumors and compare the obtained results with theexpression of Ki-67 proliferation antigen.Materials and methods: Immunohistochemical analysis of 20 cases of SGTs with 2 sections from each specimen (20 sections for antiKi-67antibody and 20 sections for antiMCM3antibody) and 5 control cases. Immunohistochemical staining was performed using a Labeled Strept-Avidin Biotin method (LSAB).Results: Normal salivary gland tissue showed negative immunoreactivity for both Ki-67 and MCM-3 in epithelial and myoepithelial cells. All theexamined cases showed positive expression for both proliferative markers in benign and malignant SGTs, with different intensities.Conclusions: The proliferative markers Ki-67 and MCM-3 proteins are overexpressed in malignant salivary gland tumors, than benign ones.Both Ki-67 and MCM-3 may be reliably applied as diagnostic markers to distinguish benign from malignant salivary gland tumors.
Alexandria Dental Journal
Alexandria University; Faculty of Dentistry
1110-015X
40
v.
2
no.
2015
248
255
https://adjalexu.journals.ekb.eg/article_59161_e9f740f5fec8672236e2b8b97ab285ca.pdf
dx.doi.org/10.21608/adjalexu.2015.59161