Emtair, E., Bakry, S., Azer, A. (2015). THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS. Alexandria Dental Journal, 40(2), 214-220. doi: 10.21608/adjalexu.2015.59155
E.M Emtair; S Bakry; A.S Azer. "THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS". Alexandria Dental Journal, 40, 2, 2015, 214-220. doi: 10.21608/adjalexu.2015.59155
Emtair, E., Bakry, S., Azer, A. (2015). 'THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS', Alexandria Dental Journal, 40(2), pp. 214-220. doi: 10.21608/adjalexu.2015.59155
Emtair, E., Bakry, S., Azer, A. THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS. Alexandria Dental Journal, 2015; 40(2): 214-220. doi: 10.21608/adjalexu.2015.59155
THE EFFECT OF TOOTH PREPARATION TAPER ON THE MARGINAL FIT AND FRACTURE RESISTANCE OF CAD/CAM ZIRCONIA COPINGS
B.D.S. Faculty of Dentistry Sirte University of science and technology
Abstract
Introduction: Clinical fracture resistance and marginal fit are regarded as major outcomes when considering the performance of all -ceramic crown. 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 ceramic copings. Materials and methods: A machined standard stainless steel dies representing lower first molar were made and fixed to a metal base to stimulate single prepared crowns with three different axial wall convergence angles (6°, 12°, 22°). Master dies were duplicated using silicon mold after which fifteen crowns were reproduced for each group using epoxy resin material. All cores were fabricated using cercon zirconia and adhesively luted on epoxy resin dies. Measurement of marginal fit was performed with cone beam computed tomography. Specimens were subjected to fracture resistance 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 fit also 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 their marginal fit and increased their fracture strength.
1. Aboushelib MN, de Jager N, Kleverlaan CJ, Feilzer AJ. Effect of loading method on the fracture mechanics of two layered all-ceramic restorative systems. Dent Mater 2007; 23: 952-9.
2. Heidari B, Ardakani ZH. Evaluation the Effect of Change in Convergence Angle of Tooth Preparation and Copping Thickness on Fracture Resistance of All Ceramic Crowns. J Mash Dent 2012; 36: 183-90.
3. Reich S, Wichmann M, Nkenke E, Proeschel P. Clinical fit of all-ceramic three-unit fixed partial dentures, generated with three different CAD/CAM systems. Eur J Oral Sci. 2005; 113: 174-9.
4. Felton DA, Kanoy BE, Bayne SC, Wirthman GP. Effect of in vivo crown margin discrepancies on periodontal health. J Prosthet Dent. 1991; 65: 357-64.
5. Knoernschild KL, Campbell SD. Periodontal tissue responses after insertion of artificial crowns and fixed partial dentures. J Prosthet Dent. 2000; 84: 492-8.
6. Jalalian E, Atashkar B, Rostami R. The Effect of Preparation Design on the Fracture Resistance of Zirconia Crown Copings (Computer Associated Design/Computer Associated Machine, CAD/CAM System). J Dent (Tehran) 2011; 8: 123-9.
7. Burke FJ, Watts DC. Fracture resistance of teeth restored with dentin bonded crowns. Quintessence Int 1994; 25: 335-40.
8. Cormier CJ, Burns DR, Moon P. In vitro comparison of the fracture resistance and failure mode of fiber, ceramic and conventional post systems at various stages of restoration. J Prosthodont 2001; 10: 26-36.
9. Rosentritt M, Behr M, Gebhard R, Handel G. Influence of stress simulation parameters on the fracture strength of all-ceramic fixed-partial dentures. Dent Mater. 2006; 22: 176-82.
10. Kelly JR. Clinically relevant approach to failure testing of all-ceramic restorations. J Prosthet Dent. 1999 Jun;81(6):652-61.
11. Tylman SD. Theory and practice of prostho-dontics. 7th ed. ST Louis: CV Mosby, 1978.
12. Mack PJ. A theoretical and clinical investtigation into the taper achieved on crown and inlay preparations. J Oral Rehabil. 1980; 7: 255-65.
13. Poon BK, Smales RJ. Assessment of clinical preparations for single gold and ceramometal crowns. Quintessence Int. 2001; 32: 603-10.
14. Smith CT, Gary JJ, Conkin JE, Franks HL. Effective taper criterion for the full veneer crown preparation in preclinical prosthodontics. J Prosthodont. 1999; 8: 196- 200.
15. Shillinburg HT, Hobo S, Whitsett LD, Jacobi R, Brackett SE. Fundamental of fixed prosthodontics. 3rd ed. Carol Stream: Quintessence Publishing Co; Inc, 1997.
16. Koutayas SO, Kern M, Ferraresso F, Strub JR. Influence of design and mode of loading on the fracture strength of all-ceramic resin-bonded fixed partial dentures: an in vitro study in a dual-axis chewing simulator. J Prosthet Dent. 2000; 83: 540-7.
17. Kelly JR. Dental ceramics: current thinking and trends. Dent Clin North Am. 2004; 48: viii, 513-30.
18. Wang H, Aboushelib MN, Feilzer AJ. Strength influencing variables on CAD/CAM zirconia frameworks. Dent Mater. 2008; 24: 633-8.
19. Lehmann F, Eickemeyer G, Rammelsberg P. Fracture resistance of metal-free composite crowns-effects of fiber reinforcement, thermal cycling, and cementation technique. J Prosthet Dent. 2004; 92: 258-64.
20. Salaverry A, Borges GA, Mota EG, Burnett Júnior LH, Spohr AM. Effect of resin cements and aging on cuspal deflection and fracture resistance of teeth restored with composite resin inlays. J Adhes Dent. 2013; 15: 561-8.
21. Sukovic P. Cone beam computed tomography in craniofacial imaging. Orthod Craniofac Res. 2003; 6(Suppl 1): 31–6.
22. Komine F, Iwai T, Kobayashi K, Matsumura H. Marginal and internal adaptation of zirconium dioxide ceramic copings and crowns with different finish line designs. Dent Mater J. 2007; 26: 659-64.
23. Beschnidt SM, Strub JR. Evaluation of the marginal accuracy of different all-ceramic crown systems after simulation in the artificial mouth. J Oral Rehabil. 1999; 26: 582-93.
24. McLean JW, von Fraunhofer JA. The estimation of cement film thickness by an in vivo technique. Br Dent J. 1971; 131: 107-11.
25. Beuer F, Aggstaller H, Richter J, Edelhoff D, Gernet W. Influence of preparation angle on marginal and internal fit of CAD/CAM-fabricated zirconia crown copings. Quintessence Int. 2009; 40: 243-50.
26. Da-wei G, Bao-wei Z, Yan G, Young-Jian L. Influence of different convergence angles of prepared teeth on the marginal accuracy and fracture strength of allceramic crowns. Chin J Prosthodont. 2006; 1: 9.
27. Cho L, Song H, Koak J, Heo S. Marginal accuracy and fracture strength of ceromer/fiber-reinforced composite crowns: effect of variations in preparation design. J Prosthet Dent. 2002; 88: 388-95.
28. Soares CJ, Martins LR, Pfeifer JM, Giannini M. Fracture resistance of teeth restored with indirectcomposite and ceramic inlay systems. Quintessence Int. 2004; 35:281-6.
29. Hammad M, Qualtrough A, Silikas N. Effect of new obturating materials on vertical root fracture resistance of endodontically treated teeth. J Endod. 2007; 33: 732-6.
30. Lertchirakarn V, Palamara JE, Messer HH. Patterns of vertical root fracture: factors affecting stress distribution in the root canal. J Endod. 2003; 29: 523-8.
31. Gerami-Panah F, Jalali H, Sedighpour L. Effect of Abutment Taper on the Fracture Resistance of allCeramic Three-unit Bridges. J Dent (Tehran). 2005; 2: 159-67.
32. Dong JK, Oh SC, Kim SD. Fracture strength of the IPS Empress crown: the effect of occlusal depth and axial inclination on upper first premolar crowns. J Kor Acad Prosthodont. 1999; 37: 127-33.
33. Mohamed SA, Hamdy IS, El-Guindy JF. Fracture resistance of milled zirconium oxide crown copings with two different occlusal taper. 2012; 58: 1.
34. Corazza PH, Feitosa SA, Borges AL, Della Bona A. Influence of convergence angle of tooth preparation on the fracture resistance of Y-TZP-based all-ceramic restorations. Dent Mater 2013; 29: 339-47.
35. Li-ping L, Yue-zhao M. Effect of different convergence angles of abutment axial surface on the fracture resistance of GI-II all-ceramic corwns. Chin J Prosthodont. 2008; 1: 5.
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