RADIOGRAPHIC ASSESSMENT OF BONE LEVEL CHANGES AROUND FOUR IMPLANTS SUPPORTING IMMEDIATELY LOADED MANDIBULAR SCREW-RETAINED PROSTHESIS

Document Type : Original Article

Authors

1 Faculty of Dentistry , Damanhour University

2 Professor of Prosthodontics, Faculty of Dentistry, Alexandria University, Alexandria City, Egypt

3 Professor of Prosthodontics, Faculty of Dentistry, Alexandria University.

4 Assistant Professor, Oral Medicine and Periodontology, Faculty of Dentistry, Alexandria University, Alexandria City, Egypt

Abstract

ABSTRACT
Introduction Immediate restoration of the edentulous mandible with implant-supported fixed screw-retained restorations was extensively studied. When deciding to insert 4 implants to retain a fixed prosthesis; tilting the distal implants determines the anteroposterior distribution and, therefore, the distal cantilever span. The probability of distal implant tilting, however, is significantly affected by mandibular atrophy and the location of the mental foramen dictating the posterior implant axial positioning.
Objectives: Measuring the amount of marginal bone changes around immediately loaded two anterior axial implants and two subsequently tilted implants versus four axially installed implants that retain screw-retained restoration.
Materials and Methods: In the present research, fourteen edentulous patients were randomly allocated to 2 equal groups. For each participant four implants were installed with either an axial or with axial anterior and tilted posterior implant alignment. All participants received a fixed detachable metal acrylic definitive restoration after 3 months of loading. A baseline, 6 , and 12 month follow-up protocol was scheduled to assess marginal changes in bone levels using cone beam computed tomography.
Results: Over the follow-up duration of 1 year, none of the interim or definite prostheses were lost. The mean bone loss did not reach 2 mm after 1 year. There were no statistically significant differences between the two evaluated groups (P>.05) and the anterior and posterior implants (P>.8) in marginal bone loss.
Conclusion: For immediately loaded 4-implant supported mandibular restorations with distal cantilevers, comparable marginal bone level changes were obtained whether the posterior implants were tilted or not.

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Alexandria Dental Journal
Volume 47, Issue 2
B (Endodontics, Prosthodontics, Fixed prosthodontics, Conservative dentistry, Dental Biomaterials)
August 2022
Pages 113-120

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