Marginal Peri-implant Bone Loss Associated with Two Implant Macrostructures- a Prospective Simmetrical Split Mouth Study
Author | : Alessandro Luigi Rossi |
Publisher | : |
Total Pages | : |
Release | : 2017 |
ISBN-10 | : OCLC:1163833917 |
ISBN-13 | : |
Rating | : 4/5 (17 Downloads) |
Book excerpt: Background and Aim: Stable peri-implant bone levels are unanimously considered a fundamental premise to achieve success in implant dentistry. Heterogenous results were published with respect to the influence of a conical versus straight implant collars design on marginal peri-implant bone loss (MBL). The first observations on conical implants with a machined neck reported higher values of MBL compared to straight implant fixtures. However, further investigations reported controversial outcomes, supporting no difference in MBL between conical and straight implant collars on one hand, and significant differences on the other.u2028The purpose of this randomized split-mouth clinical trial was to assess whether two implant fixtures with identical surfaces, prosthetic connections, coronal diameters and lengths, exhibit any significant difference in: a. MBL; b. implant success and survival rates; c. peri-implant probing depth (PD) and bleeding on probing (BOP), after a 3 year follow-up period. Methods and Materials: Ten patients presenting with single tooth symmetric posterior edentulous spaces, received a straight collar implant in one site (OsseoSpeed TX 5.0 S Astra Tech Implant System), and a conical collar implant in the symmetric contralateral one (OsseoSpeed TX 5.0, Astra Tech Implant System). All edentulous sites did not require bone regeneration in order to place 5mm implants with a minimum length of 9mm, as the inclusion criteria required a minimum residual bone height of 12mm and a minimum residual bone width of 7mm per site. All patients received implants with matching lengths in the two symmetric sites. Patients were followed-up for 36 months to evaluate: a) MBL; b) implant survival and success rates according to Albrektsson et al. criteria (1986); c) peri-implant probing depth (PD) and bleeding on probing (BOP).Results: All patients were evaluated at their last recall with a clinical evaluation and a periapical radiograph, standardized through the customization of a Rinnu2019s film holder. No implant failed to osseointegrate or required to be removed. All patients maintained adequate plaque and bleeding on probing indexes during the follow-up period. The evaluation conducted on the periapical radiographs through an image processing and analysis software (Image Ju00ae) revealed a marginal peri-implant bone loss ranged from 0 to 0.5 mm in 80% of cases and from 0.5 to 1 mm in 15%. In a single implant (control group), a 1.9 mm vertical bone resorption was observed. Thus, the survival and success rates according to Albrektsson et al. criteria were 100% and 95%, in the test and control group, respectively. No significant differences were observed between the two sites, with respect to MBL, peri-implant probing depth (PD) and bleeding on probing (BOP).Conclusions: Despite the short follow-up period and the limited external validity of our results, this study suggest that large diameter implants with a straight or conical implant collar macrostructure are equally reliable in the rehabilitation of single tooth posterior edentulous spaces.