All ETDs from UAB

Advisory Committee Chair

Nicolaas Geurs

Advisory Committee Members

Ramzi Abou Arraj

Maria Geisinger

Amjad Javed

Augusto Robles

Document Type


Date of Award


Degree Name by School

Master of Dentistry (MDent) School of Dentistry


Aim: To assess the performance of microtextured dental implants with or without a machined collar at one year after placement. Material and Methods: Fifty-eight patients received dental implant therapy to restore missing teeth in one area of the maxilla or man-dible at the UAB Department of Graduate Periodontology. Residents in the program placed microtextured implants with a microtextured collar with microgrooves (test group) and microtextured implants with a machined collar (control group). Sites were randomized to the test group or control group. Study visit protocol was followed and implants were restored by off-site dentists. Sixty-nine (69) implants were assessed at one year for a final study visit. The primary outcome was to determine the difference between crestal bone levels in the test versus the control group implants as measured by differences in radiographic crestal bone heights at baseline and one year. Data collected consisted of periapical radiographs and clinical photographs that were taken at specific time points throughout the study period. Statistical analyses using individual t-tests and ANOVA were performed to analyze the data. Results: Statistical analysis determined that a significant difference in marginal bone loss was present between the roughened collar (0.65±0.43) and machined collar (1.20±0.62) MTX implants at one year (p<0.0001). The mean differences of bone loss were (0.35±0.56) and (0.82±0.70), respectively (p=0.0039). Secondary analysis assessed implant survival, site-specific differences, patient-related factors, and esthetic considerations. The only significant secondary variable found associated with marginal bone loss was implant diameter (p=0.0194). This study also assessed implant placement by novice surgeons to determine if implant design characteristics had an affect. Conclusion: Microtextured implants with a roughened collar with microgrooves had less crestal bone loss at one year than ones with a machined collar. More studies with larger sample sizes should be performed to determine the significance of other local and systemic factors on MTX implants and crestal bone loss.

Included in

Dentistry Commons



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