Student Theses, Dissertations and Capstones

Document Type

Thesis - NSU Access Only

Degree Name

Master of Science (M.S.) in Dentistry

Copyright Statement

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Department

College of Dental Medicine

First Advisor

Theofilos Koutouzis

Date of original Performance / Presentation

January 2021

Publication Date / Copyright Date

1-1-2021

Abstract

Introduction: For optimal dental implant esthetics, the transition of a circumferential implant platform to a proper cervical anatomy has been emphasized. This transition is facilitated by the macro-design of the transmucosal portion of the abutment-restoration complex at the provisional and final stages of implant prosthetic therapy. There is limited information from human studies assessing the impact of abutment macro-design on peri-implant tissue dimensional changes. Aim: The aim of this work was to evaluate the peri-implant tissue levels over a 3-year period for implants connected to either convex or concave final abutments at the time of implant placement. Methods: Twenty-eight patients with one missing maxillary premolar were randomly allocated to receive one single implant with abutments of different emergence shape configuration. Patients of the CX Group had abutments with convex emergence shape and patients of the CV Group had abutments with concave emergence shape. Clinical and radiographic data were collected at the time of implant placement (T0), final prosthesis delivery (T1), 12 months following implant placement (T2), and 36 months after implant placement (T3). Results: At a 3 year follow up, the mean sub-crestal implant position change was -0.69mm (0.48) in the CX group and -0.16mm (0.22) (p<0.05). Another statistical significance emerged for the peri-implant mesial marginal mucosa position of the two groups over time. Mean values were 0.63mm (SD:1.43mm) for the CX group and 1.69mm (0.85) for the CV group. No statistically significant difference was found in recession between the CX and CV groups at all time points. Conclusion: A concave abutment configuration was associated with less bone remodeling. However, no difference was seen in the amount of recession between the two groups.

Disciplines

Dentistry

Keywords

Abutment; Concave; Convex; Design; Implant; Mucosa

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