Semester

Spring

Date of Graduation

2021

Document Type

Thesis

Degree Type

MS

College

School of Dentistry

Department

Restorative Dentistry

Committee Chair

Matthew T. Harper

Committee Co-Chair

Matthew S. Bryington

Committee Member

Shelby Alexander

Committee Member

Bryan Weaver

Abstract

Introduction: Implants placed at variable depths may vary the amount of visible scannable surface of a scan body. Intraoral scanner technology uses advanced optical principles to record the surface of the scan body to accurately capture the implant position.

Purpose: To investigate the effect implant placement depth has on the accuracy of digital implant impressions using an intraoral scanner.

Materials & Methods: A partially edentulous gypsum master model was fabricated to allow the positioning of a single implant analog at different depths. Four groups based on the planned implant depths of 0, 3, 6 and 7mm and corresponding visibility of the scan body at 9, 6, 3 and 2mm were created. The model was digitized with a laboratory scanner for the reference scan and with an intraoral scanner to generate 15 test scans per group. The test scans were superimposed onto the reference scan using the best fit algorithm to analyze and measure the positional (dXYZ) and angular deviation (d⍬) of the scan body using 3D metrology software. Statistical analysis was performed using a One way ANOVA and pairwise comparison was done with a Tukey-Kramer HSD test. (α= .05)

Results:The one-way analysis of variance of the groups for the dXYZ and d⍬ parameters was statistically significant (P

Conclusions: The accuracy of digital impressions is influenced by the implant depth and the amount of visibility of the scan body. The trueness and precision of the digital impressions are highest when the implant is placed at 0mm depth with complete visibility of the scan body and decreases with subgingival implant placement.

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