JMIR Publications

ABSTRACT

Background:

The accurate transfer of implant positions from the patient's mouth to the laboratory is crucial for the successful fabrication of prostheses in implant-based prosthodontics. Making an implant impression is a crucial part of this procedure as it replicates the intraoral implant position and transfers it to the cast to be used in the laboratory for fabricating a passive fitting prosthesis. The purpose of this study is to compare and assess the accuracy of implant impressions made with prefabricated self-perforating trays and custom acrylic trays.

Objective:

The objective of this study is to evaluate the position of implants on master model, to evaluate accuracy of implant impressions made with custom acrylic tray, to evaluate accuracy of implant impressions made with Pre-fabricated self perforating tray and to compare accuracy of implant impression made with custom acrylic tray, Pre-fabricated self perforating tray and the master model.

Methods:

A partially edentulous mandibular model with implants placed at the 2nd premolar and 1st molar region will function as a master model. Impression will be made using the custom acrylic tray and prefabricated self-perforating implant impression tray. The cast obtained will be scanned, and an STL file will be generated to evaluate the accuracy of implant positions using Hyper Mesh software. Statistical analysis will be done with Statistical Package for Social Sciences at a 95% confidence interval and 80% power. An unpaired t-test will be applied to compare the parameters between groups.

Results:

At the end of the study, we expect no statistically significant difference in the accuracy of implant casts obtained using prefabricated self-perforating trays compared to those obtained using custom acrylic trays, with a P value greater than 0.05 (P > 0.05), indicating comparable accuracy between the two tray types.

Conclusions:

For the success of implant dentistry, the precise fit of the final prosthesis has become a necessity. Mismatched framework may overload the implant, endangering their durability. To achieve this precise fit of the implant framework, a precise definitive cast is necessary, which depends on several factors, one of them being the implant impression tray selection. Traditionally, custom acrylic trays have been in use. However, they are impractical to use in routine clinical practice due to certain disadvantages. A newer range of trays for the open tray impression technique is being marketed, and one would be able to reduce the additional expense and laboratory time associated with using custom acrylic trays by using this newer variety of self-perforating implant impression tray. Clinical Trial: Since this investigation will be conducted entirely as an in vitro study, registration with the Clinical Trials Registry - India (CTRI) was not applicable and therefore not required.