多种植体支持修复体转移印模技术的应变片评估

Strain Gauge Evaluation of Transfer Impression Techniques of Multiple Implant-Supported Prosthesis.

作者信息

Nishioka Renato Sussumu, De Santis Leandro Ruivo, De Melo Nishioka Gabriela Nogueira, Kojima Alberto Noriyuki, Souza Francisley Ávila

机构信息

Professor, Department of Dental Materials and Prosthesis, São Paulo State University, ICT, UNESP, São José dos Campos, São Paulo, Brazil.

Researcher, Department of Dental Materials and Prosthesis, São Paulo State University, ICT, UNESP, São José dos Campos, São Paulo, Brazil.

出版信息

Implant Dent. 2018 Apr;27(2):188-192. doi: 10.1097/ID.0000000000000744.

DOI:10.1097/ID.0000000000000744

PMID:29533242

Abstract

PURPOSE

This in vitro study assessed the accuracy of multiple implant-level impression techniques (open tray and closed tray) for the fabrication of 3-unit implant prostheses with strain gauge (SG) analysis.

MATERIALS AND METHODS

A polyurethane master model was designed to simulate a clinical situation. Two rigid custom trays were fabricated for the model. The impression material used was polysulfide. Transfer implant impressions were made using 2 techniques; ten tapered copings not splinted (custom closed tray) and ten square copings splinted with acrylic-resin (custom open tray). The improved stone models were allowed to set for 1 hour before being separated from the impression. The superstructures were sprued, invested, and cast with a cobalt-chromium alloy. Four SGs were bonded on the surface of each polyurethane block.

RESULTS

A statistically significant difference was found between the 2 impression techniques tested (P = 0.000). This study found a significant average difference of 144.68 ± 5.53 με for open custom tray and 253.3 ± 16.7 με for closed custom tray.

CONCLUSION

The custom open tray technique was the most accurate impression for multiple implants compared with closed custom tray.

摘要

目的

本体外研究通过应变片（SG）分析评估了多种种植体水平印模技术（开放托盘和封闭托盘）用于制作3单位种植修复体的准确性。

材料与方法

设计一个聚氨酯主模型以模拟临床情况。为该模型制作了两个刚性定制托盘。使用的印模材料是聚硫化物。采用两种技术制取转移种植体印模；十个未用夹板固定的锥形桩帽（定制封闭托盘）和十个用丙烯酸树脂夹板固定的方形桩帽（定制开放托盘）。改良的石膏模型在与印模分离前放置1小时。对上部结构进行浇铸道设置、包埋，并使用钴铬合金铸造。在每个聚氨酯块的表面粘贴四个应变片。