通过三维光学扫描评估印模 coping 设计、印模技术和牙体倒凹对种植体印模准确性的影响：一项体外研究。

Effects of Impression Coping Design, Impression Technique, and Dental Undercuts on the Accuracy of Implant Impressions Assessed by 3-Dimensional Optical Scanning: An In Vitro Study.

作者信息

Sabouhi Mahmoud, Bajoghli Farshad, Dakhilalian Mansour, Beygi Ali, Abolhasani Majid

机构信息

*Assistant Professor, Dental Materials Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. †Associate Professor, Dental Implants Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. ‡Assistant Professor, Dental Implants Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran. §Postgraduate Student, Dental Students Research Center, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.

出版信息

Implant Dent. 2016 Apr;25(2):238-46. doi: 10.1097/ID.0000000000000389.

DOI:10.1097/ID.0000000000000389

PMID:26914543

Abstract

INTRODUCTION

The aim of this in vitro study was to evaluate the effect of the type and design of the impression copings on the accuracy of implant impressions in 2 different conditions.

MATERIALS AND METHODS

A reference model with 2 implants inserted in bilateral mandibular canines was fabricated. The posterior teeth were inserted as tilted to simulate intra-oral undercuts. The teeth were eliminated to create an edentulous condition. Three different impression techniques were performed (open high retentive [OH], open low retentive [OL], closed [C]) for each condition. Total of 48 casts were made. Two scan-bodies were secured on each cast, scanned by an optical scanner. Then, they were compared to the scan of the reference model, and the calculated mean errors were analyzed with a 2-way ANOVA and Tukey test.

RESULTS

There was no significant difference between the complete and partially edentulous groups (F = 3.252, P = 0.079). There was significant difference between the different designs of the impression copings (F = 31.789, P < 0.001) but the interaction between the dependent variables was not significant (F = 0.511, P = 0.603).

CONCLUSIONS

The design of the impression copings was more important than the undercuts. The accuracy of the closed tray coping was greater than the low retentive coping and equal to the high retentive coping.

摘要

引言

本体外研究的目的是评估印模帽的类型和设计在两种不同条件下对种植体印模准确性的影响。

材料与方法

制作一个双侧下颌尖牙植入两颗种植体的参考模型。将后牙倾斜插入以模拟口腔内倒凹。去除牙齿以形成无牙状态。每种条件下采用三种不同的印模技术（开放式高固位[OH]、开放式低固位[OL]、封闭式[C]）。共制作了48个模型。在每个模型上固定两个扫描体，用光学扫描仪进行扫描。然后，将它们与参考模型的扫描结果进行比较，计算出的平均误差采用双向方差分析和Tukey检验进行分析。