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Accuracy of implant impressions without impression copings: a three-dimensional analysis

Authors
 Joo-Hyun Kwon  ;  Yong-Ha Son  ;  Chong-Hyun Han  ;  Sunjai Kim 
Citation
 JOURNAL OF PROSTHETIC DENTISTRY, Vol.105(6) : 367-373, 2011 
Journal Title
JOURNAL OF PROSTHETIC DENTISTRY
ISSN
 0022-3913 
Issue Date
2011
MeSH
Cementation ; Dental Impression Technique/instrumentation* ; Dental Models ; Dental Prosthesis Retention/methods ; Dental Prosthesis, Implant-Supported* ; Imaging, Three-Dimensional ; Maxilla ; LinkOut
Abstract
STATEMENT OF PROBLEM: Implant impressions without impression copings can be used for cement-retained implant restorations. A comparison of the accuracy of implant impressions with and without impression copings is needed.

PURPOSE: The purpose of this study was to evaluate and compare the dimensional accuracy of implant definitive casts that are fabricated by implant impressions with and without impression copings.

MATERIAL AND METHODS: An acrylic resin maxillary model was fabricated, and 3 implant replicas were secured in the right second premolar, first, and second molars. Two impression techniques were used to fabricate definitive casts (n=10). For the coping group (Group C), open tray impression copings were used for the final impressions. For the no-coping group (Group NC), cementable abutments were connected to the implant replicas, and final impressions were made assuming the abutments were prepared teeth. Computerized calculation of the centroids and long axes of the implant or stone abutment replicas was performed. The Mann-Whitney U test analyzed the amount of linear and rotational distortion between groups (α =.05).

RESULTS: At the first molar site, Group NC showed significantly greater linear distortion along the Y-axis, with a small difference between the groups (Group C, 7.8 ± 7.4 μm; Group NC, 19.5 ± 12.2). At the second molar site, increased distortion was noted in Group NC for every linear and rotational variable, except for linear distortion along the Z-axis.

CONCLUSIONS: Implant impression with open tray impression copings produced more accurate definitive casts than those fabricated without impression copings, especially those with greater inter-abutment distance.
Full Text
http://www.sciencedirect.com/science/article/pii/S0022391311600759
DOI
10.1016/S0022-3913(11)60075-9
Appears in Collections:
2. College of Dentistry (치과대학) > Dept. of Prosthodontics (보철과학교실) > 1. Journal Papers
Yonsei Authors
Kwon, Joo Hyun(권주현)
Kim, Sun Jai(김선재) ORCID logo https://orcid.org/0000-0002-0828-8008
Son, Yong Ha(손용하)
Han, Jong Hyoun(한종현)
URI
https://ir.ymlib.yonsei.ac.kr/handle/22282913/95181
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