J Adv Prosthodont.  2014 Feb;6(1):22-29. 10.4047/jap.2014.6.1.22.

Evaluation of different approaches for using a laser scanner in digitization of dental impressions

Affiliations
  • 1Department of Health Science, Graduate School, Korea University, Seoul, Republic of Korea.
  • 2Department of Dental Laboratory Science and Engineering, College of Health Science, Korea University, Seoul, Republic of Korea. kjh2804@korea.ac.kr
  • 3Department of Public Health Science, Graduate School & BK21+ Program in Public Health Science, Korea University, Seoul, Republic of Korea.
  • 4Department of Dental Laboratory, Sinheung University, Uijeongbu, Republic of Korea.

Abstract

PURPOSE
This study aimed to investigate the potential clinical application of digitized silicone rubber impressions by comparing the accuracy of zirconia 3-unit fixed partial dentures (FPDs) fabricated from 2 types of data (working model and impression) obtained from a laser scanner.
MATERIALS AND METHODS
Ten working models and impressions were prepared with epoxy resin and vinyl polysiloxane, respectively. Based on the data obtained from the laser scanner (D-700; 3Shape A/S, Copenhagen, Denmark), a total of 20 zirconia frameworks were prepared using a dental CAD/CAM system (DentalDesigner; 3shape A/S, Copenhagen, Denmark / Ener-mill, Dentaim, Seoul, Korea). The silicone replicas were sectioned into four pieces to evaluate the framework fit. The replicas were imaged using a digital microscope, and the fit of the reference points (P1, P2, P3, P4, P5, P6, and P7) were measured using the program in the device. Measured discrepancies were divided into 5 categories of gaps (MG, CG, AWG, AOTG, OG). Data were analyzed with Student's t-test (alpha=0.05), repeated measures ANOVA and two-way ANOVA (alpha=0.05).
RESULTS
The mean gap of the zirconia framework prepared from the working models presented a narrower discrepancy than the frameworks fabricated from the impression bodies. The mean of the total gap in premolars (P=.003) and molars (P=.002) exhibited a statistical difference between two groups.
CONCLUSION
The mean gap dimensions of each category showed statistically significant difference. Nonetheless, the digitized impression bodies obtained with a laser scanner were applicable to clinical settings, considering the clinically acceptable marginal fit (120 microm).

Keyword

Digitization of impression bodies; Dental CAD/CAM system; Zirconia three-unit FPDs; Marginal gap; Internal gap

MeSH Terms

Bicuspid
Denmark
Denture, Partial, Fixed
Molar
Seoul
Silicone Elastomers
Siloxanes
Silicone Elastomers
Siloxanes
Full Text Links
  • JAP
Actions
Cited
CITED
export Copy
Close
Share
  • Twitter
  • Facebook
Similar articles
Copyright © 2022 by Korean Association of Medical Journal Editors. All rights reserved.     E-mail: koreamed@kamje.or.kr