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

Wan Sun Lee, Woong Chul Kim, Hae-Young Kim, Wook Tae Kim, Ji Hwan Kim

Research output: Contribution to journalArticle

11 Citations (Scopus)

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 (a=0.05), repeated measures ANOVA and twoway ANOVA (a=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 μm).

Original languageEnglish
Pages (from-to)22-29
Number of pages8
JournalJournal of Advanced Prosthodontics
Volume6
Issue number1
DOIs
Publication statusPublished - 2014 Feb 1

Fingerprint

Tooth
Lasers
Denmark
Analysis of Variance
Epoxy Resins
Fixed Partial Denture
Computer-Aided Design
Silicone Elastomers
Bicuspid
Silicones
Korea
Students
Equipment and Supplies
zirconium oxide
Seoul
vinyl polysiloxane

Keywords

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

ASJC Scopus subject areas

  • Dentistry (miscellaneous)
  • Oral Surgery

Cite this

Evaluation of different approaches for using a laser scanner in digitization of dental impressions. / Lee, Wan Sun; Kim, Woong Chul; Kim, Hae-Young; Kim, Wook Tae; Kim, Ji Hwan.

In: Journal of Advanced Prosthodontics, Vol. 6, No. 1, 01.02.2014, p. 22-29.

Research output: Contribution to journalArticle

Lee, Wan Sun ; Kim, Woong Chul ; Kim, Hae-Young ; Kim, Wook Tae ; Kim, Ji Hwan. / Evaluation of different approaches for using a laser scanner in digitization of dental impressions. In: Journal of Advanced Prosthodontics. 2014 ; Vol. 6, No. 1. pp. 22-29.
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