Faculty Collaboration Database

Three-dimensional fit of lithium disilicate partial crowns in vitro. J Dent 2013 Mar;41(3):271-7

Date

12/12/2012

Pubmed ID

23228498

DOI

10.1016/j.jdent.2012.11.014

Scopus ID

2-s2.0-84875218263 (requires institutional sign-in at Scopus site)   25 Citations

Abstract

OBJECTIVES: A novel three-dimensional scanning technique was used to investigate the effects a one-step and a two-step impression methods can have on the three-dimensional fit of ceramic partial crowns.

METHODS: An acrylic model of a mandibular first molar was prepared to receive a partial coverage all-ceramic crown (mesio-occlusal-distal inlay preparation with reduction of all cusps and rounded shoulder finish line of buccal wall). Type IV plaster replicates were cast based on one-step single viscosity (OS/SV), one-step dual viscosity (OS/DV), and two-step dual viscosity (TS/DV) impressions. Five partial crowns were fabricated per impression method using hot-pressed lithium disilicate ceramics. Then, preparation and restorations were digitized using a non-contact, white-light scanner featuring self-calibrating optics (overall measurement uncertainty of <5μm). Data were entered into quality inspection software which superimposed the records (best-fit-algorithm), calculated fit-discrepancies for every pixel, and colour-coded the results to aid visualization. Furthermore, mean quadratic deviations (RMS) were computed and analyzed statistically with a 1-way ANOVA. Scheffé's procedure was applied for multiple comparisons (α=0.05).

RESULTS: Mean RMS-values for marginal (internal) surfaces were: OS/SV 70 (20)μm, OS/DV 78 (34)μm, and TS/DV 107 (52)μm. Differences among impression techniques were statistically significant at p=0.006 (0.001). Qualitatively, occlusal ridges and preparation finish lines were over contoured, whereas inner occlusal boxes and the proximal-occlusal isthmus were under contoured.

CONCLUSIONS: OS/SV and OS/DV impressions resulted in statistically significantly smaller marginal and internal discrepancies than the two-step technique.

CLINICAL SIGNIFICANCE: Marginal and internal fit of hot-pressed lithium disilicate partial crowns depended on the employed impression technique. One-step impressions are preferred over two-step techniques in many day-to-day clinical situations, especially for the fabrication of partial coverage crown restorations.

Author List

Schaefer O, Kuepper H, Sigusch BW, Thompson GA, Hefti AF, Guentsch A

Authors

Arndt Geuntsch in the CTSI department at Medical College of Wisconsin - CTSI
Arthur Hefti DDS,PhD Associate Dean - Research & Graduate Studies in the Dentistry department at Marquette University

MESH terms used to index this publication - Major topics in bold

Analysis of Variance
Computer-Aided Design
Crowns
Dental Impression Technique
Dental Marginal Adaptation
Dental Porcelain
Dental Prosthesis Design
Humans
Imaging, Three-Dimensional
Prosthesis Fitting
Statistics, Nonparametric
Tooth Preparation, Prosthodontic
Viscosity