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Qualitative computer aided evaluation of dental impressions in vivo.
Dent Mater. 2006 Jan; 22(1):69-76.DM

Abstract

OBJECTIVES

Clinical investigations dealing with the precision of different impression techniques are rare. Objective of the present study was to develop and evaluate a procedure for the qualitative analysis of the three-dimensional impression precision based on an established in-vitro procedure. The zero hypothesis to be tested was that the precision of impressions does not differ depending on the impression technique used (single-step, monophase and two-step-techniques) and on clinical variables.

METHODS

Digital surface data of patient's teeth prepared for crowns were gathered from standardized manufactured master casts after impressions with three different techniques were taken in a randomized order. Data-sets were analyzed for each patient in comparison with the one-step impression chosen as the reference. The qualitative analysis was limited to data-points within the 99.5%-range. Based on the color-coded representation areas with maximum deviations were determined (preparation margin and the mantle and occlusal surface). To qualitatively analyze the precision of the impression techniques, the hypothesis was tested in linear models for repeated measures factors (p < 0.05).

RESULTS

For the positive 99.5% deviations no variables with significant influence were determined in the statistical analysis. In contrast, the impression technique and the position of the preparation margin significantly influenced the negative 99.5% deviations.

SIGNIFICANCE

The influence of clinical parameter on the deviations between impression techniques can be determined reliably using the 99.5 percentile of the deviations. An analysis regarding the areas with maximum deviations showed high clinical relevance. The preparation margin was pointed out as the weak spot of impression taking.

Authors+Show Affiliations

Luthardt RG
Department of Prosthetic Dentistry, Dresden University of Technology, University Hospital Carl Gustav Carus, Dental School, Fetscherstrasse 74, 01307 Dresden, Germany. ralph.luthardt@uniklinikum-dresden.de
Koch R
No affiliation info available
Rudolph H
No affiliation info available
Walter MH
No affiliation info available

MeSH

Computer-Aided DesignCrownsDental Impression TechniqueHumansImage Processing, Computer-AssistedImaging, Three-DimensionalModels, DentalReproducibility of ResultsSurface PropertiesToothTooth Preparation, Prosthodontic

Pub Type(s)

Comparative Study
Journal Article
Randomized Controlled Trial
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

16040117

Citation

Luthardt, Ralph G., et al. "Qualitative Computer Aided Evaluation of Dental Impressions in Vivo." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 22, no. 1, 2006, pp. 69-76.
Luthardt RG, Koch R, Rudolph H, et al. Qualitative computer aided evaluation of dental impressions in vivo. Dent Mater. 2006;22(1):69-76.
Luthardt, R. G., Koch, R., Rudolph, H., & Walter, M. H. (2006). Qualitative computer aided evaluation of dental impressions in vivo. Dental Materials : Official Publication of the Academy of Dental Materials, 22(1), 69-76.
Luthardt RG, et al. Qualitative Computer Aided Evaluation of Dental Impressions in Vivo. Dent Mater. 2006;22(1):69-76. PubMed PMID: 16040117.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Qualitative computer aided evaluation of dental impressions in vivo. AU - Luthardt,Ralph G, AU - Koch,Rainer, AU - Rudolph,Heike, AU - Walter,Michael H, Y1 - 2005/07/22/ PY - 2004/05/13/received PY - 2004/12/14/revised PY - 2005/02/08/accepted PY - 2005/7/26/pubmed PY - 2006/3/24/medline PY - 2005/7/26/entrez SP - 69 EP - 76 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 22 IS - 1 N2 - OBJECTIVES: Clinical investigations dealing with the precision of different impression techniques are rare. Objective of the present study was to develop and evaluate a procedure for the qualitative analysis of the three-dimensional impression precision based on an established in-vitro procedure. The zero hypothesis to be tested was that the precision of impressions does not differ depending on the impression technique used (single-step, monophase and two-step-techniques) and on clinical variables. METHODS: Digital surface data of patient's teeth prepared for crowns were gathered from standardized manufactured master casts after impressions with three different techniques were taken in a randomized order. Data-sets were analyzed for each patient in comparison with the one-step impression chosen as the reference. The qualitative analysis was limited to data-points within the 99.5%-range. Based on the color-coded representation areas with maximum deviations were determined (preparation margin and the mantle and occlusal surface). To qualitatively analyze the precision of the impression techniques, the hypothesis was tested in linear models for repeated measures factors (p < 0.05). RESULTS: For the positive 99.5% deviations no variables with significant influence were determined in the statistical analysis. In contrast, the impression technique and the position of the preparation margin significantly influenced the negative 99.5% deviations. SIGNIFICANCE: The influence of clinical parameter on the deviations between impression techniques can be determined reliably using the 99.5 percentile of the deviations. An analysis regarding the areas with maximum deviations showed high clinical relevance. The preparation margin was pointed out as the weak spot of impression taking. SN - 0109-5641 UR - https://www.unboundmedicine.com/medline/citation/16040117/Qualitative_computer_aided_evaluation_of_dental_impressions_in_vivo_ DB - PRIME DP - Unbound Medicine ER -