Tags

Type your tag names separated by a space and hit enter

Computer aided analysis of digitized dental stone replicas by dental CAD/CAM technology.
Dent Mater. 2008 Aug; 24(8):1123-30.DM

Abstract

OBJECTIVES

To determine the reproducibility of digitized dental stone replicas compared to the master model and the reliability of the computer aided analysis.

METHODS

Four master dies, prepared for complete crowns were fabricated in presintered yttria-stabilized tetragonal zirconia (Y-TZP). Eight vinyl polysiloxane impressions (PROVIL novo; Heraeus Kulzer) were taken of each die and stone replicas were poured in type IV stone (Vel-Mix Stone; Kerr). The master dies and the stone replicas were digitized in a touch-probe scanner (Procera Forte; Nobel Biocare AB), to create triangulated surface-models. The point-cloud from the first of the repeated digitizations of each master die was used as CAD-reference-models (CRM). Discrepancies between the points in the triangulated surface-models and the corresponding CRM were measured by a matching-software (CopyCAD 6.504 SP2; Delcam Plc). The distribution of the discrepancies was analyzed and presented in color-difference-maps.

RESULTS

The precision of the measuring method, presented as the repeatability coefficient, ranged between 7 and 16 microm (entire surface), whereas the analysis of the stone replicas revealed a precision (repeatability coefficient) ranging from 19 to 26 microm. The accuracy of the replica to master (the mean discrepancy) ranged from 0.5 to 2.0 microm (95% confidence interval 1.5-2.9 microm).

SIGNIFICANCE

The greatest precision of the measurement was seen in the jacket surface of the die. The size of the stone replicas varied and the repeatability coefficient was on average 15 microm (2-25 microm) greater for the replica-to-master alignment than the repeated digitizations of the master.

Links

Publisher Full Text (DOI)

Authors+Show Affiliations

Persson AS
Institute of Odontology, Karolinska Institutet, Huddinge, Sweden.
Andersson M
No affiliation info available
Odén A
No affiliation info available
Sandborgh-Englund G
No affiliation info available

MeSH

BicuspidCalcium SulfateComputer-Aided DesignCrownsCuspidDental Impression MaterialsDental PorcelainDental Prosthesis DesignHumansImage Processing, Computer-AssistedIncisorModels, DentalMolarPolyvinylsReproducibility of ResultsSiloxanesSoftwareSurface PropertiesYttriumZirconium

Pub Type(s)

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

Language

eng

PubMed ID

18336900

Citation

Persson, Anna S K., et al. "Computer Aided Analysis of Digitized Dental Stone Replicas By Dental CAD/CAM Technology." Dental Materials : Official Publication of the Academy of Dental Materials, vol. 24, no. 8, 2008, pp. 1123-30.
Persson AS, Andersson M, Odén A, et al. Computer aided analysis of digitized dental stone replicas by dental CAD/CAM technology. Dent Mater. 2008;24(8):1123-30.
Persson, A. S., Andersson, M., Odén, A., & Sandborgh-Englund, G. (2008). Computer aided analysis of digitized dental stone replicas by dental CAD/CAM technology. Dental Materials : Official Publication of the Academy of Dental Materials, 24(8), 1123-30. https://doi.org/10.1016/j.dental.2008.01.008
Persson AS, et al. Computer Aided Analysis of Digitized Dental Stone Replicas By Dental CAD/CAM Technology. Dent Mater. 2008;24(8):1123-30. PubMed PMID: 18336900.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Computer aided analysis of digitized dental stone replicas by dental CAD/CAM technology. AU - Persson,Anna S K, AU - Andersson,Matts, AU - Odén,Agneta, AU - Sandborgh-Englund,Gunilla, Y1 - 2008/03/11/ PY - 2007/04/11/received PY - 2007/12/28/revised PY - 2008/01/07/accepted PY - 2008/3/14/pubmed PY - 2008/11/19/medline PY - 2008/3/14/entrez SP - 1123 EP - 30 JF - Dental materials : official publication of the Academy of Dental Materials JO - Dent Mater VL - 24 IS - 8 N2 - OBJECTIVES: To determine the reproducibility of digitized dental stone replicas compared to the master model and the reliability of the computer aided analysis. METHODS: Four master dies, prepared for complete crowns were fabricated in presintered yttria-stabilized tetragonal zirconia (Y-TZP). Eight vinyl polysiloxane impressions (PROVIL novo; Heraeus Kulzer) were taken of each die and stone replicas were poured in type IV stone (Vel-Mix Stone; Kerr). The master dies and the stone replicas were digitized in a touch-probe scanner (Procera Forte; Nobel Biocare AB), to create triangulated surface-models. The point-cloud from the first of the repeated digitizations of each master die was used as CAD-reference-models (CRM). Discrepancies between the points in the triangulated surface-models and the corresponding CRM were measured by a matching-software (CopyCAD 6.504 SP2; Delcam Plc). The distribution of the discrepancies was analyzed and presented in color-difference-maps. RESULTS: The precision of the measuring method, presented as the repeatability coefficient, ranged between 7 and 16 microm (entire surface), whereas the analysis of the stone replicas revealed a precision (repeatability coefficient) ranging from 19 to 26 microm. The accuracy of the replica to master (the mean discrepancy) ranged from 0.5 to 2.0 microm (95% confidence interval 1.5-2.9 microm). SIGNIFICANCE: The greatest precision of the measurement was seen in the jacket surface of the die. The size of the stone replicas varied and the repeatability coefficient was on average 15 microm (2-25 microm) greater for the replica-to-master alignment than the repeated digitizations of the master. SN - 0109-5641 UR - https://www.unboundmedicine.com/medline/citation/18336900/Computer_aided_analysis_of_digitized_dental_stone_replicas_by_dental_CAD/CAM_technology_ DB - PRIME DP - Unbound Medicine ER -