Document Detail

New die design for dimensional accuracy assessment of crown castings.
MedLine Citation:
PMID:  12675449     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The aim of this study was to introduce a newly designed die for ceramometal restoration, and to compare the dimensional accuracy with the traditional complete-crown design. Two methods of dimensional accuracy assessment, vertical axial discrepancy and transverse diametral percentage, were compared. MATERIALS AND METHODS: Patterns were prepared from two different die designs--complete crown and ceramometal. Two investments available for titanium crown casting were used, Titavest CB and T-invest C & B. Titanium castings were made from each investment with a high-pressure casting machine. Vertical axial discrepancy of casting was determined by measuring the discrepancy for each set of wax patterns and their castings on the same die under a traveling microscope. Dimensional accuracy was expressed as vertical axial discrepancy and by transforming the vertical axial discrepancy into transverse diametral percentage. RESULTS: Both dies produced undersized castings with T-invest C & B and oversized castings with Titavest CB. Dimensional accuracy assessment of the two different types of crown casting design showed no significant difference in vertical axial discrepancy. CONCLUSION: Compared to the traditional transverse diametral percentage calculation, the vertical axial discrepancy assessment is independent of the die's dimensions. The two types of investment materials studied resulted in castings with different dimensional accuracies.
Danny Low
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  The International journal of prosthodontics     Volume:  16     ISSN:  0893-2174     ISO Abbreviation:  Int J Prosthodont     Publication Date:    2003 Jan-Feb
Date Detail:
Created Date:  2003-04-04     Completed Date:  2003-07-01     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  8900938     Medline TA:  Int J Prosthodont     Country:  United States    
Other Details:
Languages:  eng     Pagination:  13-8     Citation Subset:  D    
Faculty of Dentistry, University of Hong Kong, China.
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MeSH Terms
Dental Casting Investment / chemistry
Dental Casting Technique / instrumentation*
Dental Prosthesis Design / instrumentation*
Metal Ceramic Alloys / chemistry
Statistics, Nonparametric
Surface Properties
Titanium / chemistry
Reg. No./Substance:
0/Dental Casting Investment; 0/Metal Ceramic Alloys; 7440-32-6/Titanium

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine

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