Document Detail

A comparison of an accelerated technique for casting post-and-core restorations with conventional techniques.
MedLine Citation:
PMID:  8298719     Owner:  NLM     Status:  MEDLINE    
PURPOSE: This project compares an accelerated technique for the casting of post-and-core restorations with four traditional techniques. The accelerated technique uses two phosphate-bonded investments and the traditional techniques use a gypsum- and a phosphate-bonded investment. The study measures and compares the differences between the seating of the casting and the seating of the acrylic resin pattern. The effects of the techniques on the fit of castings with and without a ferrule are also compared. MATERIALS AND METHODS: Six groups of 10 castings were made from plastic patterns formed on a stainless steel test die. A different investment and/or burnout method was used for each group. Each group had two subgroups: ferruled and nonferruled. The fit of the plastic patterns was measured at two time intervals after forming, 2 weeks and 3 months. The patterns were invested immediately after the 3-month measurement, and the difference in fit of the castings was calculated. An ANOVA and Tuckey-Kramer test were done to determine the statistical validity. RESULTS: The seating of the patterns after 3 months of storage was consistently worse than the 2-week measurements of fit. The ferrule and nonferrule patterns were not statistically different in seating. Measurement of the castings showed that the ferruled castings seated significantly worse than the nonferrule castings. The difference in the seating of the castings as compared with the patterns was considered clinically unacceptable, showing a range of 0.301 mm to 0.528 mm. The nonferrule castings showed a significant difference in seating among groups. The difference ranged from -0.099 mm to 0.322 mm. CONCLUSIONS: The castings of the ferrule subgroups were considered clinically unacceptable and were not analyzed for significance. Among the nonferrule castings, the group using a gypsum investment and conventional technique for investing and burnout but no ring liner showed the best seating. The accelerated technique was intermediate in seating with a difference of 0.148 mm from the seating of the patterns. This group was significantly different from the two best groups but not from the remaining three groups.
W V Campagni; M H Reisbick; M Jugan
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Publication Detail:
Type:  Comparative Study; Journal Article    
Journal Detail:
Title:  Journal of prosthodontics : official journal of the American College of Prosthodontists     Volume:  2     ISSN:  1059-941X     ISO Abbreviation:  J Prosthodont     Publication Date:  1993 Sep 
Date Detail:
Created Date:  1994-03-10     Completed Date:  1994-03-10     Revised Date:  2006-11-15    
Medline Journal Info:
Nlm Unique ID:  9301275     Medline TA:  J Prosthodont     Country:  UNITED STATES    
Other Details:
Languages:  eng     Pagination:  159-66     Citation Subset:  D    
Allegheny General Hospital, Pittsburgh, PA.
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MeSH Terms
Analysis of Variance
Calcium Sulfate
Dental Casting Investment
Dental Casting Technique*
Post and Core Technique*
Reg. No./Substance:
0/Dental Casting Investment; 0/Phosphates; 7778-18-9/Calcium Sulfate

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

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