Document Detail

Measurement of band displacement: a methodology to determine composite packability.
MedLine Citation:
PMID:  14620267     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: A posterior composite should be able to maintain its shape when packed against a matrix band. The objective of this study was to develop an in vitro methodology to determine composite packability by measuring the displacement of a matrix band. METHOD AND MATERIALS: The experimental setup consisted of a sectional matrix system secured for the restoration of an occlusodistal cavity preparation. The distance the band was displaced was measured from superimposed digital images. First, band displacements were measured under applied forces of 25, 50, and 75 g for different loading orders. Different forces resulted in different band displacements. Loading order significantly affected band displacements. Thus, the reproducibility of the experimental setup is ensured provided the band is replaced after each test. The cavity was filled with a universal composite (Z100, 3M ESPE) or a posterior composite (Filtek P60, 3M) at 37 degrees C. RESULTS: The band displacements were 32 +/- 28 pm vs 107 +/- 38 microm for Z100 and Filtek P60, respectively. CONCLUSION: The present study proposed measuring band displacement as an in vitro methodology to determine the packability of dental composite. Based on the result, the posterior composite should help in forming contact better than the universal composite tested.
Daranee Tantbirojn; Matthew Trom; James S Hodges; William H Douglas
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't; Research Support, U.S. Gov't, P.H.S.    
Journal Detail:
Title:  Quintessence international (Berlin, Germany : 1985)     Volume:  34     ISSN:  0033-6572     ISO Abbreviation:  Quintessence Int     Publication Date:    2003 Nov-Dec
Date Detail:
Created Date:  2003-11-17     Completed Date:  2004-01-06     Revised Date:  2007-11-14    
Medline Journal Info:
Nlm Unique ID:  0342677     Medline TA:  Quintessence Int     Country:  England    
Other Details:
Languages:  eng     Pagination:  761-5     Citation Subset:  D    
Minnesota Dental Research Center for Biomaterials and Biomechanics, Department of Oral Science, University of Minnesota School of Dentistry, Minneapolis, Minnesota 55455, USA.
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MeSH Terms
Analysis of Variance
Composite Resins*
Dental Restoration, Permanent
Dental Stress Analysis
Image Processing, Computer-Assisted
Materials Testing
Matrix Bands*
Reproducibility of Results
Silicon Dioxide
Grant Support
Reg. No./Substance:
0/Composite Resins; 0/Filtek P60 Composite Resin; 0/Z100 composite resin; 7440-67-7/Zirconium; 7631-86-9/Silicon Dioxide

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

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