Document Detail

Bond strengths of Dyract AP compomer material to dentin of permanent and primary molars: phosphoric acid versus non-rinse conditioner.
MedLine Citation:
PMID:  14528776     Owner:  NLM     Status:  MEDLINE    
PURPOSE: The purpose of this in vitro study was to determine the shear bond strengths (SBS) of Non-Rinse Conditioner (NRC, Dentsply) combined with Prime & Bond NT (PBNT, Dentsply), a 1-bottle adhesive. The null hypothesis tested was that the use of NRC with PBNT would not result in SBS different from those obtained with conventional phosphoric acid (PA) etching and bonding application to permanent and primary dentin. METHODS: Extracted human third molars and primary molars were mounted length-wise in acrylic resin. The occlusal surfaces were ground to expose a flat dentin surface, and then polished to 600 grit silicon carbide paper to create smear layers similar to those created with high-speed burs. The teeth were randomly assigned to 4 groups (N = 10) according to the etchant/conditioner (PA vs NRC) and dentin (permanent vs primary) used: (Group I: permanent dentin, PA, PBNT; Group II: primary dentin, PA, PBNT; Group III: permanent dentin, NRC, PBNT; Group IV: primary dentin, NRC, PBNT). Specimens were then secured in a split mold, having a 5 mm diameter opening and a polyacid-modified resin composite (Dyract AP, Dentsply) were inserted and light cured incrementally onto the treated dentin surfaces. All specimens were stored in water for 24 hours prior to shear strength testing using a Franell testing machine at a crosshead speed of 0.8 mm/minute. RESULTS: The mean dentin SBS values (MPa) for the groups were: Group I (13.32 +/- 6.6); Group II (15.21 +/- 5.25); Group III (8.87 +/- 3.12); and Group IV (7.42 +/- 2.98). Analysis of variance and Duncan's multiple range tests indicated significant differences among groups at P < 0.05. CONCLUSIONS: In general, the SBS were remarkably greater in the 2 groups etched with PA in comparison with the 2 groups conditioned with NRC. However, the type of dentin tissue did not influence SBS.
Ziad D Baghdadi
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Publication Detail:
Type:  Clinical Trial; Comparative Study; Journal Article; Randomized Controlled Trial    
Journal Detail:
Title:  Journal of dentistry for children (Chicago, Ill.)     Volume:  70     ISSN:  1551-8949     ISO Abbreviation:  J Dent Child (Chic)     Publication Date:    2003 May-Aug
Date Detail:
Created Date:  2003-10-07     Completed Date:  2003-11-20     Revised Date:  2010-08-26    
Medline Journal Info:
Nlm Unique ID:  101180951     Medline TA:  J Dent Child (Chic)     Country:  United States    
Other Details:
Languages:  eng     Pagination:  145-52     Citation Subset:  D; IM    
Department of Pediatric Dentistry, Damascus University School of Dentistry.
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MeSH Terms
Acid Etching, Dental*
Analysis of Variance
Compomers / chemistry*
Dental Bonding*
Dentin / ultrastructure*
Dentin-Bonding Agents / chemistry
Maleates / chemistry*
Materials Testing
Molar / ultrastructure*
Phosphoric Acids / chemistry*
Polymethacrylic Acids / chemistry
Smear Layer
Stress, Mechanical
Time Factors
Tooth, Deciduous / ultrastructure*
Water / chemistry
Reg. No./Substance:
0/Compomers; 0/Dentin-Bonding Agents; 0/Dyract; 0/Maleates; 0/Phosphoric Acids; 0/Polymethacrylic Acids; 0/Prime and Bond NT; 0/non-rinse conditioner; 7732-18-5/Water

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

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