Document Detail

Effect of intrapulpal pressure simulation in vitro on shear bond strengths and hybrid layer formation.
MedLine Citation:
PMID:  11803998     Owner:  NLM     Status:  MEDLINE    
PURPOSE: To test the hypothesis that simulation of an intrapulpal pressure during the application of dentin bonding systems influences hybrid layer formation in vitro. MATERIALS AND METHODS: 180 teeth and three different bonding agents were used for shear bond strength measurements and for confocal laser scanning microscopy studies on the dentin-composite interface. The bonding agents (30 teeth each material) were applied without (90 teeth, Group A) and with intrapulpal pressure simulation of 34 cm H20 with water (90 teeth, Group B). 45 specimens from each group were sheared in a testing machine, and 45 teeth from each group were used for CLSM studies after labeling the primer components of the bonding agents with a fluorescent dye. RESULTS: After simulation of pulpal pressure the bond strengths decreased significantly in all groups (Syntac [without/with]: 16.0 +/- 4.5/8.0 +/- 3.7, P= 0.001; Gluma: 13.3 +/- 4.6/8.4 +/- 4.4, P= 0.008; Prime & Bond NT: 14.8 +/- 5.8/8.7 +/- 5.7, P= 0.007; n = 15 each; U-tests). There were no significant differences between the hybrid layer thickness without/with simulation of pulpal pressure (Syntac: 3.6 +/- 0.6/4.1 + 1.2, P= 0.35; Gluma: 3.5 +/- 0.6/3.7 + 0.9, P= 0.49; Prime & Bond NT: 3.5 +/- 0.9/3.8 + 0.8, P= 0.44; n = 15 each; U-tests). In the case of simulation of an intrapulpal pressure, CLSM examination revealed a distinctly shallower penetration of the adhesives into dentin compared to the samples treated without intrapulpal pressure.
T Pioch; H J Staehle; H Schneider; H Duschner; C E Dörfer
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Publication Detail:
Type:  Comparative Study; Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of dentistry     Volume:  14     ISSN:  0894-8275     ISO Abbreviation:  Am J Dent     Publication Date:  2001 Oct 
Date Detail:
Created Date:  2002-01-23     Completed Date:  2002-04-12     Revised Date:  2010-08-26    
Medline Journal Info:
Nlm Unique ID:  8806701     Medline TA:  Am J Dent     Country:  United States    
Other Details:
Languages:  eng     Pagination:  319-23     Citation Subset:  D    
Department of Conservative Dentistry and Periodontology, Dental School, University of Heidelberg, Germany.
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MeSH Terms
Acid Etching, Dental
Composite Resins / chemistry
Dental Bonding*
Dental Pulp / physiology*
Dentin / ultrastructure*
Dentin-Bonding Agents / chemistry*
Fluorescent Dyes / diagnostic use
Glutaral / chemistry
Microscopy, Confocal
Polymethacrylic Acids / chemistry
Resin Cements / chemistry
Rhodamines / diagnostic use
Statistics as Topic
Statistics, Nonparametric
Stress, Mechanical
Surface Properties
Reg. No./Substance:
0/Composite Resins; 0/Dentin-Bonding Agents; 0/Fluorescent Dyes; 0/Polymethacrylic Acids; 0/Prime and Bond NT; 0/Resin Cements; 0/Rhodamines; 0/Syntac dentine adhesive; 111-30-8/Glutaral; 36877-69-7/rhodamine isothiocyanate; 95918-03-9/Gluma

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

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