Journal article
The influence of water storage and C-factor on the dentin–resin composite microtensile bond strength and debond pathway utilizing a filled and unfilled adhesive resin
Dental materials, Vol.17(3), pp.268-276
2001
DOI: 10.1016/S0109-5641(00)00081-6
PMID: 11257301
Abstract
Objective: To test the elastic wall concept utilizing adhesive resins of varying stiffness in a low- and high-C-factor cavity design after short- and long-term water storage.
Methods: A flat and box-shaped cavity was restored on occlusal dentin with a resin composite using a filled and unfilled adhesive resin from which microtensile specimens with a 0.5
mm
2 cross-sectional area were formed. After storage for 30- and 150-days the microtensile bond strength (μTBS) was determined in a Zwick materials testing machine and the subsequent debond pathway was examined under scanning electron microscopy. Fisher's exact test was used to determine differences in joint and substrate failure modes and a Weibull regression model with gamma frailties was used to test for differences between failure distributions. Tests for three-way and two-way interactions were also completed for storage time, C-factor and adhesive. All tests were at 95% confidence levels.
Results: The characteristic strength (TBS°) for the Optibond FL adhesive applied on a flat cavity was 47.57 and 20.90
MPa and a box-shaped cavity was 49.26 and 17.49
MPa for short- and long-term storage, respectively, while the corresponding TBS° for the unfilled Optibond adhesive on the flat cavity design was 36.93 and 32.68
MPa and in a box-shaped cavity was 32.84 and 15.46
MPa. Combining all groups according to storage time revealed a three-fold increase in the debond pathway including the bottom of the hybrid layer.
Significance: Evidence suggests that the durability of the bonded joint is threatened by hydrolysis and the most susceptible region is the bottom half of the hybrid layer and in low C-factor cavity designs a more flexible adhesive resin liner was more durable.
Details
- Title: Subtitle
- The influence of water storage and C-factor on the dentin–resin composite microtensile bond strength and debond pathway utilizing a filled and unfilled adhesive resin
- Creators
- S.R Armstrong - Department of Operative Dentistry, University of Iowa, Iowa City, IA, USAJ.C Keller - Dows Institute for Dental Research, University of Iowa, Iowa City, IA, USAD.B Boyer - Department of Operative Dentistry, University of Iowa, Iowa City, IA, USA
- Resource Type
- Journal article
- Publication Details
- Dental materials, Vol.17(3), pp.268-276
- Publisher
- Elsevier Ltd
- DOI
- 10.1016/S0109-5641(00)00081-6
- PMID
- 11257301
- ISSN
- 0109-5641
- eISSN
- 1879-0097
- Language
- English
- Date published
- 2001
- Academic Unit
- Roy J. Carver Department of Biomedical Engineering; Graduate College Admin and Gen; President; Oral and Maxillofacial Surgery; Operative Dentistry; Dental Research
- Record Identifier
- 9984065994102771
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