Journal article
Resin-dentin interfacial ultrastructure and microtensile dentin bond strength after five-year water storage
Operative dentistry, Vol.29(6), pp.705-712
11/2004
PMID: 15646228
Abstract
To evaluate a total-etch three-step adhesive system's resin-dentin interfacial ultrastructure and microtensile dentin bond strength (microTBS) after multi-year storage in water.
Resin composite crowns were formed on 600 grit SiC flattened extracted human molars using a total-etch three-step adhesive system (Optibond FL, Kerr) and a hybrid resin composite (Prodigy, Kerr). microTBS specimens were fabricated and placed in water with 0.5% chloramine T at 37 degrees C until respective static load to failure testing at one-month, six-months and five-year storage. Failure modes were determined by scanning electron microscopy. The interfacial ultrastructure of the resin-dentin interface was analyzed by transmission electron microscopy (TEM) at 48-hours and 44-months storage. microTBS was modeled with Weibull distribution for survival analysis and failure curve distributions were analyzed by the Wald chi-square statistic for significant differences at alpha=0.05.
The characteristic tensile strength (sigma omicron) at one-month, six-months and five-year storage was 52.63, 14.77 and 23.57 Mpa, with a Weibull modulus of 3.04, 1.56 and 1.28, respectively. Failure distributions for all groups were significantly different (p<0.0001) with one-month > five-year > six-months. TEM interfacial morphology demonstrated hydrolytic degradation of hybrid layer components at 44-months storage.
The decrease in tensile strength and changes in ultrastructure may be caused by water sorption and resultant hydrolytic degradation of the adhesive joint.
Details
- Title: Subtitle
- Resin-dentin interfacial ultrastructure and microtensile dentin bond strength after five-year water storage
- Creators
- Steven R Armstrong - Department of Operative Dentistry, College of Dentistry, University of Iowa, Iowa City, IA, USA. steven-armstrong@uiowa.eduM A VargasI ChungD H PashleyJ A CampbellJ E LaffoonF Qian
- Resource Type
- Journal article
- Publication Details
- Operative dentistry, Vol.29(6), pp.705-712
- Publisher
- United States
- PMID
- 15646228
- ISSN
- 0361-7734
- eISSN
- 1559-2863
- Grant note
- K16 DE00175-11 / NIDCR NIH HHS
- Language
- English
- Date published
- 11/2004
- Academic Unit
- Preventive and Community Dentistry; Operative Dentistry; Family Dentistry; Dental Research
- Record Identifier
- 9984066088302771
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