Kozo Nishimura, DDS, PhD,(a) Miwako Ogata, DDS, PhD,(a) Toru Nikaido, DDS, PhD,(a) Richard M. Foxton, BDS, PhD, MFDS RCS (Ed),(b) and Junji Tagami, DDS, PhD(a,c)
(a)Cariology and Operative Dentistry, Department of Restorative Sciences, Graduate School, Tokyo Medical and Dental University, (b)Department of Conservative Dentistry, Kings College London Dental Institute at Guy’s, King’s College and St. Thomas’ Hospitals, London University, London, UK, and (c)Member of the Center of Excellence Program, FRMDRTB at Tokyo Medical and Dental University, Tokyo, Japan
Purpose: To evaluate the in vivo long-term dentin bond durability of resin composite restorations in wedge-shaped defects using an all-in-one adhesive system.
Materials and Methods: Fifteen non-carious cervical wedge-shaped defects of fifteen patients were restored with a fluoride-releasing adhesive system (Reactmer Bond) and a resin composite (Reactmer Paste). The restored teeth were extracted after 1 day, 1 month and 1 year and then subjected to micro-tensile bond strength (μ-TBS) testing. After the μ-TBS test, the fracture modes of the debonded specimens were observed using a scanning electron microscope. The data of the tensile bond strengths were analyzed using one-way analysis of variance (ANOVA) and Fisher’s PLSD test at a 95% level of confidence.
Results: No restorations failed during the observation periods. The μ-TBSs after 1 day, 1 month, and 1 year were 13.2 MPa, 10.5 MPa and 4.7 MPa, respectively. There was no significant difference in the μ-TBS between 1 day and 1 month, however, the μ-TBS significantly decreased over 1 year.
Conclusion: The tensile bond strengths of the all-in-one adhesive decreased over 1 year. (Int Chin J Dent 2006; 6: 65-69.)
Key Words: all-in-one adhesive, dentin bond durability, wedge-shaped defect.