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Microtensile bond strength of silorane-based resin composite and its corresponding adhesive in Class I occlusal
Nantawan Krajangta1, Sirivimol Srisawasdi
1Department of Operative Dentistry, Faculty of Dentistry, Chulalongkorn University, Henri-Dunant Road, Bangkok 10330, Thailand.
Purpose:
To determine the performance of a silorane-based resin composite, compared to that of a methacrylate-based resin composite, when used with their corresponding adhesive systems, and to determine the effects of c-factor and water storage time in Class I occlusal preparation, by means of microtensile bond strength (microTBS) test.
Methods:
Extracted human third molars were ground flat to expose dentin, and randomly divided into eight groups, according to the type of resin composite, c-factor, and water storage time: (1) Filtek P90/ high c-factor/24 hours, (2) Filtek P90/low c-factor/24 hours, (3) Filtek Z250/high c-factor/24 hours, (4) Filtek Z250/low c-factor/24 hours, (5), Filtek P90/ high c-factor/3 months, (6) Filtek P90/low c-factor/3 months, (7) Filtek Z250/high c-factor/3 months, and (8) Filtek Z250/ low c-factor/3 months. After 24 hours or 3 months of water storage, the bonded hourglass specimens were tested for microTBS, and failure types were also noted. Data were analyzed using three-way ANOVA and Tamhane post-hoc test (alpha = 0.05).
Results:
Filtek Z250/low c-factor/24 hours exhibited the highest microTBS (54.19 +/- 9.05 MPa), and Filtek P90/high c-factor/3 months exhibited the lowest (6.94 +/- 2.07 MPa). All groups tested in high c-factor (> 4) preparations and 3-month water storage time showed significant decrease in microTBS, except when comparing between Filtek P90/high c-factor/24 hours and Filtek P90/high c-factor/3 months as there was no statistical difference.
