Influence of environmental conditions on dentin bond strengths of recently developed dentin bonding systems.

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A study was conducted to investigate the influence of temperature and relative humidity (RH) on the bond strengths of several recently developed dentin bonding systems. Six environmental conditions, (A) 25±0.5°C, 50±5% RH, (B) 25±0.5°C, 80±5% RH, (C) 25±0.5°C, 95±5% RH, (D) 37±0.5°C, 50 ±5% RH, (E) 37±0.5°C, 80±5% RH, (F) 37±0.5°C, 95±5% RH were used. Bovine mandibular incisors were mounted in self-curing resin and the facial surfaces were ground on wet #600 SiC paper to expose the dentin. After the tooth surface had been treated according to each manufacturer's instructions, adhesives were applied, followed by condensation of resin composites into a mold placed on the dentin surface. Fifteen specimens per group were stored in distilled water at 37°C for 24 h, and then shear-tested at a cross-head speed of 1.0 mm/min. Statistical analysis was carried out with two-way ANOVA followed by Tukey's test (<I>P</I><0.05). Dentin bond strengths decreased with increasing relative humidity but were not influenced by environmental temperature. Even though one-bottle adhesive systems require a wet dentin surface, their bond strengths are affected by an increase in environmental humidity. (J. Oral Sci.43, 35-40, 2001)
日本大学歯学部の論文