The Effect of Remaining Tooth Thickness on Composite Bond Strength to the Occlusal Cavity Wall

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  • Takako YOSHIKAWA
    Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
  • Alireza SADR
    Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU)
  • Junji TAGAMI
    Cariology and Operative Dentistry, Department of Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University (TMDU) Global Center of Excellence (GCOE) Program; International Research Center for Molecular Science in Tooth and Bone Diseases

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  • 大臼歯咬合面窩洞の残存歯質厚さとレジン接着性の影響

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Abstract

 Purpose: The purpose of this study was to evaluate the effect of remaining tooth thickness (RTT) on resin composite bond strength to the mesial wall and distal wall when using two-step and one-step self-etching adhesive systems.<br> Methods: The occlusal enamel was ground to expose flat superficial dentin surfaces of human molars. Box-form occlusal cavities of 3 mm long×5 mm wide were prepared to a depth of 4 mm below the flat dentin surfaces. The buccal and lingual walls of cavities were removed to make flat surfaces (mesial wall and distal wall) for bonding. Each specimen was restored with one of two adhesives: the one-step self-etching system Clearfil tri-S Bond (Kuraray Noritake Dental, TS) ; or the two-step self-etching system Clearfil SE Bond (Kuraray Noritake Dental, SE) ; followed by buildup using Z100 resin composite (3M ESPE). After 600 mW/cm2 light-curing for 40 s, teeth were stored for 24 hours in water. The teeth were sectioned perpendicularly to the flat mesial and distal wall dentin to obtain approximately 1 mm2 beams. RTT from the resin-dentin bond to the tooth surface was measured in each slab using a digital caliper.<br> The micro-tensile bond strength (μTBS, MPa) was determined. Data (n=6) were analyzed using Bonferroni's test.<br> Results: TS showed significantly lower μTBS for the RTT<2 mm substrates compared with that of the RTT≥2 mm group (p<0.05). However, there was no significantly different μTBS between the RTT<2 mm group and RTT≥2 mm group using SE (p>0.05).<br> Conclusions: Bonding to wall dentin was affected by remaining tooth thickness when using the one-step self-etching system Clearfil tri-S Bond. However, for the two-step self-etching system Clearfil SE Bond, bond strength to wall dentin was not affected by the remaining tooth thickness.

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