Effect of substrate condition and substituted phenols and methacrylates on toluene diisocyanate/dentin bond strengths
✍ Scribed by Stackhouse, James A. ;Kristol, David S. ;Von Hagen, Stanley ;Rao, Gururajan
- Publisher
- John Wiley and Sons
- Year
- 1989
- Tongue
- English
- Weight
- 491 KB
- Volume
- 23
- Category
- Article
- ISSN
- 0021-9304
No coin nor oath required. For personal study only.
✦ Synopsis
One aim of this in vitro investigation was to determine the effect of substituting four phenols and two methacrylates with vinyl functions on the dentin bond strengths of several new experimental dentin bonding agents. Another objective was to determine the effect of postextraction age and dentin level within the tooth on tensile bond strengths of these toluene diisocyanatederived adhesives. Extracted third molars were divided into postextraction age groups and sectioned into three slices -400 pm thick. The four substituted phenols were: eugenol, o-methoxyphenol, a-chlorophenol, and p-cresol. Substituted methacrylates with vinyl ligands were 2-hydroxyethyl methacrylate (HEMA) and 6-hydroxyhexyl methacrylate (HHMA). Results showed that adhesives made with o-chlorophenol, p-cresol, and methoxyphenol with HEMA were the best, while those made with eugenol and HHMA were the worst. The post extraction age of the tooth and the dentin depth had no consistent effect on most adhesive bond strengths which were generally around 10.3 MPa (1500 psi).