Effect of substrate condition and substituted phenols and methacrylates on toluene diisocyanate/dentin bond strengths.
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 diisocyanate-derived adhesives. Extracted third molars were divided into postextraction age groups and sectioned into three slices approximately 400 microns thick. The four substituted phenols were: eugenol, o-methoxyphenol, o-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).
Stackhouse
J A
JA
UMDNJ-N.J. Dental School, Department of Restorative Dentistry, Newark 07103.
Kristol
D S
DS
Von Hagen
S
S
Rao
G
G
D000179:Acrylates; D003485:Cyanates; D003738:Dental Cements; D003804:Dentin; D006801:Humans; D008024:Ligands; D008689:Methacrylates; D008963:Molar; D010636:Phenols; D013329:Structure-Activity Relationship; D014051:Toluene 2,4-Diisocyanate
D000179:Acrylates; D003485:Cyanates; D003738:Dental Cements; D008024:Ligands; D008689:Methacrylates; D010636:Phenols; D014051:Toluene 2,4-Diisocyanate