Effect of molar mass of an experimental primer on shear bond strength to dentin

✍ Scribed by Nicola D. Richards; Karl-Johann Söderholm; Christopher D. Batich

• Publisher: John Wiley and Sons
• Year: 2004
• Tongue: English
• Weight: 142 KB
• Volume: 70B
• Category: Article
• ISSN: 1552-4973
• DOI: 10.1002/jbm.b.30048

✦ Synopsis

Abstract

A novel oligomer was synthesized in different molecular masses and used as a primer in dentin bonding. The hypothesis was that an intermediate molecular mass would optimize the conflicting needs for diffusion into etched dentin (low M~w~) and high mechanical properties (high M~w~). The initial oligomer synthesized was tert butylmethacrylate‐co‐maleic anhydride, which was further reacted to add hyrdoxyethyl methacrylate (HEMA) across the anhydride. The oligomer was synthesized in a series of molecular masses from ∼800–6000 amu. The oligomer with an average M~w~ of ∼1000 amu provided the highest bond strength (16 MPa), with both lower and higher molar mass oligomers producing lower bond strengths. A polynomial model was fitted to the data with an R^2^ = 0.606, while a linear model only had an R^2^ = 0.534. This implies that the graph of molar mass to bond strength has a maximum in the range of molar masses examined, and that an optimum molar mass can be found between 800 and 6000 amu. © 2004 Wiley Periodicals, Inc. J Biomed Mater Res Part B: Appl Biomater 70B: 384–388, 2004