1342 Effect of Storage Duration on Wettability of Resin Composites

Saturday, March 24, 2012: 9:45 a.m. - 11 a.m.
Presentation Type: Poster Session
S.S. KHAJOTIA, and A.T. PHAN, Department of Dental Materials, University of Oklahoma Health Sciences Center, Oklahoma City, OK
Objectives: To determine the time-dependent wettability of selected resin composites after storage in water at oral temperature (37°C) for 2 days, 4 days and 7 days.  Methods: Six specimens (d=6.0mm, h=3.6mm) each of resin composites Estelite-Σ (ES; Tokuyama), Esthet-X HD (EX; Dentsply/Caulk), Gradia Direct (GR; GC), Point 4 (PF; Kerr), and TPH3 (TP; Dentsply/Caulk) were fabricated in a stainless steel mold. The specimens (n=30 total) were polymerized against a glass slab. A 3μL drop of deionized, filtered water was dispensed onto the unpolished surfaces of the specimens within 90 min after polymerization (Day 0) in a contact angle goniometer (OCA15-Plus, Future Digital Scientific Corp.). High-resolution digital images of the axisymmetric sessile drop were recorded @ 1 frame/second for 10 min at 37±1ºC. Profiles of the drops were analyzed using the goniometer’s software to determine contact angle (θ) values using the Laplace-Young equation. After testing, the specimens were stored in ultrapure water in a bath at 37±1°C and were retested after 2-, 4- and 7-days. Contact angle values at drop placement (θ Initial) and at time=450s (θ Final) for each storage duration were compared using General Linear Models and Student-Newman-Keuls (SNK) tests (α=0.05).  Results: Mean ± StdDev values for θinitial (degrees) were as follows:
































Superscript letters in each column denote mean values that are statistically different from each other (p<0.05).

Conclusions: Mean initial contact angles of products EX and TP decreased significantly after storage in water at oral temperature for up to seven days, whereas the mean initial contact angle values remained the same for the remaining resin composites tested.  Funding: J. Dean Robertson Society, University of Oklahoma.

This abstract is based on research that was funded entirely or partially by an outside source: J. Dean Robertson Society, University of Oklahoma

Keywords: Composites, Contact angle, Dental materials, Physical and Surfaces
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