3136 Repairing aged composites with self-etching systems: an in-vitro bond-strength study
E.C. TEIXEIRA, J.Y. THOMPSON, S.C. BAYNE, A.V. RITTER, and E.J. SWIFT, University of North Carolina, Chapel Hill, USA

Objective: To evaluate the bond-strength of self-etching systems used to repair aged composites. Methods: Fifty cylinders (4mm x 5mm) were fabricated with each of four visible light-cured hybrid composites (AeliteFil, Prodigy, TPH, and Z100) and stored (1% NaCl, 23° C, 6-years) to simulate aging. Aged specimens (n=10/group) were wet-polished through 600-grit SiC paper and randomly assigned to one of four different self-etch repair systems: Tyrian One-Step Plus/AeliteFil (Tyrian, Bisco), OptiBond Solo Plus SE/Prodigy (Solo, Kerr), Xeno III/TPH (Xeno, Dentsply/Caulk) or Prompt L-Pop/Z100 (Prompt, 3M-ESPE). Prime&Bond NT/TPH (P&B, Dentsply/Caulk) was used as an acid-etch control. The repair shear bond strength (SBS) was determined 48 hours after bonding (Instron 4411, CHS=0.5 mm/min). Data were analyzed using ANOVA (p=0.05) and Tukey post-hoc tests. Results: Mean SBS values (MPa ± SD) as a function of aged substrate (Composites) and repair systems are presented in the Table.

Repair Systems

Composites

Tyrian

Solo

Xeno

Prompt

P&B

AeliteFil

18.1 (4.5)

18.6 (1.8)

15.3 (4.6)

17.9 (1.8)

21.8 (3.0)

Prodigy

16.4 (5.0)

19.4 (3.4)

19.0 (4.6)

16.2 (3.3)

19.0 (8.3)

TPH

16.2 (3.8)

21.7 (2.2)

16.3 (6.2)

21.4 (5.0)

20.8 (4.7)

Z100

11.5 (3.1)

15.3 (3.0)

15.2 (6.7)

12.5 (3.9)

19.1 (4.2)

Statistically significant differences were observed between Prime&Bond NT and Tyrian, Xeno III, and Prompt L-Pop. Tyrian One Step Plus and OptiBond Solo Plus SE did not differ from Xeno III and Prompt L-Pop, but were statistically different form each other. Although statistically significant differences were noted between Z100 and the others substrates, the effect of the repair system used was the same for all aged composites. Conclusions: Self-etching systems can be used to repair aged composite but repair of aged composite seems to be system-dependent. Materials contributed by Bisco, Kerr, Dentsply Caulk, and 3M ESPE. E-mail: teixeire@dentistry.unc.edu

Seq #335 - Adhesion III
10:15 AM-11:30 AM, Saturday, 13 March 2004 Hawaii Convention Center Exhibit Hall 1-2

Back to the Dental Materials: I - Adhesion-Composite Bond Strength Program
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