| 2716 Sonication of highly-viscous glass-ionomer: effect on interface with dentin | ||
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K.E. MIETTUNEN1, E. BRESCIANI2, J.A. BARROS1, F. GU1, and M.C. PETERS1, 1University of Michigan, Ann Arbor, USA, 2U of Michigan/CRSE – U of Sao Paulo, Bauru, Brazil Sonication has shown to improve mechanical characteristics of highly-viscous glass-ionomers (HV-GIC) but the effect on the interface with dentin is not yet known. Objectives: We investigated the effect of ultrasonic accelerated setting of HV-GIC restorations on the microtensile bond strength (MTBS) of HV-GIC to dentin. Methods: After cuspal reduction and occlusal preparation, 45 extracted 3rd molars were randomly distributed over three groups (N=15) and restored, according to manufacturers' instructions, with either (A) Ketac Molar Aplicap (3M/ESPE), (B) Fuji IX GP (GC Corp), or (C) Ketac Molar EasyMix (3M/ESPE). Application of direct (DU), indirect (IU), or no ultrasound (NU) was randomly assigned to each subgroup (N=5) as part of the restorative insertion process. After setting, the restoration build-ups were covered with vaseline and the teeth were stored in 100% humidity at 4oC for seven days. MTBS specimens were prepared and tested to compare the strength of HV-GIC in the interfacial region with dentin in all subgroups. Fracture mode was recorded. Results: The data showed a statistical difference (p<0.0001) between treatment groups: mean MTBS for DU=3.82 MPa, IU=6.47 MPa, and NU=5.12 MPa. No statistical difference was found between the three materials tested (p=0.8495). Conclusions: Indirect sonication of HV-GIC restorations resulted in a 26% increase in strength in the interfacial region. Supported in part by NIDCR/NIH DE007057; complimentary materials provided by GC Corp and 3M/ESPE. | ||
| Seq #282 - Tooth, Biocompatibility 10:45 AM-12:00 PM, Saturday, March 24, 2007 Ernest N. Morial Convention Center Exhibit Hall I2-J | ||
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