Fracture resistance and microtensile bond strength of maxillary premolars restored with two resin composite inlay systems.
OBJECTIVE
To compare the in vitro fracture resistance and the microtensile bond strength (muTBS) of premolar teeth restored with two light-cured resin composite inlay systems.


METHODS
50 sound human maxillary premolars were divided randomly into five equal groups. Four groups received mesial-occlusal-distal (MOD) inlay preparations. Restorative treatments comprised: Group 1 (Renew direct resin composite), Group 2 (Renew direct resin composite inlay), Group 3 (Tescera indirect resin composite inlay), Group 4 (non-restored), Group 5 (intact). All teeth were loaded axially until fracture. The same resin-based materials as used in Groups 1-3 were bonded to the superficial coronal dentin of 15 teeth. Beams approximately 1.0 mm x 1.0 mm were prepared and tested in microtensile mode. Results were compared using one-way ANOVA and Tukey's multiple comparison tests.


RESULTS
Mean fracture strengths (KN): Group 1, 2.06 (0.76); Group 2, 2.30 (0.49); Group 3, 2.62 (0.68); Group 4, 1.24 (0.44); Group 5, 2.40 (0.71). Group 4 was significantly weaker that the other four groups, P < 0.01. Mean muTBSs (MPa): Group 1, 33.38 (6.24); Group 2, 20.38 (6.24); Group 3, 20.87 (4.62). Group 1 was significantly stronger than the other two groups, P < 0.01.
Sun
Ya-Shou
YS
Institute of Stomatology, Nanjing Medical University, Nanjing, PR China.
Chen
Ya-Ming
YM
Smales
Roger J
RJ
Yip
Kevin H K
KH
D000134:Acid Etching, Dental; D000537:Aluminum Oxide / Q000737:chemistry; D001641:Bicuspid / Q000503:physiopathology*; D003188:Composite Resins / Q000737:chemistry*; D001840:Dental Bonding; D003737:Dental Cavity Preparation / Q000379:methods; D045662:Dental Etching; D019232:Dental Restoration Failure; D003804:Dentin / Q000503:physiopathology; D006801:Humans; D007284:Inlays; D008422:Materials Testing; D008437:Maxilla; D008689:Methacrylates / Q000737:chemistry; D013314:Stress, Mechanical; D013718:Tensile Strength; D014082:Tooth Fractures / Q000503:physiopathology*
D003188:Composite Resins; D008689:Methacrylates; C485364:Renew composite; C481143:TESCERA; D000537:Aluminum Oxide