title: Influence of surrounding wall thickness on the fatigue resistance of molars restored with ceramic inlay.
abstract: The purpose of this study was to evaluate the influence of buccal and lingual wall thickness on the fatigue resistance of molars restored with CAD/CAM ceramic inlays. Forty human third molars were selected and divided into 4 groups, according to the remaining surrounding wall thickness chosen for inlay preparation (n=10): G1, 2.0 mm; G2, 1.5 mm; G3, 1.0 mm; G4, 0.5 mm. All inlays were made from feldspathic ceramic blocks by a CAD/CAM system, and cemented adhesively. After 1 week stored in distilled water at 37 °C, the specimens were subjected to fatigue testing under the following protocol: 5Hz; pre-load of 200 N for 5,000 cycles, followed by increasing loads of 400, 600, 800, 1000, 1200 and 1400 N for 30,000 cycles each. The specimens were cycled until failure or completion of 185,000 cycles. The survival rate of the groups was compared using the Kaplan-Meier survival curves (p>0.05). All specimens withstood the fatigue protocol (185,000 cycles), representing a 100% survival rate. The Kaplan-Meier survival curves showed no difference between groups. It can be concluded that the remaining tooth wall thickness did not influence the fatigue resistance of molars restored with CAD/CAM ceramic inlays.
authors.affiliation: Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: Shizuma
authors.initials: S
authors.lastname: Shibata
authors.affiliation: Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: Renata
authors.initials: R
authors.lastname: Gondo
authors.affiliation: Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: Élito
authors.initials: É
authors.lastname: Araújo
authors.affiliation: Deparment of Mechanical Engineering, Biomechanics Engineering Laboratory, University Hospital, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: Carlos Rodrigo de
authors.initials: CR
authors.lastname: Mello Roesler
authors.affiliation: Department of Dental Sciences, Centre of Heath Sciences, Univ. Federal de Santa Catarina, Florianópolis, SC, Brazil.
authors.forename: Luiz Narciso
authors.initials: LN
authors.lastname: Baratieri
mesh_terms: D002516:Ceramics / Q000737:chemistry*; D017076:Computer-Aided Design; D003738:Dental Cements / Q000737:chemistry; D019232:Dental Restoration Failure; D003799:Dental Stress Analysis; D006801:Humans; D007284:Inlays / Q000379:methods*; D053208:Kaplan-Meier Estimate; D008422:Materials Testing; D008963:Molar / Q000033:anatomy & histology*; D012016:Reference Values; D015203:Reproducibility of Results; D013499:Surface Properties; D013997:Time Factors
chemical_list: D003738:Dental Cements