Cuspal deflection of directly or indirectly restored teeth

• Published in: Brazilian dental science Vol. 16; no. 4; pp. 34 - 40
• Main Authors: Rocha, Daniel Maranha da, Silva, João Maurício Ferraz da, May, Liliana Gressler, Araújo, Maria Amélia Máximo, Di Nicoló, Rebeca, Rocha, João Carlos
• Format: Journal Article
• Language: English
• Published: 05.12.2013
• ISSN: 2178-6011; 2178-6011
• DOI: 10.14295/bds.2013.v16i4.899

Objective: The aim of this study was to evaluatethe cuspal deflection of teeth restored directlyand indirectly. Material and Methods: Fortysound maxillary premolar teeth were restoredwith composite and different base materials. Widemesial-occlusal-distal cavity preparations wereperformed, with isthmus width of one third of thedistance between the cuspal tips, 3 mm occlusaland a 5 mm interproximal preparation height. Theteeth were divided into 4 groups (n = 10), accordingto the restoration type: G1) GIC-DCR (1 mm glassionomer cement base and direct restoration usingnanoparticulate composite); G2) FL-DCR (1 mm baseof flowable composite resin and direct restorationusing nanoparticulate composite); G3) GIC-ICR(1 mm glass ionomer cement base and indirectrestoration using nanoparticulate composite GICbase); G4) FL-ICR (1 mm base of flowable compositeresin and indirect restoration using nanoparticulatecomposite). The specimens were submitted tocompressive load of 50 N on the buccal and lingualcusps, in a universal testing machine. The lingualcusp microstrain (??) measurements were executedby strain gauges. Results: The Kruskal-Wallis (5%)test was used and showed there were no significantdifferences among the microstrain values for the fourstudy groups (G1 = 1250; G2 = 1075; G3 = 1279;G4 = 937). Conclusion: It could be concluded thatthe restorative techniques and the bases employeddid not show any influences in cuspal deflection.KeywordsBase materials; Cuspal defection; Composite resin; Direct restoration; Indirect restoration.