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Fracture strength of teeth restored with ceramic inlays and overlays
Morimoto, Susana; Vieira, Glauco Fioranelli; Agra, Carlos Martins; Sesma, Newton; Gil, Carlos.
  • Morimoto, Susana; University of São Paulo. Dental School. Department of Restorative Dentistry. São Paulo. BR
  • Vieira, Glauco Fioranelli; University of São Paulo. Dental School. Department of Restorative Dentistry. São Paulo. BR
  • Agra, Carlos Martins; University of São Paulo. Dental School. Department of Restorative Dentistry. São Paulo. BR
  • Sesma, Newton; University of São Paulo. Dental School. Department of Prosthodontics. São Paulo. BR
  • Gil, Carlos; University of São Paulo. Dental School. Department of Prosthodontics. São Paulo. BR
Braz. dent. j ; 20(2): 143-148, 2009. ilus
Article in English | LILACS | ID: lil-524510
ABSTRACT
This study evaluated the fracture strength of teeth restored with bonded ceramic inlays and overlays compared to sound teeth. Thirty sound human maxillary premolars were assigned to 3 groups 1- sound/unprepared (control); 2- inlays and 3- overlays. The inlay cavity design was Class II MOD preparation with an occlusal width of 1/2 of the intercuspal distance. The overlay cavity design was similar to that of the inlay group, except for buccal and palatal cusp coverage The inlay and overlay groups were restored with feldspathic porcelain bonded with adhesive cement. The specimens were subjected to a compressive load until fracture. Data were analyzed statistically by the Kruskal-Wallis test at 5 percent significance level. The fracture strength means (KN) were Sound/unprepared group = 1.17, Inlay group= 1.17, and Overlay group = 1.14. There were no statistically significant differences (p>0.05) among the groups. For inlays and overlays, the predominant fracture mode involved fragments of one cusp (70 percent of simple fractures). The fracture strength of teeth restored with inlay and overlay ceramics with cusp coverage was similar to that of intact teeth.
RESUMO
Este estudo avaliou a resistência à fratura de dentes restaurados com inlays e overlays de cerâmicas comparadas a dentes íntegros. Trinta pré-molares humanos íntegros foram divididos em 3 grupos 1-Dentes sem preparo cavitário (controle), 2-Inlays e 3-Overlays. O preparo para as inlays apresentava uma cavidade de Classe II MOD tendo caixa oclusal com largura de metade da distância intercuspídica. O preparo para as overlays era semelhante ao das inlays; porém com cobertura das cúspides vestibular e palatina. Os grupos 2 e 3 foram restaurados com porcelanas feldspáticas fixadas com cimento resinoso. As amostras foram submetidas à compressão até a fratura. Os valores médios de fratura (KN) foram grupo 1 = 1,17, grupo 2 = 1,17 e grupo 3 = 1,14. O teste de Kruskal-Wallis não revelou diferença estatisticamente significante entre os 3 grupos (p>0,05). Para as inlays e overlays, a predominância das fraturas envolveu fragmentos de uma das cúspides (70 por cento de fraturas simples). Concluiu-se que os dentes restaurados com inlays e overlays apresentaram resistência da cúspide comparável aos dentes intactos.
Subject(s)

Full text: Available Index: LILACS (Americas) Main subject: Tooth Fractures / Dental Porcelain / Inlays Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2009 Type: Article Affiliation country: Brazil Institution/Affiliation country: University of São Paulo/BR

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Full text: Available Index: LILACS (Americas) Main subject: Tooth Fractures / Dental Porcelain / Inlays Limits: Humans Language: English Journal: Braz. dent. j Journal subject: Dentistry Year: 2009 Type: Article Affiliation country: Brazil Institution/Affiliation country: University of São Paulo/BR