Abstract
Objective: This study aimed to compare the fracture resistance of endodontically treated roots filled by different obturation systems. Material and methods: Ninety-six upper central incisors were used and decoronated, retaining 12 mm of the roots. On the basis of obturation systems, the roots were divided into 4 groups (n=24): Group1 (COGR): control group (unprepared, unfilled), Group 2 (AVGR): ActiV GP points/ActiV GP sealer, Group3 (GPGR): Gutta percha points/AH plus sealer, and Group4 (GAGR): Gutta percha points/ActiV GP sealer. The last three groups were obturated with the single cone technique. The roots were then stored in 100% relative humidity at 37 °C for 2 weeks. A vertical compressive force was exerted with a universal testing machine until a fracture occurred. Data were statistically analyzed with one-way ANOVA. Results: Mean (SD) failure loads for groups ranged from 920.51 ± 210.37 to 1113.44 ± 489.42 N. The fracture resistance between the different study groups indicated no statistical difference. Conclusions: ActiV GP system did not exert a significant effect on the fracture resistance of endodontically treated teeth.
Highlights
S everal factors can affect the fracture resistance of endodontically treated teeth (ETT), such as substance loss [1], preparation for access, presence of ferrule [1,2], shaping of root canal, dehydrating effects of irrigation solutions, long exposure to calcium hydroxide, excessive condensation during canal obturation, material and design of post and cores [3, 4], and preparation for final restoration [3,5,6]
Glass ionomer cement (GIC) based sealers can adhere strongly to root canal walls but they cannot bind to gutta-percha cones namely, after complete setting, a space exists between the sealer and gutta-percha, allowing bacteria to pass through [8]
ActiV GP is a root canal obturation system comprising glass ionomer coated gutta percha cones that are bondable to intracanal dentin, depending on the glass ionomer (GI) sealer used [9]
Summary
Comparar a resistência à fratura de raízes tratadas endodonticamente obturadas através de diferentes sistemas. De acordo com o sistema de obturação, as raízes foram divididas em 4 grupos (n=24): Grupo (COGR): grupo controle (sem preparo, sem preenchimento), Grupo (AVGR): cones ActiV GP / cimento ActiV GP, Grupo (GPGR): cones de guta percha / cimento AH plus, e Grupo (GAGR): cones de guta percha / cimento ActiV GP. Os últimos três grupos foram obturados através da técnica de cone único. Uma força compressiva vertical foi aplicada através de uma máquina de ensaio universal até ocorrer fratura. A resistência à fratura entre os diferentes grupos estudados não indicaram diferença estatística. Conclusão: O sistema ActiV GP não exerceu um efeito significante na resistência à fratura em dentes tratados endodonticamente. ActiV GP; cimento AH plus; Dentes endodonticamente tratados; Resistência à fratura; Gutta percha
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