Aim. To evaluate the influence of different height of bone on the fracture resistance of endodontically treated teeth restored with glass fiber post with two different insertion length. Materials and Methods. 20 mandibular single rooted premolars were endodontically treated, cut 2 mm above the cement enamel junction (CEJ), and randomly divided into 4 groups: 1) 5 mm post length/2 mm bone level from CEJ; 2) 5 mm post length/5 mm bone level from CEJ; 3) 7 mm post length/2 mm bone level from CEJ; 4) 7 mm post length/5 mm bone level from CEJ. Roots were prepared to receive the posts. Glass fiber posts were seated and luted. The core was built-up with a micro-hybrid resin composite. Each tooth was embedded in a block of self-curing acrylic resin up to 2 and 5 mm below CEJ; all the specimens were prepared with a circumferential 0.5 mm chamfer at CEJ level, and scanned to realize the laser-sintering metal coping (cobalt chrome alloy). Each coping was tried and luted on the tooth with resin cement. Static load was applied until failure. Loads-to-failure [N] were compared amongst the groups. Results. No significant differences were found between groups (ANOVA) in terms of fracture loads. The highest mean value was recorded in the group 2 (1736,4N), the lowest in the group 4 (1038,6N), followed by the group 1 (1445N) and group 3 (1516N). Conclusions. Within the limits of this in vitro study, the length of fiber posts and the height of bone seem to have no influence on the fracture load of restored teeth. Mean values recorded in all the groups are significantly higher than physiological loads recorded. These findings suggest that the post restoration at limited length, followed by full crown coverage, is a reliable restoration option, even in presence of bone height loss.
Effect of fiber post length and bone level on the fracture resistance of endodontically treated teeth
MOBILIO, Nicola;CATAPANO, Santo;
2011
Abstract
Aim. To evaluate the influence of different height of bone on the fracture resistance of endodontically treated teeth restored with glass fiber post with two different insertion length. Materials and Methods. 20 mandibular single rooted premolars were endodontically treated, cut 2 mm above the cement enamel junction (CEJ), and randomly divided into 4 groups: 1) 5 mm post length/2 mm bone level from CEJ; 2) 5 mm post length/5 mm bone level from CEJ; 3) 7 mm post length/2 mm bone level from CEJ; 4) 7 mm post length/5 mm bone level from CEJ. Roots were prepared to receive the posts. Glass fiber posts were seated and luted. The core was built-up with a micro-hybrid resin composite. Each tooth was embedded in a block of self-curing acrylic resin up to 2 and 5 mm below CEJ; all the specimens were prepared with a circumferential 0.5 mm chamfer at CEJ level, and scanned to realize the laser-sintering metal coping (cobalt chrome alloy). Each coping was tried and luted on the tooth with resin cement. Static load was applied until failure. Loads-to-failure [N] were compared amongst the groups. Results. No significant differences were found between groups (ANOVA) in terms of fracture loads. The highest mean value was recorded in the group 2 (1736,4N), the lowest in the group 4 (1038,6N), followed by the group 1 (1445N) and group 3 (1516N). Conclusions. Within the limits of this in vitro study, the length of fiber posts and the height of bone seem to have no influence on the fracture load of restored teeth. Mean values recorded in all the groups are significantly higher than physiological loads recorded. These findings suggest that the post restoration at limited length, followed by full crown coverage, is a reliable restoration option, even in presence of bone height loss.I documenti in SFERA sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
