Effect of post type and restorative techniques on the strain and fracture resistance of flared incisor roots

Brazilian Dental Journal

Gisele Rodrigues Da Silva²  Paulo César De Freitas Santos-filho²  Paulo Cézar Simamoto-júnior²  Luis Roberto Marcondes Martins¹  Adérito Soares Da Mota²  Carlos José Soares² 

[1] ,UFU - Federal University of Uberlândia Dental School Department of Operative Dentistry and Dental Materials MG ,Brazil

关键词: flared endodontically treated teeth;    strain;    fracture resistance;    cast posts and core;    glass fiber post;   

DOI  :  10.1590/S0103-64402011000300009

来源: SciELO

【 摘 要 】

Restoring flared endodontically treated teeth continues to be a challenge for clinicians. This study evaluated the effect of post types and restorative techniques on the strain, fracture resistance, and fracture mode of incisors with weakened roots. One hundred five endodontically treated bovine incisors roots (15 mm) were divided into 7 groups (n=15). The two control groups were (C) intact roots restored with Cpc (cast posts and core) or Gfp (glass fiber posts). The five experimental groups were (F) flared roots restored with GfpAp (Gfp associated with accessory glass fiber posts), GfpRc (anatomic Gfp, relined with composite resin), and GfpRcAp (anatomized Gfp with resin and accessory glass fiber posts). All teeth were restored with metal crowns. Mechanical fatigue was performed with 3x10(5)/50 N. Specimens were loaded at 45º, and the strain values (μS) were obtained on root buccal and proximal surfaces. Following that, the fracture resistance (N) was measured. One-way ANOVA and Tukey's HSD tests (α=0.05) were applied, and failure mode was checked. No significant difference in strain values among the groups was found. Cpc presented lower fracture resistance and more catastrophic failures in flared roots. Gfp associated with composite resin or accessory glass fiber posts seems to be an effective method to improve the biomechanical behavior of flared roots.

【 授权许可】

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