The effect of taper and apical preparation size on fracture resistance of roots


DOĞANAY YILDIZ E. , Fidan M. E. , SAKARYA R. E. , Dincer B.

AUSTRALIAN ENDODONTIC JOURNAL, vol.47, no.1, pp.67-72, 2021 (Journal Indexed in SCI) identifier identifier identifier

  • Publication Type: Article / Article
  • Volume: 47 Issue: 1
  • Publication Date: 2021
  • Doi Number: 10.1111/aej.12472
  • Title of Journal : AUSTRALIAN ENDODONTIC JOURNAL
  • Page Numbers: pp.67-72
  • Keywords: apical preparation size, fracture resistance, taper, RESIDUAL DENTIN THICKNESS, MANDIBULAR 1ST MOLARS, ROTARY INSTRUMENTATION, MAXILLARY PREMOLARS, TOOTH FRACTURE, FILLED TEETH, ENLARGEMENT, IRRIGATION, REDUCTION, IMPACT

Abstract

This study investigated the effect of taper and apical preparation size on the fracture resistance of roots. 84 mandibular incisor teeth were selected. Groups (n = 12): uninstrumented (control group), 25/0.04, 25/0.06, 25/0.08, 30/0.04, 30/0.06 and 30/0.08. K3XF files (Kerr Endodontics, Orange, CA) were used for canal preparation. Fracture resistance was tested using a Universal test machine. For statistical analysis, the level of significance was P <= 0.05, and one-way anova and post hoc LSD tests were used. The control group showed the highest fracture resistance (P < 0.05). No significant difference was found between 25/0.04 and 25/0.06; 25/0.06 and 25/0.08; 30/0.04 and 30/0.06; 30/0.06 and 30/0.08; 25/0.04 and 30/0.04; 25/0.06 and 30/0.06; and 25/0.08 and 30/0.08 (P > 0.05). Significant differences were found between 25/0.04 and 25/0.08; 30/0.04 and 30/0.08; and 25/0.08 and 30/0.04 (P < 0.05). In conclusion, the clinical selection of larger tapers can cause a higher risk of fracture.