Effect of root canal preparation, type of endodontic post and mechanical cycling on root fracture strength

• Main Authors: Marília Pivetta RIPPE (Author), Manuela Favarin SANTINI (Author), Carlos Alexandre Souza BIER (Author), Paolo BALDISSARA (Author), Luiz Felipe VALANDRO (Author)
• Format: Book
• Published: University of São Paulo, 2014-06-01T00:00:00Z.
• Subjects: article
• Online Access: Connect to this object online.
• Notes: 1678-7765; 10.1590/1678-775720130051
• Keywords: Post and core; Root canal preparation; Aging; Dentistry; RK1-715
• Source: Journal of Applied Oral Science, Vol 22, Iss 3, Pp 165-173 (2014)

Objective: To evaluate the impact of the type of root canal preparation, intraradicular post and mechanical cycling on the fracture strength of roots. Material and Methods: eighty human single rooted teeth were divided into 8 groups according to the instruments used for root canal preparation (manual or rotary instruments), the type of intraradicular post (fiber posts- FRC and cast post and core- CPC) and the use of mechanical cycling (MC) as follows: Manual and FRC; Manual, FRC and MC; Manual and CPC; Manual, CPC and MC; Rotary and FRC; Rotary, FRC and MC; Rotary and CPC; Rotary, CPC and MC. The filling was performed by lateral compactation. All root canals were prepared for a post with a 10 mm length, using the custom #2 bur of the glass fiber post system. For mechanical cycling, the protocol was applied as follows: an angle of incidence of 45°, 37°C, 88 N, 4 Hz, 2 million pulses. All groups were submitted to fracture strength test in a 45° device with 1 mm/ min cross-head speed until failure occurred. Results: The 3-way ANOVA showed that the root canal preparation strategy (p<0.03) and post type (p<0.0001) affected the fracture strength results, while mechanical cycling (p=0.29) did not. Conclusion: The root canal preparation strategy only influenced the root fracture strength when restoring with a fiber post and mechanical cycling, so it does not seem to be an important factor in this scenario.