Effect of post space preparation drills on the incidence of root dentin defects
Zuli Thaise Ayres Bezerra, Guedes Orlando Aguirre, Goncalves Gislaine Figueiredo Zarza Arguello, da Silva Aurelio Rosa Junior, Borges Alvaro Henrique, Aranha Andreza Maria Fabio,
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( Zuli Thaise Ayres Bezerra ) - University of Cuiaba - UNIC School of Dentistry Department of Oral Sciences
( Guedes Orlando Aguirre ) - Centro Universitario de Anapolis - UniEvangelica School of Dentistry Department of Endodontics
( Goncalves Gislaine Figueiredo Zarza Arguello ) - University of Cuiaba - UNIC School of Dentistry Department of Oral Sciences
( da Silva Aurelio Rosa Junior ) - University of Cuiaba - UNIC School of Dentistry Department of Oral Sciences
( Borges Alvaro Henrique ) - University of Cuiaba - UNIC School of Dentistry Department of Oral Sciences
( Aranha Andreza Maria Fabio ) - University of Cuiaba - UNIC School of Dentistry Department of Oral Sciences
Abstract
Objectives: This study investigated the incidence of root dentin defects after the use of different post space preparation (PSP) drills.
Materials and Methods: Seventy-two bovine incisors were selected and obtained 14-mm-long root sections. Twelve roots served as controls with no intervention (G1). The 60 root canals remaining were instrumented using the crown-down technique with the ProTaper Next system and obturated using the lateral condensation technique. Specimens were randomly distributed into 5 groups (n = 12) according to the operative steps performed: G2, root canal instrumentation and filling (I+F); G3, I+F and PSP with Gates-Glidden drills; G4, I+F and PSP with Largo-Peeso reamers; G5, I+F and PSP with Exacto drill; and G6, I+F and PSP with WhitePost drill. Roots were sectioned at 3, 6, 9, and 12 mm from the apex, and digital images were captured. The presence of root dentin defects was recorded. Data were analyzed by the χ2 test, with p < 0.05 considered to indicate statistical significance.
Results: Root dentin defects were observed in 39.6% of the root sections. No defects were observed in G1. G5 had significantly more cracks and craze lines than G1, G2, and G3 (p < 0.05), and more fractures than G1, G2, G3, and G4 (p < 0.05). When all root sections were analyzed together, significantly more defects were observed at the 12-mm level than at the 3-mm level (p < 0.05).
Conclusions: PSP drills caused defects in the root dentin. Gates-Glidden drills caused fewer root defects than Largo-Peeso reamers and Exacto drills.
키워드
Cracks; Dentin defects; Post space preparation; Root canal therapy; Vertical root fracture
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