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Dentinal microcracks and cemental tears related to chemo‐mechanical root canal instrumentation: a micro‐CT Cadaver Study

Tan, VL ; Hardiman, R ; Pilbrow, V ; Parashos, P

Australian dental journal, 2022-03, Vol.67 (1), p.76-82 [Periódico revisado por pares]

Australia

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  • Título:
    Dentinal microcracks and cemental tears related to chemo‐mechanical root canal instrumentation: a micro‐CT Cadaver Study
  • Autor: Tan, VL ; Hardiman, R ; Pilbrow, V ; Parashos, P
  • Assuntos: Cadaver ; Cemental defects ; Dental Pulp Cavity ; Dentin ; histology ; Humans ; microcracks ; radicular defects ; Root Canal Preparation - adverse effects ; Root Canal Therapy ; X-Ray Microtomography
  • É parte de: Australian dental journal, 2022-03, Vol.67 (1), p.76-82
  • Notas: ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
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  • Descrição: Background The prevalence of radicular defects after root canal instrumentation is unresolved. This study used micro‐CT to assess the relationship between the formation of radicular defects and chemo‐mechanical instrumentation in a cadaver model. Methods Maxillary and mandibular molars (n = 24) were sectioned from cadaver specimens as a tissue block containing the teeth, alveolar bone and attached mucogingival tissues. After a baseline micro‐CT scan (13.45 μm), the specimens were distributed into 3 groups (n = 8 molars): Reciproc®, ProTaper Next™ and Mtwo®. Micro‐CT scans of each specimen were obtained after access, glide path and preparation with each instrument. The pre‐operative and final post‐operative micro‐CT cross‐sectional images of the roots were screened by two blinded examiners to identify any pre‐existing and new radicular defects. Pre‐existing and new radicular defects were examined histologically. Results Overall, 16 pre‐existing radicular defects were identified in 12 of the 24 molars (50%). Most of these were cemental tears (87.5%), and not true dentinal microcracks. New dentinal microcracks were observed in the post‐operative micro‐CT scans of only 3 canals (3.9%; 3/77). However, only one of these defects was found to be present histologically. Conclusions Within the limitations of the study, chemo‐mechanical instrumentation did not routinely promote the formation of radicular defects.
  • Editor: Australia
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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