Premium
Root dentine thickness in C‐shaped lower second molars after instrumentation: A CBCT and micro‐CT study
Author(s) -
Martin Gabriela,
Arce Brissón Georgette,
Chen Binwen,
Noemí de Caso Cecilia,
Boetto Ana Cecilia,
Jacobo María Inés,
Higa Romina,
Braschi Silvia Marta,
Marchegiani Silvio,
Monsalvo Andrés,
Shen Ya,
Haapasalo Markus
Publication year - 2021
Publication title -
australian endodontic journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.703
H-Index - 34
eISSN - 1747-4477
pISSN - 1329-1947
DOI - 10.1111/aej.12509
Subject(s) - molar , perforation , instrumentation (computer programming) , root canal , dentistry , materials science , cone beam computed tomography , orthodontics , medicine , computed tomography , radiology , composite material , computer science , punching , operating system
Stripping perforation is a possible complication in instrumentation of C‐shaped canals. This study evaluated the minimum thickness of the root canal wall in C‐shaped teeth after instrumentation. Twelve extracted C‐shaped mandibular second molars (four teeth of type I, II and III each) were examined by CBCT (voxel size 90 μm) before and after instrumentation with WOG primary file. Micro‐CT scans (voxel size 30 μm) were obtained after instrumentation. Percentage of canal wall area touched by the file and minimum thickness of dentine were measured and compared between CBCT and micro‐CT. In type I C‐shape canals, less than 10% of the canal wall area was touched by the instrument. In ten teeth, the shortest distance to root surface was from the instrumented area; no perforations occurred. CBCT and micro‐CT measurements were in good agreement in ten cases; in two teeth, micro‐CT revealed considerably shorter distance to root surface. The two shortest distances were 0.27 and 0.41 mm.