Abstract
This study measured the thickness of cementum/dentin in the danger zone of the mandibular molars after root canal preparation using novel cone-beam computed tomography (CBCT) software. Eighty-four teeth were distributed into four groups: ProTaper Next, BioRace, Reciproc Blue, and WaveOne Gold. E-Vol DX® CBCT software was used to measure initial and final remaining cementum-dentin thicknesses after root canal preparation of the mesial root of mandibular molars at 1 and 3 mm from the furcation. The Kolmogorov-Smirnov test was used to test variable symmetry. The variables were described as mean and standard deviations, compared among the groups using analysis of variance (ANOVA), and within the groups using the Student t test. A generalized estimating equation model was used to compare the variation before and after root canal preparation. The level of significance was set at 5%. Differences between mean initial and final thicknesses of the mesiobuccal (MB) and mesiolingual (ML) canals were not statistically significant. The mean initial thickness was 3 mm (0.900 mm ± 0.191), considering that a mean lower than 1 mm (1.035 mm ± 0.184) indicates the danger zone. Although cementum/dentin is thinner at 3 mm from the furcation (0.715±0.186) after root canal preparation, the greatest amount of dentin removed was found at 1 mm (0.734 ± 0.191). The cementum-dentin remaining after preparation was thicker than 0.715 mm in root canals prepared using #35 (WaveOne Gold®) and #40 (ProTaper Next®, BioRace® and Reciproc Blue®) instruments. This confirms the safety of canal preparation in the danger zone using these systems.
Highlights
Root canal preparation is indubitably a valuable stage of cleaning and shaping
Sample selection This study included 210 human first and second mandibular molars extracted for different reasons from adult patients seen at the School of Dentistry of the Federal University of Goiás, Brazil
The mean cementum-dentin thickness was greater than 0.670 mm at 1 and 3 mm from the furcation after preparation of the mesial roots of the mandibular molars using ProTaper ®, BioRace®, Reciproc Blue®, and WaveOne Gold® NiTi instruments #35 to #40
Summary
Root canal preparation is indubitably a valuable stage of cleaning and shaping. endodontic treatment failure at this stage may be associated with operative errors that could result in ledges, perforation, canal decentralization, and apical transportation in curved canals.[1,2]Nickel-titanium (NiTi) endodontic instruments are used in continuous rotation or reciprocating motion, and are manufactured with a special metal alloy and file designs that ensure the root canal will be preservedBraz. Root canal preparation is indubitably a valuable stage of cleaning and shaping. Endodontic treatment failure at this stage may be associated with operative errors that could result in ledges, perforation, canal decentralization, and apical transportation in curved canals.[1,2]. Nickel-titanium (NiTi) endodontic instruments are used in continuous rotation or reciprocating motion, and are manufactured with a special metal alloy and file designs that ensure the root canal will be preserved
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