%0 Journal Article
%T Effects of increasing instrument size and taper on the disinfection and shaping of mandibular incisors.
%A Barbosa AFA
%A Silva EJNL
%A Versiani MA
%A Lima CO
%A Oliveira LAPR
%A Massa GDS
%A Eustáquio TCDS
%A Lopes RT
%A Sassone LM
%J Aust Endod J
%V 50
%N 2
%D 2024 Aug 8
%M 38715465
%F 1.719
%R 10.1111/aej.12851
%X This study assessed canal preparation effects on disinfection and dentin preservation. Thirty mandibular incisors were paired into two experimental groups (n = 10). Following contamination, the initial microbial sample was collected. Instruments 30/0.03 (Group 1) and 30/0.05 (Group 2) were employed and a second sample was obtained. Canals were enlarged using instruments 40/0.03 and 40/0.05, respectively, and a third sample was collected. Final irrigation was performed, and sample S4 obtained. A final scan evaluated volume, surface area, unprepared areas, removed dentin and dentin thickness. Data were analysed using Student t-test, Mann-Whitney, Kruskal-Wallis and Dunn tests. A significant difference was observed between S1 and other time points (p < 0.05). Comparison between groups showed no differences in bacterial loads and in the percentage of microbial reduction (p > 0.05). Group 2 exhibited greater reduction in dentin thickness than group 1 in the mesial aspect of the root (p < 0.05). Instrument 30/0.03 might provide effective disinfection and safety during mandibular incisors canal preparation.