Comparative evaluation of instrumentation timing and cleaning efficacy in extracted primary molars using manual and NiTi rotary technique – Invitro study

Abstract

To compare the timing of instrumentation and cleaning efficacy between manual K files and NiTi rotary files in extracted primary molars. Study design: in-vitro study was conducted in 90 root canals of extracted primary molars which were subdivided in three groups viz. Control (No instrumentation), Manual (K files), Rotary (ProFiles) with 30 canals in each group. Mesiobuccal (MB) and Mesiolingual (ML) canals of mandibular molars, and MB and Distobuccal (DB) canals of maxillary molars were included in the test group whereas Distal canals in mandibular molars and Palatal canals in maxillary molars were included in the control group. Method: Teeth were mounted and canals were injected with India ink to stain the canal walls. Canal preparation was done as per the group. After instrumentation, teeth were demounted, decalcified and cleared to make them transparent for scoring according to the extent of removal of India ink. Timing of instrumentation and cleaning efficacy of canals in coronal, middle and apical thirds were assessed in each sample. Results: Mean timing of instrumentation in rotary group was 3.54 ± 1.14 min and 4.32 ± 1.04 min in manual group. Mean cleaning efficacy scores in manual and rotary groups were 2.03 and 1.66 in coronal third, 1.08 and 1.18 in middle third and 0.67 and 1.08 in apical third respectively. Inter-group comparisons showed no statistically significant difference in cleaning efficacy among test groups in all thirds of root canals. Conclusion: NiTi rotary technique has comparable cleaning efficacy, with significantly less timing of instrumentation compared to manual K-files.

Evaluation of Cleaning Efficacy and Instrumentation Time of Manual K- Files and Two Different Rotary Systems (ProTaper Next and Pro AF Rotary Files) in Pulpectomy of Primary Molars: An In Vitro Study

“…In line with our results, Ramazani et al (10) , found that there was no statistically significant difference in cleaning efficacy in the middle third between rotary and manual K-files. In contrast to ours, Mehlawat et al (30) found that manual K-files showed greater effectiveness in cleaning the root canal in the middle third. This might be explained by the fact that rotary files have an increased taper thus they exert minimal pressure in the middle third while engaging more dentine at the coronal part of the canal.…”

“…On the other hand, the stiffer the cross-section of the file used as in the K-files, the more pressure they can apply on the surrounding dentinal walls resulting in higher debridement. This finding was similar to Mehlawat et al (30) , Madan et al (31) , and Silva et al (32) results. However, our findings came in contrast to the results of Moghaddam et al (33) where the cleaning efficacy of the hand files group was noted to be better than the rotary files group.…”

Uso de sistemas rotatórios no tratamento endodôntico em odontopediatria

“…Um outro ponto a ser abordado sobre o preparo mecânico das limas rotatórias diz respeito à eficácia de limpeza dos canais radiculares dos dentes decíduos. Mehlawat et al, (2019) e Ramazani et al, (2016) evidenciaram uma boa qualidade de limpeza dos canais tratados com sistemas rotatórios, sendo semelhante aos manuais. Entretanto, o estudo de Rathi et al, (2021) informou que as limas endodônticas expelem uma certa quantidade de detritos para a região periapical dos canais, porém, esses detritos devem ser mínimos, pois pode causar efeitos tóxicos no germe dentário permanente.…”

Torsional Resistance of Two New Heat Treated Nickel Titanium Rotary Instruments: An in Vitro Evaluation

“…The introduction of nickel-titanium (NiTi) rotary instruments in endodontics improved the quality of root canal treatments (RCTs), in terms of shaping and cleaning of root canals [1]. Despite the superior qualities of the nickel-titanium alloy compared to the traditional Stainless-Steel instruments, the risk of unexpected intracanal separation could still occur [2,3].…”