Department of Pediatric and Preventive Dentistry, Saveetha Dental College, Chennai, Tamil Nadu, India.
Department of Preventive Dental Sciences, Division of Pediatric Dentistry, College of Dentistry, Jazan University, Jazan, Saudi Arabia.
Niger J Clin Pract. 2022 Oct;25(10):1681-1686. doi: 10.4103/njcp.njcp_71_22.
In a pulpectomy, the eradication of microbes from the primary root canal is accomplished through biomechanical preparation, which could be carried out with either manual or rotary instruments.
The objective of this clinical trial was to evaluate the efficiency of manual K-files, H-files, and Kedo-S Square rotary files in reducing microbial flora after canal preparation in primary molars.
This randomized clinical trial consisted of 45 primary molars requiring pulpectomy. The teeth were randomly allocated to one of the three groups: Group I: Manual K-files, Group II: Manual H-files, and Group III: Kedo-S Square rotary files, based on the type of instrumentation. Pre-and Post-instrumentation sampling was performed using clean absorbent paper points and kept in a clean Eppendorf tube having thioglycolate broth as the transport medium. Culturing was performed on agar media from which both aerobic and anaerobic microbial counts were estimated. Collected data were statistically analyzed using one-way analysis of variance (ANOVA) and Wilcoxon signed-rank test. Following root canal preparation, 87-89% reduction of the aerobic and anaerobic microbial load was noted in group I, whereas it was an 89-92% reduction in group II and a 93-95% reduction in group III.
Biomechanical preparation with Kedo-S Square rotary file showed higher efficacy in microbial reduction compared to manual instrumentation.
Manual and rotary files were equally effective in removing root canal microbes. Biomechanical preparation with a KedoS Square rotary file resulted in greater microbial efficacy. Hence In children, effective root canal cleaning in a short period of time is a major consideration.
在牙髓切除术，通过生物力学预备从主根管中消灭微生物，这可以通过手动或旋转器械完成。
本临床试验的目的是评估手动 K 锉、H 锉和 Kedo-Square 旋转锉在减少乳牙根管预备后微生物群的效率。
这项随机临床试验包括 45 颗需要牙髓切除术的乳牙。根据器械类型，将牙齿随机分配到三组之一：I 组：手动 K 锉、II 组：手动 H 锉和 III 组：Kedo-Square 旋转锉。在预备前后，使用清洁的吸收性纸尖进行采样，并将其保存在装有巯基醋酸盐肉汤的清洁 Eppendorf 管中作为运输介质。在琼脂培养基上进行培养，从该培养基中估计有氧和厌氧微生物计数。使用单向方差分析（ANOVA）和 Wilcoxon 符号秩检验对收集的数据进行统计分析。根管预备后，I 组的需氧和厌氧微生物负荷减少了 87-89%，而 II 组减少了 89-92%，III 组减少了 93-95%。
与手动器械相比，Kedo-Square 旋转锉的生物力学预备显示出更高的微生物减少效果。
手动和旋转锉在去除根管微生物方面同样有效。Kedo-Square 旋转锉的生物力学预备可产生更大的微生物效果。因此，在儿童中，在短时间内有效清洁根管是一个主要考虑因素。
