Musale P K, Mujawar S A V
Department of Paedodontics and Preventive Dentistry, M. A. Rangoonwala College of Dental Sciences and Research Centre, Azam Campus, K. B. Hidayatulla Road, Camp, Pune, 411001, MS, India,
Eur Arch Paediatr Dent. 2014 Apr;15(2):113-20. doi: 10.1007/s40368-013-0072-1. Epub 2013 Jul 27.
This in vitro study aimed to evaluate the efficacy of rotary ProFile, ProTaper, Hero Shaper and K-files in shaping ability, cleaning efficacy, preparation time and instrument distortion in primary molars.
Sixty extracted primary mandibular second molars were divided into four equal groups: Group I K-file, Group II ProFile, Group III ProTaper file and Group IV Hero Shaper file. The shaping ability was determined by comparing pre- and post-instrumentation CBCT scans and data analysed with SPSS program using the Chi-square test. Cleaning efficacy was evaluated by the degree of India ink removal from the canal walls under stereomicroscopy. Instrumentation times were calculated for each tooth and instrument distortion was visually checked and duly noted. The cleaning efficacy and instrumentation time were determined using ANOVA with Tukey's correction. Instrument distortion was analysed using Chi-square test.
The canal taper was significantly more conical for rotary files as compared to K-files with Chi-square test (p < 0.05). Cleaning efficacy of rotary files with average scores (Groups II- 0.68, III- 0.48 and IV- 0.58) was significantly better than K-files (Group I- 0.93) (p < 0.05). Mean instrumentation time with K-file (20.7 min) was significantly higher than rotary files (Groups II 8.9, III 5.6, and IV 8.1 min) (p < 0.05). Instrument distortion was observed in Group I (4.3%), while none of the rotary files were distorted.
Rotary files prepared more conical canals in primary teeth than manual instruments. Reduced preparation time with rotary files enhances patient cooperation especially in young children.
本体外研究旨在评估旋转ProFile、ProTaper、Hero Shaper和K锉在乳牙根管预备能力、清洁效果、预备时间和器械变形方面的效果。
60颗拔除的下颌乳第二磨牙被分为四组，每组15颗：第一组为K锉组，第二组为ProFile组，第三组为ProTaper锉组，第四组为Hero Shaper锉组。通过比较根管预备前后的锥形束CT扫描来确定根管预备能力，并使用SPSS软件通过卡方检验对数据进行分析。在体视显微镜下通过根管壁上印度墨水的去除程度来评估清洁效果。计算每颗牙齿的预备时间，并目视检查器械变形情况并做好记录。使用方差分析及Tukey校正来确定清洁效果和预备时间。使用卡方检验分析器械变形情况。
通过卡方检验，与K锉相比，旋转锉预备的根管锥度明显更呈圆锥形（p < 0.05）。旋转锉的清洁效果平均得分（第二组-0.68、第三组-0.48和第四组-0.58）明显优于K锉（第一组-0.93）（p < 0.05）。K锉的平均预备时间（20.7分钟）明显长于旋转锉（第二组8.9分钟、第三组5.6分钟和第四组8.1分钟）（p < 0.05）。第一组观察到器械变形（4.3%），而旋转锉均未变形。
与手动器械相比，旋转锉在乳牙中预备出的根管更呈圆锥形。旋转锉缩短了预备时间，尤其增强了幼儿患者的配合度。
