Kummer Thais Regina, Calvo Maria Cristina, Cordeiro Mabel Mariela Rodríguez, de Sousa Vieira Ricardo, de Carvalho Rocha Maria José
Brazil School of Dentistry, Federal University of Santa Catarina, Florianópolis, Santa Catarina.
Oral Surg Oral Med Oral Pathol Oral Radiol Endod. 2008 Apr;105(4):e84-92. doi: 10.1016/j.tripleo.2007.12.008.
This study aimed to evaluate, ex vivo, time and dentin removal by manual and rotary instrumentation in human primary teeth.
Eighty primary teeth were divided into 2 groups, embedded in resin, and sectioned for evaluation before and after instrumentation. For manual technique, teeth were prepared using K-type files and rotary preparation was performed with Hero 642. All root canals were prepared up to size 40, and the instrumentation time was recorded. Dentin removal was calculated using digital image software. Data was statistically analyzed using chi-squared, Mann-Whitney, and t tests.
Manual instrumentation removed more dentin in all groups compared with rotary instrumentation (P < .05). In some specimens, root perforations were observed in areas coinciding with largest root resorption. Rotary technique showed the shortest instrumentation time (P < .05).
Deciduous teeth, without significant root resorption, have enough root structure for instrumentation up to size 40. Rotary technique required less time and generated less dentin removal.
本研究旨在体外评估手工和旋转器械在人类乳牙根管预备中的时间及牙本质去除量。
80颗乳牙分为2组，嵌入树脂中，在器械预备前后进行切片评估。手工技术使用K型锉进行预备，旋转预备使用Hero 642。所有根管均预备至40号，记录器械预备时间。使用数字图像软件计算牙本质去除量。数据采用卡方检验、曼-惠特尼检验和t检验进行统计学分析。
与旋转器械相比，手工器械在所有组中去除的牙本质更多（P < .05）。在一些标本中，在与最大牙根吸收区域一致的部位观察到根管侧穿。旋转技术显示器械预备时间最短（P < .05）。
无明显牙根吸收的乳牙具有足够的牙根结构以进行40号的器械预备。旋转技术所需时间更少，去除的牙本质也更少。
