Deshpande Anshula Neeraj, Joshi Neelam Hasmukhbhai, Naik Kishan S
Department of Paedodontics and Preventive Dentistry, K. M. Shah Dental College and Hospital, Sumandeep Vidyapeeth, Vadodara, Gujarat, India.
Contemp Clin Dent. 2017 Jan-Mar;8(1):33-37. doi: 10.4103/0976-237X.205064.
Pulpectomy of primary teeth is mostly carried out with hand files and broaches which is tricky and time consuming procedure. The development of new design features like varying tapers, non-cutting safety tips and varying length of cutting blades have resulted in new generation of rotary instruments.
To compare and evaluate cleaning efficacy, canal preparation and volumetric filling using conventional files and rotary V Taper files through cone beam computed tomography.
Thirty extracted primary molars were selected. The teeth were randomly divided into three groups each containing 10 teeth i.e. 30 canals in each group. Group A was instrumented with K files; Group B rotary V Taper files and Group C was Hybrid group. Sodium hypochlorite (1%) was used for irrigation. Root canal filling was done with Zinc Oxide Eugenol cement in all groups. The volumetric analysis i.e. Percentage of Volume (POV) of the root canal filling in primary molars was done through CBCT Software.
In present study, p- value was found to be significant (<0.05). Almost 100% of canals of hybrid group were fully filled and 63.3% of canals of hand filing group were partially filled. The filling was found to be dense and no. of voids was least in hybrid group.
Clinical time required in primary molar endodontics, especially with unpredictability and difficulty of canal morphology, is inevitable. The study confirms superior ability of rotary-file systems to shape severely curved canals with less time and significant decrease in procedural errors like partial filling, voids and inappropriate canal preparation.
乳牙牙髓摘除术大多使用手用锉和拔髓针进行，这是一个棘手且耗时的过程。诸如不同锥度、无切割安全头以及不同切割刃长度等新设计特点的出现，催生了新一代旋转器械。
通过锥形束计算机断层扫描，比较和评估使用传统锉和旋转V型锥度锉进行根管清理、根管预备和体积充填的效果。
选取30颗拔除的乳牙磨牙。将牙齿随机分为三组，每组10颗牙齿，即每组30个根管。A组使用K锉进行根管预备；B组使用旋转V型锥度锉；C组为混合组。使用1%的次氯酸钠进行冲洗。所有组均使用氧化锌丁香油粘固剂进行根管充填。通过CBCT软件对乳牙根管充填的体积分析，即根管充填体积百分比（POV）进行测定。
在本研究中，p值具有显著性（<0.05）。混合组几乎100%的根管完全充填，手用锉组63.3%的根管部分充填。发现混合组的充填致密，空隙数量最少。
乳牙牙髓病治疗所需的临床时间，尤其是考虑到根管形态的不可预测性和难度，是不可避免的。该研究证实了旋转锉系统在塑造严重弯曲根管方面具有卓越能力，用时更少，且能显著减少诸如部分充填、空隙和不适当根管预备等操作失误。
