Suneetha Matam Glore, Moiz Ahmed Abdul, Sharief Hateem, Yedla Kalyani, Baig Mubashir Mirza, Abu Al Qomsan Mohammed Ali Salem
Department of Conservative Dentistry and Endodontics, Government Area Hospital Golconda, Hyderabad, Telangana, India.
Department of Conservative Dentistry and Endodontics, Smile Dental Hospital, Hyderabad, Telangana, India.
J Indian Soc Pedod Prev Dent. 2020 Jan-Mar;38(1):48-55. doi: 10.4103/JISPPD.JISPPD_190_19.
Residual root dentin thickness (RDT) in endodontically treated teeth is a major factor that is responsible for longevity of treated tooth.
To evaluate and compare the amount of RDT during endodontic treatment using manual K-files and rotary Mtwo, ProTaper Next, and Hero shaper instruments.
Anin vitro study was carried out on a sample of 100 freshly extracted human single straight rooted mandibular first premolar teeth.
The teeth were divided into five groups of twenty each and mounted on wax rims for a preoperative cone beam computed tomography scan to calculate the dentin thickness 3 and 6 mm from the apex. All the teeth were treated according to their groups.
The observations were then statistically analyzed using one-way ANOVA to evaluate the difference among four groups followed by post hoc test for pairwise comparison.
Maximum preservation of dentin was seen in Group V (cleaning and shaping done with rotary Hero shaper files) at 3 and 6 mm from the apex, whereas minimum preservation of dentin was seen in Group IV at 3 mm (cleaning and shaping done with rotary ProTaper Next files) and Group II at 6 mm (cleaning and shaping done with hand K-stainless steel files) from the apex. Overall there was a statistically significant difference in RDT values between Group V and Groups I, II, III, IV both at 3 and 6 mm from the apex.
Cleaning and shaping with rotary Hero shaper files preserved more amount of dentin when compared to hand K-files, rotary Mtwo, ProTaper Next.
根管治疗后牙齿的剩余牙根牙本质厚度（RDT）是决定治疗后牙齿寿命的主要因素。
评估并比较使用手动K锉以及旋转器械Mtwo、ProTaper Next和Hero成型锉进行根管治疗期间的RDT量。
对100颗新鲜拔除的人下颌第一前磨牙单根牙样本进行体外研究。
将牙齿分为五组，每组20颗，安装在蜡圈上进行术前锥形束计算机断层扫描，以计算距根尖3毫米和6毫米处的牙本质厚度。所有牙齿均按组进行治疗。
然后使用单因素方差分析对观察结果进行统计分析，以评估四组之间的差异，随后进行事后检验以进行两两比较。
在距根尖3毫米和6毫米处，第五组（使用旋转Hero成型锉进行清洁和塑形）的牙本质保存量最大，而在距根尖3毫米处的第四组（使用旋转ProTaper Next锉进行清洁和塑形）和距根尖6毫米处的第二组（使用手动K不锈钢锉进行清洁和塑形）的牙本质保存量最小。总体而言，在距根尖3毫米和6毫米处，第五组与第一、二、三、四组的RDT值在统计学上存在显著差异。
与手动K锉、旋转Mtwo、ProTaper Next相比，使用旋转Hero成型锉进行清洁和塑形可保留更多的牙本质。
