Fenigstein Matthew, Askar Mazin, Maalhagh-Fard Ahmad, Paurazas Susan
Graduate Endodontics, University of Detroit Mercy School of Dentistry, Detroit, MI 48208, USA.
Division of Clinical Dentistry, University of Detroit Mercy School of Dentistry, Detroit, MI 48208, USA.
Dent J (Basel). 2025 May 26;13(6):234. doi: 10.3390/dj13060234.
: The removal of a fiber post (FP) during endodontic retreatment can be the source of significant complications. This study evaluated two commonly used techniques in removing a fiber post from an endodontically treated tooth by investigating three metrics: volume of dentin removed, efficiency, and temperature increase. : Thirty extracted, single-rooted teeth were decoronated at the CEJ, then underwent endodontic treatment and post-space preparation. Fiber posts were bonded within the canal space. Teeth were pair-matched and randomly assigned to undergo post removal via Munce bur (MB) or diamond-coated ultrasonic tip (US). Teeth were scanned with micro-CT prior to post placement and after post removal. : The volume of dentin removal was not statistically significant between groups ( > 0.05), but the Munce bur resulted in eccentric removal patterns. There was a statistically significant difference in the time required to remove the fiber post between MB and US ( < 0.05). Removal of a fiber post with a Munce bur took an average of 58 s. Removal of a fiber post with an ultrasonic tip took an average of 502 s. There was no statistically significant difference in maximum temperature generated during post removal between MB and US ( > 0.05). : Removal of a FP with a Munce bur requires significantly less time when compared to using an ultrasonic tip, with reduced risk of generating excessive heat for either technique with adequate coolant. US can stay more centered in the canal during FP removal when compared to Munce burs, potentially reducing unfavorable outcomes.
在根管再治疗过程中取出纤维桩（FP）可能会引发严重并发症。本研究通过调查三个指标：牙本质去除量、效率和温度升高，评估了两种从根管治疗后的牙齿中取出纤维桩的常用技术。
30颗拔除的单根牙在牙冠颈缘处截冠，然后进行根管治疗和桩道预备。纤维桩粘结于根管内。将牙齿配对并随机分组，分别采用Munce钻（MB）或金刚石涂层超声尖（US）进行桩取出操作。在放置纤维桩前及取出后，用显微CT对牙齿进行扫描。
两组之间牙本质去除量无统计学差异（>0.05），但Munce钻导致牙本质去除模式偏心。MB和US在取出纤维桩所需时间上存在统计学显著差异（<0.05）。用Munce钻取出纤维桩平均耗时58秒。用超声尖取出纤维桩平均耗时502秒。MB和US在取出纤维桩过程中产生的最高温度无统计学显著差异（>0.05）。
与使用超声尖相比，用Munce钻取出纤维桩所需时间显著更少，在有足够冷却液的情况下，两种技术产生过多热量的风险均降低。与Munce钻相比，US在取出纤维桩时能更居中于根管内，可能减少不良后果。
