da Silva Machado Ana Paula, Câncio Couto de Souza Antônio Caetano, Lima Gonçalves Tamille, Franco Marques André Augusto, da Fonseca Roberti Garcia Lucas, Antunes Bortoluzzi Eduardo, Acris de Carvalho Fredson Márcio
Superior School of Health Sciences, State University of Amazonas, Manaus, AM, Brazil.
School of Dentistry, Federal University of Amazonas, Manaus, AM, Brazil.
Clin Oral Investig. 2021 Jul;25(7):4401-4406. doi: 10.1007/s00784-020-03752-0. Epub 2021 Jan 3.
To evaluate if the ultrasonic activation of sealer hinders the root canal retreatment.
Thirty mandibular premolars were prepared using the ProTaper Universal system (Dentsply) until the instrument F3 (0.30/0.09). The canals were distributed into 2 groups (n = 15), according to the filling technique: NUact group - sealer without ultrasonic activation + gutta-percha cones and Uact group - sealer with ultrasonic activation + gutta-percha cones. The canals were re-instrumented with Largo burs, followed by the instrument R50 (0.50/0.05) of the Reciproc system. The time required to perform re-instrumentation was recorded (s). The roots were longitudinally cleaved, and the total area of root canal and remaining filling material were quantified (%). The ANOVA test was applied to the data and complemented by Student's t test (P < 0.05).
Uact group had higher percentage of remaining filling material than NUact group (P < 0.05). When the root thirds were considered, there was statistically significant difference only for Uact group at the apical third (P < 0.05). There was no difference between groups regarding the time required to perform re-instrumentation (P > 0.05).
Ultrasonic activation of sealer leads to a higher percentage of remaining filling material attached to the root canal walls. However, it did not affect the retreatment time.
Ultrasonic activation increases sealer penetration into dentinal tubules, improving its resistance to dislodgement. However, there is no scientific evidence to prove if ultrasonic activation of sealer hinders its removal when root canal retreatment is necessary.
评估封闭剂的超声激活是否会妨碍根管再治疗。
使用ProTaper Universal系统（登士柏公司）预备30颗下颌前磨牙，直至使用F3器械（0.30/0.09）。根据充填技术将根管分为2组（n = 15）：NUact组 - 未超声激活的封闭剂 + 牙胶尖，Uact组 - 超声激活的封闭剂 + 牙胶尖。使用Largo车针重新预备根管，随后使用Reciproc系统的R50器械（0.50/0.05）。记录重新预备所需的时间（秒）。将牙根纵向劈开，对根管总面积和剩余充填材料进行定量分析（%）。对数据应用方差分析，并辅以学生t检验（P < 0.05）。
Uact组剩余充填材料的百分比高于NUact组（P < 0.05）。当考虑牙根的三个部分时，仅Uact组在根尖三分之一处有统计学显著差异（P < 0.05）。两组在重新预备所需时间方面无差异（P > 0.05）。
封闭剂的超声激活导致附着在根管壁上的剩余充填材料百分比更高。然而，它并未影响再治疗时间。
超声激活可增加封闭剂渗入牙本质小管，提高其抗脱位能力。然而，尚无科学证据证明在需要进行根管再治疗时，封闭剂的超声激活是否会妨碍其去除。
