Feiz Atiyeh, Barekatain Behnaz, Naseri Roohollah, Zarezadeh Hossein, Askari Navid, Nasiri Saman
Dental Materials Research Center and Department of Operative Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.
Dental Implants Research Center and Department of Endodontic, Isfahan University of Medical Sciences, Isfahan, Iran.
Dent Res J (Isfahan). 2013 Nov;10(6):760-3.
Ultrasonic vibrations are used to remove a cemented post from a root canal requiring endodontic retreatment. Various results have been reported from the studies that evaluated the effect of ultrasonic instruments in removing the posts cemented with resin cements. The aim of this study was to evaluate the effect of ultrasonic energy on the retention of prefabricated metal post cemented with Panavia or Maxcem Elite cements.
In this in vitro study, forty eight extracted single root premolars were decoronated with a diamond disc leaving a 13 mm long root and endodontically treated. The root canals were obturated by gutta-percha up to 5 mm with vertical condensation method and the 8 mm post-space was prepared to receive a no. 2 long Dentorama post. The roots were placed in an incubator for 48 h in 37°C and 100% humidity. After mounting the teeth in acrylic blocks, posts were cemented in the root canals using Panavia F2.0 in 24 specimens and Maxcem Elite in 24 others. For half of the specimens in each subgroup, an ultrasonic device was applied for 4 min. Universal testing machine was used to measure the force needed to remove the posts with a crosshead speed of 1 mm/min until the post came out of the canal. Kruskal-Wallis test was used for statistical analysis at 5% level of significance.
The removal force was not significantly different among the groups (P > 0.05).
Ultrasonic energy did not decrease the retention of posts cemented with Panavia or Maxcem Elite cements. Furthermore, it seems that there is no significant difference between removal force of self-etch (Panavia) and the self-etch self-adhesive (Maxcem Elite) resin cements.
超声振动用于从需要进行根管再治疗的根管中取出粘固桩。评估超声器械对去除用树脂粘固剂粘固的桩的效果的研究已报道了各种结果。本研究的目的是评估超声能量对用Panavia或Maxcem Elite粘固剂粘固的预制金属桩固位力的影响。
在这项体外研究中，用金刚石圆盘去除48颗拔除的单根前磨牙的牙冠，保留13 mm长的牙根并进行根管治疗。采用垂直加压法用牙胶将根管充填至5 mm，制备8 mm的桩道以容纳2号长的Dentorama桩。将牙根置于37°C、湿度100%的培养箱中48 h。将牙齿固定在丙烯酸块中后，24个标本的根管内用Panavia F2.0粘固桩，另外24个标本用Maxcem Elite粘固桩。每个亚组的一半标本使用超声设备处理4 min。使用万能试验机以1 mm/min的十字头速度测量取出桩所需的力，直至桩从根管中脱出。采用Kruskal-Wallis检验进行统计学分析，显著性水平为5%。
各组间的脱出力无显著差异（P>0.05）。
超声能量不会降低用Panavia或Maxcem Elite粘固剂粘固的桩的固位力。此外，自酸蚀（Panavia）和自酸蚀自粘固（Maxcem Elite）树脂粘固剂的脱出力似乎没有显著差异。
