Boda Kendra K, Bowles Walter R, McClanahan Scott B
University of Minnesota School of . Dentistry, Minneapolis, Minnesota, USA.
Northwest Dent. 2013 May-Jun;92(3):21-5.
To investigate the sealing ability of Roth 801 sealer mixed using two different powder/liquid ratios and prepared up to seven days prior to canal obturation.
Of the 152 maxillary anterior teeth endodontically instrumented for this study, 144 were randomly assigned to the treatment group, and eight were assigned to the control group. Of the 144 teeth in the treatment group, 72 were obturated using gutta-percha and Roth 801 sealer mixed with a 10:1 ratio, while the remaining 72 were obturated with a sealer ratio of 7.5:1. Within both treatment groups, the teeth were further subdivided into six groups of 12 teeth based upon the amount of time between sealer mixing and canal obturation, which varied from 0 days to seven days. Teeth were analyzed with fluid filtration either immediately after obturation or 14 weeks after obturation. The data were analyzed using a three-way analysis of variance.
For teeth tested at the time of obturation, leakage decreased for older sealer, p < 0.0001. After the 14-week storage period, there was no significant difference in leakage. No significant differences were noted between either powder/liquid ratios.
Pre-mixed Roth 801 sealer maintained an apical seal when prepared up to seven days prior to canal obturation. Varying the powder/liquid ratio of Roth 801 sealer did not significantly affect the apical seal.
研究两种不同粉液比混合且在根管充填前制备长达7天的Roth 801封闭剂的封闭能力。
在本研究中，对152颗上颌前牙进行根管预备，其中144颗随机分配至治疗组，8颗分配至对照组。治疗组的144颗牙中，72颗使用牙胶尖和粉液比为10:1混合的Roth 801封闭剂进行充填，其余72颗使用粉液比为7.5:1的封闭剂进行充填。在两个治疗组内，根据封闭剂混合与根管充填之间的时间间隔，将牙齿进一步细分为6组，每组12颗牙，时间间隔从0天到7天不等。在充填后即刻或充填后14周对牙齿进行液体过滤分析。数据采用三因素方差分析。
对于充填时测试的牙齿，较陈旧的封闭剂渗漏减少，p<0.0001。在14周储存期后，渗漏无显著差异。两种粉液比之间均未观察到显著差异。
预混合的Roth 801封闭剂在根管充填前制备长达7天时能保持根尖封闭。改变Roth 801封闭剂的粉液比对根尖封闭无显著影响。
