Post Letícia Kirst, Lima Fábio Garcia, Xavier Cristina Braga, Demarco Flávio Fernando, Gerhardt-Oliveira Marília
Dental School, Federal University of Pelotas, Santa Maria, RS, Brazil.
Braz Dent J. 2010;21(5):416-9. doi: 10.1590/s0103-64402010000500007.
This in vitro study evaluated the effect of different apicoectomy angles, instruments used in root-end preparation, and dental materials used in retrofilling on apical sealing. Root ends were resected at 45 or 90 degrees in 80 single-rooted teeth. For each type of apicoectomy, root-end cavities were prepared with either a round carbide #2 bur or an S12/90D ultrasonic tip. The root-end cavities in each subgroup (apicoectomy + root-end preparation) were filled with silver amalgam without zinc (Am) or with gray mineral trioxide aggregate -Angelus (MTA), and the specimens were immediately immersed in 0.2% rhodamine B for 24 h. Sealing was evaluated based on the dyed cross-sectional dentin area. Data were analyzed statistically by the Kruskal-Wallis test at 5% significance level. No group showed complete sealing of root-end areas. The only significant factor affecting microleakage was dental material, with MTA exhibiting less leakage.
这项体外研究评估了不同根尖切除术角度、根尖预备中使用的器械以及根尖倒充填中使用的牙科材料对根尖封闭的影响。在80颗单根牙中，根尖以45度或90度进行切除。对于每种根尖切除术类型，使用2号圆形硬质合金车针或S12/90D超声尖制备根尖洞。每个亚组（根尖切除术+根尖预备）中的根尖洞用无锌银汞合金（Am）或灰色天使牌矿物三氧化物聚合体（MTA）充填，标本立即浸入0.2%罗丹明B中24小时。根据染色的牙本质横断面面积评估封闭情况。数据采用Kruskal-Wallis检验进行统计学分析，显著性水平为5%。没有一组显示根尖区域完全封闭。影响微渗漏的唯一显著因素是牙科材料，MTA的渗漏较少。
