Sokhi Rithima R, Sumanthini M V, Shenoy Vanitha U, Bodhwani Mohit A
Lecturer, Department of Conservative Dentistry and Endodontics, MGM Dental College and Hospital , Navi Mumbai, Maharashtra, India .
Professor, Department of Conservative Dentistry and Endodontics, MGM Dental College and Hospital , Navi Mumbai, Maharashtra, India .
J Clin Diagn Res. 2017 Jan;11(1):ZC75-ZC79. doi: 10.7860/JCDR/2017/22834.9202. Epub 2017 Jan 1.
Calcium Hydroxide (CH) is one of the most commonly used intracanal medicaments which can be used with various vehicles.
The aim of this in vitro study was to evaluate the effect of three CH based intracanal medicaments on the apical sealing ability of AH Plus - guttapercha obturation.
Crowns of 100 extracted single rooted human teeth were sectioned at the Cemento-Enamel Junction (CEJ) to a standardized length. The root canals were instrumented upto ISO size 40 using step back technique and the specimens were randomly divided into two control and four experimental groups. The control groups were not medicated. Specimens in positive control group (Group I) were obturated with guttapercha without placing sealer and in negative control group (Group II) were obturated with guttapercha and AH Plus sealer. Among the experimental groups, specimens of Group III were not medicated while groups IV, V and VI were medicated with CH-saline, CH-2% Chlorhexidine (CHX) and Vitapex respectively for a period of 14 days. The medicaments were removed from the specimens and the teeth were obturated with AH Plus sealer and guttapercha using lateral compaction technique. The specimens were immersed in India ink dye, demineralized and diphanized. The extent of dye penetration was assessed using a 10X stereomicroscope. Data obtained was statistically analyzed by one-way ANOVA (p<0.05) followed by Post-hoc Tukey test.
Amongst the three CH medicaments, CH-2% CHX when used as an intracanal medicament showed a significantly higher microleakage as compared to the other groups with p<0.001. The microleakage values between the remaining groups were not statistically significant.
Under the conditions of this study it was concluded that all groups with or without intracanal medicament showed apical leakage. The vehicle used to carry CH may significantly influence the apical sealing ability of guttapercha - AH Plus obturated canals.
氢氧化钙（CH）是最常用的根管内药物之一，可与多种载体配合使用。
本体外研究的目的是评估三种基于CH的根管内药物对AH Plus - 牙胶尖充填根尖封闭能力的影响。
将100颗拔除的单根人牙在牙骨质 - 釉质界（CEJ）处截断至标准长度。采用逐步后退技术将根管预备至ISO 40号，将标本随机分为两个对照组和四个试验组。对照组不进行药物处理。阳性对照组（第一组）的标本用牙胶尖充填但不放置封闭剂，阴性对照组（第二组）的标本用牙胶尖和AH Plus封闭剂充填。在试验组中，第三组标本不进行药物处理，而第四、五、六组分别用CH - 生理盐水、CH - 2%氯己定（CHX）和Vitapex药物处理14天。从标本中去除药物，然后使用侧向加压技术用AH Plus封闭剂和牙胶尖对牙齿进行充填。将标本浸入印度墨水中，脱矿并透明化处理。使用10倍体视显微镜评估染料渗透程度。所获数据采用单因素方差分析（p<0.05）进行统计学分析，随后进行事后Tukey检验。
在三种CH药物中，当CH - 2% CHX用作根管内药物时，与其他组相比，微渗漏显著更高，p<0.001。其余组之间的微渗漏值无统计学意义。
在本研究条件下得出结论，所有使用或未使用根管内药物的组均显示根尖渗漏。用于携带CH的载体可能会显著影响牙胶尖 - AH Plus充填根管的根尖封闭能力。
