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Removing Calcium Hydroxide Dressing from Apical Third of the Root Canal By Using Irrigation Needles and EndoVac method (In Vitro)

إزالة ضماد ماءات الكالسيوم من الثلث الذروي من القناة الجذرية مخبرياً باستخدام طريقة إبر الإرواء و الشفط الذروي

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 Publication date 2016
and research's language is العربية
 Created by Shamra Editor




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Aim of Study: The antimicrobial intracanal medication was used widely, and the most common was calcium hydroxide dressing, which must be removed from the root canal before obturation, hence this study aimed to comparative efficacy of EndoVac and NaviTip 30 G irrigation Needles with Naocl and CHX 2% in removing calcium hydroxide dressing from the apical third of root canal. Materials &Methods: Forty single root and canal teeth were decoronated to the length of 16 mm. Each root was prepared to the apical foramen using ProTaper Universal Hand System to size 40. Each tooth was embedded in silicone putty to create a set matrix, which allowed reassembly of the tooth for irrigation tests after splitting longitudinally. Then each tooth was split into two halves and an artificial groove (L:4, W:0,2 , D:0,5 ) was cut in one half of the root canal wall 1 mm from the apex ,which was then filled with a Ca(OH)2 paste. Digital images were taken before reassembling under stereomicroscope X40. Subsequently the two halves of roots were reassemble with wax , and remounted in their silicone matrixes, then divided into 2 groups.



References used
BYSTRO.M A, S.G., Bacteriologic evaluation of the efficacy of mechanical root canal instrumentation in endodontic therapy. Scandinavian Journal of Dental Research, 1981. 89: p. 321-8
FAVA. L. , S.W., hydroxide pastes: classification and clinical indications. International Endodontic Journal,, 1999. 32: p. 257-82
QRSTAVIK D, K.K., MOLEVN O, Effects of extensive apical reaming and calcium hydroxide dressing on bacterial infection during treatment of apical periodontitis: a pilot study. International Endodontic Journal, 1991. 24: p. 1-7
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Residual Calcium Hydroxide dressing on the root canal is considered one of the reasons of endodontic treatment failure. So ,the removal of this dressing completely before filling is required. The aim of the study was to evaluate the efficiencies o f passive ultrasonic irrigation And increasing the instrumentation of the medicated canal to the file one size larger than MAF in removal of Calcium Hydroxide dressing.
Aim: The aim of this study was to detect the effect of dressing period of calcium hydroxide medicament on the apical marginal leakage after obturation of root canal system. Materials and Methods: 80 freshly extracted single rooted human teeth were selected ,all the root canals were hand-instrumented. They were randomly divided into four groups of 20 teeth each. Group A has no intracanal medicament , groups (B,C,D) were dressed with Ca(OH)2 paste for a different periods of time (7,14,30) days respectively, groups (B,C,D) were divided into subgroups of 10 teeth according to removing of dressing . The removal of ca(OH)2was done by two ways, 1- By irrigating with distilled water and drying with paper points . 2- Size 40 k-file was used in slightly filing motion up to the working length then irrigated with distilled water and drying with paper points. After that all groups were obturated with lateral compaction technique using gutta-percha points and zinc oxide-eugenol cement. Then the access was sealed with GIC cement. The teeth were immersed into 2% mythylene blue solution ,The specimens were placed in an incubator at 37 C ,with moisture at 100%, for 7 days .After that the roots were sectioned longitudinally and examined with stereomicroscope and liner leakage was measured.
Aim: to compare the apical sealing ability of three root canal sealers in human extracted teeth using dye penetration. Materials and Methods: thirty extracted human maxillary teeth were instrumented 1mm short of the anatomical apex and randomly as signed to three groups (n=10), according to the root canal sealer used for obturation. The teeth were divided into three experimental groups and obturated by cold lateral compaction of gutta-percha and one of the following sealers: group I, Zinc oxide and Eugenol sealer; group II, Adseal; group III, Apexit plus.The teeth were covered with nail varnish to within 2-3mm of the apical foramen and immersed in 2% methylene blue for 24 hours.After this period, the teeth were washed and cut longitudinally for apical leakage measurement inside the canal. Results: Statistical evaluation of the results showed no significant difference in the leakage between Adseal and Apexit plus (P =0.99). Leakage with ZOE was significantly lesser than Adseal (P=0.004) andApexit Plus (P=0.003). Conclusions:under the condition of this study, it can be concluded that ZOE presents lower apical leakage than Adseal and Apexit plus, and there was no significant difference in leakage between Adseal and Apexit plus.
A good apical sealing is considered the key of the successful endodontic treatments. The aim of this study was to compare the apical seal of GuttaFlow and AH Plus using single cone and lateral condensation technique.
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