A comparative study to evaluate the effect of immediate versus delayed dowel space preparation on the apical seal of Epiphany obturation system with different obturation techniques (An in vitro study)

A.H. Yasin, Samar; Kareem Al-Azzawi, Abdul

	A comparative study to evaluate the effect of immediate versus delayed dowel space preparation on the apical seal of Epiphany obturation system with different obturation techniques (An in vitro study)
Journal of baghdad college of dentistry
Article 1, Volume 21, Issue 3, 2009, Pages 41-46
Authors
Samar A.H. Yasin; Abdul Kareem Al-Azzawi
Abstract
ABSTRACTBackground: The aim of this in vitro study was to compare the effect of immediate versus delayed dowel spacepreparation using rotary instruments (peeso reamers) on the apical seal of roots filled with epiphany obturationsystem by two different obturation techniques: Lateral condensation technique and Thermo-plastic Injectiontechnique (Obtura II).Materials and Methods: Forty freshly extracted human teeth with single and straight canals were used in this study.These teeth were cleaned and their crowns were removed at the cemento-enamel junction, the roots wereinstrumented using the step-back technique, instrumentation was accomplished by using the Gates-Glidden drillswith copious irrigation of 2.5% NaOCL and 17% buffered solution of EDTA was used as the final rinse to remove smearlayer. All roots of all groups were obturated with epiphany obturation system and the roots were randomly dividedinto 4 groups (10 teeth for each group): Group A (Lateral condensation technique + immediate dowel spacepreparation), Group B (Lateral condensation technique + delayed dowel space preparation), Group C (ThermoplasticInjection technique (Obtura II) + immediate dowel space preparation) & Group D (Thermo-plastic Injectiontechnique (Obtura II) + delayed dowel space preparation). The roots of groups A & C received dowel spacepreparation immediately after obturation using peeso reamers to a depth that left 5mm of the filling materialapically while the roots of groups B & D received dowel space preparation after one week storage in 100% humiditycondition at 37Cْ in an incubator. The external surfaces of all roots were coated by two layers of sticky wax exceptfor apical 2 mm and then were submerged in 2% methylene blue dye for 3 days at 37 C.ْ After that all roots werelongitudinally sectioned for linear measurement of dye penetration through the apical forman using astereomicroscope at X40 magnification with calibrated scale ocular grid.Results: The results showed that for immediate dowel space preparation group C showed the lowest mean of dyeleakage (1.525 mm) while for delayed dowel space preparation group D showed the lowest mean of dye leakage(2.335mm).Conclusion: Significantly less apical leakage in roots obturated by thermo-plastic Injection technique than thoseobturated by lateral condensation technique for both immediate & delay dowel space preparation and highlysignificant less apical leakage in roots received immediate dowel space preparation than those received delayedone despite the type of obturation technique.Keywords: Epiphany obturation systems, obtura II, dowel space preparation. (J Bagh Coll Dentistry 2009; 21(4):41-46)

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