TY - JOUR ID - TI - Comparison of regional bond strength of post space of fiber-reinforced post luted with two types of cements at different testing times AU - Haitham J. Al-Azzawi AU - M.N.H. PY - 2013 VL - 25 IS - 3 SP - 19 EP - 23 JO - Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد SN - 18171869 23115270 AB - Back ground: This in vitro study was carried out to investigate the effect of post space regions (coronal, middle andapical), Time and the mode of polymerization (dual, self-cured) of the cements used on the bond strength betweentranslucent fiber post and root dentin by using push-out test.Materials and Methods: Forty eight extracted mandibular first premolars (single root) were instrumented with ProTaperUniversal system files (for hand use) and obturated with gutta percha for ProTaper and AH26® root canal sealerfollowing the manufacturer instructions, after 24 hours post space was prepared using FRC postec® plus drills no.3creating 8 mm depth post space. The prepared samples were randomly divided into two main groups (24 sampleseach) according to the used cement (Group M, self-cure, Multilink N) and (Group R, dual cure, Relyx U100). Theneach group was subdivided into three groups (each group contains 8 samples) according to the testing time aftercementation. (g M1: push out test after 24 hour of cementation with Multilink N), (g M2: push out test after one weekof cementation with Multilink N),(g M3: push out test after two weeks of cementation with Multilink N), (g R1: push outtest after 24 hours of cementation with RelyxU100), (g R2: push-out test after one week of cementation withRelyxU100), (g R3: push out test after two weeks of cementation with RelyxU100). After cementation and incubationeach root was sectioned horizontally into 3 slices (2 mm in thickness) represent the coronal, middle and apicalregions of the post space. Push out bond strength test was performed and measured using a universal testingmachine (Tinius-Olsen) at across head speed of 0.5 mm/min.Results: showed that regarding the root region, the bond strength values increased significantly apical to coronalregion in both tested cements. For the effect of time, the bond strength values also significantly increased with timefor both tested cements. For mode of polymerization, the self-cured resin cement Multilink N showed higher bondstrength values.Conclusion: the retention of fiber post was affected by root region, mode of polymerization of the cements usedand time elapsed after cementation of the post

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