effect of cleaning method, luting agent and preparation procedure on the retention of fibre posts

Eff ect of cl eanin g me th od, lut in g ag ent an d pr ep arat ion pr oc edure on th e retent io n of fib re po st s K. Bitter 1 , W. Eirich 1 , K. Neumann 2 , R. Weiger 3 & G. Krastl 3 1 Department of Operative Dentistry and Periodontology, University School of Dental Medicine, Charite ´ Centrum 3, Char it e ´ – Universita ¨ tsmediz in Berli n, Berlin; 2 Institute for Bio metry and Clinical Epidemiol ogy, Char ite Ćent rum 4, Cha rite ´ – Universita ¨tsmedizin Berlin, Berlin, Germany; and 3 Department of Periodontology, Endodontology and Cariology, School of Dental Medicine, University of Basel, Basel, Switzerland Abstract Bit ter K, Eirich W, Neumann K, Weiger R, Krastl G. Effect of cleaning method, luting agent and preparation procedure on the retention of fibre posts. International Endodontic Journal , 45, 1116 – 1126, 2012. Aim To invest iga te the eff ects of var iou s cle ani ng methods, luting agents and preparation procedures on fibre post retention. Methodology In tot al, 156 human can ine s wer e alloc ated to twel ve group s. Teet h were decorona ted, inst rume nt ed and root fil le d using warm ve rtical gutta-percha compaction. Post space preparation was performed in 78 roots using the dedicated preparation drills of the DT Light Post SL system [group post drill (PD)]. Gutta -perc ha was removed from the other 78 roots using a round bur (RB) (group RB). Within each of these two groups, 26 root canals were rinsed with 1% NaOCl (contr ol), 26 were cleane d using rotatin g brush es and pumice powder, and 26 were sandbla sted with Al 2 O 3 (50 lm) using an intraoral device. Cleanli- ness of each root canal was investigated using an oper- ati ng mic ros cope ( n = 24) and scanni ng el ec tron micro scop e (n = 2 ). Fib re posts were ins ert ed using self-adhesive resin cement (SmartCem2) or core build- up material (CoreX Flow/XP Bond). Pull-out force was measured using a universal testing machine. Statistical analy ses were perfo rmed using three -way ANOVA and Tukey’s HSD post hoc tests. Results Roo t cana l clea nlin ess was not affecte d by the cle ani ng met hod ( P = 0.618 , chi-s quare d test). Pull-out force for fibre posts was significantly affected by the cleaning method ( P = 0.008), the luting agent (P < 0.0005) and the pre par ation procedure ( P < 0.0005, three-way ANOVA). RB group demonstrated significantly higher pull-out forces [399 (88) N] compared with PD group [287 (105) N]. Posts that were inserted using Cor eX Flo w/XP Bon d exh ibi ted sig nifi can tly hig her pul l-o ut for ces [370 (62 ) N] compar ed wit h posts inserted using SmartCem2 [315 (141) N]. Conclusion The different cleaning methods did not lead to significant differences in root canal cleanliness and did not enhance fibre post retention inside the root canal. Howeve r, pos t spa ce pre par ation using a RB might be beneficial for improving retention, especially when self-adhesive cements are used. The use of the core build-u p mater ial CoreX Flow/ XP Bond instead of the self-adhesive resin cement, SmartCem 2, resulted in significantly higher pull-out force. Keywords: adh esi ve lut ing, fibre pos t, post space preparation, root canal cleanliness. Received 10 May 2011; accepted 3 May 2012 Introduction Adhesi vel y lut ed fibr e-r ein for ced compos ite (FRC) posts are used freq uentl y to restore root filled teet h. Clini cal studi es have demo nstrat ed favo urable resul ts reg arding the use of FRC posts in the med ium term (Cagidiaco et al. 2008, Bitter et al. 2009a). However, Correspondence: Kerstin Bitter, Department of Operative Den- tistry and Periodontology, University School of Dental Medi- cine , Char ite ´ Centr um 3, Chari te ´ – Universi ta ¨ tsmediz in Berl in, Aßmannshau ser Straße 4-6, D-14197 Berlin, Germany (Tel.: +49 30 450 562 011; fax: +49 30 450 562 932; e-mail: kerstin.bitter@cha rite.de). © 2012 International Endodontic Journal International Endodontic Journal , 45, 1116–1126, 2012 doi:10.1111/j.1365-2591.2012.02081.x 1116

effect of cleaning method, luting agent and preparation procedure on the retention of fibre posts

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