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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/16287

Title: Retention of cast post and core cemented with three luting agents
Authors: Al-Wazzan, K.
Al-Ali, K.
Keywords: Cast post; core; cemented; luting agents
Issue Date: 2005
Publisher: Egyptian Dental Association
Citation: Egyptian Dental Journal; 51(3): 1333-1339
Abstract: Purpose: This study investigated the effect of three types of cement materials on the retention of cast post and core and examined the effect of core preparation on the retention of cemented posts.Materials and Methods: Sixty extracted teeth were subjected to root canal therapy instrumentation and were left unobturated. Post spaces were prepared by Peeso reamers followed by no. 6 parallel-sided Parapost twist drill to a depth of 10 mm. Post and core patterns were fabricated, sprued, invested and cast. The specimens were divided into 3 groups of 20 each. The posts were cemented with zinc-phosphate (Cement Type I), glass-ionomer (Ketac-Cem) or composite resin cements (C&B cement). The specimens were stored in water at 37˚C for 24 hours. The specimens were further divided into two subgroups of 10 each used for the prepared and unprepared cores respectively. The core preparation carried out by using a diamond instrument. The post retention was tested using a universal testing machine. A 2-way ANOVA and the Tukey's multiple range test were used to determine the mean differences.Results: The mean forces required to remove posts from unprepared groups were 482±102 N for zinc-phosphate, 283±88 N for glass-ionomer and 442±98 N for composite resin. The zinc-phosphate and composite resin cements specimens exhibited significantly greater retention forces compared to the glass-ionomer cement specimens (P≤0.003) The core preparation only significantly influenced the retention forces for the glass-ionomer cement (P=0.038).Conclusions: Retention forces of Cement Type I and C&B composite resin cements were significantly greater than those of Ketac-Cem cement after 24 hours of cementation. High-speed preparation 24 hours after cementation had a significant negative effect on the retentive strengths of cast posts cemented with Ketac-Cem, but not posts cemented with Cement Type I or C&B cements.
URI: http://hdl.handle.net/123456789/16287
ISSN: 0070-9484
Appears in Collections:College of Dentistry

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