Abstract
Optimal bond strength between the prefabricated post/dowel to the surrounding dentin is essential. The present study aimed to analyze and compare the effect of three different cement film thicknesses on the pull-out bond strength of three different prefabricated post systems. Extracted natural teeth (N = 90) with similar root dimensions were acquired. Teeth were mounted in resin blocks, endodontically treated, sectioned at cemento-enamel junction, divided into three groups (A: Parapost Fiber Lux plus; B: 3M ESPE Relyx fiber post; and C: Parapost XP), and stored. Uniform post spaces were prepared for the groups (A and C: Length = 8 mm, Width = 1.5 mm; B: Length = 8 mm, Width = 1.6 mm). Each group (N = 30) was further subdivided into three subgroups (n = 10) based on the size (4, 5, and 6) of the post and cemented with resin cement (MultiLink-N, Ivoclar Vivadent). After thermocycling, the specimens were subjected to a pull-out test using a universal testing machine, and tensile force was recorded (MPa). Digital microscopic evaluations were performed for modes of failure. ANOVA and Tukey-HSD tests were used for statistics. Significant differences were observed for each tested material (p = 0.000). The lowest and highest bond strength values were recorded for Group C (Titanium post) and Group A (000), respectively. Multiple comparisons showed significance (p < 0.05) among all the groups, except for space 1 and space 2 (p = 0.316) for Group A. Most of the failures occurred within the cement-dentin and post-cement interface (Adhesive failures, 73.5%). An increase in the luting cement film thickness results in the decrease in pull-out bond strength of prefabricated posts luted with resin cement, irrespective of the type/material/shape of the post. The serrated fiber posts showed the highest pull-out bond strength compared to the smooth surfaced fiber posts or serrated metal posts. Increased pull-out bond strengths were observed when appropriate post space was created with the same sized drill as the post size.
Highlights
The material, shape, and size of the post; the polymerization process of the luting cements; and cement thickness are factors that can influence the adhesion of endodontic posts to root canal dentin [3]
In pull-out this present instrength vitro research, effectofofthree threecommonly different cement film thicknesses on the bond (Tensilethe stress) used prefabricated post on the pull-out strength (Tensile stress) of three commonly used prefabricated post systems luted tobond the root dentin was analyzed
Three different post systems with three different sizes of posts were used, while the study, three different post systems with three different sizes of posts were used, while the post space diameter remained uniform, and the same resin cement was used for all the post space diameter remained uniform, and the same resin cement was used for all the specimenstested
Summary
Restoration of endodontically treated teeth with extensive loss of coronal tooth structure usually requires the placement of a post inside the root canal to increase retention and stability of the final restoration [1]. Most of the clinical procedures use prefabricated posts adhesively cemented to root canal dentin due to the numerous advantages of prefabricated posts over custom posts. There is increasing demand for using adhesively bonded prefabricated posts, which have the advantages of increased retention, aesthetics, and reinforcement of tooth structure, many factors that may affect the outcome must be considered [2]. The material, shape, and size of the post; the polymerization process of the luting cements; and cement thickness are factors that can influence the adhesion of endodontic posts to root canal dentin [3]
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