Volume : 5, Issue : 4, April - 2016

A COMPARATIVE STUDY TO EVALUATE REGIONAL POST RETENTION OF A PRE FABRICATED FIBRE POST AND CUSTOM CAST POST USING THE PUSH OUT TEST- AN INVITRO STUDY

Dr Divyank Dayal, Dr Gunjan Chouksey, Dr Roopa Kt

Abstract :

<p>&lt;p&gt;&amp;lt;p&amp;gt;&amp;amp;nbsp;Background: Post and cores contribute in providing predictable restorative options for endodontically treated teeth. The clinician should be knowledgeable in selecting the right type of post and core systems to meet the biological, mechanical, and esthetic needs for each individual tooth. Objectives: The objective of this study was to evaluate regional post retention of a pre-faicated fiber post and custom made cast post using the push-out test. Method: The crowns of 20 recently extracted sound maxillary central incisors were sectioned transversely 2mm coronal to the labial cementoenamel junction and the roots were treated endodontically. Fiber posts (Reforpost, Angelus) and custom made posts were luted using resin cement ( RelyX Unicem, 3M-ESPE). Push-out bond strength tests were performed using a Universal Testing Machine. Bond strength at failure for each section was recorded. Results: Results of the One-way ANOVA test indicated that the bond strength at the coronal sites was highest and the apical sites were least for both, glass fiber reinforced posts and custom posts. Comparison between the two post types using unpaired student&amp;amp;rsquo;s t test showed that custom posts were significantly more retentive in the coronal section while the glass fiber posts were more retentive in the middle and apical sections. The overall bond strength was higher for glass fiber posts but the difference was statistically insignificant. Conclusion: The study showed that coronal dentin gave higher bond strength values when compared to the middle and apical dentinal sites, while the apical dentin was least favorable to offer good bond strength irrespective of the type of post used.&amp;lt;/p&amp;gt;&lt;/p&gt;</p>