Document Type : Original Article
Authors
Dept. of Operative Dentistry, Faculty of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Abstract
Statement of Problem: Prefabricated posts have recently become more popular due to their satisfactory results while saving time and reducing costs. Glass-fiber prefabricated posts were paid more attention because of reducing the risk of root fracture as well as minimal allergic hypersensitivity and corrosion with satisfactory cosmetic results. Surface treatment is one of the various factors that might affect retention of a post.Purpose: The purpose of this study was to evaluate the effect of surface treatment on the retention of an Iranian E-glass fiber post.Materials and Method: Thirty two intact central maxillary incisors were selected. The coronal aspect of each tooth was removed and the remaining root received endodontic therapy. The specimens were then divided into 4 groups (n=8). Post spaces were prepared to a depth of 10mm.The posts (HtCo, Iran) received one of the surface treatments including cleaning with alcohol (Alc), air borne-particle abrasion and cleaning with alcohol (Air-Alc), cleaning with alcohol and conditioning with silane treatment (Alc-Sil) or airborne- particle abrasion, cleaning with alcohol and conditioning with silane treatment (Air-Sil). All the posts were luted with Panavia F after conditioning the canal dentin primer (ED-primer) according to the manufacturer's instructions. After cementation, the specimens were stored at 37°C for 30 days and subjected to simulated aging conditions, consisting of 7500 thermal cycles (5°C/55°C). Retention of the posts was measured with a universal testing machine with a crosshead speed of 2mm/min. The data were analyzed using one-way ANOVA and Duncan tests (α=0.05).Results: The mean retentive values (N) of the test groups were as follows: Alc=157.63±39.91, Air-Alc=171.53±47.80, Alc-Sil= 167.87±42.49, Air-Sil= 166.53±40.32. There was no significant difference between the mean values of the four groups.Conclusion: Treating the surface of HtCo Iranian post produced no significant improvement in the retention of the posts. Key words: Surface treatment, Glass-fiber post, Retention, Termal cycling
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