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KMID : 0988720090250030225
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Journal of the Korean Academy of Stomatognathic Function and occlusion
2009 Volume.25 No. 3 p.225 ~ p.235
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Lee Ja-Hyung
Shin Soo-Yeon
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Abstract
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A common procedure of restoration of endodonticlly treated tooth with fiber-reinforced post is followed by core build-up after post cementation. However, this technique is complex and time-consuming. The aim of this study was to compare fracture strength of premolar, restored with various methods of core fabrications on fiber-reinforced posts and casting metal restoration. Forty five freshly extracted human mandibular premolars were obtained and devided into 5 groups acconding to the type of post and methods of core build-up. In Group A, D.T. Light-postⓡ were cemented with DUO-LINKTM and then LIGHT-CORETM was used for core restoration. In Group B, D.T. Light-postⓡ and DUO-LINKTM were used for cementing in the postspace, and DUO-LINKTM was used again for core restoration. In Group C, Light-postⓡ bonding and the core build-up were performed simultaneously by using DUO-LINKTM. In Group D, LuxaPostⓡ was bonded by using LuxaCoreⓡ-Dual. Again, LuxaCoreⓡ-Dual was used for core restoration. In Group E, LuxaPostⓡ bonding and the core build-up were performed simultaneously by using LuxaCoreⓡ-Dual. Axial reduction was formed parallelly as possible and 45 degree bevel was made at buccal occlusal surface. Crowns were fabricated and cemented. Each tooth was embedded in self-curing acrylic resin to the level of 2mm below the CEJ. Specimens were fixed on universal testing machin such that the axis of the tooth was at 45 degree inclination to the horizontal plane, and compressive force was applied at a crosshead speed of 1mm/min until failure occurred. The mean fracture strength was the highest in group A followed by descending order in group B, D, E and C. However, there were no statistically significant differences between groups with regard to the fracture strength. The type of the post or build-up methods of the core does not seem to influence the fracture strength.
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KEYWORD
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Fiber-reinforced resin post, Fracture strength, Fracture pattern, Methods of core fabrication
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