Department of Prosthodontics, School of Dentistry,
Kyung Hee University
(Directed by Prof. Ahran Pae, D.M.D.,M.S.D.,PhD.)
Purpose: Various materials and pretreatments on the surface of post are used in fiber-reinforced composite (FRC) post treatments. This study will evaluate the effectiveness of newly proposed universal primer when FRC post is bonded to endodontically treated tooth with resin cement by comparing various surface treatment methods.
Materials and methods: Endodontic treatment was done on single root premolars extracted due to periodontal or orthodontic causes. Canal shaping for FRC post (DT Light post, Size3, Bisco Inc.) was performed at 1.5cm from CEJ by means of low speed drill made by manufacturers. Samples were divided into 6 groups of surface treatment after conventional washing and drying to the canal. Total of 24 FRC posts were randomly divided into 6 groups of surface treatment as follows: 1. Group C: control ? no surface treatment, 2. Group A: airborne-particle abrasion, 3. Group S: silanization, 4. Group M: universal primer, 5. Group AS: silanization after airborne-particle abrasion, 6. Group AM: universal primer treatment after airborne-particle abrasion.
Vertical fiber post placement was performed by means of a surveyer and resin block jig. According to the manufacturer’s instructions, pretreated fiber posts were cemented with resin?based luting material and photo-polymerized. After immersing the samples in saline for 24 hours, they were cut to the thickness of 1mm. Push-out test using a universal testing machine was performed. Bonding failure strength of post dislodgement was measured and the type of bonding failure was classified. Data were analyzed with Kruskal-Wallis test and multiple comparison groups were performed using Tukey HSD value of rank test (α=.005)
Results: The control group C showed the lowest bonding strength. Group AS which was treated with silane after airborne particle abrasion showed significantly highest bonding strength. Silane treated group S, universal primer treated after airborne particle abrasion group AM, airborne particle abrasion treated group A and universal primer group M showed lower bonding strength in order.
Conclusions: Silane treated experimental groups showed highest bonding strengths of the surface pretreatment methods for cementation of FRC post. Surface treatment with silane showed to be most effective. Compared with no surface treatment group, surface treatment using universal primer showed no significant difference as for bonding strength.
Keywords: fiber-reinforced composite (FRC) post, surface treatment, universal primer, dental silane.