IADR Abstract Archives
In-vitro Retention of Prefabricated and Individually Formed Posts
Objectives: The aim of this study was to investigate the retention of prefabricated resin posts vs. individually formed fiber reinforced composite posts (FRC), cemented with self-adhesive cement. The null hypothesis was that both post systems would be equally retentive.
Methods: Thirty extracted single-rooted human teeth were de-coronated, endodontically treated, and followed by post space preparations in equal lengths. All prepared specimens were randomly divided into two groups (n=15/each) according to the type of post: Group 1. “GC Fiber Post” (GC); Group 2. “EverStick” (GC), Individually formed resin & fibers posts. In both groups, G-CEM LinkAce (GC) was used for posts cementing. Each post was held with moderate pressure and tooth surfaces were light cured for 20 seconds (650mW/cm2). The exposed end of each post was coated with bonding agent (Schotchbond Universal) and fixed in hexagonal steel coupling nut filled with Z250 composite, leaving about 3 mm gap to the tooth surface. The composite was light cured (20s) around the nut end. Treated teeth were kept in water (24hrs) prior to pull out testing. Each specimen was subjected to a tensile force parallel to the longitudinal axis of the posts (Instron, x-head speed 0.5mm/min) until post separation. Data were statistically analyzed using T-Test and ANOVA (significance set at 5%).
Results: Mean Separations force (Newton) and SD of post systems is presented in table below:
Conclusions: Under the conditions of this study, prefabricated Fiber Posts exhibited significant higher retention forces and lower variance than EverStick posts.
Methods: Thirty extracted single-rooted human teeth were de-coronated, endodontically treated, and followed by post space preparations in equal lengths. All prepared specimens were randomly divided into two groups (n=15/each) according to the type of post: Group 1. “GC Fiber Post” (GC); Group 2. “EverStick” (GC), Individually formed resin & fibers posts. In both groups, G-CEM LinkAce (GC) was used for posts cementing. Each post was held with moderate pressure and tooth surfaces were light cured for 20 seconds (650mW/cm2). The exposed end of each post was coated with bonding agent (Schotchbond Universal) and fixed in hexagonal steel coupling nut filled with Z250 composite, leaving about 3 mm gap to the tooth surface. The composite was light cured (20s) around the nut end. Treated teeth were kept in water (24hrs) prior to pull out testing. Each specimen was subjected to a tensile force parallel to the longitudinal axis of the posts (Instron, x-head speed 0.5mm/min) until post separation. Data were statistically analyzed using T-Test and ANOVA (significance set at 5%).
Results: Mean Separations force (Newton) and SD of post systems is presented in table below:
Conclusions: Under the conditions of this study, prefabricated Fiber Posts exhibited significant higher retention forces and lower variance than EverStick posts.