不同制作方法及粘接材料对桩固位力影响的实验研究

Objective This study was to compare the retention of posts fabricated by differentmethods and cementedwith var- ious cements in order to provide a guidance for clinical choice of post fabrication methods and luting cements.Methods Ninety human maxillary anteriorteethwere sectioned by the cementoenamel junction and post-holeswere prepared. All rootswere embed- ded in the center of plastic cylinders and paralleled with the cylinder. All sampleswere divided into 9 groups randomly and equal- ly. Posts fabricated with different methods were then cemented with different luting cements. Each sample was placed into a spe- cialized jig and mounted on a tensile testing machine with crosshead speed of 5 mm/min. Constant tensile force was applied until the post was dislodged, and the tensile force required to dislodge the cemented post was recorded.Results The mean retention force of parapost and direct post demonstrated significantly higher than that of indirect post did (P0·05). The mean retention of parapost cement demonstrated significantly higher than that of ZPC andHY-Bond cement did (P0·05).Conclusion Different fabrication methods and luting cements significantly affect the retention of posts; and there exists an interaction between different fabricating methods and luting cements.