PDF(Pubmed)
Abstract：
The purpose of the present study was to perform a preliminary analysis of the fitting of different fiber-reinforced composite (GFRC) posts to tooth root canals and determine the resin cement layer thickness. The following GFRC posts were assessed: bundle posts (Rebilda GTTM, VOCO, Germany), sleeve system (SAPTM, Angelus Ind, Brazil), and accessory posts (ReforpinTM, Angelus, Brazil). Twenty-four freshly extracted mandibular single-rooted pre-molars were endodontically treated and divided into six groups, according to the type of GFRC post and resin cement (self-adhesive or conventional dual-cured). Then, specimens were cross-sectioned and inspected by optical microscopy regarding the cement layer thickness and presence of defects such as pores, voids, or fissures were assessed. Bundle and accessory posts revealed a regular distribution of resin cement with a lower number of voids than found with sleeve systems. The sleeve system posts showed poor fitting at the apical portion of the root canals. The type of resin cement did not affect the thickness of the interface, although both bundle and accessory posts allow a better distribution of resin cement and fibers. The present preliminary study reveals interesting insights on the fitting of bundle and accessory posts to root dentin and resin cement layer thickness in oval-shape root canals. The sleeve system posts showed adequate fitting only at the coronal portion of the canals.
摘要：
本研究的目的是对不同纤维增强复合材料（GFRC）桩与牙根管的拟合进行初步分析，并确定树脂水泥层的厚度。对以下GFRC职位进行了评估：捆绑职位（RebildaGTTM，VOCO,德国),套筒系统(SAPTM，AngelusInd,巴西),和附属帖子(ReforpinTM，Angelus,巴西)。对24个新鲜摘除的下颌单根前磨牙进行了牙髓治疗，分为六组，根据GFRC桩和树脂水泥的类型（自粘或常规双重固化）。然后，试样被横切，并通过光学显微镜检查水泥层厚度和存在的缺陷，如孔隙，空隙,或裂缝被评估。束和附件柱显示出树脂胶结剂的规则分布，其空隙数量少于套筒系统。套筒系统柱在根管的顶端部分显示出不良的配合。树脂水泥的类型不影响界面的厚度，虽然束和附件柱允许树脂水泥和纤维的更好的分布。本初步研究揭示了有关管束和辅助桩与椭圆形根管中的根牙本质和树脂水泥层厚度的拟合的有趣见解。套筒系统柱仅在运河的冠状部分显示出足够的配合。
