Ferrari M, Vichi A, Grandini S
Department Dental Materials, University of Siena, Italy.
Dent Mater. 2001 Sep;17(5):422-9. doi: 10.1016/s0109-5641(00)00102-0.
Recently, several adhesives have been proposed for bonding fiber posts into root canals. The aim of this study was to evaluate the influence of four adhesive procedures in resin tag, adhesive lateral branch and resin dentin interdiffusion zone (RDIZ) formation when used to bond fiber posts.
Forty anterior teeth, extracted for periodontal reasons and endodontically treated, were selected for this study. The samples were randomly divided into four groups of ten samples each. Group 1: One Step applied with the small brush provided by the manufacturer and LC (Light-cured before resin cement application)+Dual Link resin cement; Group 2: One Step applied with a thin microbrush LC+Dual Link resin cement; Group 3: One Step applied with a small brush (Not light-cured)+Dual Link resin cement; Group 4: All Bond 2+C & B resin cement (as control). In Group 2 and 4 the adhesive system and resin cement were used strictly following manufacturers' instructions. In Group 1, One Step was applied using a thin microbrush, while in the other groups by a small brush. In Group 1 and 2 the priming-adhesive solution of the "one-bottle" system was light-cured before placing the resin cement and the post, whereas in Group 3 the adhesive/resin cement combination was light cured through the translucent post. Forty translucent posts (RTD, France) were used. A week later, the root samples were processed for SEM observations.
Microscopic examination of restored interfaces of Group 1 showed a higher % (P<0.05) of RDIZ than those found in samples of Group 2, 3 and 4. In Group 2, 3 and 4 samples RDIZ morphology was well detectable and uniform in the first two thirds of root canals while in the apical third the RDIZ was not uniformly present. No statistically significant differences were found among the groups coronally, whereas apical and middle thirds of Group 1 showed significantly more resin tags than the other three Groups. In the apical third of Group 2, 3 and 4 samples, the resin tags showed a less uniform morphology and a shorter length than those found in the other two thirds.
A microbrush might clinically be used for bonding fiber posts into the root canal. When a microbrush was used, the bonding mechanism created between root canal dentin and bonding system was uniform along canal walls and more predictable.
最近，已有几种粘结剂被提议用于将纤维桩粘结到根管中。本研究的目的是评估四种粘结方法在用于粘结纤维桩时对树脂突、粘结侧支和树脂牙本质相互扩散区（RDIZ）形成的影响。
选取因牙周原因拔除并经根管治疗的40颗前牙用于本研究。样本随机分为四组，每组10个样本。第1组：使用制造商提供的小刷子涂抹一步法粘结剂，并采用LC（在应用树脂水门汀前光固化）+双固化树脂水门汀；第2组：使用细微型刷子涂抹一步法粘结剂，LC+双固化树脂水门汀；第3组：使用小刷子涂抹一步法粘结剂（未光固化）+双固化树脂水门汀；第4组：使用全粘结2+C&B树脂水门汀（作为对照）。在第2组和第4组中，严格按照制造商的说明使用粘结系统和树脂水门汀。在第1组中，使用细微型刷子涂抹一步法粘结剂，而在其他组中使用小刷子。在第1组和第2组中，“单瓶”系统的底漆粘结剂溶液在放置树脂水门汀和桩之前进行光固化，而在第3组中，粘结剂/树脂水门汀组合通过半透明桩进行光固化。使用了40个半透明桩（RTD，法国）。一周后，对牙根样本进行扫描电子显微镜观察处理。
第1组修复界面的显微镜检查显示，其RDIZ的百分比高于第2、3和4组样本（P<0.05）。在第2、3和4组样本中，RDIZ形态在前根管的前三分之二处易于检测且均匀，而在根尖三分之一处RDIZ并非均匀存在。各组在冠部无统计学显著差异，而第1组的根尖和中部三分之一处显示出比其他三组明显更多的树脂突。在第2、3和4组样本的根尖三分之一处，树脂突的形态不如其他三分之二处均匀，长度也较短。
微型刷子在临床上可用于将纤维桩粘结到根管中。当使用微型刷子时，根管牙本质与粘结系统之间形成的粘结机制沿根管壁均匀且更可预测。
