Mayhew J T, Windchy A M, Goldsmith L J, Gettleman L
Department of Prosthodontics, School of Dentistry, University of Louisville, Louisville, KY 40292, USA.
J Endod. 2000 Jun;26(6):341-4. doi: 10.1097/00004770-200006000-00008.
This study examined the effect of three sealers and four irrigants on retention of Dentatus preformed posts luted with Panavia 21 resin cement. Gutta-percha with one of the following sealers--EWT, AH26, Nogenol, or no sealer (control)--was used to fill the root canals of 160 autoclaved incisor and premolar tooth roots. After 72 hr 8 mm post spaces were created with Dentatus Probos Pathfinders and Dentatus reamers. After irrigating the post spaces with saline, 5.25% NaOCl, 50% citric acid followed by NaOCl, or 40% H3PO4, followed by NaOCl, Panavia 21 TC cement was introduced into the canal on the Dentatus #4 stainless steel post's threads. An up-and-down and counterclockwise motion and then a forward twist seated the posts without engaging dentin. Mesiodistal and faciolingual radiographs visualized the chambers. After 72 hr posts were removed axially with an Instron at 5 mm/min. Surprisingly, using Nogenol sealer reduced post retention whereas EWT and AH26 increased retention compared with no sealer. Post retention improved after acid etchants, especially for AH26.
本研究考察了三种封闭剂和四种冲洗剂对用Panavia 21树脂水门汀粘结的Dentatus预成桩固位力的影响。采用牙胶与以下封闭剂之一——EWT、AH26、Nogenol，或不使用封闭剂（对照组）——对160颗经高压灭菌的切牙和前磨牙牙根进行根管充填。72小时后，用Dentatus Probos探通器和Dentatus扩孔钻制备8mm的桩道。用生理盐水、5.25%次氯酸钠、50%柠檬酸后接次氯酸钠，或40%磷酸后接次氯酸钠冲洗桩道后，将Panavia 21 TC水门汀涂覆在Dentatus #4不锈钢桩的螺纹上并导入根管。上下及逆时针旋转运动，然后向前扭转将桩就位，不接触牙本质。拍摄近远中向和颊舌向X线片观察髓腔情况。72小时后，用Instron以5mm/min的速度轴向取出桩。令人惊讶的是，与不使用封闭剂相比使用Nogenol封闭剂降低了桩的固位力，而EWT和AH26则增加了固位力。酸蚀剂处理后桩的固位力有所提高，尤其是对于AH26。
