磷酸钙牙根管材料的封闭性能研究

Study on the Sealing Capability of A Calcium Phosphate Root Canal Filling Material

以自行研制的磷酸钙 ( α- TCP/ TTCP)水泥作为牙根管充填材料 ,为了评价该材料的封闭性能 ,以六只成年狗作为实验对象 ,人为造成根端开放后 ,在根管内充填磷酸钙水泥 ,并同时以 Ca( OH) 2 糊剂、HA糊剂作为对照组 ,动态观察根尖孔闭合情况及根尖周组织修复过程 ,进行组织学及 SEM分析。结果表明 ,磷酸钙水泥比 Ca( OH) 2 糊剂和 HA糊剂的封闭性能更为优异 ,在根管内与牙本质壁适合性好 ,具有优良的生物相容性 ,能引导根尖钙化组织沉积 ,完全封闭根尖孔 ,促进根尖周组织愈合。适用于根端开放。

To evaluate the sealing potential of self-designed root canal filling material made of calcium phosphate cement (α-TCP/ TTCP, CPC), the apices of root canals of six adult dogs were purposely perforated and enlarged up to the No 40 instrument. Then CPC was used to fill the root canal. Mean while either calcium hydroxide (Ca(OH) 2) paste or hydroxyapatite (HA) paste was used as control. The animals were killed at 4, 12, 20 weeks postoperatively. The different materials about ways of apical closure, restoration periapocal tissues and adaptability to the dentinal surface were observed by histomorphology and scanning electron microscopic. This study revealed that CPC had excellent biocompatibility and adaptability to the dentinal wall. Its osteoconduction can promote the formation of calcific barriers and healing of periapical tissue. The apex can be closed completely. Compared with the control pastes it has advantages of ease of manipulation and better sealing capability. The results showed that CPC could be used as a root canal filling material for pupless teeth with open apex and destructive periapical tissue.