Parirokh Masoud, Asgary Saeed, Eghbal Mohammad Jatar, Stowe Sally, Ghoddusi Jamileh
Department of Endodontic, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran.
Department of Endodontics, Dental Research Center, School of Dentistry, Shahid Beheshti Medical University, Tehran, Iran.
Iran Endod J. 2006 Spring;1(1):25-9. Epub 2006 Apr 1.
This study was carried out to investigate calcific tissue formation against mineral trioxide aggregate (MTA) after pulp capping.
The pulps of six teeth from four dogs were exposed and capped with MTA. After extraction each tooth was sectioned into halves. Each half was then further sectioned in the mesiodistal or buccolingual direction. Calcified tissue of the capped area was examined from either the pulpal side or in profile view using scanning electron microscopy and focused ion beam imaging.
The results from all views showed that MTA crystals were in direct contact with calcified tissue. Calcified bridges after focused ion beam preparation showed the same pattern that were seen by scanning electron microscopy in profile view. Newly deposited dentine and early phase of calcosphirit structures could clearly be distinguished from older tubular dentine.
MTA when used as a pulp capping agent could produce calcific tissue in underlying pulp.
本研究旨在调查盖髓后针对矿物三氧化物凝聚体（MTA）的钙化组织形成情况。
从四只狗身上获取六颗牙齿，暴露牙髓并用MTA进行盖髓。拔牙后，每颗牙齿均切成两半。然后将每一半沿近远中或颊舌方向进一步切片。使用扫描电子显微镜和聚焦离子束成像从牙髓侧或侧面观察盖髓区域的钙化组织。
所有视角的结果均显示MTA晶体与钙化组织直接接触。聚焦离子束制备后的钙化桥呈现出与扫描电子显微镜侧面观察所见相同的模式。新沉积的牙本质和早期钙球晶结构可与较老的管状牙本质清晰区分。
MTA用作盖髓剂时可在下方牙髓中产生钙化组织。
