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bacterial entombment by intratubular mineralization following orthograde mineral trioxide aggregate obturation: a scanning electron microscopy study

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International Journal of Oral Science 2014年第4期6卷 227-232页

作者： Jun Sang Yoo Seok-Woo Chang So ram Oh Hiran Perinpanayagam Sang-Min Lim Yeon-Jee Yoo Yeo-rok Oh Sang-Bin Woo Seung-Hyun Han Qiang Zhu Kee-Yeon kum Department of Dentistry U Dental Hospital Department of Conservative Dentistry School of Dentistry Kyung Hee University Department of Conservative Dentistry Dental Research Institute Seoul National University Dental Hospital Seoul National University School of Dentistry Division of restorative Dentistry Schulich School of Medicine & Dentistry University of Western Ontario Department of Conservative Dentistry Jukjeon Dental Hospital College of Dentistry Dankook University Department of Oral Microbiology & Immunology Dental Research Institute and BK21 Program Seoul National University School of Dentistry Division of Endodontology Department of Oral Health and Diagnostic Sciences School of Dental Medicine University of Connecticut Health Center

The time domain entombment of bacteria by intratubular mineralization following orthograde canal obturation with mineral trioxide aggregate（Mta） was studied by scanning electron microscopy（SEM）. Single-rooted human premolars（n560） were instrumented to an apical size #50/0.06 using ProF ile and treated as follows： Group 1（n510） was filled with phosphate buffered saline（PBS）; Group 2（n510） was incubated with Enterococcus faecalis for 3 weeks, and then filled with PBS; Group 3（n520） was obturated orthograde with a paste of OrthoM ta（BioM ta, Seoul, Korea） and PBS; and Group 4（n520） was incubated with E. faecalis for 3 weeks and then obturated with OrthoM ta–PBS paste. Following their treatments, the coronal openings were sealed with PBS-soaked cotton and intermediate restorative material（IrM）, and the roots were then stored in PBS for 1, 2, 4, 8 or 16 weeks. After each incubation period, the roots were split and their dentin/Mta interfaces examined in both longitudinal and horizontal directions by SEM. There appeared to be an increase in intratubular mineralization over time in the OrthoM ta-filled roots（Groups 3 and 4）. Furthermore, there was a gradual entombment of bacteria within the dentinal tubules in the E. faecalis inoculated Mta-filled roots（Group 4）. Therefore, the orthograde obturation of root canals with OrthoM ta mixed with PBS may create a favorable environment for bacterial entombment by intratubular mineralization.

关键词： bacterial entombment intratubular mineralization orthograde canal obturation scanning electron microscopy tag-like structure

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