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作者采用改良Ｃａｖｉｔａｌ糊剂（Ｍ．Ｃ．Ｐ）对９０例慢性牙髓炎、尖周炎病牙行根管充填，追踪观察６年；并与常规根充对照，同时将因牙折而拔除的实验组与对照组牙齿行光镜和扫描电镇对照观察。结果表明：两组临床治愈，根充三年以上，实验组疗效显著（ｕ＝４．０３５；Ｐ＜０．０１）。实验组的组织病理学显示：根管腔周围和根端孔见牙本质和牙本质桥形成，并见牙骨质向根管内沉积、增生，封闭根端孔。达到生物学性封闭根端的效果。而对照组标本则未见上述组织学修复现象。
The authors used improved Cavital paste (M.C.P) 90 cases of chronic pulpitis, periapical disease root canal filling, follow-up observation of 6 years; and conventional root canal control, at the same time due to tooth extraction and removal The experimental group and the control group were treated with light microscope and scanning electron microscope. The results showed that the clinical curative effect of both groups was better than that of the experimental group (u = 4.035; P <0.01). Histopathology of the experimental group showed that the formation of dentin and dentin bridges around the root canal and the root orifice, and the deposition of cementum into the root canal, hyperplasia, and closure of the root orifice. To achieve the biological end of the root closure effect. The control group of specimens did not see the above histological repair phenomenon.