Alhadainy H A, Abdalla A I
Department of Restorative Dentistry, College of Dentistry, University of Tanta, Egypt.
J Endod. 1998 Jan;24(1):33-5. doi: 10.1016/S0099-2399(98)80209-4.
Access openings and furcation perforations were prepared in 45 human extracted teeth randomly divided into three equal groups. Furcation perforations were obtruded using only a resin-modified, glass-ionomer material (Vitrebond) in the first group. Calcium sulfate and hydroxylapatite were used as artificial floors under the Vitrebond in the second and third groups, respectively. Pulp chambers and access openings were filled with composite resin. After immersion in 2% methylene blue solution for 2 wk, the teeth were sectioned and dye penetration was measured under a stereomicroscope using a NIH Image 1.47 Macintosh program. Results indicated that calcium sulfate and hydroxylapatite artificial floors significantly improved the sealing ability of Vitrebond and provided successful barriers against its overextension.
在45颗随机分为三组的人离体牙上制备进入开口和根分叉穿孔。第一组仅使用树脂改性的玻璃离子材料（Vitrebond）封闭根分叉穿孔。第二组和第三组分别在Vitrebond下方使用硫酸钙和羟基磷灰石作为人工基底。髓腔和进入开口用复合树脂填充。在2%亚甲蓝溶液中浸泡2周后，将牙齿切片，并使用NIH Image 1.47 Macintosh程序在体视显微镜下测量染料渗透情况。结果表明，硫酸钙和羟基磷灰石人工基底显著提高了Vitrebond的封闭能力，并成功地防止了其超填。
