中文摘要：

背景：临床上治疗牙髓炎的方法,都是以牺牲牙髓活力为代价且要破坏大量牙体组织,导致牙体容易折裂。但有研究表明牙髓组织具有较强的自我防御能力和自身修复潜能,因此,符合生物学观点的方法是保存活髓。目的：探讨参照数字X射线片测量数据行髓室钻孔的可行性。方法：从VixWinPRO图像处理系统调取牙髓室图像清晰曲面断层片60张,进行髓室高度和宽度的测量。髓室高度为前牙及双尖牙髓室顶到髓室两侧牙槽脊顶连线中点的直线距离,或磨牙髓室顶中点到髓室底中点的直线距离;髓室宽度为平行于牙槽脊顶从牙颈部髓室近中内侧壁到远中内侧壁的直线距离。用软件自带的电子尺测量曲面断层片上牙髓室的高度、宽度,计算平均值;观察牙髓室能否容纳两支直径0.55mm的小儿头皮静脉输液针。结果与结论：前牙及双尖牙髓室最小平均宽度为0.80mm,高度为3.43mm;磨牙髓室最小平均宽度2.35mm,高度1.80mm。提示牙髓室能容纳两支5.5号小儿头皮静脉输液针,可以在牙髓室钻两个引流孔。

英文摘要：

BACKGROUND： Clinical methods for pulpitis always devitalize pulp vitality and destroy a great quantity of tooth tissues, resulting in tooth fracture. However, studies have indicated that pulp tissue has self-defense and self-recovery potentiality. Therefore, it is appropriate to preserve vital pulp considerging biology. OBJECTIVE： To investigate feasibility of drilling pinhole on pulp chamber in digital radiographs. METHODS： A total of 60 clear radiographs from VixWin PRO were selected, and pulp chamber height and pulp chamber width were measured （pulp chamber height： distance from roof of pulp chamber to midpoint of bilateral socket ridge line in the anterior teeth and premolars, or distance from midpoint of roof of pulp chamber to midpoint of floor of pulp chamber in the molars; pulp chamber width： distance from mesiwall to distal wall of pulp chamber. Height and width of pulp chamber was measured with electronic gage in VixWin PRO. Mean was calculated respectively. The pulp chambers were observed whether they were contained two transfusion needles. RESULTS AND CONCLUSION： The smallest mean height was 3.43 mm, width 0.80 mm in front teeth and premolars, and height 1.80 mm, width 2.35 mm in molars. The pulp chambers could contain two transfusion needles （No. 5.5）. It is feasible to drill two pinholes on pulp chamber.