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羟基磷灰石是８０年代的一种新型材料，该材料有良好的组织相容性，并能诱发新骨生成；氢氧化钙是传统的盖髓剂，在临床上得到了广泛的应用，疗效比较肯定。作者将两种材料随机地运用在两组可复性牙髓炎的患牙的直接盖髓上，经过临床２６例比较观察，得出氢氧化钙仍不失为一良好的盖髓剂。因羟基磷灰石缺乏抗感染能力，故有个别病例有炎症反应，本文作者认为如若在羟基磷灰石中加入其它辅助成分用于活髓保存，可望能达到理想的效果。
Hydroxyapatite is a new material in the 80's, which has good histocompatibility and can induce new bone formation. Calcium hydroxide is a traditional capping agent and has been widely used clinically More sure. The authors randomized the use of two materials on the direct pulp capping of the affected teeth in two groups of refolding pulpitis. Calcium hydroxide was found to be a good capping agent after 26 clinical observations. Because of the lack of anti-infective ability of hydroxyapatite, so there are individual cases of inflammatory response, the author of this article if the hydroxyapatite added other auxiliary ingredients for preservation of living pulp, is expected to be able to achieve the desired effect.