Creation of functional interface on dentin by powder jet deposition

粉末喷射沉积(PJD)工艺可用于在人类牙齿表面形成一层厚厚的羟基磷灰石(HA)薄膜。在牙本质实验中，在Beagle犬的牙颊面上制备V类洞，分别充填(1)HA膜上的树脂复合体，(2)氧化锌-丁香酚粘固剂作为阴性对照组，(3)磷酸锌粘固剂作为阳性对照组。在牙釉质实验中，用(1)HA膜，(2)树脂封闭剂作为阴性对照组，(3)玻璃离子粘固剂作为阴性对照组，对釉质进行抛光和涂层。应用PJD的所有标本均未观察到严重的炎症反应，甚至比作为阴性对照的标本表现出更轻的反应。在术后的任何时期，牙髓间隙或牙本质小管中均未发现细菌。

A powder jet deposition (PJD) process can be used to create a thick hydroxyapatite (HA) film on the surface of a human tooth. In the experiment using dentin, class V cavities were prepared on the buccal surfaces of the teeth of beagle dogs and filled with (1) resin composite on the HA film, (2) zinc oxide-eugenol cement as a negative control group, or (3) zinc phosphate cement as a positive control group. In the experiment using enamel, the enamel was polished and coated with (1) the HA films, (2) resin sealants as one negative control group, and (3) glass ionomer cement as the other negative control group. No severe inflammatory responses were observed in all specimens applied by PJD, showing even milder response than that of specimens used as negative control. The bacteria were not identified in the pulp space or dentinal tubules in any postoperative periods.