Results the palatal implant connecting with the first permanent molar significantly reduced mesial movement and protrusive displacements of anchor teeth while the implant connecting with the maxillary second bicuspid was in favor of the control on the movement of the first permanent molar towards the medium of the palate 结果种植体连接在第一恒磨牙上更有利于控制支抗牙近中移动和垂直仲长；连接在第二双尖牙上对第一恒磨牙的居向移动控制更好。
Ha possesses well biocompatibility , which has been discovered through test and in clinical application . however , the relatively large dissolution or resorption rates of ha will result in the failure of the implants . fluoridated hydroxyapatite ( hfa ) in whose structure f " occupies partially the position of oh " in ha , is expected to be more resistant to body fluid and less soluble than ha and still possess almost the same bioactivity as ha 生物活性羟基磷灰石薄膜( ca _ ( 10 ) ( po _ 4 ) _ 6 ( oh ) _ 2 ， ha )广泛地应用于钛合金硬组织种植体表面改性，临床应用发现ha薄膜具有很好的生物相容性，但是ha薄膜在体内溶解速度有时可能会过快，引起种植体在体内失效，因此， ha薄膜长效性方面有待于提高。
That is the premise of the bg / ha electrophoresis codeposition . the laws of the electrophoresis deposition of the bg and ha partic les were found by the study on each of their deposition under the different conditions . the electrophoresis codeposition of the bg and ha particles had been studied and the bg / ha graded coating , which is compact in the bottom layer and porous near the surface layer , had been prepared on the surface of the dental implant after the low temperature heat treatment ( about 740 ) and fast firing ( 50 - 80 / min , heat preservation time was 5 - 8min . ) 以bg微粉和ha微粉作为涂层原料，通过研究bg和ha微粉在非水介质中的分散情况和带电特性，选择冰醋酸为介质，使分散在其中的bg颗粒和ha颗粒表面均带上正电荷，为电泳共沉积提供前提条件；通过对不同条件下bg 、 ha各自电泳沉积的研究，探索出了两者电泳沉积的规律；通过对bg和ha在冰醋酸中电泳共沉积以及后续低温( 740左右)快烧( 50 ? 80 min ，保温5 ? 8min )热处理的研究，在钛合金牙根种植体基体上成功制备出了底层致密而表层多孔的bg ha梯度涂层。
