Celletti R, Pameijer C H, Bracchetti G, Donath K, Persichetti G, Visani I
Department of Prosthodontics, University G. d'Annunzio Chieti, School of Dentistry, Italy.
Int J Periodontics Restorative Dent. 1995 Dec;15(6):562-73.
Of concern with the use of preangled abutments on implants is the transmission of masticatory forces and the angle at which they occur. Nineteen endosseous implants were placed in two subhuman primates. After 6 months, to allow for osseointegration, the implants were fitted with preangled abutments of various degrees and restored with type IV alloy castings. Straight abutments were used as control. Histologic evaluation revealed that, after 1 year of service, the implants exhibited complete osseointegration. Implants, whether restored with straight or preangled abutments, had no adverse effect on the surrounding bone. Soft tissue pockets measured, on average, from 2.2 to 2.6 mm; acute and chronic inflammatory cells were present. When crown loss was observed, it was caused by mechanical failure of components, such as gold screws and the screws used to secure the preangled abutments to the implants. Preangled abutments appear to be a valuable adjunct in implant dentistry, although long-term studies are needed for confirmation.
种植体使用预成角度基台时需要关注的是咀嚼力的传递及其产生的角度。在两只非人灵长类动物体内植入了19颗骨内种植体。6个月后，待种植体实现骨结合，为其安装不同角度的预成角度基台，并用IV型合金铸件进行修复。使用直基台作为对照。组织学评估显示，使用1年后，种植体呈现出完全骨结合。无论使用直基台还是预成角度基台进行修复，种植体对周围骨质均无不良影响。软组织袋平均深度为2.2至2.6毫米；存在急性和慢性炎症细胞。观察到牙冠脱落时，是由部件的机械故障导致的，如金螺钉以及用于将预成角度基台固定到种植体上的螺钉。尽管需要长期研究来证实，但预成角度基台似乎是种植修复领域一项有价值的辅助手段。
