Weinberg L A, Kruger B
New York University College of Dentistry.
Oral Surg Oral Med Oral Pathol. 1994 Jul;78(1):22-7. doi: 10.1016/0030-4220(94)90112-0.
The force distribution of multiple tooth-supported and implant-supported prostheses is completely different. A direct correlation exists between the degree of flexion at the site of loading and the amount of force distribution to other members of the prosthesis. Micromovement produced by the periodontal fibers facilitates force distribution to all the root surfaces of the natural tooth abutments. The rigidity of the implant/abutment/prosthesis configuration concentrates the force at the crestal bone at the site of loading with limited distribution to the remaining implants. Differential mobility concentrates the force distribution to the bone support of the most rigid members of splinted natural teeth or to the implants when they are united with natural teeth in a combined prosthesis. Implants always support the natural teeth and never the other way around. Therefore a nonrigid attachment is recommended between a tooth-supported prosthesis and an implant-supported prosthesis when they are combined. However, when implants are interspersed with natural teeth in the same prosthesis, the restoration will be implant borne. This requires special force distribution analysis to prevent implant overload.
多牙支持式和种植体支持式修复体的力分布完全不同。加载部位的弯曲程度与力向修复体其他部件的分布量之间存在直接关联。牙周纤维产生的微动有助于将力分布到天然牙基牙的所有牙根表面。种植体/基台/修复体结构的刚性将力集中在加载部位的牙槽嵴顶骨处，向其余种植体的分布有限。差异移动性将力分布集中到夹板固定天然牙最刚性部件的骨支持上，或者当种植体与天然牙在联合修复体中结合时集中到种植体上。种植体始终支持天然牙，反之则不然。因此，当牙支持式修复体和种植体支持式修复体联合时，建议采用非刚性连接。然而，当种植体与天然牙在同一修复体中穿插时，修复体将由种植体承担。这需要进行特殊的力分布分析以防止种植体过载。
