Laurell L, Lundgren D
Department of Periodontology, Institute for Postgraduate Dental Education, Jönköping, Sweden.
J Prosthet Dent. 1988 Jul;60(1):106-12. doi: 10.1016/0022-3913(88)90359-9.
Axially directed occlusal forces over unilateral posterior two-unit cantilever segments of cross-arch fixed partial dentures were measured during natural functioning by using built-in transducers, one in each cantilever unit. The mean local maximal occluding and maximal chewing forces were significantly larger over the first (124 N and 64 N) than over the second (21 N and 29 N) cantilever unit. The average intraindividual ratio between the forces over the first and second cantilever unit amounted to 12:1 for maximal occlusion and 3:1 for maximal chewing. Despite the smaller mean total maximal chewing (92 N) than mean total maximal occluding cantilever force (145 N), the resulting axially directed mean bending moments in the joint between the distal abutment crown and the cantilever segment did not differ significantly. This is explained by the larger mean maximal chewing (29 N) than mean maximal occluding (21 N) force over the second cantilever unit. This demonstrated that not only the magnitude of occluding and chewing forces over cantilever segments but also their distribution along the cantilevers is of importance for the magnitude of functional stress created in cantilever fixed prosthesis.
在自然功能状态下，通过使用内置传感器（每个悬臂单元一个）测量跨牙弓固定局部义齿单侧后牙双单元悬臂段上的轴向咬合力量。第一个悬臂单元上的平均局部最大咬合和最大咀嚼力（分别为124 N和64 N）显著大于第二个悬臂单元（分别为21 N和29 N）。第一个和第二个悬臂单元上的力的个体内平均比值在最大咬合时为12:1，在最大咀嚼时为3:1。尽管平均总最大咀嚼力（92 N）小于平均总最大咬合悬臂力（145 N），但远中基牙冠与悬臂段连接处产生的轴向平均弯矩没有显著差异。这可以通过第二个悬臂单元上平均最大咀嚼力（29 N）大于平均最大咬合（21 N）来解释。这表明，对于悬臂固定修复体中产生的功能应力大小而言，不仅悬臂段上的咬合和咀嚼力大小，而且它们沿悬臂的分布都很重要。
