[A combined method of autologous bone grafts and collagen allografts for the prevention of bone pockets].

The use of autogenous bone for elimination of intrabony pockets is a well established procedure. With the use of "fill-in-techniques" three problems still remain: 1. the limited amount of bone that can be obtained, 2. the additional surgical intervention to obtain the bone graft, 3. the associated gingival recession, which especially in the front region challenges every intervention. A rather simple combined technique is described to eliminate these difficulties. The use of an allogenic filler compensates efficiently for the limited amount of bone material available. Lyophilized dura mater is a suitable allograft. Lyophilized dura mater is commercially available and the extended and prolonged use in general surgery has confirmed it as a very reliable substitute. Its adaptation to the complex morphology of intrabondy defects and surrounding structures is easily obtained by cutting it to the desired shape and compressing it with a gauze pad. The additional surgical intervention and trauma can often be eliminated by the autogenous osseous material which is obtained from an intra-oral source, usually from the area where hte surgery is being performed. By incorporation of a filter in the existing suction device the osseous coagulum can be collected permitting the utilization of a coolant. The use of several layers of the allogenic graftmaterial reduces the gingival recession to a minimum and restores the interdental papilla. The small differences between this surgical technique and the classical one do not constitute a major problem. The case must be carefully selected and prescribed technique followed in every detail. The present results are substantiated only by clinical evaluation on a restricted number of patients and during a limited period of time.