Clinical Research Of Bone Absorption After Planting With Bone Splitting Technique Combined With GBR

ObjectiveBone splitting technique has been applied in dental implant operation with narrow maxillary anterior,but in the second stage surgery we often find there are some bone absorptions around the implants.In order to solve the problem,we design this study.Conventional bone-splitting position is in the middle of alveolar ridge,this study modifies the splitting position. the bone split position was1mm by palatal side,making the lip side bone thicker than the palatal side,with more cancellous bone in labial side,to ensure the flow of blood to the labial bone plate.The progress of bone-splitting and implant are going on in the same period. Six months later in the second stage surgery,we measure the height change of bone plate around the implant neck,and evaluate the clinical treatment effects of the absorption of buccal and palaral bone-wall by improved bone splitting technique.Methods20patients missing maxillary anterior teeth with the sufficient vertical bone height and the maxillary anterior alveolar ridge of3mm to5mm, were enrolled in this study.28implants were placed using bone splitting technique,bone substitute grafting and guide bone regeneration technique would be used.28implants were randomly divided into observation group and control group,each group was of14dental implants.The bone split position in the control group was in the middle of the lip side and palatal side,while the bone split position in the observation group was lmm by palatal side. Two-stage operations were after6months,observing the bone of implants around and caculating the loss of bone wall height.Results1patient is found biological membrane exposure and wound dehiscence and infection in one week after operation.It doesn’t affect through teeatment. In the second stage surgery we find the percussion of implant sounds ringing. One year after implant restoration all implants are not loose,and the gum around implants is normal.The absorption of buccal bone wall was (0.77±0.11)mm and the absorption of palaral bone wall was (0.41±0.12) mm in observation group. The absorption of buccal bone wall was (1.57±0.16) mm and the absorption of palaral bone wall was (0.34±0.11) mm in control group.The difference of absorption in buccal bone wall between the two groups was statistically significant.(.P<0.05) The difference of absorption in palaral bone wall between the two groups was not statistically significant.(P>0.05)ConclusionThe research adopts the same kind implant and surgery and same operator and surgical instruments.Excluding the issues above,we think the different blood flow of labial bone plate influences the bone absorption. The split buccal bone wall retained relatively more cancellous bone in the improved bone splitting technique, that effectively prevented further absorption of buccal bone wall.The blood flow of gingival flap becomes worse after bone-splitting,that causes bone absorption easily. With more cancellous bone in labial side in observation group,supplying richer blood supply and stimulating osteogenesis than the control group,that make it has stronger ability to resist infection.So in this study the bone absorption of labial side in observation group is less than that of control group.