| ObjectiveTo evaluate the changes of the alveolar bone six months after the alveolar ridge preservation using allograft bone in aesthetic area and compare it to un-disturbed natural healing.Objective to explore the application value of allogenic bone in aesthetic area.Method21 patients,equiring a non-molar extraction and delayed implant placement were randomly selected to receive either extraction alone(EXT)or ridge preservation(RP)using allograft bone and a collagen membrane.Horizontal and vertical ridge dimensions were determined using a modified digital caliper and a periodontal probe respectively at baseline surgery and at 6 month re-entry.Then horizontal and vertical ridge dimensions were determined by CBCT at baseline surgery and at 6 month re-entry.Prior to implant placement,a bone core biopsies were harvested from center of the edentulous ridge of the patients in experimental group.Histo-morphometric evaluation of the samples was performed using hematoxylin&eosin stains.ResultsThe change in horizontal ridge width was higher in the control compared to the experimental group:1.48±0.70mm versus 2.86±0.74 mm at 4 mm and 1.25±0.65mm versus 2.44±0.51 mm at 7 mm,for the experimental and control sites,respectively.The change in vertical ridge height was higher in the control compared to the experimental group:0.37±0.20mm versus 0.80±0.41 mm at medial and 0.55+0.17mm versus 0.8110.17mm at distal,for the experimental and control sites,respectively.Besides,clinical direct measurement and CBCT measurement were largely consistent in the evaluation of the alveolar bone width.According to histological analysis,all specimens showed evidence of new bone formation,with most of the residual graft particles surrounded intimately by woven boneConclusions1.Alveolar ridge preservation using allograft bone in aesthetic area can effectively reduce the absorption of alveolar bone width and height after tooth extraction.2.CBCT can be used as an effective means for evaluating alveolar bone changes after site preservation. |
