| Objective:To observe the effectiveness of Lando? absorbable collagen membrane in the preservation of implant sites and provide a certain reference for the clinical application value of domestic barrier membrane.Methods:A total of 28 patients requiring implantation site preservation were selected.The patients were divided into experimental group and control group by random envelope method,with 14 cases in each group.The experimental group was treated with Lando? absorbable collagen membrane for site preservation,while the control group was treated with Swiss bio-gide ? absorbable collagen membrane.Swiss bio-oss ? bone meal was used as bone graft material for alveolar fossa in both groups.All patients underwent CBCT imaging examination on the day after tooth extraction surgery and on the 26 th weekend after surgery,and the data were imported into the medical imaging software Mimics in DICOM format for measurement.In terms of clinical examination,the wound healing of the two groups 2 weeks and 8 weeks after surgery was compared.The bone changes of alveolar ridge width and height on the day after implantation site preservation and 26 weeks after surgery were compared in each group.The clinical effectiveness of the two types of absorbable collagen membranes was compared by the results of wound healing and bone mass maintenance.Results:1.Incision healing.Two weeks after the operation,grade A healing rate of the experimental group and the control group were 57.14% and 64.29%,respectively,and Grade B healing rate were 42.86% and 35.71%.According to Fisher's exact probability test,P=0.77,there was no statistically significant difference between the two groups.Eight weeks after the operation,the incision healing grade of the experimental group and the control group reached grade a.Two weeks after the operation,there was no overflow of bone graft material to the tooth extraction fossa and abnormal secretion outflow from the incision area.There was no redness,indentation,hematoma and effusion infection in the operative area.At 8 weeks after the operation,no abnormal manifestations such as granulation tissue hyperplasia and immune rejection were observed.By the end of observation,all the cases had no physical discomfort.2.By analyzing the changes in the width and height of the alveolar ridge,it was found that the width and height of the alveolar ridge in the two groups were absorbed at 26 weeks after surgery compared with those before surgery.At 1,4,and 7mm below the alveolar crest,bone mass loss in the experimental group was 2.01±1.39 mm,1.05±0.83 mm,and 0.48±1.39 mm,respectively.The control group was 1.82±1.25 mm,0.89±0.64 mm,and 0.33±0.60 mm,respectively.There was no significant difference between the groups(P>0.05).In the labial buccal side,palatal lingual side,near middle and far middle,the bone mass loss in the height of the experimental group was1.16±0.86 mm,0.82±1.18 mm,0.32±0.73 mm,and 0.41±0.64 mm,respectively.The control group was 1.06±0.93 mm,0.77±0.73 mm,0.30±0.50 mm,and 0.56±0.94 mm,respectively.There was no statistical difference between the groups(P>0.05)Conclusion:In this clinical study,the absorbable collagen membrane of Lando? was used in the implantation site preservation surgery.There was no statistical difference between the bone changes in the width and height of the alveolar crest and the healing of the incision and that of the bio-gide ? absorbable collagen membrane group,indicating that the clinical effect of the absorbable collagen membrane of Lando? and the imported bio-gide ? absorbable collagen membrane was similar.With no obvious adverse reactions,Lando? absorbable collagen membrane group can be safely applied in clinical oral implant site preservation. |
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