Alveolar Bone Changes Of Intra-bony And No Intra-bony Defects Patients On CBCT After Socket Preservation

Objective: Alveolar bone reduction is significant after tooth extraction.The aim of this study was to determine socket preservation in patients with intra-bony defects would prevent resorptive changes after extraction.Materials and methods: Atotal of 80 teeth,37 males and 25 females,aged of20 to 65,was divided into 2 groups;Group I(n=40): 40 extraction sockets with socket preservation(test group)and Group II(n=40): 40 extraction sockets without socket preservation(control group).Each group was subdivided into 4groups;Group A-10 extraction sockets with one-wall bone defects after tooth extraction,Group B-10 extraction socketswith two-wall bone defects after tooth extraction,Group C-10 extraction sockets with three-wall bone defects after tooth extraction andGroup D-10 extraction sockets with four-wall bone defects after tooth extraction.All the patients in test group underwent to augment alveolar bone with 10% collagen matrix(BioOss Collagen)after tooth extraction without membrane and followed up after 6 months.Alveolar bone height and width measurements of both groups were done on CBCT.Result:(1)Mean bone heights increased in all test groups,2.92 ? 2.63 mm in Group A1,3.75 ? 3.33 mm in Group B1,2.04 ? 2.95 mm in Group C1 and1.82 ? 2.97 mm in Group D1,but control groups lost average 1-1.5 mm buccal and lingual bone.In the test groups,Group A1,B1,C1 and D1 were increased3.73 mm,4.45 mm,1.38 mm and 1.25 mm than that of control groups respectively.There were significant differences between test and control groups(P<0.05).(2)Mean alveolar bone widths gained in all test groups except in Group D1?Group A1 gained 3.76 ? 2.55 mm,Group B1 gained 4.1 ? 3.13 mm,Group C1 gained 2.26 ? 2.2 mm of bone width,and Group D1 lost-0.87 ? 1.11 mm of bone widthwhile all control groups showed horizontal bone loss.There were significant differences between test and control groups(P<0.05).(3)When compared with estimated original bone contour,average72.79%in Group A1,75.52% in Group B1,78.08% in Group C1 and 88.08% in Group D1 of test group were restored on 6 months after baseline.Average percentages of bone width regeneration in control group were in 57.20% Group A0,69.92%in Group B0,81.62% in Group C0 and 84.91% in Group D0.The average percentage of bone width regeneration in control group was lower than that of test group except in Group C.Conclusions: Socket preservation technique is very useful and can prevent the bone loss from tooth extraction and can even augment the alveolar bone dimension in patients with intra-bony defect.According to our findings,(1)It is obvious socket preservation had more effectiveness on both intra-bony defect and no intra-bony defect patients than those of control group.(2)The restoration of alveolar bone dimension also depends on remaining bone wall around the bone graft.The more the number of bone wall,the more the amount of bone width restoration.(3)Socket preservation would prevent resorptive changes in intra-bony defect patients after extraction.