| ObjectivesThe aim of this study was to investigate the influence of remaining bone height(RBH),sinus width(SW)and Schneider membrane thickness(MT)on bone resorption rate in sinuses after lateral sinus augmentation,which was based on linear and volumetric change over a 2-year period.MethodsEighty three patients with a mean age of 53.66±12.32 years enrolled in this study,each underwent lateral sinus augmentation using deproteinized bovine bone mineral(DBBM).Study data were collected from patients and by analyzing cone beam computed tomography(CBCT)scans taken pre-operation(Tpr),immediately after grafting(Tpo),six months after grafting(T1),one year after grafting(T2),two years after grafting(T3).Incidences were recorded.A life-table analysis was used to assess the implant survival rate.Liner and volumetric evaluations were applied to evaluate the graft bone resorption rate.ResultsThe cumulative survival rate was 98.32%by implant-based analysis.The rate was 97.59%by patient-based analysis.Bone height(BH)was 15.91±0.30 mm at Tpo and 13.64±0.61 mm at T3(P<0.05).The liner bone resorption rate of bone height(BHLGR)was 11.36±3.97%at T3.A positive association between MT and liner bone resorption rate of graft height(GHLGR)at T2(r=0.55,p=0.05).The BHLGR of group of MT>3 mm was significant lower than group of MT<3 mm at T1(p=0.03).The GHLGR of group MT>3 mm was significant lower than group MT<3 mm at T1(p=0.021).Graft bone volume was 1352.07(984.36;1855.35)mm3 at Tpo and 1029.97(666.88;1781.78)mm3 at T3(P<0.05).Volumetric graft bone resorption rate(GR)was 20.07±3.32%at T3.Negative associations between SW and GR were found at T2 and T3(r=-0.90,p=0.01;r=-0.66,p=0.04).ConclusionsNo relationship between RBH and bone resorption was found in this study.MT higher than 3 mm may reduce early bone resorption in sinus after lateral augmentation.Volumetric graft bone resorption may be negatively associated with SW at T2 and T3,but this still remained to be explored. |
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