Early-stage Bone Loss Of Different Densities Of Jaw Type After Dental Implants

Purpose The shape and quality of alveolar bone in the missing tooth area is one of the most important factors affecting the success rate of implantation,and the failure rate of type IV bone is higher.In addition,the health of the soft and hard tissue around the implant also determines the success of the implant operation.Progressive marginal bone loss is one of the important causes of other diseases such as peri-implantitis.At present,there are few studies on the differences in bone loss of implant margins between different densities of jaw types measured by jaw quality.This experiment measures the difference in bone loss around the implant with patients which has different jaw bone densities in the missing tooth area,and not loaded for six months after dental implantation.METHOD70 patients with loss of a maxillary posterior tooth were included in this study.According to different bone densities,these patients were divided into TypeⅠgroup(23 cases,with 24 implants),TypeⅡ/Ⅲgroup(28 cases,with 30 implants),and TypeⅣgroup(23 cases,with 25 implants).The differences in early-stage bone resoprtion among the patients with different bone densities were compared by measuring the CBCT imaging data of these patients on the day of dental implants and six months after dental implants.RESULTS: 1.When unloaded six months after implantation,the bone loss of the mesial,distant,buccal,and lingual bones in the type I group was(0.41 ± 0.23)mm,(0.21 ± 0.26)mm,and(0.28 ± 0.26)mm,(0.33 ± 0.22)mm,respectively.And the bone loss of the mesial,distant,buccal,and lingual bones in theⅡ/Ⅲbone group were(0.52 ± 0.29)mm,(0.43 ± 0.34)mm,(0.36 ± 0.36)mm,and(0.33 ± 0.34)mm.The bone loss of mesial,distant,buccal,and lingual bones in the type IV bone group was(0.63 ±0.31)mm,(0.80 ± 0.40)mm,(0.80 ± 0.44)mm,(0.57 ± 0.23)mm2.The average amount of bone loss at the mesial,mesial,and buccal-lingual sides of the type I bone group was(0.31 ± 0.20)mm and(0.30 ± 0.21)mm,at half a year after implantation.For type II / III the mean amount of bone loss in buccal and lingual sides was(0.48 ± 0.27)mm and(0.34 ± 0.31)mm.The mean values of bone loss in mesial,mesial,buccal and lingual sides of group IV group were(0.71 ± 0.29)mm,(0.68 ± 0.24)mm.3.The MBL of the type I group was(0.31 ± 0.16)mm,the MBL of the type II / III group was(0.41 ± 0.25)mm,and the MBL of the type IV group was(0.68 ± 0.24)mm.CONCLUSION: With no load six months after dental implants,the bone loss around the implants of TypeⅣgroup was significantly greater than that in groupⅠ,groupⅡ/Ⅲ.Therefore for groupⅣ,GBR should be performed simultaneously with implant surgery.