Bone Resorption And Soft Tissue Around The Implants Of Nobel Replace Groovy In The Posterior Area After 1-3 Years:a Retrospective Cross-sectional Study

[Objectives]The research project was conducted to assess the marginal bone loss of peri-implants within 1 to 3 years following the implant restoration in the posterior region,using the bone level implants-Nobel Replace Groovy,which was designed without platform shifting,and analyze the possible influence factors on peri-implant bone resorption.Efforts were made to quantify the peri-implant alveolar bones and soft tissues through the cone beam computed tomograph(CBCT),analyze the correlations and then verify the theory of peri-implant biological width.[Methods]Altogether 69 patients,with a total of 131 implants,received conventional implant restoration in the posterior region with Nobel Replace Groovy implants in the Graft Production Center of Zhejiang Stomatology Hospital between May 2012 and April 2014,were included in the project.Oral panoramic radiograph(OPG)taken immediately after the operation andl to 3 years after the restoration,in a bid to measure the marginal bones at mesial and distal sites,and to ascertain the marginal bone loss.CBCT were made among 55 patients,with 99 implants in all.Measurement was made of the gingival height from the alveolar crest to the gingival margin,the gingival thickness at the alveolar crest,and the width of alveolar bones 1mm,3mm and 5mm under the alveolar crest and vertical to the implant long axis.SPSS 17.0 software was used for statistical analysis.[Results]According to measurement by oral panoramic radiograph,marginal bone loss at mesial and distal sites were(1.35±1.08)mm and(1.36±1.06)mm on average,showimg good effect.however,more than 2mm accounted for 27.48%and 23.67%.With the application of SPSS 17.0 software,statistical analysis was made of the marginal bone loss.There was statistically significant differences(p<0.05)between diabetic and nondiabetic patients,thick and thin gums,maxillary and mandible and the difference of place depths.According to CBCT examinations,the gingival height from the alveolar crest to the gingival margin at buccal and lingual(palatal)sites was(2.62±0.71)mm and(2.69±0.78)mm on average;the gingival thickness at the alveolar crest of the buccal and lingual(palatal)was(2.23±0.96)mm and(2.46±1.25)mm on average.Pearson correlation analysis was made of the gingival height from the alveolar crest respectively to the gingival margin,the gingival thickness at the alveolar crest,and the width of alveolar bones 1mm,3mm and 5mm under the alveolar crest and vertical to the implant long axis.The results showed that the buccal gingival height was related to the thickness of the buccal gingiva,and the thickness of the buccal gingiva was related to the width of alveolar bones 1mm,3mm and 5mm under the alveolar crest and vertical to the implant long axis at buccal;and at lingual(palatal)sites,they were unexceptionally correlated[Conclusions]Nobel Replace Groovy implants achieve desirable implantation outcomes in the posterior region.The biological width of implants is a three-dimensional idea.There is positive correlation between soft and hard tissues.