title: Marginal bone level changes and implant stability after loading are not influenced by baseline microstructural bone characteristics: 1-year follow-up.
abstract: OBJECTIVE
  The aim of this study was to investigate the influence of different bone tissue characteristics of implant sites on changes in marginal bone level and implant stability over time.
  
  
  METHODS
  One hundred and one implants were inserted in 41 patients. Cortical bone thickness of the alveolar ridge was measured on computed tomography (CT) images. Histomorphometric and microtomographic analyses (microCT) were performed in bone specimens obtained by using a trephine bur, at first drilling. Implant stability quotient (ISQ) measured by resonance frequency analysis (RFA) was registered at implant insertion. Implant stability quotient was measured also at the stages of uncovering, loading and at the 1-year follow-up, when standardized periapical radiographs were taken to measure the marginal bone level (MBL). Descriptive statistics, Spearman's rho correlation and multiple linear regression were used for data analysis (P < 0.05).
  
  
  RESULTS
  Comparison between groups of higher and lower values of ISQ changes and between groups of higher and lower values of MBL changes revealed no differences in histomorphometric and microtomographic parameters, according to non-parametric comparison tests, (P > 0.05). Bivariate correlation also showed no association among these microstructural parameters and the outcomes evaluated. There was no correlation between cortical thickness and MBL changes (r = -0.029; P = 0.832) and between cortical thickness and ISQ changes (r = 0.145; P = 0.292).
  
  
  CONCLUSIONS
  Microstructural bone characteristics of implant sites have no effect on changes in marginal bone level and implant stability as measured by RFA. Bone morphology cannot predict implant treatment success over time.
authors.affiliation: Department of Oral Medicine, School of Dentistry, Federal University of Goias, Goiania, Goias, Brazil.
authors.forename: Danilo Rocha
authors.initials: DR
authors.lastname: Dias
authors.affiliation: Department of Prevention and Oral Rehabilitation, School of Dentistry, Federal University of Goias, Goiania, Goias, Brazil.
authors.forename: Cláudio Rodrigues
authors.initials: CR
authors.lastname: Leles
authors.affiliation: Department of Oral and Maxillofacial Radiology, Faculty of Odontology, Malmö University, Malmö, Sweden.
authors.forename: Christina
authors.initials: C
authors.lastname: Lindh
authors.affiliation: Department of Oral Medicine, School of Dentistry, Federal University of Goias, Goiania, Goias, Brazil. rejanefrr@gmail.com.
authors.forename: Rejane Faria
authors.initials: RF
authors.lastname: Ribeiro-Rotta
mesh_terms: D000328:Adult; D016301:Alveolar Bone Loss / Q000000981:diagnostic imaging; D015519:Bone Density; D003758:Dental Implantation, Endosseous; D015921:Dental Implants; D019232:Dental Restoration Failure; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D016014:Linear Models; D008297:Male; D008875:Middle Aged; D016348:Osseointegration; D011859:Radiography
chemical_list: D015921:Dental Implants
keywords: alveolar bone loss; dental implants; implant stability