title: Development of implant stability during early healing of immediately loaded implants.
abstract: OBJECTIVE
  To monitor the development of stability of immediately loaded implants during early healing.
  
  
  METHODS
  A total of 90 interforaminally placed implants with an alkali-treated surface were considered. The stability of each implant was examined at placement and 1, 2, 3, 4, 5, 6, 8, and 10 weeks after the surgery using resonance frequency analysis (RFA) and damping capacity measurement. The development of implant stability, focusing on the decrease in stability (as measured by implant stability quotient [ISQ]) and the interplay of primary (ISQ0) and secondary implant stability, was evaluated. The implants were divided into three groups based on primary stability: group L (ISQ0 < 68), group M (ISQ0 68 to72), and group H (ISQ0 > 72). Stability curves for each group were created and analyzed statistically. Implant stability measurement results gained with RFA and damping capacity were compared employing the Wilcoxon paired test, correlation coefficients, and regression analysis. The threshold for statistical significance was set at P < .05.
  
  
  RESULTS
  The most pronounced decrease in ISQ values occurred 1 week after implant placement (mean decrease of 2.2 ISQ). During the 10-week experiment, mean ISQ rose by 5.5 in group L and by 1.3 in group M and dropped by 1.8 in group H (P < .001). The coefficient of determination R2 = 0.06 showed a weak dependence of RFA on the damping capacity (P < .001).
  
  
  CONCLUSIONS
  Implants with low primary stability showed a significant increase in stability during healing. In contrast, implants with high primary stability lost some stability over time.
authors.affiliation: Department of Dentistry, Charles University in Prague, Faculty of Medicine in Hradec Kralove, Czech Republic. simunek@email.cz
authors.forename: Antonin
authors.initials: A
authors.lastname: Simunek
authors.forename: Dana
authors.initials: D
authors.lastname: Kopecka
authors.forename: Tomas
authors.initials: T
authors.lastname: Brazda
authors.forename: Iakub
authors.initials: I
authors.lastname: Strnad
authors.forename: Lukas
authors.initials: L
authors.lastname: Capek
authors.forename: Radovan
authors.initials: R
authors.lastname: Slezak
mesh_terms: D000368:Aged; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D005260:Female; D006801:Humans; D057893:Immediate Dental Implant Loading; D008297:Male; D008334:Mandible / Q000601:surgery; D063168:Mandibular Osteotomy; D008875:Middle Aged; D016348:Osseointegration; D011446:Prospective Studies; D012044:Regression Analysis; D018709:Statistics, Nonparametric; D013499:Surface Properties; D014732:Vibration; D014945:Wound Healing
chemical_list: D015921:Dental Implants