title: Clinical study on the primary stability of two dental implant systems with resonance frequency analysis.
abstract: Primary stability has a major impact on the long-term success of dental implants. The aim of this study was to investigate the correlation of resonance frequency analysis (RFA) and insertion torque of self-tapping and non-self-tapping implants and their respective differences in primary stability. A group of 263 patients were treated with a total of 602 conically formed dental implants: 408 non-self-tapping Ankylos and 194 self-tapping Camlog. The maximum insertion torque during implant placement was recorded. Resonance frequency, measured as the implant stability quotient (ISQ), was assessed once immediately after insertion and twice 3 months later. Torque values of the non-self-tapping implants were significantly higher than those in the self-tapping group (p = 0.023). RFA did not show differences between the 2 groups (p = 0.956), but a correlation between ISQ values after implantation and 3 months after implant placement was measured (r = 0.712). Within the implant systems, no correlation between insertion torque and resonance frequency values could be determined (r = 0.305). Our study indicates that the ISQ values obtained from different implant systems are not comparable. The RFA does not appear suitable for the evaluation of implant stability when used as a single method. Higher insertion torque of the non-self-tapping implants appeared to confirm higher clinical primary stability.
authors.affiliation: Department of Oral Medicine, Dental Radiology and Surgery, Charité Center 3 for Dental Medicine, Campus Benjamin Franklin, Charité-Medical University Berlin, Assmannshauser Strasse 4-6, 14197, Berlin, Germany. annette.rabel@charite.de
authors.forename: Annette
authors.initials: A
authors.lastname: Rabel
authors.forename: Steffen Gerhard
authors.initials: SG
authors.lastname: Köhler
authors.forename: Andrea Maria
authors.initials: AM
authors.lastname: Schmidt-Westhausen
mesh_terms: D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D015519:Bone Density / Q000502:physiology; D003758:Dental Implantation, Endosseous / Q000379:methods; D015921:Dental Implants; D017267:Dental Prosthesis Design; D017268:Dental Prosthesis Retention; D005260:Female; D006801:Humans; D008297:Male; D008334:Mandible / Q000601:surgery; D008437:Maxilla / Q000601:surgery; D008875:Middle Aged; D016348:Osseointegration / Q000502:physiology*; D013499:Surface Properties; D019415:Torque; D014159:Transducers
chemical_list: D015921:Dental Implants