title: Torque-fitting and resonance frequency analyses of implants in conventional sockets versus controlled bone defects in vitro.
abstract: The primary stability of implants should be high on insertion into fresh extraction sockets. Torque-fitting and resonance frequency analyses (RFA) are used to assess primary implant anchorage and stability. The torque-fitting and RFA of implants placed in conventional surgical sockets and sockets with controlled coronal bone defects was compared. The possible relation between torque-fitting and RFA was explored. Ø 3.3 mm x 12 mm implants were placed in 16 sockets finalized with Ø 2.8mm surgical pilot drills in the right iliac crests of two fresh cadavers (control). In the test group, implants were placed into sockets prepared by Ø 2.8mm drill followed by Ø 4.2mm twist drills to a depth of 6mm to create circumferential controlled coronal bone defects (50% bone loss). Primary implant stability was assessed using insertion torque values (ITV) followed by RFA. Mean ITV and RFA measurements for test groups (7.83+/-0.91 N cm and 40.88+/-3.57) were significantly lower than controls (14.80+/-1 N cm and 66.31+/-0.9) (P<0.05). Reductions of ITV and RFA measurements in relation to bone defect were 47% and 38%. The existence of controlled bone defects eliminating contact coronally leads to decrease in torque-fitting and primary stability of implants. No relationship was observed between torque-fitting and RFA.
authors.affiliation: Department of Prosthodontics, Faculty of Dentistry, Hacettepe University, 06100 Sihhiye, Ankara, Turkey.
authors.forename: K
authors.initials: K
authors.lastname: Akça
authors.forename: A M
authors.initials: AM
authors.lastname: Kökat
authors.forename: A
authors.initials: A
authors.lastname: Cömert
authors.forename: M
authors.initials: M
authors.lastname: Akkocaoğlu
authors.forename: I
authors.initials: I
authors.lastname: Tekdemir
authors.forename: M C
authors.initials: MC
authors.lastname: Cehreli
mesh_terms: D000368:Aged; D015519:Bone Density / Q000502:physiology; D001862:Bone Resorption / Q000473:pathology / Q000601:surgery*; D001842:Bone and Bones / Q000473:pathology / Q000601:surgery*; D002102:Cadaver; D003758:Dental Implantation, Endosseous / Q000295:instrumentation / Q000379:methods*; D015921:Dental Implants; D017268:Dental Prosthesis Retention; D006801:Humans; D007085:Ilium; D008297:Male; D010027:Osteotomy / Q000295:instrumentation; D013499:Surface Properties; D019415:Torque; D014732:Vibration
chemical_list: D015921:Dental Implants