title: Histologic and biomechanical evaluation of the effects of implant insertion torque on peri-implant bone healing.
abstract: The aim of this study was to evaluate histologically and biomechanically the peri-implant bone healing around implants placed with high torque after a follow-up of 8 and 12 weeks. A total of 12 implants were placed in the lower edge of the mandible of 2 sheep. In each sheep, 3 implants were placed with a low torque (<25 N · cm, LT group) as a control, and 3 implants were placed with a high insertion torque (maximum torque, HT group). The sheep were killed after 8 and 12 weeks of healing, and the implants were examined for removal torque, resonance frequency analysis, and histologic analysis.The mean insertion torque in the LT group was 24 N · cm, whereas it was 105.6 N · cm in HT. All the implants osseointegrated and histologic analysis showed similar aspects of the peri-implant bone tissue for both groups and both healing times. Mean removal torque values for LT implants were 159.5 and 131.5 N · cm after 8 and 12 weeks, respectively, whereas those for the HT were 140 and 120 N · cm at 8 and 12 weeks, respectively. Implant stability quotient values were 26.6 and 76 for the LT group and 74 and 76 for the HT group at 8 and 12 weeks, respectively.It could be concluded that high implant insertion torque does not induce adverse reaction in cortical bone and does not lead to implant failure.
authors.affiliation: Università degli Studi diModena e Reggio Emilia, Sweden. librochirurgia@gmail.com
authors.forename: Ugo
authors.initials: U
authors.lastname: Consolo
authors.forename: Domenico
authors.initials: D
authors.lastname: Travaglini
authors.forename: Marzio
authors.initials: M
authors.lastname: Todisco
authors.forename: Paolo
authors.initials: P
authors.lastname: Trisi
authors.forename: Silvia
authors.initials: S
authors.lastname: Galli
mesh_terms: D000818:Animals; D001696:Biomechanical Phenomena; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D004195:Disease Models, Animal; D005260:Female; D008334:Mandible / Q000473:pathology / Q000601:surgery*; D016348:Osseointegration / Q000502:physiology*; D012756:Sheep; D019415:Torque; D014732:Vibration; D014945:Wound Healing / Q000502:physiology*
chemical_list: D015921:Dental Implants