title: The combined effects of undersized drilling and implant macrogeometry on bone healing around dental implants: an experimental study.
abstract: This study investigated the effect of undersized preparations with two different implant macrogeometries. There were four experimental groups: group 1, conical implant with an undersized osteotomy of 3.2mm; group 2, conical implant with an undersized osteotomy of 3.5mm; group 3, cylindrical implant with an undersized osteotomy of 3.2mm; group 4, cylindrical implant with an undersized osteotomy of 3.5mm. Implants were placed in one side of the sheep mandible (n=6). After 3 weeks, the same procedure was conducted on the other side; 3 weeks later, euthanasia was performed. All implants were 4mm×10mm. Insertion torque was recorded for all implants during implantation. Retrieved samples were subjected to histological sectioning and histomorphometry. Implants of groups 1 and 2 presented significantly higher insertion torque than those of groups 3 and 4 (P<0.001). No differences in bone-to-implant contact or bone area fraction occupied were observed between the groups at 3 weeks (P>0.24, and P>0.25, respectively), whereas significant differences were observed at 6 weeks between groups 1 and 2, and between groups 3 and 4 (P<0.01). Undersized drilling affected the biological establishment of bone formation around both dental implant macrogeometries.
authors.affiliation: Department of Prosthodontics, Faculty of Odontology, Malmö University, Malmö, Sweden. Electronic address: ryo.jimbo@mah.se.
authors.forename: R
authors.initials: R
authors.lastname: Jimbo
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
authors.forename: N
authors.initials: N
authors.lastname: Tovar
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
authors.forename: R B
authors.initials: RB
authors.lastname: Anchieta
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
authors.forename: L S
authors.initials: LS
authors.lastname: Machado
authors.affiliation: Department of Dentistry, UNIGRANRIO, Duque de Caxias, RJ, Brazil.
authors.forename: C
authors.initials: C
authors.lastname: Marin
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
authors.forename: H S
authors.initials: HS
authors.lastname: Teixeira
authors.affiliation: Department of Biomaterials and Biomimetics, New York University College of Dentistry, New York, NY, USA.
authors.forename: P G
authors.initials: PG
authors.lastname: Coelho
mesh_terms: D000818:Animals; D003758:Dental Implantation, Endosseous / Q000379:methods*; D015921:Dental Implants; D017267:Dental Prosthesis Design; D020007:Implants, Experimental; D008334:Mandible / Q000601:surgery*; D016348:Osseointegration; D010027:Osteotomy; D012756:Sheep; D013499:Surface Properties; D019415:Torque
chemical_list: D015921:Dental Implants
keywords: conical implants; cylindrical implants; undersized preparation