title: Effect of pre-drilling on intraosseous temperature during self-drilling mini-implant placement in a porcine mandible model.
abstract: This in vitro study investigated intraos seous heat production during insertion, with and without pre-drilling, of a self-drilling orthodontic mini-implant. To measure temperature changes and drilling times in pig ribs, a special testing apparatus was used to examine new and worn pre-drills at different speeds. Temperatures were measured during mini-implant placement with and without pre-drilling. The average intraosseous temperature increase during manual mini-implant insertion was similar with and without pre-drilling (11.8 ± 2.1°C vs. 11.3 ± 2.4°C, respectively; P = 0.707). During pre-drilling the mean temperature increase for new drills was 2.1°C at 100 rpm, 2.3°C at 200 rpm, and 7.6°C at 1,200 rpm. Temperature increases were significantly higher for worn drills at the same speeds (2.98°C, 3.0°C, and 12.3°C, respectively), while bone temperatures at 100 and 200 rpm were similar for new and worn drills (P = 0.345 and 0.736, respectively). Baseline bone temperature was approximated within 30 s after drilling in most specimens. Drilling time at 100 rpm was 2.1 ± 0.9 s, but was significantly shorter at 200 rpm (1.1 ± 0.2 s) and 1,200 rpm (0.1 ± 0.03 s). Pre-drilling did not decrease intraosseous temperatures. In patients for whom pre-drilling is indicated, speeds of 100 or 200 rpm are recommended, at least 30 s after pilot drilling.
authors.affiliation: Department of Paediatric and Adolescent Dentistry, University of Pécs.
authors.forename: Zsuzsanna
authors.initials: Z
authors.lastname: Gurdán
authors.forename: László
authors.initials: L
authors.lastname: Vajta
authors.forename: Ákos
authors.initials: Á
authors.lastname: Tóth
authors.forename: Edina
authors.initials: E
authors.lastname: Lempel
authors.forename: Árpád
authors.initials: Á
authors.lastname: Joób-Fancsaly
authors.forename: József
authors.initials: J
authors.lastname: Szalma
mesh_terms: D000818:Animals; D015921:Dental Implants; D066298:In Vitro Techniques; D008334:Mandible / Q000503:physiopathology / Q000601:surgery*; D023421:Models, Animal; D013552:Swine; D013696:Temperature
chemical_list: D015921:Dental Implants