title: Preparation time and sealing effect of cavities prepared by an ultrasonic device and a high-speed diamond rotary cutting system.
abstract: The purpose of this study was to compare a high-speed handpiece to an ultrasonic device regarding the time taken for cavity preparation in bovine incisor teeth (n = 12), and to evaluate microleakage after the restorations. Two cylindrical cavities each were prepared on the labial surfaces of 12 teeth. One of them was made with a diamond tip in group 1 (G(1) = 12) coupled with a high-speed handpiece, and the other with a chemical vapor deposition (CVD) tip in group 2 (G(2) = 12) coupled with an ultra-sound device (n = 24). The time taken for each preparation was measured with a stopwatch. The cavities were treated with adhesive (Scotchbond Multipurpose, 3M), restored with composite (Filtek Z250, 3M), finished and polished, and then the prepared teeth were immersed in a 50% silver nitrate solution. The samples were cut in the mesio-distal direction and evaluated for microleakage. Data were analyzed using the Wilcoxon test (P < 0.01). The results revealed that the time taken to prepare cavities was 7.9 times shorter in G(1). There was no microleakage in 100% of the samples indicated by the absence of dye penetration in G(1), and 46% in G(2). It was concluded that the performance of the high-speed handpiece was better than that of the oscillatory system, in terms of both the time taken for preparation and the microleakage.
authors.affiliation: Department of Pediatric Dentistry and Orthodontics, School of Dentistry, Federal University of Rio de Janeiro, Brazil.
authors.forename: Aurea S B
authors.initials: AS
authors.lastname: Vieira
authors.forename: Márcia P A
authors.initials: MP
authors.lastname: dos Santos
authors.forename: Lívia A A
authors.initials: LA
authors.lastname: Antunes
authors.forename: Laura G
authors.initials: LG
authors.lastname: Primo
authors.forename: Lucianne C
authors.initials: LC
authors.lastname: Maia
mesh_terms: D000818:Animals; D002417:Cattle; D003188:Composite Resins; D003737:Dental Cavity Preparation / Q000295:instrumentation*; D003754:Dental High-Speed Equipment; D003763:Dental Leakage / Q000517:prevention & control*; D003793:Dental Restoration, Permanent / Q000379:methods; D018130:Diamond; D019279:Resin Cements; D013997:Time Factors; D014465:Ultrasonics
chemical_list: D003188:Composite Resins; C444701:Filtek Z250; D019279:Resin Cements; C084018:Scotchbond Multi-Purpose; D018130:Diamond