title: Pulpal temperature increase with high-speed handpiece, Er:YAG laser and ultrasound tips.
abstract: The aim of this study was to compare intrapulpal temperature increase produced by high-speed handpiece, Er:YAG laser and CVDentus ultrasound tips during cavity preparation. Thirty bovine mandibular incisors with an enamel/dentin thickness of 4 mm at buccal surface had their roots amputated and were allocated to the following groups (n=10): Group I- high-speed handpiece; Group II- noncontact Er:YAG laser (250 mJ/4 Hz); and Group III- CVDentus ultrasouns tips. All devices were used with water cooling. Class V cavities were prepared to a depth of 3.5 mm, measured with a periodontal probe. A type T thermocouple was placed inside the pulp chamber to determine the temperature increase (degrees C), which was recorded by a data acquisition system ADS 2000 IP (Lynx Technology) linked to a notebook computer. Data were analyzed statistically by one-way ANOVA and Tukey's test (p=0.05). The mean temperature rises were: 1.10 degrees C (+/-0.56) for Group I, 0.84 degrees C (+/-0.55) for Group II, and 3.00 degrees C (+/- 1.34) for Group III. There were no statistically significant differences (p>0.05) between Groups I and II, but both of them differed significantly from Group III (p<0.05). In conclusion, the use of Er:YAG laser and high-speed handpiece for cavity preparation resulted in similar temperature increase. Although ultrasound tips generated significantly higher intrapulpal temperature increase, it remained below the critical value of 5.5 degrees C and may be considered safe for use.
authors.affiliation: Department of Restorative Dentistry, São Paulo State University, São Paulo, Brazil. fernandapelogia@hotmail.com
authors.forename: Fernanda Brandão
authors.initials: FB
authors.lastname: Mollica
authors.forename: Fernanda Pelogia
authors.initials: FP
authors.lastname: Camargo
authors.forename: Sandra Costa
authors.initials: SC
authors.lastname: Zamboni
authors.forename: Sarina Maciel Braga
authors.initials: SM
authors.lastname: Pereira
authors.forename: Symone Cristina
authors.initials: SC
authors.lastname: Teixeira
authors.forename: Lafayette
authors.initials: L
authors.lastname: Nogueira
mesh_terms: D000818:Animals; D001831:Body Temperature; D002417:Cattle; D003737:Dental Cavity Preparation / Q000009:adverse effects / Q000295:instrumentation*; D003754:Dental High-Speed Equipment / Q000009:adverse effects*; D003782:Dental Pulp / Q000502:physiology*; D004869:Equipment Safety; D053844:Lasers, Solid-State / Q000009:adverse effects*; D014465:Ultrasonics / Q000009:adverse effects*