Effect of cooling water temperature on the temperature changes in pulp chamber and at handpiece head during high-speed tooth preparation
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Objectives: It was the aim of this study to evaluate the effect of cooling water temperature on the temperature changes in the pulp chamber and at the handpiece head during high-speed tooth preparation using an electric handpiece. Materials and Methods: Twenty-eight intact human molars received a standardized occlusal preparation for 60 seconds using a diamond bur in an electric handpiece, and one of four treatments were applied that varied in the temperature of cooling water applied (control, with no cooling water, 10°C, 23°C, and 35°C). The temperature changes in the pulp chamber and at the handpiece head were recorded using K-type thermocouples connected to a digital thermometer. Results: The average temperature changes within the pulp chamber and at the handpiece head during preparation increased substantially when no cooling water was applied (6.8°C and 11.0°C, respectively), but decreased significantly when cooling water was added. The most substantial drop in temperature occurred with 10°C water (−16.3°C and −10.2ºC), but reductions were also seen at 23°C (−8.6°C and −4.9°C). With 35°C cooling water, temperatures increased slightly, but still remained lower than the no cooling water group (1.6°C and 6.7ºC). Conclusions: The temperature changes in the pulp chamber and at the handpiece head were above harmful thresholds when tooth preparation was performed without cooling water. However, cooling water of all temperatures prevented harmful critical temperature changes even though water at 35°C raised temperatures slightly above baseline.
Abstract
Objectives: It was the aim of this study to evaluate the effect of cooling water temperature on the temperature changes in the pulp chamber and at the handpiece head during high-speed tooth preparation using an electric handpiece. Materials and Methods: Twenty-eight intact human molars received a standardized occlusal preparation for 60 seconds using a diamond bur in an electric handpiece, and one of four treatments were applied that varied in the temperature of cooling water applied (control, with no cooling water, 10°C, 23°C, and 35°C). The temperature changes in the pulp chamber and at the handpiece head were recorded using K-type thermocouples connected to a digital thermometer. Results: The average temperature changes within the pulp chamber and at the handpiece head during preparation increased substantially when no cooling water was applied (6.8°C and 11.0°C, respectively), but decreased significantly when cooling water was added. The most substantial drop in temperature occurred with 10°C water (−16.3°C and −10.2ºC), but reductions were also seen at 23°C (−8.6°C and −4.9°C). With 35°C cooling water, temperatures increased slightly, but still remained lower than the no cooling water group (1.6°C and 6.7ºC). Conclusions: The temperature changes in the pulp chamber and at the handpiece head were above harmful thresholds when tooth preparation was performed without cooling water. However, cooling water of all temperatures prevented harmful critical temperature changes even though water at 35°C raised temperatures slightly above baseline.
참고문헌 (30)
- Lloyd BA, "Effect of cooling techniques on temperature control and cutting rate for high-speed dental drills", J Dent Res, 57, pp.675~684 (1978)
- Laforgia PD, "Temperature change in the pulp chamber during complete crown preparation", J Prosthet Dent, 65, pp.56~61 (1991)
- Lefkowitz W, "Pulp response to cavity preparation", J Prosthet Dent, 8, pp.315~324 (1958)
- Cavalcanti BN, "High-speed cavity preparation techniques with different water flows", J Prosthet Dent, 87, pp.158~161 (2002)
- Öztürk B, "In vitro assessment of temperature change in the pulp chamber during cavity preparation", J Prosthet Dent, 91, pp.436~440 (2004)
- Ercoli C, "In vitro comparison of the cutting efficiency and temperature production of 10 different rotary cutting instruments. Part I: turbine", J Prosthet Dent, 101, pp.248~261 (2009)
- Galindo DF, "Tooth preparation: a study on the effect of different variables and a comparison between conventional and channeled diamond burs", J Prosthodont, 13, pp.3~16 (2004)
- Lauer HC, "Effects of the temperature of cooling water during high-speed and ultrahigh-speed tooth preparation", J Prosthet Dent, 63, pp.407~414 (1990)
- Siegel SC, "Irrigation rates and handpieces used in prosthodontic and operative dentistry : results of a survey of North American dental school teaching", J Prosthodont, 9, pp.82~86 (2000)
- von Fraunhofer JA, "Handpiece coolant flow rates and dental cutting", Oper Dent, 25, pp.544~548 (2000)
- International Organization for Standardization, "ISO 14457:2012, dentistry – handpieces and motors", International Organization for Standardization, ~ (2014)
- Cavalcanti BN, "Water flow in high-speed handpieces", Quintessence Int, 36, pp.361~364 (2005)
- Choi C, "Comparison of cutting efficiencies between electric and air-turbine dental handpieces", J Prosthet Dent, 103, pp.101~107 (2010)
- Kenyon BJ, "Comparison of cavity preparation quality using an electric motor handpiece and an air turbine dental handpiece", J Am Dent Assoc, 136, pp.1101~1105 (2005)
- Christensen GJ, "Are electric handpieces an improvement?", J Am Dent Assoc, 133, pp.1433~1434 (2002)
- Watson TF, "High and low torque handpieces : cutting dynamics, enamel cracking and tooth temperature", Br Dent J, 188, pp.680~686 (2000)
- Ercoli C, "In vitro comparison of the cutting efficiency and temperature production of ten different rotary cutting instruments. Part II: electric handpiece and comparison with turbine", J Prosthet Dent, 101, pp.319~331 (2009)
- Sarrett DC, "A laboratory evaluation of electric handpiece temperature and the associated risk of burns", ADA Prof Prod Rev, 9, pp.18~24 (2014)
- [URL]
- Lin M, "A review of heat transfer in human tooth--experimental characterization and mathematical modeling", Dent Mater, 26, pp.501~513 (2010)
- Green BG, "Heat pain thresholds in the oral-facial region", Percept Psychophys, 38, pp.110~114 (1985)
- Briseño B, "Rise in pulp temperature during finishing and polishing of resin composite restorations : an in vitro study", Quintessence Int, 26, pp.361~365 (1995)
- Murray PE, "Comparison of operative procedure variables on pulpal viability in an ex vivo model", Int Endod J, 41, pp.389~400 (2008)
- Raab WH, "Temperature related changes in pulpal microcirculation", Proc Finn Dent Soc, 88(Supplement 1), pp.469~479 (1992)
- Fouad A, "Cohen's pathways of the pulp", pp.2016, Mosby
- Vanderlei AD, "Ultrasonic versus high-speed cavity preparation : analysis of increases in pulpal temperature and time to complete preparation", J Prosthet Dent, 100, pp.107~109 (2008)
- Firoozmand L, "Temperature rise in cavities prepared by high and low torque handpieces and Er : YAG laser", Br Dent J, 12, pp.E1~ (2008)
- Baldissara P, "Clinical and histological evaluation of thermal injury thresholds in human teeth : a preliminary study", J Oral Rehabil, 24, pp.791~801 (1997)
- Cheung GS, "Fate of vital pulps beneath a metal-ceramic crown or a bridge retainer", Int Endod J, 38, pp.521~530 (2005)
- Valderhaug J, "Assessment of the periapical and clinical status of crowned teeth over 25 years", J Dent, 25, pp.97~105 (1997)