Uzel Aslihan, Buyukyilmaz Tamer, Kayalioglu Mustafa, Uzel Ilter
Department of Orthodontics, Faculty of Dentistry, University of Cukurova, Adana, Turkey.
Angle Orthod. 2006 Mar;76(2):330-4. doi: 10.1043/0003-3219(2006)076[0330:TRDOBW]2.0.CO;2.
The purpose of this in vitro study was to investigate the temperature changes in the pulp chamber during bracket bonding using three different light sources. Bracket bonding was performed on one lower first premolar and one lower central incisor at two different distances (surface and 10 mm). The measurements were taken with a J-type thermocouple wire, placed in the pulp chamber and connected to a data logger. Analysis of variance revealed that pulp chamber temperature changes were influenced by the light source, the tooth type, and the distance from the tip of the light guide to the bracket surface. Halogen induced significantly higher intrapulpal temperature changes than light-emitting diode and Xenon Plasma Arc (PAC) (P = .000). The temperature increase was significantly higher when the light-guide tip was positioned at the surface of the teeth than at the 10-mm distance with all light-curing units (P = .000). All light-curing units produced higher intrapulpal temperature increase in the mandibular incisor than in the premolar. Power PAC produced significantly higher heat changes in the incisor than in the premolar. Orthodontic bonding with different light-curing units did not exceed the critical 5.5 degrees C value for pulpal health.
本体外研究的目的是调查使用三种不同光源进行托槽粘结时髓腔内的温度变化。在一颗下颌第一前磨牙和一颗下颌中切牙上，于两个不同距离（表面和10毫米）进行托槽粘结。测量使用J型热电偶丝，放置在髓腔内并连接到数据记录器。方差分析显示，髓腔温度变化受光源、牙齿类型以及光导尖端到托槽表面距离的影响。卤素光源引起的牙髓内温度变化显著高于发光二极管和氙等离子弧（PAC）光源（P = 0.000）。在所有光固化装置中，当光导尖端位于牙齿表面时，温度升高显著高于距离为10毫米时（P = 0.000）。所有光固化装置在下颌切牙中产生的牙髓内温度升高均高于前磨牙。动力PAC光源在切牙中产生的热变化显著高于前磨牙。使用不同光固化装置进行正畸粘结时，牙髓健康的临界温度5.5摄氏度并未被超过。
