The study investigated the cooling efficiency of different numbers of water coolant ports on high-speed handpieces (HSH) under cooling conditions used in clinical practice.Twenty-four groove cuts with water on and nine cuts without water were made on extracted human premolars using three HSHs with different port configurations. Thermocouples were placed in the pulp chambers and temperature changes were recorded with 1-, 3- and 4-coolant port handpieces. Cooling rate was calculated for each coolant port design system. Temperature changes were statistically analysed with Kruskal-Willis Test.All three sample groups resulted in a net temperature decrease during the cutting period with water turned on. There was a pattern of increased cooling rate with increasing number of coolant ports (1-port: -4.27 (±0.94) °C, 3-port: -4.66 (±2.90) °C, 4-port: -5.03 (±1.08) °C). The difference was not statistically significant (p = 0.681). Calculations of cooling rate showed a higher cooling rate with an increase in the number of ports (1-port: 46.13 × 10−4 K−1, 3-port: 51.36 × 10−4 K−1, 4-port: 56.32 × 10−4 K−1). In the dry tooth preparation samples, all resulted in a net increase in temperature (1-port: 4.43 (±3.30) °C, 3-port: 5.13 (±3.27) °C, 4-port: 2.87 (±2.97) °C).All the three water coolant port configurations showed effective cooling of the tooth during cutting and decreased pulpal temperature with no statistical difference. There are HSH designs with varying numbers of coolant ports available in the market for clinicians. The results of the current study could potentially aid clinicians in making a decision while choosing between different dental handpieces.
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机译:这项研究调查了在临床实践中使用的冷却条件下,高速手机(HSH)上不同数量的水冷却剂端口的冷却效率。使用3个提取的人类前磨牙对24个有水的凹槽切口和9个无水的切口进行切割具有不同端口配置的HSH。将热电偶放置在果肉室中,并用1、3和4冷却液口手机记录温度变化。计算每个冷却液端口设计系统的冷却速率。使用Kruskal-Willis检验对温度变化进行统计分析。所有三个样品组均在开水的情况下导致切割期间的净温度下降。冷却速度随着冷却液端口数量的增加而增加(1端口:-4.27(±0.94)°C,3端口:-4.66(±2.90)°C,4端口:-5.03(±1.08) )°C)。差异无统计学意义(p = 0.681)。冷却速率的计算表明,随着端口数量的增加,冷却速率越高(1端口:46.13×10 −4 sup> K -1 sup>; 3端口:51.36 ×10 −4 sup> K −1 sup>,4端口:56.32×10 −4 sup> K -1 sup>)。在干牙准备样品中,所有结果均导致温度净升高(1端口:4.43(±3.30)°C,3端口:5.13(±3.27)°C,4端口:2.87(±2.97)° C)。所有三种水冷却剂端口配置在切割过程中均显示出有效的牙齿冷却效果,降低了牙髓温度,无统计学差异。市场上为临床医生提供了具有不同数量冷却剂端口的HSH设计。当前研究的结果可能有助于临床医生在不同牙科手机之间进行选择时做出决定。
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