Increased Handpiece Speeds without Air Coolant: Aerosols and Thermal Impact.
Increased Handpiece Speeds without Air Coolant: Aerosols and Thermal Impact.
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DOI：
10.1177/00220345221123253
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发表时间：
2023-01
影响因子：
7.6
通讯作者：
中科院分区：
文献类型：
--
作者：
这项研究评估了高速对角手机(HSCAHs)速度的提高对严重急性呼吸综合征冠状病毒2型(SARS-CoV-2)替代病毒的雾化以及对牙髓的任何伴随的热冲击的影响。生物气溶胶的检测采用噬菌体幻影头模型。使用NSK Z95L Contra-Angel 1：5(HSCAH-A)和Bien Air Contra-Angel 1：5 Nova Micro Series(HSCAH-B)以每分钟60,000、100,000和200,000转(Rpm)的速度进行牙冠准备，不使用空气冷却剂。用Φ6-噬菌体沉降板、空气采样和颗粒计数器测量生物气溶胶的分散度。在牙冠制备过程中，使用HSCAH-A和HSCAH-B的红外相机在200,000 rpm(水流≈15 mLmin−1和≈30 mLmin−1)和空气涡轮控制(≈23.5mLmin−1)下评估髓室内壁的加热，并与剩余组织厚度测量相关联。在沉淀物或空气样本上检测到最低限度的噬菌体，手机和速度之间没有明显差异(P>；0.05)。在所有速度下，最大悬浮气溶胶和平均空气检测分别为1.00空斑形成单位(PFU)和0.08PFU/立方米。无论水流速度或听筒，牙髓健康的最高温度(41.5°C)和温差(5.5°C)阈值都随着组织厚度的减少而更频繁地超过。根据皮尔逊相关系数，剩余牙本质厚度与差值(r=−0.588)或最高温度(r=−0.629)分别呈中度和高度负相关。总体而言，与HSCAH-A相比，HSCAH-B产生了更多的热能，超过了更多的温度阈值。没有空气冷却剂的HSCAHs以每分钟200,000转的速度运行，不会增加牙科手术中的生物气雾化。热风险是可变的，取决于手机的设计和剩余的牙本质厚度。
This study assessed the impact of increased speed of high-speed contra-angle handpieces (HSCAHs) on the aerosolization of a severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) surrogate virus and any concomitant thermal impact on dental pulp. A bacteriophage phantom-head model was used for bioaerosol detection. Crown preparations were performed with an NSK Z95L Contra-Angle 1:5 (HSCAH-A) and a Bien Air Contra-Angle 1:5 Nova Micro Series (HSCAH-B) at speeds of 60,000, 100,000, and 200,000 revolutions per minute (rpm), with no air coolant. Bioaerosol dispersal was measured with Φ6-bacteriophage settle plates, air sampling, and particle counters. Heating of the internal walls of the pulp chambers during crown preparation was assessed with an infrared camera with HSCAH-A and HSCAH-B at 200,000 rpm (water flows ≈15 mL min−1 and ≈30 mL min−1) and an air-turbine control (≈23.5 mL min−1) and correlated with remaining tissue thickness measurements. Minimal bacteriophage was detected on settle or air samples with no notable differences observed between handpieces or speeds (P > 0.05). At all speeds, maximum settled aerosol and average air detection was 1.00 plaque-forming units (pfu) and 0.08 pfu/m3, respectively. Irrespective of water flow rate or handpiece, both maximum temperature (41.5°C) and temperature difference (5.5°C) thresholds for pulpal health were exceeded more frequently with reduced tissue thickness. Moderate and strong negative correlations were observed based on Pearson’s correlation coefficient, between remaining dentine thickness and either differential (r = −0.588) or maximum temperature (r = −0.629) measurements, respectively. Overall, HSCAH-B generated more thermal energy and exceeded more temperature thresholds compared to HSCAH-A. HSCAHs without air coolant operating at speeds of 200,000 rpm did not increase bioaerosolization in the dental surgery. Thermal risk is variable, dependent on handpiece design and remaining dentine thickness.
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影响因子：
4.2
作者：
PETERS, DD;BAUMGARTNER, JC;LORTON, L
通讯作者：
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影响因子：
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影响因子：
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通讯作者：
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影响因子：
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影响因子：
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作者：
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Clerehugh V