Objective

This in vivo study evaluated pulp temperature (PT) rise in human premolars having deep Class V preparations during exposure to a light curing unit (LCU) using selected exposure modes (EMs).

Methods

After local Ethics Committee approval, intact first premolars (n = 8) requiring extraction for orthodontic reasons, from 8 volunteers, received infiltrative and intraligamental anesthesia and were isolated using rubber dam. A minute pulp exposure was attained and sterile probe from a wireless, NIST-traceable, temperature acquisition system was inserted into the coronal pulp chamber to continuously monitor PT (°C). A deep buccal Class V preparation was prepared using a high speed diamond bur under air-water spray cooling. The surface was exposed to a Polywave^® LED LCU (Bluephase 20i, Ivoclar Vivadent) using selected EMs, allowing 7-min span between each exposure: 10-s in low (10-s/L), 10-s (10-s/H), 30-s (30-s/H), or 60-s (60-s/H) in high mode; and 5-s-Turbo (5-s/T). Peak PT values and PT increases over physiologic baseline levels (ΔT) were subjected to 1-way, repeated measures ANOVAs, and Bonferroni’s post-hoc tests (α = 0.05). Linear regression analysis was performed to establish the relationship between applied radiant exposure and ΔT.

Results

All EMs produced higher peak PT than the baseline temperature (p < 0.001). Only 60-s/H mode generated an average ΔT of 5.5 °C (p < 0.001). A significant, positive relationship was noted between applied radiant exposure and ΔT (r² = 0.8962; p < 0.001).

Significance

In vivo exposure of deep Class V preparation to Polywave^® LED LCU increases PT to values considered safe for the pulp, for most EMs. Only the longest evaluated EM caused higher PT increase than the critical ΔT, thought to be associated with pulpal necrosis.

中文翻译：

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V类制剂对影响体内曝光期间在麻醉的人牙髓的温度上升到一个Polywave ^® LED光固化机

客观的

这项体内研究评估了使用选定的曝光模式（EMs）暴露于光固化单元（LCU）期间具有深V级制剂的人前磨牙的牙髓温度（PT）升高。

方法

经当地伦理委员会批准后，出于正畸原因需要拔除的完整第一前磨牙（n = 8）来自8位志愿者，接受了浸润和韧带内麻醉，并使用橡皮坝进行了隔离。达到微小的牙髓暴露，将来自无线，可追溯至NIST的温度采集系统的无菌探针插入冠状牙髓腔中，以连续监测PT（°C）。在空气-水喷雾冷却条件下，使用高速金刚石钻针制备了深颊颊V类制剂。表面暴露于Polywave ^®使用选定的EM的LED LCU（Bluephase 20i，Ivoclar Vivadent），每次曝光之间的间隔为7分钟：低（10-s / L），10-s（10-s / H），30-s（10-s / L） 30-s / H）或高模式下60-s（60-s / H）；和5-s-Turbo（5-s / T）。对PT峰值和PT超过生理基线水平（ΔT）进行1次，重复测量方差分析和Bonferroni事后检验（α  = 0.05）。进行线性回归分析以建立施加的辐射暴露与ΔT之间的关系。

结果

所有EM产生的PT峰值均高于基线温度（p  <0.001）。只有60 s / H模式产生的平均ΔT为5.5°C（p  <0.001）。 观察到所施加的辐射暴露与ΔT之间存在显着的正相关关系（r ² = 0.8962； p <0.001）。

意义

体内深V类制剂暴露于Polywave ^® LED LCU增加PT所考虑用于纸浆安全值，对于大多数新兴。仅评估时间最长的EM导致PT升高高于临界ΔT，这被认为与牙髓坏死有关。