Angle Orthod. 2021 Jul 1;91(4):528-537. doi: 10.2319/052620-480.1.
To explore whether the commercial agents recommended for controlling dental biofilm formation had a significant effect in vivo on mechanical and corrosion properties of nickel-titanium (NiTi) alloy.
NiTi archwires (dimensions 0.508 × 0.508 mm) were collected from 36 orthodontic patients aged 13-42 years after a 3-month intraoral exposure. Three experimental groups were formed: (1) subjects conducting regular oral hygiene, (2) subjects who used fluorides for intensive prophylaxis for the first month, and (3) subjects who used chlorhexidine in the same manner. Corrosion behavior, surface characteristics, stiffness, hardness, and friction were analyzed.
Exposure to intraoral conditions significantly reduced the stiffness and hardness of the NiTi alloy (P ≤ .015). Fluoride tended to reduce stiffness and hardness more than did saliva or antiseptic, but not significantly. Roughness and friction were not significantly influenced by oral exposure. Intraoral aging predominantly produced general corrosion independent of the adjuvant prophylactic agent, although localized corrosion may also have occurred.
Fluorides and the antiseptic chlorhexidine do not increase corrosion more than saliva itself, nor do they further modify the mechanical properties of the NiTi alloy.
探讨用于控制牙生物膜形成的商业代理在体内对镍钛（NiTi）合金的机械和腐蚀性能是否有显著影响。
从 36 名年龄在 13-42 岁的正畸患者的口腔内暴露 3 个月后收集镍钛弓丝（尺寸为 0.508×0.508mm）。将其分为三组实验：（1）定期进行口腔卫生的受试者；（2）第一个月使用氟化物进行强化预防的受试者；（3）以同样方式使用洗必泰的受试者。对腐蚀行为、表面特性、刚度、硬度和摩擦进行了分析。
暴露于口腔环境会显著降低 NiTi 合金的刚度和硬度（P≤0.015）。与唾液或防腐剂相比，氟化物更倾向于降低刚度和硬度，但差异无统计学意义。粗糙度和摩擦不受口腔暴露的显著影响。口腔内老化主要产生独立于辅助预防性药物的一般性腐蚀，尽管可能也发生了局部腐蚀。
氟化物和防腐剂洗必泰不会比唾液本身更增加腐蚀，也不会进一步改变 NiTi 合金的机械性能。
