Objective: To observe the crystal character of the attached end and free end of dentalcalculus.
目的：观察牙结石附着面和游离面晶体构型的差异。
2
Objective to simulate the formation of dentalcalculus by studying the resolution and re-deposition of dentalcalculus in vitro and to explore the mechanism of dentalcalculus formation.
目的通过牙结石的体外溶解及再沉积模拟牙结石的形成过程，以探讨牙结石的形成机制。
3
This air scaler is intended to remove dental plaque, calculus and stain from tooth surface and tooth root by dental professionals only.