Determination of vibration acceleration mechanism and vibration load application duration from a non-biological perspective: Orthodontic Acceleration

Abstract

Compared to other orthodontic acceleration methods such as drug, electric current, and laser, vibratory loading is less invasive and easier to use. But the optimal duration for vibratory load application has not been determined, nor can the alveolar bone parameters be predicted after vibratory load application. Therefore, this work examined the mechanism of vibration-accelerated alveolar bone reconstruction and established a numerical model for simulating alveolar bone damage caused by vibration loads. That is, the role of vibration load in orthodontic acceleration was analyzed, and a finite element model was established to validate the vibra-tion-accelerated orthodontic mechanism with a simulated numerical model of alveolar bone damage. The optimal duration of application was obtained for the right anterior incisor under vibratory loading of 5 N orthodontic force, 50 Hz in the gingival orientation and 0.2 cm amplitude for 120 to 140 minutes. This work is of guidance and reference significance in promoting the development of orthodontic treatment and shortening the orthodontic treatment cycle.

Digital Interactive Design and Robot-Assisted Preparation Experiment of Tooth Veneer Preparation: An in Vitro Proof-of-Concept

“…Accuracy analysis of veneer preparation based on the team's previous method of post-preparation analysis of full crowns [24,25]. The selection of the feature points of veneer preparation is shown in Fig.…”

“…The curve is output to get the discrete point Q. By using the method proposed in [24], the control point information i P is inversed through the ideal trajectory planning curve, determines discrete points, node vectors, control points, and weight factors. The approximate original finishing lines preparation curve is obtained by B-spline curve fitting, and the fitting curve is shown in Fig.…”

“…The planned trajectory points and tooth model are matrixtransformed to make the gum side close to the x-o-y plane, facilitate the stable placement of gypsum teeth, and ensure the processing space. The pose relationship between the tooth and the robot is established by the method proposed in [24,25], and the pose relationship between them is calibrated. The coordinate centers of the robot positioning area and the tooth positioning (acrylic plate) area are determined.…”

“…The laser working head controls the movement of the laser to complete the tooth preparation. Our team [24,25] proposed an augmented reality-based robot to assist in the complete crown preparation of posterior teeth. NURBS curves and NURBS surfaces were used for inverse calculation and interpolation to achieve trajectory planning for robot-assisted preparation.…”