Trueness of One Stationary and Two Mobile Systems for Three-Dimensional Facial Scanning.

Purpose: To evaluate the trueness of one stationary and two mobile systems for 3D facial scanning.

Materials And Methods: Twenty participants were included in this study. After marking facial soft tissue landmarks, their faces were scanned using three facial scanning systems: the Bellus3D Dental Pro app on an iPad Pro 2020 (Apple; IP); the ARC-7 Face Scanning System (Bellus3D; BA); and the EinScan Pro 2X Plus (Shining 3D Tech; EP) following the manufacturers' operating instructions.

[Influence of canine vertical position on smile esthetic perceptions by using 3D digital facial reconstruction].

Purpose: To verify the impact of alterations in the vertical position of maxillary canine on smile esthetic perceptions, in order to find an optimal canine position.

Methods: A volunteer's dentition and facial images were scanned by intra-oral scanning and three-dimensional facial scanning, which were then calibrated. In virtue of dental computer-aided design software, the canine vertical positions were symmetrically modified in a variable of 0.

[Minimal invasive microscopic tooth preparation based on endodontic, periodontal and functional health].

Tooth preparation is the primary and core operation technique for dental esthetic restoration treatment, due to its effect of providing restoration space, bonding interfaces and marginal lines for dental rehabilitation after tooth tissue reduction. The concept of microscopic minimal invasive dentistry put forward the issue of conducting high-quality tooth preparation, conserve tooth-structure, protect vital pulp and periodontal tissue simultaneously. This study reviewed the concepts, physiology background, design and minimal invasive microscopic tooth preparation, and in the meantime, individualized strategies and the two core elements of tooth preparation (quantity and shape) are listed.

3D-printed custom trays with a Gothic arch for centric relation recording and definitive impression making for complete dentures: A dental technique.

An appliance was designed and fabricated by using computer-aided design and computer-aided manufacturing (CAD-CAM) and 3-dimensional (3D) printing to combine a custom tray with an intraoral Gothic arch. This helped simplify centric relation recording and combined definitive impression making and centric relation recording into a single step.

Effects of repetitive transcranial magnetic stimulation on masseter motor-neuron pool excitability.

Objective: Repetitive transcranial magnetic stimulation (rTMS) has been widely used to modulate the excitability of the cortical control of limbs muscles, but rarely in the cortical control of human masseter muscles. This study aims to investigate the effects of rTMS on masseter motor-neuron pool excitability in humans.

Materials And Methods: A total of 20 healthy participants were selected and received a total of three rTMS sessions involving stimulation of the right masseter-motor complex: one session of 10-Hz rTMS, one session of 1-Hz rTMS and one session of sham rTMS at an intensity of 80% of the active motor threshold (AMT).

BM-MSCs and Bio-Oss complexes enhanced new bone formation during maxillary sinus floor augmentation by promoting differentiation of BM-MSCs.

Bone marrow-derived mesenchymal stem cells (BM-MSCs) have been recognized as a new strategy for maxillary sinus floor elevation. However, little is known concerning the effect of the biomechanical pressure (i.e.

Excitability of the central masticatory pathways in patients with sleep bruxism.

Since sleep bruxism (SB) is defined as a stereotyped movement and mainly associated with rhythmic masticatory muscle activity, the aim of this study was to get a better understanding on the subcortical and cortical networks related to the excitability of the central masticatory pathways in SB patients. Of 26 SB patients (12 females and 14 males; mean age: 24.9±4.

[The masseter inhibitory reflex and the recovery of the reflex after magnetic stimulation in normal subjects].

Objective: To analyze the masseter inhibitory reflex (MIR) and the recovery cycle of the MIR reflex after magnetic stimulation in normal subjects.

Methods: In 30 healthy subjects we studied the MIR evoked by single magnetic stimulation in the mental territory. Masseter electromyographic activity, latency and duration of the early silent periods (SP1) and late silent periods (SP2), and SP2 amplitude percent were recorded.

[Effect of self-made colloid paste on gingival retraction in dogs].

Purpose: To evaluate the efficiency of self-made paste on gingival retraction in dogs as well as its potential clinical application.

Methods: Forty teeth from two mature dogs were prepared with 0.5 mm wide shoulder in the lip and buccal sides of the teeth, and then divided into four groups randomly.

[The influence of thickness ratios on the fatigue behaviors of two kinds of dental ceramic].

Objective: To investigate the intensity changes of different thickness ratios of Empress II glass ceramic and GI- II glass-infiltrated alumina ceramic before and after Hertzian contact cyclic fatigue.

Methods: Disk-shaped specimens of different thickness ratios of Empress II glass ceramic and GI-II glass-infiltrated alumina ceramic were respectively fabricated. Hertzian contact technique was imposed on the specimens.

[Research of morphology for the toothmark in pocket limb].

Objective: The purpose of this study was to observe the morphological changes of toothmarks in pocket limbs and to explore the durative development of bitemarks.

Methods: Firstly a toothmark model was established by using a universal testing machine and a self-made incisor nod which was pressed particularly on pocket limbs. The changes of toothmarks were observed on alive and dead animals with time elapsing.

[Compared study of cyclic fatigue behaviors in two kinds of dental ceramic layers structures].

Objective: To compare the difference in strength degradation and morphology damage of two dental ceramic materials after Hertzian contact cyclic fatigue.

Methods: Hertzian contact technique was used to investigate the response of Empress II glass ceramic and GI- II glass-infiltrated alumina ceramic to cyclic fatigue. Critical loads of specimens after different fatigue cycles were recorded.

[Cyclic fatigue of Vita mark II machinable ceramics under Hertzian's contact].

Objective: To investigate the cyclic fatigue modes of Vita mark II machinable ceramics under Hertzian's contact.

Methods: Hertzian's contact technique (WC spheres r = 3.18 mm) was used to investigate the cyclic fatigue of Vita mark II machinable ceramic.

[A comparative study on cyclic and static fatigue of dental ceramic by means of Hertzian's contact].

Objective: To compare the difference in strength degradation and morphology damage of brittle dental ceramic after static load and cyclic fatigue.

Methods: Hertzian's contact technique with a tungsten carbide sphere was used to investigate the response of feldspathic dental porcelain to static load and cyclic fatigue. All specimens were subjected to static or cyclic loading in moist environment.

[Cyclic fatigue of GI-II glass infiltrated ceramic in Hertzian's contact].

Purpose: To investigate the cyclic fatigue damage modes of GI-II glass infiltrated ceramic in Hertzian's contact.

Methods: All ceramic specimens were loaded by a r=3.18 mm WC ball to investigate their cyclic fatigue behavior in Hertzian's contact.