Summary The aim of this study was to determine the association between strength perioral muscles and masticatory performance. Subjects were 56 healthy adults (30 men 26 women; mean age 24·9 years) with normal occlusion. Perioral muscle pressure measured using JMS tongue measurement device, maximum cheek on habitual chewing side (H) non‐habitual (non‐H) measured. performance evaluated gummy jelly, amount glucose extracted after under condition H or non‐H. sex analysed Student's t ‐test. Cheek...

The aim of this study was to investigate the effect tongue rotation exercise training on oral functions using measurement maximum pressure (MTP) and labial closure strength (LCS) in normal adults. In experiment 1, differences MTP LCS at point for both groups with without were examined. We instructed subjects perform 2 months. measured before points 1 months after beginning training. 2, changes based sex 3 months, weeks results showed increased progress continuous always higher men than women...

The purpose of this study was to identify changes in sheet shape during thermoforming and the effect model position molding machine on fabricated mouthguard thickness.Ethylene vinyl acetate sheets (3.8 mm thick) were used that had cross-stripes (10 × 10 mm), anteroposterior bilateral lengths for measurements. Two forming machines used: a vacuum- pressure-forming machine, two heating conditions investigated defined as time when sagging softened 15 (H-15) 20 (H-20) below clamp, length each...

An undercut on the model's labial side affects mouthguard thickness. The aim of this study was to investigate how amount reduction rate laminated thickness.Mouthguards were thermoformed using 3.0-mm-thick ethylene-vinyl-acetate sheets for first and second laminates a pressure molding machine. Working models three hard plaster trimmed so that 0°, 10°, 20° (U0, U10, U20). A specialized caliper used measure thickness incisal, surface, buccal surface layer mouthguards. Thickness or due model...

Abstract Background/Aims Mouthguards can reduce the risk of sports‐related injuries but sheet material and thickness have a large effect on their efficacy safety. The aim this study was to investigate thermoforming technique that moves model position just before vacuum formation. Materials Methods Ethylene vinyl acetate sheets 4.0‐mm forming machine were used. working placed with its anterior rim positioned 40 mm from front table. Three conditions compared: (a) formed when it sagged 15 at...

Abstract Background/Aim The safety and effectiveness of mouthguards depend on the sheet material thickness. aim this study was to investigate fabrication method for a mouthguard with appropriate thickness using single regardless model angle. Materials methods Mouthguards were thermoformed 4.0 mm thick ethylene vinyl acetate sheets vacuum forming machine. working models three hard plaster trimmed so that angle anterior teeth base 90°, 100°, 110°. position 40 from front unit. softened until it...

Wearing a mouthguard reduces the risk of sports-related injuries, but material and thickness have substantial impact on its effectiveness safety. The aim this study was to establish thermoforming technique in which model position is moved just before formation suppress reduction thickness. assess effects height moving distance thickness.Ethylene-vinyl acetate sheets 4.0 mm thick vacuum forming machine were used. Three hard plaster models trimmed so that anterior teeth 25 mm, 30 35 mm. Model...

The aim of this study was to investigate differences in the thickness mouthguard sheet according holding conditions during heating. material used Sports Mouthguard (3.8 mm thickness), and two were undertaken: one condition that held all around periphery other at only four points. sheets formed using a vacuum former when heated until they hung 2.0 cm from baseline. We measured each part calculated ratio changes thickness. difference by area fitted over anterior teeth, palate, posterior teeth...

The purpose of this study was to determine changes in the thickness mouthguard sheets under different heating conditions during fabrication. Mouthguards were fabricated with polyolefin-polystyrene co-polymer (OS) and olefin (OL) (4.0-mm thick) utilizing a vacuum-forming machine following three conditions: (A) sheet moulded when it sagged 15 mm below frame (i.e. normally used position); (B) lowered heated at 30 top post by mm; (C) 50 mm. working model trimmed height 20 incisor first molar....

The strength of the intraoral and extraoral muscles that assist function tooth jaw movement during mastication is important for performing oral function. aim this study was to investigate usefulness gum chewing training improve swallowing feeding In experiment 1, differences in maximum tongue pressure (TP) cheek (CP) at measurement time point both groups with without were examined. We instructed subjects perform 3 times daily months. TP CP measured before 2, months after starting training....

The goal of the present study was to examine thickness mouthguards molded under a variety heating conditions clarify suitable during vacuum-pressure forming ethylene vinyl acetate sheets.Mouthguards were fabricated using (EVA) sheets (thickness: 4.0 mm) machine. sheet pressed against working model, followed by vacuum for 10 s and compression molding 2 min. Three investigated in which when center softened sagged mm, 15 or 20 mm below clamp (H-10, H-15, H-20 respectively). temperature surface...

The aim of this study was to clarify the effect on postural control function equalizing occlusal contact state by wearing a mouthguard. Method: Participants included 23 untrained adults, 11 gymnasts, and 10 weightlifters. Custom mouthguards were fabricated adjusted so that all teeth in even with light clenching. standing evaluated displacement center foot pressure (COP) measured using gravity fluctuation meter. Measurement conditions without Statistical analyses performed differences COP...

Erythema infectiosum is known to be caused by human parvovirus B19 and shows characteristic clinical skin manifestations in children, although adult cases of infection do not always show such features. Recently, we experienced an epidemic examined the erythematous lesion immunohistochemistry electron microscopy clarify pathogenesis manifestations. Light microscopic examination showed slightly irregular‐shaped vessels dermis. By immunohistochemistry, using anti‐human monoclonal antibody,...

Mouthguards can reduce the risk of sports-related injuries, but sheet material and thickness have a large effect on their efficacy safety. The aim this study was to investigate molded mouthguards when model position forming table changed stepwise in anteroposterior direction for different thicknesses materials.Ethylene vinyl acetate sheets olefin copolymer with 4.0 or 2.0 mm thick were used thermoforming by pressure-forming machine. working trimmed height 25 at maxillary central incisor 20...

The aim of this study was to investigate the influence thermal shrinkage thickness mouthguard with heating method by setting position a sheet and working model using an ethylene vinyl acetate prepared extrusion. Mouthguards were fabricated EVA sheets (4.0 mm thick) vacuum-forming machine. Two forming conditions compared: square pinched clamping frame attached machine (S); round at top bottom stabilized circle tray (R). aligned make sheet's extrusion direction vertical (V) or parallel (P)...

Abstract The aim of this study was to investigate the thickness mouthguard sheet after vacuum–pressure formation based on material. Three materials (4.0 mm thick) were compared: ethylene–vinyl acetate co‐polymer (EVA), olefin (OL), and polyolefin–polystyrene (OS). working model made by hard gypsum that trimmed height 20 at cutting edge maxillary central incisor 15 mesiobuccal cusp first molar. Where center softened sagged lower than clamp, pressed against model, followed vacuum forming for...

The aim of this study was to evaluate the change in thickness a working model mouthguard sheet due different shape. Mouthguards were fabricated with ethylene vinyl acetate (EVA) sheets (4.0 mm thick) using vacuum-forming machine. Two shapes compared: normal or v-shaped groove 10–40 from anterior end. Additionally, two compared; basal plane vertical tooth axis maxillary central incisor (condition A), and occlusal parallel B). Sheets heated until they sagged 15 below clamp. Postmolding...

Unevenness in softening of the plastic sheet leads to a decrease mouthguard thickness during thermoforming. In this study, we examined heating methods for reducing unevenness when sheets vacuum-pressure formation.Ethylene vinyl acetate and olefin copolymer (thickness: 4.0 mm) were used. The following three conditions compared: condition A-the was molded it sagged 15 mm from frame (under normal condition); B-the heater turned off by 10 frame, followed molding sagging reached below frame;...

The aim of this study was to examine the effect thermal shrinkage, which occurs during thermoforming ethylene vinyl acetate (EVA) sheets on thickness mouthguards fabricated by pressure formation.Mouthguards were from 4.0-mm-thick EVA utilizing a pressure-forming machine. Two molding conditions compared: placed in machine with sheet extrusion direction either vertical or parallel model's center line. working model trimmed height 20 mm at cutting edge maxillary central incisor and 15...

The aim of this study was to clarify the relationship between landing position during consecutive straight jumps and standing posture stability trampoline gymnasts with stable occlusal balance. Participants were 10 healthy men (BMI: 18.5–25.0) (competition experience: ≥12 years), all whom had To assess postural control function, displacements in forward–backward (COP-FB) left–right directions (COP-LR) center foot pressure recorded under eyes-open eyes-closed conditions. For gymnasts,...