Toshiaki Ueno

Toshiaki Ueno
Meikai University School of Dentistry · Department of Sports Dentistry

Professor

About

74
Publications
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566
Citations

Publications

Publications (74)
Article
Full-text available
Background/Objective: Conventional techniques for evaluating hydration status include the analysis of blood, urine, and body weight. Recently, advancements in dentistry have introduced capacitance sensor-based oral epithelial moisture meters as promising avenues for assessment. This study aimed to examine the correlation between oral mucosal moistu...
Article
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Background/Objectives: Porphyromonas gingivalis infection has been associated with various systemic diseases and may cause delayed healing of muscle injury. However, the relationship between muscle injury healing and P. gingivalis infection remains unclear. Our hypothesis was that P. gingivalis infection delays the healing of muscle injuries. Metho...
Article
Full-text available
Although sports mouthguards (MGs) are mandatory in some contact sports, the use of conventional fabricated materials for making MGs is time-consuming and lacks precision, limiting their widespread application. In this study, we compared mouthguards designed using digital software with conventional ones. The conventional mouthguards were categorized...
Article
Background/aim: Dental trauma may occur in school settings and it can impact patients' quality of life. Analysis of the occurrences of dental trauma is essential in identifying preventive methods. There are numerous reports of such accidents but most are quantitative analyses with limited data. The aim of this study was to extract information on t...
Article
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Background: A delay in muscle repair interferes with the effect of training or exercise; therefore, it is important to identify the factors that delay muscle repair. P. gingivalis, one of the most common periodontal disease pathogens, has the potential to inhibit muscle repair after training, as inferred from a previous study. To assess the expres...
Article
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Introduction Wind instrument players sometimes suffer from erosion of the mucous membrane of the lip. This is caused by the action and pressure of the mouthpiece of the wind instrument against teeth. To address this problem, a lip shield is fitted over the dental arch to prevent direct contact between the lips and teeth. However, there are a few st...
Preprint
Full-text available
This study evaluated the risk of oral injury in Kendo. We hypothesized that Kendo players in Japan may experience oral injury due to the use of face protector for kendo (men) with inaccurate measurements or wearing it incorrectly. The survey included 400 kendo players (male, 276; female, 174) and covered four areas: the relationship between the cha...
Article
Aim or Purpose Sports faceguards (FG) to protect the maxillofacial area get sweaty due to bad air permeability. To solve this problem, a combination of 3D-printed perforated acrylonitrile butadiene styrene (ABS) and knitted fabric with honeycomb structure (AKE) is considered as one option but it was unclear whether the combination have enough shock...
Article
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Background: The aim of this clinical study was to reveal the relationship between body dehydration and oral mucosa moisture measured by the use of a capacitance sensor for oral epithelial moisture. Methods: The following clinical parameters were recorded from each one of 19 athletes in a one-week period of high-intensity exercise at the U-23 Triath...
Article
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Background: Mouthguard (MG) disinfectant sprays are available for maintaining MG hygiene. The effect of these sprays against Streptococcus sobrinus is still unknown. The purpose of this study was to evaluate the antibacterial effect of an MG disinfectant spray against S. sobrinus using the modified ISO 22196 standard. Materials and Methods: In this...
Article
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Sports face guards (FGs) are devices that protect athletes from maxillofacial injury or ensure rapid return to play following orofacial damage. Conventional FGs are uncomfortable to wear owing to stuffiness caused by poor ventilation and often slip off due to increase in weight due to absorption of moisture from perspiration, lowering players’ perf...
Article
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The purpose of this study was to evaluate the application of fiberglass reinforcement method in thermoplastic mouthguard materials to improve flexural properties and adhesive strength. Commonly used two types of commercial mouth guard materials (ethylene-vinyl acetate copolymer-based and polyolefin-based) were reinforced with glass fiber clothes by...
Article
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Background/purpose Custom-made mouthguards (MGs) are strongly recommended for athletes during sports activities to prevent dental injuries. Athletes undergoing orthodontic treatment and wearing brackets require specially designed MGs for better protection and to create more space that will not hinder the planned orthodontic tooth movement. The purp...
Article
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Teeth clenching during exercise is important for sports performance and health. Recently, several mouth guard (MG)-type wearable devices for exercise were studied because they do not disrupt the exercise. In this study, we developed a wearable MG device with force sensors on both sides of the maxillary first molars to monitor teeth clenching. The f...
Article
Background/Aim Sports mouthguards are effective devices that prevent dental trauma in sports activities. Players should change mouthguards on a regular basis because of thickness reduction and shape deformation. However, there is no guidance regarding the best timing to change mouthguards. The aims of this study were to analyze the thickness change...
Article
Introduction Insufficient educational resources on sports dentistry results in varying lecture implementations across dental schools, which causes knowledge gaps amongst students. Thus, a new interactive sports dentistry‐related computer‐assisted learning (CAL) module was created to facilitate dental school undergraduate students' education. This s...
Article
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Sports mouthguards (MGs) can reduce the risks of sports-related oral injuries. The aim of this study was to fabricate a composite photopolymer with shock-absorbing properties suitable for use in 3D-printed MGs. By using a commercial, flexible, rubber-like photopolymer as matrix and a commercial rigid simulated polypropylene photopolymer as a reinfo...
Article
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Purpose: Wearing a sports mouthguard is not only recommended in collision sports, such as American football, boxing, and rugby football, but also in low-contact sports, such as basketball, handball, and soccer. It is recommended to remove oral prosthetic devices while playing sports to avoid the risk of fracturing the device. However, players with...
Article
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The aim of this study is to consider the hypothesis that wearing mouthguards (MGs) from a young age helps to shape players’ habit of continuing to wear MGs as adults. In addition, we consider the mandatory rule of wearing mouthguards in the youth category on the future wearing rates of mouthguards. Eighty-five Japanese male amateur rugby players we...
Article
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Laminated custom-made mouthguards tend to delaminate with use; this is a problem in clinical use. Insufficient bonding strength causes delamination, and bonding strength is strongly affected by heating temperature during lamination. The present study aimed to evaluate the influence of heating temperature on the sheet lamination process. Seven mouth...
Article
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The present study was conducted to investigate the influence of rehydration with diluted sports drink and water gargling on salivary flow, pH and buffering capacity during exercise. Nineteen participants performed a 30-min bicycle ergometer exercise at 80% of maximal heart rate while consuming a sports drink, followed by gargling with water, or no...
Article
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This study aimed to evaluate the shock absorption ability of trial face guards (FGs) incorporating a glass-fiber-reinforced thermoplastic (GF) and buffering space. The mechanical properties of 3.2 mm and 1.6 mm thick commercial medical splint materials (Aquaplast, AP) and experimental GF prepared from 1.6 mm thick AP and fiberglass cloth were deter...
Article
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The purpose of the present study was to develop an antibacterial mouthguard (MG) material using a masterbatch of silvernanoparticle-embedded ethylene-vinyl acetate (EVA) copolymers. In order to verify that the testing material was clinically applicable as an antibacterial MG material, we conducted an antibacterial test, a shock absorption test, and...
Article
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The purpose was to describe a novel simple experimental model of injured teeth for developing dental trauma splints (DTS), and to test various splints by combining use of this model and the Periotest® device. Rubber O-rings and spring washers were used to simulate and modify injured tooth mobility. Splinting effects were assessed among three kinds...
Article
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The present study evaluated the flexural properties of a new temporary splint material, G-Fix, for use in dental trauma splints in comparison with other resin materials. Four types of resin materials were considered in the present study: MI Flow II, light-cured composite resin (MI); G-Fix, light-cured resin for splinting teeth (GF); Super-Bond C&B,...
Article
The aim of this study was to analyze the effect of teeth clenching on dynamic balance at jump-landing. Twenty-five healthy subjects performed jump-landing tasks with or without teeth clenching. The first three trials were performed with no instruction; subsequently, subjects were ordered to clench at the time of landing in the following three trial...
Article
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The purposes of this study were to examine the shock absorption capability of addition-cured silicone denture relining materials and the bonding strength of addition-cured silicone denture relining materials and a commercial mouthguard material to determine its applicability to mouthguard adjustment. Two addition-cured silicone denture relining mat...
Article
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The purposes of this study were to examine the shock absorption capability of addition-cured silicone denture relining materials and the bonding strength of addition-cured silicone denture relining materials and a commercial mouthguard material to determine its applicability to mouthguard adjustment. Two addition-cured silicone denture relining mat...
Article
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Purpose: We assessed whether the soleus H reflex was depressed or facilitated in association with voluntary teeth clenching during muscle fatigue. Methods: A total of 13 and 9 healthy adult subjects were instructed to perform right-side tiptoe standing for 5 (TS1) and 10min (TS2) to induce the soleus muscle fatigue. Electromyograms (EMGs) were r...
Article
Purpose: The purpose of this study was to investigate the shock absorption capability of commercial thermoforming mouthguard sheet materials. Materials and methods: Twelve commercial thermoforming mouthguard sheet materials were selected as test materials. The impact test was applied by a free-falling steel ball. When impact forces of approximat...
Article
Full-text available
We examined the effect of hyperbaric oxygen (HBO2) treatment on bone wound healing in a rat calvarial defect. Critical-sized defects were created in the calvaria of adult Wistar rats. The animals were divided into four groups - HBO2, normobaric oxygen, hyperbaric air, and no treatment. Treatments were performed five days a week, for two weeks. Micr...
Conference Paper
Aim: The aim of this study was to investigate about the incidence of oral injuries and mouthguard usage and its awareness among Nepalese martial arts athletes. Materials and Methods: Total study population was 143 martial arts athletes, consisted of 103 taekwondo (80 males and 23 females) and 40 Shotokan karate (31 males and 9 females) players. Da...
Article
AimCustom-made mouthguard (MG) is popularly used by sports-active persons or athletes having either normo-occlussion or malocclusion to prevent dental injury. For sports-active person with malocclusion, specially designed mouthguard is often required. The purpose of this study was to make a suitable design custom-made mouthguard for sports-active p...
Conference Paper
Objective: Hyperbaric oxygen treatment (HBO) is used for decompression sickness, gas poisoning, fracture of the limbs, and so on. However, HBO is unpopular yet in orofacial fields. Therefore, we examined the facilitatory effect to bone wound healing by HBO in a rat calvarial defect model. Method: Thirty-two adult Wistar rats were divided into HBO...
Article
Full-text available
The aims of the present study were to investigate the shock absorption capability and force dispersion effect of mouthguard (MG) materials using load cell and film sensors. Two kinds of MG materials, ethylene vinyl acetate and polyolefin, were chosen for this study. When impact forces of approximately 5,000 N were applied on the MG materials using...
Article
Full-text available
The aim of this study was to investigate the influences of rehydration and food consumption on salivary flow, pH, and buffering capacity during bicycle ergometer exercise in participants. Ten healthy volunteers exercised on a bicycle ergometer at 80% of their maximal heart rate. These sessions lasted for two periods of 20 min separated by 5-min res...
Article
Several methods have been used to measure the impact force absorption capacities of mouthguard materials; however, the relationships among these measurement systems have not been clearly determined. The purpose of the present study was to evaluate the impact force-absorbing capability of materials using a drop-ball system with film sensors and load...
Conference Paper
Objective: A previous fundamental study revealed that an autopolymerization addition silicone resilient denture relining material (SI) had excellent shock absorption properties similar to those of thermoplastic materials commonly used for mouthguards (ethylene-vinyl acetate co-polymer; EVA). The aim of the present study was to examine the bonding s...
Article
Aim: Experimental materials incorporating fiberglass cloth were used to develop a thin and lightweight face guard (FG). This study aims to evaluate the effect of fiberglass reinforcement on the flexural and shock absorption properties compared with conventional thermoplastic materials. Material and method: Four commercial 3.2-mm and 1.6-mm medic...
Article
Brain activity associated with manual stereognosis has been the focus of increasing recent research effort. However, although oral stereognosis, defined as the ability to recognize and discriminate the food bolus in the mouth, is important for mastication and swallowing, there is little information available about the neural network relating to thi...
Article
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High positive acceleration (+Gz) stress is known to cause cerebral hypoperfusion, resulting in brain insults. Muscular contraction is reported to induce a pressor response. The effects of teeth clenching on cerebral hypoperfusion were examined. The masseter muscle of anesthetized Sprague-Dawley rats was electrically stimulated to cause maximum clen...
Article
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目的:我々は熱変形の比較的ないシリコーンゴムやアクリル樹脂等の歯科で使われている材料のマウスガード(MG)用材料としての応用に着目しており,鉄球自由落下衝撃試験を行い,市販MG 材料との性能比較を行ったので報告する.方法:試験材料は市販MG 用材料2 種MG,MG2,シリコーンゴム材料2種SL1,SL2,及びアクリル 樹脂材料2種RE1,RE2の計6種である.直径15 mmの鉄球(13.8 gf)を600 mm上方から自由落下させて加撃し,最大荷重(P1)ならびに加撃開始から最大荷重までの時間(P1-t)を算出し,分散分析およびScheffe の多重比較を行った.結果:6試料のP1間には統計学的有意差が認められ,RE1 ≈ RE2 > SL1 > MG1 ≈ MG2 > SL2であった. 同...
Article
Studies on the relationship between dental occlusion and body balance have suggested that occlusion status contributes to the maintenance of postural balance. However, little has been reported about the effects of voluntary teeth clenching on the stabilization of postural stance in novel environments. In the present study we investigated whether te...
Article
Full-text available
The purpose of this study was to assess the behavior of laminated thermoforming materials in an underwater environment to understand the durability of mouthpieces for scuba diving. Two thermoforming materials, polyolefin (PO) and ethylene-vinyl acetate copolymer (EV), were laminated and stored in air, 37 degrees C water, and 37 degrees C water unde...
Article
It has been speculated that the use of a mouthguard improves athletic ability such as muscular strength and equilibrium. The postural system is equipped with response patterns that correct for unexpected perturbations. These responses are driven by immediate feedback from visual, vestibular, and somatosensory information. These are integrated by th...
Article
Scuba divers may suffer from temporomandibular joint dysfunction and related problems associated with the use of commercially available diving mouthpieces. Several authors have recommended that custom diving mouthpieces be fabricated for relieving the symptoms of diver's mouth syndrome. The lost wax technique is commonly used for this purpose but m...
Article
We investigated whether there is any modulation of the H reflex in the forearm during teeth clenching and how any correlation that may be found is modulated. The H reflexes of the flexor carpi radialis (FCR) and the extensor carpi radialis (ECR) muscles were evoked on the right side in five healthy adult volunteers. The H reflexes of the FCR and EC...
Article
Full-text available
Using a modal analysis system, we carried out a comparative assessment of the vibratory properties of the maxillary dentition of a human dry skull with a different distal end of a mouthguard. Mouthguards used in this study were: 1. a mouthguard covering up to the third molar (8MG), 2. the second molar (7MG), 3. the first molar (6MG), and 4. the sec...
Article
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目的: 本研究の目的は, 咬合機能と握力発揮特性の関連性を検証することである.方法: 被験者は, 安定した咬頭嵌合位を有する健常成人男性12名 (23.7±2.2歳: 平均値±標準偏差) を対象とした.変色視覚刺激を合図に, 咬頭嵌合位での最大噛みしめ (MVCT), あるいは下顎安静位 (RP) の条件下で, 2秒間の右側瞬発握力発揮を各2回, 計4回行わせた.試技順序は任意とし, 各試技間には3分間の休息を設けた. 握力発現開始からの1秒間を解析対象とし, 最大握力 (maxF), 0.1秒ごとの区間平均握力 (aveF), 0.001秒ごとの微分握力最大値 (maxRFD) および90%最大握力発現時間 (T90%max) を算出し, 各条件間で比較検討した. 統計学的検定にはpair...
Article
The aim of the study was to characterize the acoustics of vowel articulation in maxillectomy patients. Digital acoustic analysis of five vowels, /a/, /e/, /i/, /o/ and /u/, was performed on 12 male maxillectomy patients and 12 normal male individuals. A simple set of acoustic descriptions called the first and second formant frequencies, F1 and F2,...
Article
A previous study in our laboratory demonstrated that the soleus H reflex was facilitated during mastication in humans. In the present study, we investigated whether there was any modulation of the magnitude of the pretibial H reflex during mastication in five healthy adult volunteers. The pretibial H reflex was significantly facilitated during mast...
Article
Full-text available
Previous research has demonstrated that the concentric muscle strength of knee extension exerted at slow to medium angular velocities is increased by teeth clenching. This study evaluated the isokinetic eccentric strength of knee extensors at 4 angular velocities (60, 120, 180 and 240 degrees per second) with and without teeth clenching on the Cybe...
Article
Full-text available
The purpose of this study was to investigate the effect of teeth clenching on isokinetic knee extension force during repeated voluntary contractions. We assessed isokinetic muscle strength in association with teeth clenching during 100 consecutive knee extensions at 60 degrees per second (deg/s) using a Cybex 6000 isokinetic dynamometer. In this st...
Article
Full-text available
To investigate the effect of teeth clenching on isokinetic knee extension at various velocities, isokinetic muscle strength during knee extension was measured in association with teeth clenching at 30, 60, 150, 300 and 450 degrees per second (deg/s) using the Cybex 6000 isokinetic dynamometer. The volunteer subjects were 9 healthy males (26.2± 0.97...
Article
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In edentulous patients with maxillary defects, it is difficult to obtain sufficient retention, support, and stability of the obturator prosthesis, in addition, its mobility during various functions is considered to be large. A thorough understanding of the mobility of the obturator prosthesis is important to achieve successful results in the patien...
Article
Full-text available
To investigate the effect of voluntary teeth clenching on the isometric and isokinetic exercises of the lower limbs, the association of muscle strength (peak torque, PT) and muscle activities (integrated electromyographic activity per unit of time, iEMG/s) of the three muscles of the triceps surae with teeth clenching during isometric and isokineti...
Article
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Many studies have been performed on the mandibular orthopedic repositioning appliance (MORA) as an athletic performance enhancer since the late 1970s. The concept that changing the mandibular position would increase the strength and improve the performance of subjects has been a source of controversy among various researchers. The strength of shoul...
Article
To investigate the relationship between teeth clenching in intercuspal position and isometric shoulder adduction movement in 12 normal subjects, the muscle strength and electromyogram (EMG) of the seven muscles concerned were measured by using Cybex 6000 Extremity Testing and Rehabilitation System and surface EMG analyzing system. Normalized peak t...

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