start-ver=1.4 cd-journal=joma no-vol=2026 cd-vols= no-issue=1 article-no= start-page=7874254 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2026 dt-pub=202601 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Experimental Analysis of Automatic Discrimination Performance Between Simulated Bruxism and Non‐Bruxism Under Conscious Conditions Using Electromyography and Machine Learning en-subtitle= kn-subtitle= en-abstract= kn-abstract=Purpose: This study aimed to evaluate the potential use of machine learning to automatically classify electromyography (EMG) data into bruxism simulated movement with tooth contact (BMwTC), bruxism simulated movement without tooth contact (BMwoTC), and non-bruxism movement (non-BM).
Methods: Twelve eligible healthy participants (female/male: 2/10, mean age: 35.3?±?8.4?years) were asked to perform the simulated movements (all the tasks were performed five times for 5?s each with a 30-s rest interval). The electrodes were placed on the masseter, infrahyoid, inframandibular, and chin muscles. A sound sensor was placed adjacent to the masseter. The EMG and sound data were sampled at 1 and 44.1?kHz, respectively. Single- and multi-stream hidden Markov models (HMMs) were used to automatically discriminate the tested behavior from the others using a hamming window with 100?ms and shift length of 50?ms. The leave-one-out method was used for training and testing the model, with data from 11 participants used for training and one for testing. Each participant was evaluated, and the final performance was measured by averaging the results of 12 classification trials. The validity of the discrimination was assessed by calculating the harmony mean values using six EMG signals and the sound data.
Results: The masseter EMG demonstrated significantly higher discrimination accuracy in the single-stream model (p? < 0.05, One-way ANOVA, Tukey HDS). The multi-stream model also demonstrated higher accuracy; however, no significant difference was observed. Notably, the accuracy of BMwoTC was less than 0.5.
Conclusion: The machine-learning-based discriminative system accurately discriminates BMwTC from non-BM using masseter EMG. en-copyright= kn-copyright= en-aut-name=MinakuchiHajime en-aut-sei=Minakuchi en-aut-mei=Hajime kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=NagasakiMitsuhiro en-aut-sei=Nagasaki en-aut-mei=Mitsuhiro kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=??nhL?c Ho?ng en-aut-sei=??nh en-aut-mei=L?c Ho?ng kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=MikiHaruna en-aut-sei=Miki en-aut-mei=Haruna kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OmoriKo en-aut-sei=Omori en-aut-mei=Ko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=NishimuraTazuko en-aut-sei=Nishimura en-aut-mei=Tazuko kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=KubokiTakuo en-aut-sei=Kuboki en-aut-mei=Takuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MinematsuNobuaki en-aut-sei=Minematsu en-aut-mei=Nobuaki kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=2 en-affil=Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo kn-affil= affil-num=3 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=4 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=5 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=6 en-affil=Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo kn-affil= affil-num=7 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=8 en-affil=Department of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of Tokyo kn-affil= en-keyword=bruxism kn-keyword=bruxism en-keyword=dentistry kn-keyword=dentistry en-keyword=electromyography kn-keyword=electromyography en-keyword=EMG discrimination kn-keyword=EMG discrimination en-keyword=machine learning kn-keyword=machine learning END start-ver=1.4 cd-journal=joma no-vol=10 cd-vols= no-issue=1 article-no= start-page=57 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2024 dt-pub=20241121 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Implant-supported fixed prostheses with cantilever: a systematic review and meta-analysis en-subtitle= kn-subtitle= en-abstract= kn-abstract=Purpose This systematic review (SR) aimed to investigate whether the presence of a cantilever affects the results of implant treatment for partial edentulism, including an analysis of the anterior and posterior regions of the dental arches.
Methods An electronic search was performed, and original articles published between 1995 and November 2023 were included. The outcomes were the implant survival rate, patient satisfaction, occurrence of mechanical complications, and marginal bone loss around the implants. Two SR members independently examined the validity of the studies, extracted evidence from the included studies, and performed risk of bias assessment, comprehensive evidence evaluation, and meta-analysis.
Results Nine studies met our inclusion criteria. Implant survival rate tended to be lower in the cantilever group, and marginal bone loss tended to be higher in the cantilever group; however, there was no significant difference. There was no significant difference in patient satisfaction based on the presence or absence of a cantilever. Moreover, the incidence of mechanical complications was significantly higher in the cantilever group. According to the analysis of anterior and posterior regions, implant survival rate tended to be lower in the cantilever group of the posterior region, and marginal bone loss around the implants tended to be higher in the cantilever group of the anterior region.
Conclusion Implant-supported fixed prostheses with cantilevers did not negatively affect implant survival rate, marginal bone loss, or patient satisfaction. However, the incidence of mechanical complications significantly increased in the cantilever group. en-copyright= kn-copyright= en-aut-name=KondoYusuke en-aut-sei=Kondo en-aut-mei=Yusuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=SakaiKiyoshi en-aut-sei=Sakai en-aut-mei=Kiyoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MinakuchiHajime en-aut-sei=Minakuchi en-aut-mei=Hajime kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HorimaiTakuya en-aut-sei=Horimai en-aut-mei=Takuya kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=KubokiTakuo en-aut-sei=Kuboki en-aut-mei=Takuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=JSOI Clinical Guideline Working Group collaborators en-aut-sei=JSOI Clinical Guideline Working Group collaborators en-aut-mei= kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= affil-num=1 en-affil=Clinical Guideline Task-Force Members (2018-), Japanese Society of Oral Implantology (JSOI) kn-affil= affil-num=2 en-affil=Clinical Guideline Task-Force Members (2018-), Japanese Society of Oral Implantology (JSOI) kn-affil= affil-num=3 en-affil=Department of Oral Rehabilitation and Implantology, Okayama University Hospital kn-affil= affil-num=4 en-affil=The Library, School of Dentistry, Nihon University kn-affil= affil-num=5 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Faculty of Medicine Dentistry and Pharmaceutical Sciences kn-affil= affil-num=6 en-affil= kn-affil= en-keyword=Cantilever kn-keyword=Cantilever en-keyword=Fixed prostheses kn-keyword=Fixed prostheses en-keyword=Implants kn-keyword=Implants en-keyword=Partial edentulism kn-keyword=Partial edentulism en-keyword=Systematic review kn-keyword=Systematic review END start-ver=1.4 cd-journal=joma no-vol=58 cd-vols= no-issue= article-no= start-page=124 end-page=136 dt-received= dt-revised= dt-accepted= dt-pub-year=2022 dt-pub=202211 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Managements of sleep bruxism in adult: A systematic review en-subtitle= kn-subtitle= en-abstract= kn-abstract=This systematic review aimed to update the management of sleep bruxism (SB) in adults, as diagnosed using polysomnography (PSG) and/or electromyography (EMG). Management methods covered were oral appliance therapy (OAT) with stabilization splints, cognitive-behavioral therapy (CBT), biofeedback therapy (BFT), and pharmacological therapy. A comprehensive search was conducted on MEDLINE, Cochrane Library, and Web of Science up to October 1st, 2021. Reference list searches and hand searches were also performed by an external organization. Two reviewers for each therapy independently performed article selection, data extraction, and risk of bias assessment. The reviewers resolved any disagreements concerning the assortment of the articles by discussion. Finally, 11, 3, 14, and 22 articles were selected for each therapy. The results suggested that OAT tended to reduce the number of SB events, although there was no significant difference compared to other types of splints, that the potential benefits of CBT were not well supported, and that BFT, rabeprazole, clonazepam, clonidine, and botulinum toxin type A injection showed significant reductions in specific SB parameters, although several side effects were reported. It can be concluded that more methodologically rigorous randomized large-sample long-term follow-up clinical trials are needed to clarify the efficacy and safety of management for SB. en-copyright= kn-copyright= en-aut-name=MinakuchiHajime en-aut-sei=Minakuchi en-aut-mei=Hajime kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=FujisawaMasanori en-aut-sei=Fujisawa en-aut-mei=Masanori kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=AbeYuka en-aut-sei=Abe en-aut-mei=Yuka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=IidaTakashi en-aut-sei=Iida en-aut-mei=Takashi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=OkiKyosuke en-aut-sei=Oki en-aut-mei=Kyosuke kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=OkuraKazuo en-aut-sei=Okura en-aut-mei=Kazuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=TanabeNorimasa en-aut-sei=Tanabe en-aut-mei=Norimasa kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=NishiyamaAkira en-aut-sei=Nishiyama en-aut-mei=Akira kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= affil-num=1 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=2 en-affil=Division of Fixed Prosthodontics, Department of Restorative & Biomaterials Sciences, Meikai University School of Dentistry kn-affil= affil-num=3 en-affil=Department of Prosthodontics, School of Dentistry, Showa University kn-affil= affil-num=4 en-affil=Department of Oral Function and Fixed Prosthodontics, Nihon University School of Dentistry at Matsudo kn-affil= affil-num=5 en-affil=Section of Fixed Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu University kn-affil= affil-num=6 en-affil=Department of Stomatognathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Tokushima University Graduate School kn-affil= affil-num=7 en-affil=Department of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical University kn-affil= affil-num=8 en-affil=General Dentistry, Comprehensive Patient Care, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental University kn-affil= en-keyword=Sleep bruxism kn-keyword=Sleep bruxism en-keyword=Management kn-keyword=Management en-keyword=Systematic review kn-keyword=Systematic review en-keyword=Oral appliances kn-keyword=Oral appliances en-keyword=Biofeedback therapy kn-keyword=Biofeedback therapy en-keyword=Cognitive-behavioral therapy kn-keyword=Cognitive-behavioral therapy en-keyword=Pharmacological therapy kn-keyword=Pharmacological therapy END start-ver=1.4 cd-journal=joma no-vol=47 cd-vols= no-issue=3 article-no= start-page=281 end-page=288 dt-received= dt-revised= dt-accepted= dt-pub-year=2019 dt-pub=20191119 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=Association of masticatory muscle activity with sleep arousal and other concomitant movements during sleep en-subtitle= kn-subtitle= en-abstract= kn-abstract=OBJECTIVE:
This study aims to verify the associations among sleep bruxism (SB), sleep arousal (SA) and concurrent body movements.
MATERIAL AND METHODS:
Subjects underwent a standard overnight polysomnography test and audio-video recordings. Sleep quality was evaluated according to the Rechtschaffen and Kales criteria, while SA was determined as per the American Sleep Disorders Association criteria. Analyses were performed by an external institution after masking of the subjects' information. SB was assessed based on the presence/absence of rhythmic masticatory muscle activity (RMMA) episodes, which were identified by using electromyography of the masseter muscle. The observed simultaneous movements included lower leg movement (LLM), swallowing, face scratching, head movement, body movement, eye blinking, coughing, licking, sighing, body scratching, lip sucking, somniloquy and yawning. The LLM was determined visually, as well as through an increase in the tibialis electromyogram signal. Other movements were visually assessed using audio-video recordings. The incidences of all the simultaneous movements were compared between RMMA with intercurrent SA (SAwRMMA; RMMA episode derived from a masseter electromyogram showing more than 10% of maximum voluntary contraction) and SA without RMMA (SAw/oRMMA).
RESULTS:
Fourteen subjects were included in this study (females/males: 4/10, mean age: 31.5 ± 5.7 years). Among these, LLM, swallowing, body movement, licking, body scratching and lip sucking were frequently observed in SAwRMMA episodes than in SAw/oRMMA episodes, significantly. However, the non-specific simultaneous movements were higher observed in SAw/oRMMA episodes than that in SAwRMMA.
CONCLUSION:
Our results suggest that SB is concurrently activated with LLM in relation to arousal. en-copyright= kn-copyright= en-aut-name=MikiHaruna en-aut-sei=Miki en-aut-mei=Haruna kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=1 ORCID= en-aut-name=MinakuchiHajime en-aut-sei=Minakuchi en-aut-mei=Hajime kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=2 ORCID= en-aut-name=MiyagiMayu en-aut-sei=Miyagi en-aut-mei=Mayu kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=3 ORCID= en-aut-name=HaraEmilio Satoshi en-aut-sei=Hara en-aut-mei=Emilio Satoshi kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=4 ORCID= en-aut-name=ShigemotoShuji en-aut-sei=Shigemoto en-aut-mei=Shuji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=5 ORCID= en-aut-name=SuzukiYoshitaka en-aut-sei=Suzuki en-aut-mei=Yoshitaka kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=6 ORCID= en-aut-name=MaekawaKenji en-aut-sei=Maekawa en-aut-mei=Kenji kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=7 ORCID= en-aut-name=MatsukaYoshizo en-aut-sei=Matsuka en-aut-mei=Yoshizo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=8 ORCID= en-aut-name=ClarkGlenn T. en-aut-sei=Clark en-aut-mei=Glenn T. kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=9 ORCID= en-aut-name=KubokiTakuo en-aut-sei=Kuboki en-aut-mei=Takuo kn-aut-name= kn-aut-sei= kn-aut-mei= aut-affil-num=10 ORCID= affil-num=1 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=2 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=3 en-affil=Department of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate School kn-affil= affil-num=4 en-affil=Department of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=5 en-affil=Department of Fixed Prosthodontics, School of Dental Medicine, Tsurumi University kn-affil= affil-num=6 en-affil=Department of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate School kn-affil= affil-num=7 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= affil-num=8 en-affil=Department of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate School kn-affil= affil-num=9 en-affil=Advanced Program in Orofacial Pain and Oral Medicine, Ostrow School of Dentistry, University of Southern California kn-affil= affil-num=10 en-affil=Department of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical Sciences kn-affil= en-keyword=concomitant movement kn-keyword=concomitant movement en-keyword=non-specific simultaneous movements kn-keyword=non-specific simultaneous movements en-keyword=polysomnography assessment kn-keyword=polysomnography assessment en-keyword=rhythmic masticatory muscle activity kn-keyword=rhythmic masticatory muscle activity en-keyword=sleep arousal kn-keyword=sleep arousal en-keyword=sleep bruxism kn-keyword=sleep bruxism END start-ver=1.4 cd-journal=joma no-vol= cd-vols= no-issue= article-no= start-page= end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=1999 dt-pub=19990325 dt-online= en-article= kn-article= en-subject= kn-subject= en-title= kn-title=非復位性関節円板前方転位症例における各種初期治療の有効性 Randomized Controlled Trialによる解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name= en-aut-sei= en-aut-mei= kn-aut-name=水口一 kn-aut-sei=水口 kn-aut-mei=一 aut-affil-num=1 ORCID= affil-num=1 en-affil= kn-affil=岡山大学 END