WileyActa Medica Okayama1687-8728202612026Experimental Analysis of Automatic Discrimination Performance Between Simulated Bruxism and Non‐Bruxism Under Conscious Conditions Using Electromyography and Machine Learning7874254ENHajimeMinakuchiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesMitsuhiroNagasakiDepartment of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of TokyoLộc HoàngĐìnhDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesHarunaMikiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesKoOmoriDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesTazukoNishimuraDepartment of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of TokyoTakuoKubokiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesNobuakiMinematsuDepartment of Electrical Engineering and Information Systems, Graduate School of Engineering, The University of TokyoPurpose: 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).<br>
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.<br>
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.<br>
Conclusion: The machine-learning-based discriminative system accurately discriminates BMwTC from non-BM using masseter EMG.No potential conflict of interest relevant to this article was reported.Springer Science and Business Media LLCActa Medica Okayama2198-40341012024Implant-supported fixed prostheses with cantilever: a systematic review and meta-analysis57ENYusukeKondoClinical Guideline Task-Force Members (2018-), Japanese Society of Oral Implantology (JSOI)KiyoshiSakaiClinical Guideline Task-Force Members (2018-), Japanese Society of Oral Implantology (JSOI)HajimeMinakuchiDepartment of Oral Rehabilitation and Implantology, Okayama University HospitalTakuyaHorimaiThe Library, School of Dentistry, Nihon UniversityTakuoKubokiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Faculty of Medicine Dentistry and Pharmaceutical SciencesJSOI Clinical Guideline Working Group collaboratorsPurpose 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.<br>
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.<br>
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.<br>
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.No potential conflict of interest relevant to this article was reported.Elsevier Ltd.Acta Medica Okayama1882-7616582022Managements of sleep bruxism in adult: A systematic review124136ENHajimeMinakuchiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesMasanoriFujisawaDivision of Fixed Prosthodontics, Department of Restorative & Biomaterials Sciences, Meikai University School of DentistryYukaAbeDepartment of Prosthodontics, School of Dentistry, Showa UniversityTakashiIidaDepartment of Oral Function and Fixed Prosthodontics, Nihon University School of Dentistry at MatsudoKyosukeOkiSection of Fixed Prosthodontics, Division of Oral Rehabilitation, Faculty of Dental Science, Kyushu UniversityKazuoOkuraDepartment of Stomatognathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Tokushima University Graduate SchoolNorimasaTanabeDepartment of Prosthodontics and Oral Implantology, School of Dentistry, Iwate Medical UniversityAkiraNishiyamaGeneral Dentistry, Comprehensive Patient Care, Oral Health Sciences, Graduate School of Medical and Dental Sciences, Tokyo Medical and Dental UniversityThis 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.No potential conflict of interest relevant to this article was reported.WileyActa Medica Okayama0305-182X4732019Association of masticatory muscle activity with sleep arousal and other concomitant movements during sleep281288ENHarunaMikiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesHajimeMinakuchiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesMayuMiyagiDepartment of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate SchoolEmilio SatoshiHaraDepartment of Biomaterials, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesShujiShigemotoDepartment of Fixed Prosthodontics, School of Dental Medicine, Tsurumi UniversityYoshitakaSuzukiDepartment of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate SchoolKenjiMaekawaDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesYoshizoMatsukaDepartment of Stomatgnathic Function and Occlusal Reconstruction, Institute of Biomedical Sciences, Clinical Dentistry, Tokushima University Graduate SchoolGlenn T.ClarkAdvanced Program in Orofacial Pain and Oral Medicine, Ostrow School of Dentistry, University of Southern CaliforniaTakuoKubokiDepartment of Oral Rehabilitation and Regenerative Medicine, Okayama University Graduate School of Medicine, Dentistry and Pharmaceutical SciencesOBJECTIVE:<br/>
This study aims to verify the associations among sleep bruxism (SB), sleep arousal (SA) and concurrent body movements.<br/>
MATERIAL AND METHODS:<br/>
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).<br/>
RESULTS:<br/>
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.<br/>
CONCLUSION:<br/>
Our results suggest that SB is concurrently activated with LLM in relation to arousal. No potential conflict of interest relevant to this article was reported.Acta Medica Okayama1999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ENNo potential conflict of interest relevant to this article was reported.