Objectives:We aimed to characterize the association between jaw muscle contractions and respiratory events in patients with obstructive sleep apnea syndrome (OSAS) investigate responsiveness of comparison that leg muscles terms arousal types states.Methods: Polysomnographic (PSG) recordings were performed 19 OSAS (F/M: 2/17; 53.1 ± 13.7 years; AHI: 31.8 19.9/h) no concomitant bruxism or other sleep-related movement disorders.Muscle unilateral masseter (MAS) anterior tibialis (AT) scored...

Patients with removable partial dentures or complete do not demonstrate masticatory function to the same level as patients a full set of natural teeth. The purpose this study was characterize relationship between reduction function, in terms performance and bite force, existence remaining occlusal supports assessed by Eichner index. One hundred eighteen denture wearers were selected for analyses. These subjects divided into four groups depending upon number supports. Seventy dentate support...

Establishing the optimum occlusal vertical dimension (OVD) in prosthetic treatment is an important clinical procedure. No methods are considered to be scientifically accurate determining reduced OVD patients with missing posterior teeth. The purpose of this study was derive a new formula predict lower facial height (LFH) using cephalometric analysis.Fifty-eight lateral radiographs Japanese residents (mean age, 28.6 years) complete natural dentition were used for study. Conventional skeletal...

Abstract Background The purpose of this study was to investigate the trueness intraoral scanning residual ridge in edentulous regions during vitro evaluation inter-operator validity. Methods Both maxillary and partially mandibular models were selected as a simulation model. As reference data, two performed using dental laboratory scanner (D900, 3Shape A/S). Five dentists used an (TRIOS 2, A/S) five times capture “zig-zag” technique used. They did not have experience with scanners clinical...

To compare the fabrication accuracy of clasps made using different CAD/CAM technologies.Five were created three technologies: casting from a resin pattern additive manufacturing; computer numerical controlled milling; and selective laser sintering (SLS). Differences between scan data CAD statistically analyzed.There significant differences in all parts clasps. The difference values small overall for SLS clasp.This study demonstrated that clasp is outstanding terms reproducibility.

To evaluate fit and retention of cobalt-chromium removable partial denture (RPD) frameworks fabricated with selective laser melting (SLM).Three types framework for clasp-retained RPDs were virtually designed using SLM (n = 30). For comparison, 30 additional produced conventional lost-wax casting. A biomechanical model was created, incorporating extracted teeth mounted on flexible metal posts. Using this model, horizontal constraint forces resulting from a misfit measured strain gauges, while...

Summary The aim of this study was to explore the relationship between patterns missing occlusal units (OUs) and oral health‐related quality life (OHRQoL) in subjects with shortened dental arches (SDAs). Subjects SDAs were recruited consecutively for 1 month from six university‐based prosthodontic clinics. In total, 115 SDA participated (mean age, 58·5 ± 10·0 years; 71% female). location number teeth examined OUs calculated. To evaluate OHRQoL, Japanese version Oral Health Impact Profile...

Abstract Background: The purpose of this study was to investigate the differences in location main occluding area with reduction occlusal support and evaluate subsequent impairment masticatory ability. Methods: One hundred two patients were recruited according Eichner’s index, which is based on number zones. Each subject instructed clench a piece temporary stopping particular that preferably used during mastication. judged by locating tooth rested. Subjective ability self‐assessed means...

The objective of this study was to investigate the low temperature degradation characteristics 2 types high strength yttria-stabilized tetragonal zirconia polycrystal (Y-TZP) in order evaluate its suitability for implant body, superstructure or abutment. Disk-shaped conventional Y-TZP (0.25 mass% alumina) subjected hot isostatic press treatment (HIP-Y-TZP) and Y-TZP/4Al2O3 with additional alumina (4.0 mass%) were mirror-polished. Accelerated aging tests 134°C 5 h at 0.2 MPa 180°C 1.0...

The purpose of this study was to investigate the influence bruxism on stomatognathic system. A new device for measuring nocturnal mandibular movements developed using a PIN photodiode sensor, integrated with polysomnography including electromyography (EMG), electroencephalography (EEG) and electro oculography (EOG). One bruxing event defined depending upon EMG activities above 5% maximum voluntary contraction (MVC), movement each classified into three patterns (clenching, grinding mix)....

Patients with removable partial dentures or complete do not demonstrate masticatory function to the same level as patients a full set of natural teeth. The purpose this study was characterize relationship between reduction function, in terms performance and bite force, existence remaining occlusal supports assessed by Eichner index. One hundred eighteen denture wearers were selected for analyses. These subjects divided into four groups depending upon number supports. Seventy dentate support...

In the shortened dental arch condition, little is known of how patients adapt their jaw function during mastication to new oral environment. This study aimed investigate changes in mandibular movements when chewing region was changed from first molar premolar.Thirty clinical residents with natural dentitions were recruited. The subjects asked chew a piece beef jerky using either or premolar on preferred side. Three-dimensional trajectories lower incisors and both condyles analysed movement...

Sleep-related movement disorders are characterized by the specific phenotypes of muscle activities and movements during sleep. However, state-specific characteristics bursts sleep poorly understood. In this study, jaw-closing -opening electromyographic (EMG) jaw were quantified to characterize motor patterns in freely moving head-restrained guinea pigs. During non-rapid eye (NREM) sleep, both muscles irregularly activated terms duration, activity, intervals. rapid (REM) clusters phasic...

Purpose This study investigated the usefulness of a newly proposed intraoral scanning method, using markers that can be used directly in oral cavity, order to improve accuracy impression taking residual ridge for fabrication removable partial dentures.Methods An scanner was scan dental model partially edentulous mandibular arch (Kennedy Class I). As markers, pieces dried pasta were used. The operation performed under three conditions. In Condition 1, on remaining teeth and without markers....

Aim: Inorganic polyphosphate exists as chains of phosphate molecules and is distributed in osteoblasts, regulates osteoblastic cell differentiation bone matrix calcification. The purpose this study was to clarify the effects inorganic on periodontitis. Material methods: Subgingival local irrigation with studied a randomised double‐blind 33 patients Scaling root planing were performed 1 week after initial examination. Results: No significant differences between group control detected each...