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Journal of Oral Rehabilitation Jun 2021A large number of methodological procedures and experimental conditions are reported to describe the masticatory process. However, similar terms are sometimes employed... (Review)
Review
A large number of methodological procedures and experimental conditions are reported to describe the masticatory process. However, similar terms are sometimes employed to describe different methodologies. Standardisation of terms is essential to allow comparisons among different studies. This article was aimed to provide a consensus concerning the terms, definitions and technical methods generally reported when evaluating masticatory function objectively and subjectively. The consensus is based on the results from discussions and consultations among world-leading researchers in the related research areas. Advantages, limitations and relevance of each method are also discussed. The present consensus provides a revised framework of standardised terms to improve the consistent use of masticatory terminology and facilitate further investigations on masticatory function analysis. In addition, this article also outlines various methods used to evaluate the masticatory process and their advantages and disadvantages in order to help researchers to design their experiments.
Topics: Consensus; Humans; Mastication
PubMed: 33638156
DOI: 10.1111/joor.13161 -
Journal of the Science of Food and... Apr 2022Snacks have accompanied people for a long time, meeting our needs for something fast and filling between meals. Societies and technologies have changed, and so have... (Review)
Review
Snacks have accompanied people for a long time, meeting our needs for something fast and filling between meals. Societies and technologies have changed, and so have snacks, adapting to people's daily lives, concerns, and demands. Although traditional snacks, such as potato chips, are still ubiquitous and popular worldwide, there is not unanimity around them anymore, since many people have been looking for healthier snacks. Studies have been carried out to propose healthier snack options by changing their composition and/or techniques to produce them, minimizing contents of energy-dense components and/or maximizing the retention or bioavailability of nutrients. This mini-review presents the main trends on development of snacks and future perspectives. © 2021 Society of Chemical Industry.
Topics: Energy Intake; Humans; Mastication; Nutrients; Snacks
PubMed: 34859443
DOI: 10.1002/jsfa.11701 -
The Angle Orthodontist Mar 2022To investigate the masticatory (masticatory performance, bite force, swallowing threshold, muscle activity, and questionnaires) and nutritional (nutrient intake) impacts... (Review)
Review
OBJECTIVES
To investigate the masticatory (masticatory performance, bite force, swallowing threshold, muscle activity, and questionnaires) and nutritional (nutrient intake) impacts of the activation and/or installation of different orthodontic appliances (fixed labial, lingual appliances, and clear aligners).
MATERIALS AND METHODS
Six electronic databases and gray literature were searched (up to May 2021) for relevant studies evaluating mastication and nutrition after activation/installation of orthodontic appliances. This review followed PRISMA guidelines and was registered at PROSPERO (CRD42020199510). The risk of bias (RoB 2 and ROBINS-I) and evidence quality Grading of Recommendations Assessment, Development, and Evaluation were analyzed.
RESULTS
Of 4226 recorded and screened, 15 studies were finally included. Masticatory performance (standardized mean difference [SMD]: 1.069; 95% coefficient interval [CI]: 0.619 to 1.518) and bite force (SMD: -2.542; 95% CI: -4.867 to -0.217) reduced in the first 24 to 48 hours of fixed labial appliance installation/activation, but they were both normalized after 30 days (P > .05). The swallowing threshold remained constant (P > .05). Nutritional intake was rarely reported but showed copper (P = .002) and manganese (P = .016) reductions, with higher calorie and fat intake (P < .05). Lingual appliances impacted chewing more than labial, and clear aligner wearers reported fewer chewing problems (P < .001). Low to very low levels of evidence were found.
CONCLUSIONS
Based on low to very low levels of evidence, mastication was reduced during the first 24 to 48 hours of fixed labial appliance activation/installation, but it was transitory (up to 30 days). Due to insufficient data, the nutritional impact of orthodontic appliances was not conclusive.
Topics: Bite Force; Mastication; Orthodontic Appliances; Orthodontic Appliances, Fixed; Tongue
PubMed: 34878525
DOI: 10.2319/061221-469.1 -
The International Journal of Oral &... 2022This study examined the effect of dental implant rehabilitation on masticatory function following jaw reconstruction.
PURPOSE
This study examined the effect of dental implant rehabilitation on masticatory function following jaw reconstruction.
MATERIALS AND METHODS
Patients who received dental rehabilitation after jaw reconstruction with a fibular or iliac bone flap from 2012 to 2018 were examined for masticatory efficiency, electromyographic (EMG) activity of the masticatory muscles, and the distribution of occlusal force. The masticatory efficiency was measured by a spectrophotometer. The asymmetry index of the masticatory muscle was calculated by EMG measurement, and the asymmetry index of the occlusal force was calculated by T-scan analysis.
RESULTS
A total of 32 patients were examined, 13 with implant-retained fixed dental prostheses, 9 with implant-retained removable dental prostheses, and 10 with removable dental prostheses. Masticatory efficiency was significantly lower in the removable dental prosthesis group (2.29 ± 0.19) than in the implant-retained removable dental prosthesis (2.45 ± 0.03, P < .05) and implant-retained fixed dental prosthesis groups (2.45 ± 0.03, P < .05). Moreover, the asymmetry index of the masticatory muscle while chewing and clenching was significantly higher in the removable dental prosthesis group (0.099 ± 0.046 and 0.107 ± 0.042, respectively) than in the implant-retained removable dental prosthesis (0.032 ± 0.019 and 0.035 ± 0.021, respectively; P < .01) and implant-retained fixed dental prosthesis groups (0.038 ± 0.021 and 0.046 ± 0.023, respectively; P < .01). The asymmetry index of the occlusal force was also significantly higher in the removable dental prosthesis group than in the implant-retained removable dental prosthesis (0.38 ± 0.08, P < .01) and implant-retained fixed dental prosthesis groups (0.36 ± 0.11, P < .05).
CONCLUSION
The results of this study suggest that dental implant prostheses have a greater effect on masticatory function following jaw reconstruction, improving masticatory efficiency, EMG activity of the masticatory muscles, and occlusal force.
Topics: Bite Force; Dental Implants; Dental Prosthesis, Implant-Supported; Humans; Mastication; Masticatory Muscles
PubMed: 35727240
DOI: 10.11607/jomi.9337 -
Journal of Oral Science Oct 2023This study aimed to evaluate masticatory performance in cases where one molar was missing.
PURPOSE
This study aimed to evaluate masticatory performance in cases where one molar was missing.
METHODS
Participants were 156 adults with one molar missing from their natural teeth, who were divided into group A (without prosthetic treatment) and group B (with prosthetic treatment). The non-missing side was designated as A1 or B1, and the missing side was designated as A2 or B2. The amount of glucose eluted (AG) when the participants chewed a gummy jelly was measured and used as a parameter for masticatory performance. AG was compared between the non-missing side (A1, B1) and missing side (A2, B2), and between the first molar missing group and second molar missing group.
RESULTS
AG was significantly greater on the dentate side (P < 0.001) and was significantly less in the A2 group when the first molar was missing (P = 0.002). The rate of decrease of AG was 11.1%, 14.3%, and 8.4% in groups A+B, A, and B, respectively.
CONCLUSION
Masticatory performance appears to decrease even with only one missing molar. Although improvement is achieved by prosthetic treatment, performance remains inferior to that on the dentate side.
Topics: Adult; Humans; Mastication; Molar; Mouth, Edentulous; Glucose
PubMed: 37558434
DOI: 10.2334/josnusd.23-0212 -
Sensors (Basel, Switzerland) May 2021A series of eating behaviors, including chewing and swallowing, is considered to be crucial to the maintenance of good health. However, most such behaviors occur within...
A series of eating behaviors, including chewing and swallowing, is considered to be crucial to the maintenance of good health. However, most such behaviors occur within the human body, and highly invasive methods such as X-rays and fiberscopes must be utilized to collect accurate behavioral data. A simpler method of measurement is needed in healthcare and medical fields; hence, the present study concerns the development of a method to automatically recognize a series of eating behaviors from the sounds produced during eating. The automatic detection of left chewing, right chewing, front biting, and swallowing was tested through the deployment of the hybrid CTC/attention model, which uses sound recorded through 2ch microphones under the ear and weak labeled data as training data to detect the balance of chewing and swallowing. N-gram based data augmentation was first performed using weak labeled data to generate many weak labeled eating sounds to augment the training data. The detection performance was improved through the use of the hybrid CTC/attention model, which can learn the context. In addition, the study confirmed a similar detection performance for open and closed foods.
Topics: Attention; Deglutition; Feeding Behavior; Humans; Mastication; Sound
PubMed: 34066269
DOI: 10.3390/s21103378 -
Nutrients Nov 2022Current methods to detect eating behavior events (i.e., bites, chews, and swallows) lack objective measurements, standard procedures, and automation. The video... (Review)
Review
Current methods to detect eating behavior events (i.e., bites, chews, and swallows) lack objective measurements, standard procedures, and automation. The video recordings of eating episodes provide a non-invasive and scalable source for automation. Here, we reviewed the current methods to automatically detect eating behavior events from video recordings. According to PRISMA guidelines, publications from 2010-2021 in PubMed, Scopus, ScienceDirect, and Google Scholar were screened through title and abstract, leading to the identification of 277 publications. We screened the full text of 52 publications and included 13 for analysis. We classified the methods in five distinct categories based on their similarities and analyzed their accuracy. Facial landmarks can count bites, chews, and food liking automatically (accuracy: 90%, 60%, 25%). Deep neural networks can detect bites and gesture intake (accuracy: 91%, 86%). The active appearance model can detect chewing (accuracy: 93%), and optical flow can count chews (accuracy: 88%). Video fluoroscopy can track swallows but is currently not suitable beyond clinical settings. The optimal method for automated counts of bites and chews is facial landmarks, although further improvements are required. Future methods should accurately predict bites, chews, and swallows using inexpensive hardware and limited computational capacity. Automatic eating behavior analysis will allow the study of eating behavior and real-time interventions to promote healthy eating behaviors.
Topics: Feeding Behavior; Mastication; Food; Communications Media; Neural Networks, Computer
PubMed: 36432533
DOI: 10.3390/nu14224847 -
PloS One 2023Molar-incisor hypomineralization (MIH) is a qualitative defect of dental enamel that affects one or more permanent first molars, with or without involvement of the...
INTRODUCTION
Molar-incisor hypomineralization (MIH) is a qualitative defect of dental enamel that affects one or more permanent first molars, with or without involvement of the incisor teeth. This condition leads to challenges to dental care and treatment planning.
AIM
Based on the hypothesis that children who have MIH possibly present alterations in postural and masticatory activities and considering the absence of studies investigating these parameters, the present study evaluated the functionality of the stomatognathic system considering the mentioned aspects.
MATERIALS
The comparison of individuals with (MIHG; n = 32) and without MIH (CG; n = 32) was evaluated by electromyographic activity of the masseter and temporal muscles (right and left), as well as evaluation of the masticatory cycles during habitual mastication.
RESULTS
MIHG showed muscle hyperactivity in postural and dynamic conditions compared to the CG; higher electromyographic values for MIHG when compared to CG in the following postural conditions: at rest for the right temporal (p = 0.00) and left temporal muscles (p = 0.03); in the protrusion to the right temporal muscle (p = 0.02); in the right laterality for the right masseter (p = 0.00) and left temporal muscles (p = 0.01); in the left laterality for the right masseter (p = 0.03) and left temporal (p = 0.04) muscles. In dynamic conditions with consistent food, significance was observed for the left temporal (p = 0.01); and with soft food for the right (p = 0.01) and left temporal muscles (p = 0.04).
CONCLUSIONS
Children with MIH seem to have impaired functionality of the stomatognathic system. Children with MIH have alterations in the stomatognathic system.
Topics: Humans; Child; Molar Hypomineralization; Stomatognathic System; Mastication; Temporal Muscle; Dental Care; Dental Enamel Hypoplasia; Prevalence
PubMed: 36827292
DOI: 10.1371/journal.pone.0277030 -
Zeitschrift Fur Gerontologie Und... Aug 2021In the past few years the oral health of seniors has improved and more seniors retain their natural teeth until old age; however, the prevalence of oral diseases among... (Review)
Review
In the past few years the oral health of seniors has improved and more seniors retain their natural teeth until old age; however, the prevalence of oral diseases among seniors is still very high and a serious problem. Good oral health is, however, relevant for seniors as it influences the chewing function, the nutritional status and general satisfaction. In addition, diseases of the oral cavity show interactions with general health. The current article therefore provides an evidence-based overview of the oral health of seniors and highlights important relationships (nutritional status, oral health-related quality of life, general health). It also gives advice on when dental treatment may be indicated. Furthermore, instruments for assessing oral health, chewing function and oral health-related quality of life are presented and explained.
Topics: Dental Care; Humans; Mastication; Oral Health; Personal Satisfaction; Quality of Life
PubMed: 33900419
DOI: 10.1007/s00391-021-01893-9 -
BMC Oral Health Mar 2022Previous masticatory studies have focused on a variety of measurements of foods and boluses or kinematic parameters and sound during mastication. To date, the...
BACKGROUND
Previous masticatory studies have focused on a variety of measurements of foods and boluses or kinematic parameters and sound during mastication. To date, the masticatory sound research of has been limited due to the difficulties of sound collection and accurate analysis. Therefore, significant progress in masticatory sound has not been made. Meanwhile, the correlation between acoustic parameters and mastication performance remains unclear. For the purpose of exploring the acoustic parameters in measuring mastication performance, the bone-conduction techniques and sound analysis were used, and a statistical analysis of acoustic and occlusal parameters were conducted.
METHODS
The gnathosonic and chewing sounds of fifty-six volunteers with healthy dentate were recorded by a bone-conduction microphone and further analyzed by Praat 5.4.04 when intercuspally occluding natural foods (peanuts) were consumed. The granulometry of the expectorated boluses from the peanuts was characterized by the median particle size of the whole chewing sequence (D50) and the median particle size during the fixed chewing strokes (D50). The chewing time of the whole chewing sequence (CT), the chewing time of the fixed chewing strokes (CT), the chewing cycles (CC), and the chewing frequency (CF) were recorded and analyzed by the acoustic software. The acoustic parameters, including gnathosonic pitch, gnathosonic intensity, mastication sound pitch of the whole chewing sequence (MP), mastication sound pitch of the fixed chewing strokes (MP), mastication sound intensity of the whole chewing sequence (MI) and mastication sound intensity of the fixed chewing strokes (MI), were analyzed. Independent sample t-test, Spearman and Pearson correlation analyses were used where applicable.
RESULTS
Significant difference in parameters CC, MI, CF and D50 were found by sex (t-test, p < 0.01). The masticatory degree of the test foods was higher in women (CC, 24.25 ± 5.23; CF, 1.70 ± 0.21 s; D50, 1655.07 ± 346.21 μm) than in men (CC, 18.14 ± 6.38; CF, 1.48 ± 0.18 s; D50, 2159.21 ± 441.26 μm). In the whole chewing sequence study, a highly negative correlation was found between MI and D50, and a highly positive correlation was found between MI and CF (r = - 0.94, r = 0.82, respectively, p < 0.01). No significant correlation was found between the remaining acoustic parameters and mastication parameters. In the fixed chewing strokes study, a highly negative correlation was found between MI and D50 (r = - 0.85, p < 0.01). There was no significant correlation between the rest of the acoustic parameters and the mastication parameters.
CONCLUSIONS
Mastication sound intensity may be a valuable indicator for assessing mastication. Acoustic analysis can provide a more convenient and quick method of assessing mastication performance.
Topics: Acoustics; Biomechanical Phenomena; Female; Food; Humans; Male; Mastication; Particle Size
PubMed: 35291996
DOI: 10.1186/s12903-021-02018-9