-
Journal of Clinical and Experimental... Dec 2020The aim of this systematic review was to analyze the types of human chewing simulator described in scientific literature. (Review)
Review
BACKGROUND
The aim of this systematic review was to analyze the types of human chewing simulator described in scientific literature.
MATERIAL AND METHODS
An electronic search was conducted in the databases PubMed, Embase and Scopus. The search strategy included 10 search terms: ""; "dental materials"; "shear strength"; "fatigue fracture"; "bite force"; "prosthetic materials"; "chewing simulator"; "chewing machine"; "simulated mastication"; and "dental wear simulator." Two researchers worked independently to assess the titles and abstracts of the articles. The quality of the trials selected was evaluated by means of the Consolidated Standards of Reporting Trials scale.
RESULTS
The electronic search identified 80 articles related to the topic of interest. After reading the full texts, ten works were selected. The articles focused mainly on the design of chewing simulators. Most of them were considered of moderate quality. Regarding the characteristics that an ideal chewing simulator should encompass, the devices described in articles varied greatly in terms of movement, periodontal ligament simulation, force sensors, and the materials tested.
CONCLUSIONS
No chewing simulator offers all the characteristics necessary to reproduce human masticatory movements and forces under the humidity and pH conditions of the oral cavity. A simulator that encompasses all these characteristics would make it possible to standardize trials involving simulated mastication. In vitro, dental materials, dental wear simulator.
PubMed: 33282141
DOI: 10.4317/jced.57279 -
Journal of Oral Rehabilitation Apr 2018No consensus has been reached regarding the best occlusal scheme for making complete dentures. Thus, the purpose of this systematic review was to compare bilateral... (Comparative Study)
Comparative Study Review
No consensus has been reached regarding the best occlusal scheme for making complete dentures. Thus, the purpose of this systematic review was to compare bilateral balanced occlusion (BBO) with other occlusal schemes (canine guidance, lingualised occlusion and zero degree) in complete dentures. The schemes were compared in terms of quality of life/satisfaction and masticatory performance. Two independent reviewers performed a comprehensive search of studies published in or before October 2017 using the PubMed/MEDLINE, Scopus and Cochrane Library databases. The search was performed in accordance with the Preferred Reporting Items for Systematic Reviews and Meta-Analyses (PRISMA) statement. The focused question was: "In conventional complete denture, is BBO better than lingualised occlusion, canine guidance and zero degree in terms of quality of life, patient satisfaction and masticatory performance/muscle activity?" Seventeen studies were selected for analysis. In total, there were 492 patients with a mean age of 64.78 years and a mean follow-up duration of 2.96 months (range: 1-6 months). All studies compared BBO with the other occlusal schemes. Eleven studies evaluated the influence of the occlusal scheme designs on quality of life and satisfaction, and 8 studies evaluated masticatory performance and muscle activity between BBO and the other occlusion schemes. The present systematic review indicated that BBO does not confer better quality of life/satisfaction or masticatory performance and muscle activity. Thus, lingualised occlusion can be considered a predictable occlusal scheme for complete dentures in terms of quality of life/satisfaction and masticatory performance, while canine guidance can be used to reduce muscular activity.
Topics: Dental Occlusion, Balanced; Denture Design; Denture, Complete; Humans; Mastication; Mouth, Edentulous; Patient Satisfaction; Quality of Life
PubMed: 29314199
DOI: 10.1111/joor.12607 -
Oral Radiology Jan 2021Proteus syndrome (PS) is an extremely rare disorder with asymmetric and disproportionate bone overgrowth. Craniofacial abnormalities in PS are less frequent than... (Review)
Review
OBJECTIVES
Proteus syndrome (PS) is an extremely rare disorder with asymmetric and disproportionate bone overgrowth. Craniofacial abnormalities in PS are less frequent than skeletal abnormalities. Although there are recognized oral and maxillofacial manifestations of PS, few case reports describing these manifestations are available. Thus, the objective of this systematic review and case report is to describe oral and maxillofacial manifestations of PS and to report a PS case.
METHODS
A 31-year-old male presented with restricted mouth opening and pain during mastication. A panoramic radiograph and an occlusal radiograph were obtained. Reports with relevant keywords were assessed. Data were summarized and demonstrated using a critical appraisal checklist for case reports.
RESULTS
The panoramic radiograph demonstrated unilateral overgrowth of the mandible, impacted teeth, and deciduous prolonged retention. Thirteen PS case reports were identified.
CONCLUSIONS
Proteus syndrome oral and maxillofacial manifestations may include dental agenesis, impacted teeth, malocclusion, asymmetric dental growth and maturation, frontal line displacement, asymmetric tongue enlargement, mandibular hemihypertrophy and asymmetry, presence of exostoses/hyperostosis, degenerative changes in the temporomandibular joint, alterations of maxillary and mandibular vertical and/or horizontal growth, and enlargement of mandibular canal and foramen. The PROSPERO systematic review registration number is CRD42019140942.
Topics: Adult; Humans; Male; Mandible; Maxilla; Proteus Syndrome; Radiography, Panoramic; Tooth, Impacted
PubMed: 31734933
DOI: 10.1007/s11282-019-00416-y -
BMC Oral Health Jan 2024Temporomandibular disorders (TMD) are manifested by soreness in the jaw joint area and jaw muscles, clicks or creaks when opening or closing the mouth. All these... (Meta-Analysis)
Meta-Analysis
BACKGROUND
Temporomandibular disorders (TMD) are manifested by soreness in the jaw joint area and jaw muscles, clicks or creaks when opening or closing the mouth. All these symptoms can be disabling and occur during chewing and when the patient yawns or speaks. Several classes of drugs are used to treat symptoms. This review aims to assess which drug suits the different signs.
METHODS
Pubmed, Web of Science and Lilacs were systematically searched until 01/02/2023. Clinical trials were selected that dealt with drugs used in temporomandibular dysfunction RESULTS: Out of 830 papers, eight studies were included. The Meta-Analysis with Continuous Outcomes with Pre-Calculated Effect Sizes resulted in the rejection that there is intergroup variability (p.0.74).
CONCLUSIONS
Treatment of orofacial pain is still a significant challenge for dentistry. We can conclude that there is no drug of first choice in the treatment of temporomandibular pain. However, the clinician must distinguish the type of pain and the aetioloic cause of the pain so that the patient can be treated and managed pharmacologically.
Topics: Humans; Facial Pain; Mastication; Temporomandibular Joint; Temporomandibular Joint Disorders
PubMed: 38218874
DOI: 10.1186/s12903-023-03524-8 -
Indian Journal of Surgical Oncology Jun 2023To evaluate the QoL before and after prosthetic rehabilitation of partial mandibulectomy patients based on the type of surgery, effects of radiation, the type of... (Review)
Review
UNLABELLED
To evaluate the QoL before and after prosthetic rehabilitation of partial mandibulectomy patients based on the type of surgery, effects of radiation, the type of prosthesis, and to enlist their outcome on the rehabilitation. Literature search as per PICO format was carried out within a time range from January 2000 to June 2021. The review followed PRISMA guidelines and registered with the PROSPERO(CRD42021258472). The focus question was established as per the PICO format (Population, Intervention, Comparison, Outcome). The population involved partial mandibulectomy individuals with prosthetic rehabilitation as an intervention. The outcome, quality of life (QoL), was compared with the pre and post partial mandibulectomy patients rehabilitated with a prosthesis. The search yielded 367 articles and based on the search criteria only 7 articles were suitable for qualitative analysis. Marginal resection of the mandible is less aggressive than segmental resection which provided function, phonation, and esthetics at acceptable levels but the food mixing ability was reduced when resection is accompanied by glossectomy. However, the perceived chewing ability and OHRQoL were not accountable to the extent of surgical excision. An overall increase in the QoL on rehabilitation with acrylic prosthesis depicting satisfactory functionality with a considerable improvement in mastication, speech, and social life. QoL and Denture Satisfaction Index did not differ based on the number of implants in an implant overdenture prosthesis, but the chewing ability was improved. An increase in the number of remaining occlusal units improved the overall QoL. Restoration of the function, psychological comfort, and improvement in esthetics was significant in patients who underwent prosthetic rehabilitation. The QoL between conventional and implant prostheses was observed to be more similar, and the effect of remaining hard and soft tissue structures has a major influence on patient comfort signifying the influence of the extent of surgical excision.
SUPPLEMENTARY INFORMATION
The online version contains supplementary material available at 10.1007/s13193-022-01664-x.
PubMed: 37324294
DOI: 10.1007/s13193-022-01664-x -
Materials (Basel, Switzerland) Nov 2021Dental surgery implantation has become increasingly important among procedures that aim to rehabilitate edentulous patients to restore esthetics and the mastication... (Review)
Review
Dental surgery implantation has become increasingly important among procedures that aim to rehabilitate edentulous patients to restore esthetics and the mastication ability. The optimal stability of dental implants is correlated primarily to the quality and quantity of bone. This systematic literature review describes clinical research focusing on the correlation between cortical bone thickness and primary/secondary stability of dental fixtures. To predict successful outcome of prosthetic treatment, quantification of bone density at the osteotomy site is, in general, taken into account, with little attention being paid to assessment of the thickness of cortical bone. Nevertheless, local variations in bone structure (including cortical thickness) could explain differences in clinical practice with regard to implantation success, marginal bone resorption or anchorage loss. Current knowledge is preliminarily detailed, while tentatively identifying which inconclusive or unexplored aspects merit further investigation.
PubMed: 34885335
DOI: 10.3390/ma14237183 -
Clinical Oral Implants Research Sep 2023This review evaluated the effects of rehabilitation with implant-supported prostheses on the oral function of completely edentulous adults. (Meta-Analysis)
Meta-Analysis
OBJECTIVES
This review evaluated the effects of rehabilitation with implant-supported prostheses on the oral function of completely edentulous adults.
MATERIALS AND METHODS
Systematic literature searches were performed to identify records reporting on oral function in completely edentulous adults rehabilitated with implant-supported prostheses. Meta-analyses were performed on various outcomes including bite force, masticatory performance, muscle activity, mandibular movement/chewing pattern, and salivary flow.
RESULTS
5507 records were identified. Thirty studies qualified for data extraction and analysis. The kappa (𝛋) for the search and identification strategy ranged between 0.50 and 1.00. Meta-analysis was performed grouping the studies by outcomes and split by time points of 6-12 months, 12-36 months, and >36 months after implant therapy. The meta-analyses revealed a significant improvement in oral function of completely edentulous adults after rehabilitation with implant-supported prostheses at 6-12 months (Z = -4.895, p < .001; 95% CI: -0.703, -0.301; τ = .609; Q = 114.953, df = 17, p < .001; I = 85.2%), at 12-36 months (Z = -4.886, p < .001; 95% CI: -0.580, -0.248; τ = .908; Q = 280.611, df = 35, p < .001; I = 87.5%) and at more than 36 months (Z = -9.108, p < .001; 95% CI: -1.472, -0.951; τ = .019; Q = 7.918, df = 7, p = .340; I = 11.6%). The included studies demonstrated a low to moderate risk of bias.
CONCLUSIONS
This systematic review concluded that the oral function of completely edentate adults significantly improved with implant-supported/retained prostheses, even when only one jaw received implant therapy. Therefore, implant therapy should be promoted for edentulous adults to alleviate the shortcomings of conventional complete removable dental prostheses.
Topics: Adult; Humans; Dental Prosthesis, Implant-Supported; Dental Implants; Bite Force; Mandible; Mastication; Mouth, Edentulous
PubMed: 37750517
DOI: 10.1111/clr.14068 -
Journal of Esthetic and Restorative... Apr 2022An assessment was performed to identify and evaluate dental enamel wear caused by monolithic zirconia restoration. Literature searches were conducted in PubMed, Science... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVE
An assessment was performed to identify and evaluate dental enamel wear caused by monolithic zirconia restoration. Literature searches were conducted in PubMed, Science Direct, Cochrane Evidence, and the Cochrane Library up to May 2020.
MATERIAL AND METHODS
Studies were selected for systematic review according to the inclusion (articles conducted on the wear of enamel samples opposing monolithic zirconia) and exclusion (case reports, non-English articles, and monolithic zirconia samples facing other materials rather than human enamel) criteria. Of those, articles on polished and glazed monolithic zirconia subjected to a 50 N vertical load with a range of 240,000-250,000 cycles, equivalent to 1 year of in vivo mastication, were included in the meta-analysis.
RESULTS
In total, 3968 articles were pooled. Twenty-five articles met the inclusion criteria for the systematic review. Three studies were included in the meta-analysis. The results showed that the enamel wear against monolithic zirconia was within the statistically accepted level. Moreover, the polished monolithic zirconia surface caused less enamel wear than the glazed surface.
CONCLUSION
This review indicates that monolithic zirconia restorations cause acceptable antagonist enamel wear. Moreover, the meta-analysis results agreed that the final restoration's surface texture plays an essential role in the wear process.
CLINICAL SIGNIFICANCE
Monolithic zirconia restorations have been widely used in dental practice because they eliminate the chipping problems resulting from using veneered restorations. With recent technology development, monolithic zirconia has obtained more esthetic features and a more natural look. However, due to the high strength and surface roughness of monolithic zirconia, wear on the antagonist's teeth was detected. The results showed that this wear amount was statistically acceptable and lower than other ceramics such as feldspathic porcelain and enamel. Furthermore, surface treatment methods must be applied to minimize tooth wear, as polished or glazed surfaces interfere with enamel loss.
Topics: Dental Enamel; Dental Porcelain; Humans; Materials Testing; Surface Properties; Tooth Wear; Zirconium
PubMed: 34623015
DOI: 10.1111/jerd.12823 -
Journal of Dentistry Dec 2015To explore the effect of soft denture liners on the masticatory performance and muscle activity of edentulous patients wearing complete dentures, as determined by using... (Review)
Review
OBJECTIVES
To explore the effect of soft denture liners on the masticatory performance and muscle activity of edentulous patients wearing complete dentures, as determined by using objective measurement methods.
DATA
Randomized controlled clinical trials and Cross-over studies that evaluated the masticatory capacity and muscle activity in denture wearers with and without soft denture liners were included in this systematic review.
SOURCES
A comprehensive literature search was performed via electronic databases using the appropriate key words. The last search took place in September 2014.
STUDY SELECTION
The potentially appropriate articles were identified and evaluated for eligibility through a predefined review process conducted by two examiners. Six out of the 176 identified records were included for quality and systematic assessment.
CONCLUSIONS
The observed clinical and methodological diversity determined the narrative approach for the pooling of the findings. According to the studies brought together for the current systematic review, soft denture liners provided denture wearers with increased masticatory function compared to conventional denture base materials. Specifically, the use of long-term silicone liners significantly improved the mastication parameters. The observed intervention effects suggest further studies of higher quality to allow reliable conclusions to be drawn and to strengthen the clinical significance of these materials to patient's functionality.
CLINICAL SIGNIFICANCE
Soft denture lining materials have been suggested to address functional problems arising during complete denture function. This study was designed to systematically review the impact of soft liners' use on the masticatory efficiency in denture wearers.
Topics: Cross-Over Studies; Dental Materials; Dental Restoration Wear; Denture Bases; Denture Liners; Denture, Complete; Humans; Mastication; Randomized Controlled Trials as Topic
PubMed: 26404406
DOI: 10.1016/j.jdent.2015.09.005 -
Effects of chewing on appetite, food intake and gut hormones: A systematic review and meta-analysis.Physiology & Behavior Nov 2015To seek insights into the relationship between chewing, appetite, food intake and gut hormones, and to consider potentially useful recommendations to promote benefits of... (Meta-Analysis)
Meta-Analysis Review
OBJECTIVES
To seek insights into the relationship between chewing, appetite, food intake and gut hormones, and to consider potentially useful recommendations to promote benefits of chewing for weight management.
MATERIALS AND METHODS
Papers were obtained from two electronic databases (Medline and Cochrane), from searches of reference lists, and from raw data collected from the figures in the articles. A total of 15 papers were identified that detailed 17 trials. All 15 papers were included in the systematic review; however, a further five studies were excluded from the meta-analysis because appropriate information on hunger ratings was not available. The meta-analysis was conducted on a total of 10 papers that detailed 13 trials.
RESULTS
Five of 16 experiments found a significant effect of chewing on satiation or satiety using self-report measures (visual analogue scales, VASs). Ten of 16 experiments found that chewing reduced food intake. Three of five studies showed that increasing the number of chews per bite increased relevant gut hormones and two linked this to subjective satiety. The meta-analysis found evidence of both publication bias and between study heterogeneity (IA(2) = 93.4%, tau(2) = 6.52, p < 0.001) which decreased, but remained, when covariates were considered. Analysis of the heterogeneity found a substantial effect of the fasting period where the duration of fasting influenced the decrease in hunger due to chewing. Prolonged mastication significantly reduces self-reported hunger levels (hunger: − 2.31 VAS point, 95% CI [− 4.67, − 1.38], p < 0.001).
CONCLUSIONS
Evidence currently suggests that chewing may decrease self-reported hunger and food intake, possibly through alterations in gut hormone responses related to satiety. Although preliminary, the results identify a need for additional research in the area. Focused, uniform, experimental designs are required to clearly understand the relationships that exist between mastication, appetite, satiety, food intake and, ultimately, body weight.
Topics: Appetite; Eating; Gastrointestinal Hormones; Humans; Hunger; Mastication; Satiation
PubMed: 26188140
DOI: 10.1016/j.physbeh.2015.07.017