Number Of Teeth Research Articles

Relação entre estado oral, função de deglutição e risco nutricional entre idosos com e sem doença de Parkinson

ABSTRACT Purpose To compare oral status, swallowing function (through instrumental and SLH assessment), and nutritional risk between dysphagic individuals with and without Parkinson's disease. Method This is a cross-sectional retrospective study based on data collected from medical records. It included 54 dysphagic older adults, divided into two groups according to the diagnosis of Parkinson's disease. The study collected data on the speech-language-hearing assessment of postural control, tongue mobility and strength, maximum phonation time (MPT), and cough efficiency. Oral status was assessed using the number of teeth and the Eichner Index. The level of oral intake and pharyngeal signs of dysphagia were analyzed with four food consistencies, according to the International Dysphagia Diet Standardization Initiative classification, using fiberoptic endoscopic evaluation of swallowing, for comparison between groups. The severity of pharyngeal residues was analyzed and classified with the Yale Pharyngeal Residue Severity Rating Scale, and the nutritional risk was screened with the Malnutrition Screening Tool. Results The group of older adults with Parkinson's disease was significantly different from the other group in that they had fewer teeth, unstable postural control, reduced tongue strength, reduced MPT, weak spontaneous coughing, pharyngeal signs, less oral intake, and nutritional risk. Conclusion Dysphagic older people with Parkinson's disease had different oral status, swallowing function, and nutritional risk from those without the diagnosis.

Molar Incisor Hypomineralisation as a Dental Caries Risk Factor - Is It True?

The development of the human dentition is susceptible to disruption owing to its intricate and delicate nature, encompassing variations in tooth number, anatomical configuration, and the characteristics of enamel, dentine, and cementum. This chapter will specifically address the prevalent defect of molar incisor hypomineralisation (MIH), which can impose a significant treatment burden on individuals. MIH is linked to deleterious alterations in the properties of affected enamel, which can lead to rapid enamel breakdown and carious lesion formation in those at a heightened caries risk. In addition, MIH is associated with tooth sensitivity, dental anxiety, difficulty eating, aesthetic concerns, and negative influence during the child's psychological growth, especially when the MIH is severe. Regarding dental caries, it is essential to note that MIH does not directly increase the risk of caries. However, MIH can alter the way the caries process manifests by creating niches where biofilm can accumulate, complicating oral cleaning efforts. Additionally, MIH adversely modifies the physicochemical properties of enamel, influencing how this "hardest of tissues" responds to cariogenic challenges.

Applicability of Object Detection to Microfossil Research: Implications From Deep Learning Models to Detect Microfossil Fish Teeth and Denticles Using YOLO‐v7

AbstractMicrofossils of fish teeth and denticles, referred to as ichthyoliths, provide critical information for depositional ages, paleo‐environments, and marine ecosystems, especially in pelagic realms. However, owing to their small size and rarity, it is time‐consuming and difficult to analyze large numbers of ichthyoliths from sediment samples, limiting their use in scientific studies. Here, we propose a method to automatically detect ichthyoliths from microscopic images using a deep learning technique. We applied YOLO‐v7, one of the latest object detection architectures, and trained several models under different conditions. The model trained under appropriate conditions with an original data set achieved an F1 score of 0.87. We then enhanced the data set efficiently using the pre‐trained model. We validated the practical applicability of the model by comparing the number of ichthyoliths detected by the model with those counted manually. This revealed that the best model can predict the number of triangular teeth, denticles and irregularly shaped teeth with minimal human intervention. This object detection method can extend the applicability of deep learning to a wider array of microfossils and has the potential to dramatically increase the spatiotemporal resolution of ichthyolith records for applications across disciplines.

Eruption of first permanent molar among a group of Iraqi children in relation to nutritional status

Background/Aim: The timing of a tooth's eruption can be affected by a variety of factors. The nutritional status has an impact on the development of a child's body. The purpose of the study was to analyse the number of children aged 6 to 9 in an Iraqi Arab population who had erupted permanent first molars and to examine how nutritional status affected the timing and level of emergence. Methods: A total of 330 boys and girls, in first grade elementary school, made up the sample. First molars that had erupted were noted, along with the level of the eruption. Each child's nutritional status was evaluated by recording their height and weight and body mass index (BMI) value was compared to the 2007 WHO reference. Results: Girls had higher number of erupted molars than boys did and a correlation between the number of erupted teeth and nutritional condition existed, with a higher mean number of erupted molars in obese children. Conclusion: BMI had an impact on the timing of the eruption of permanent first molars, a result that was primarily observed in females.

Implant-assisted removable partial denture restoration in small number of residual teeth in mandible: A case report

Implant-assisted removable partial denture restoration in small number of residual teeth in mandible: A case report

The tooth: A marker of developmental abnormalities

Tooth formation results from specific epithelial-mesenchymal interactions, which summarize a number of developmental processes. Tooth anomalies may thus reflect subclinical diseases of the kidney, bone and more broadly of the mineral metabolism, skin or nervous system. Odontogenesis starts from the 3rd week of intrauterine life by the odontogenic orientation of epithelial cells by a first PITX2 signal. The second phase is the acquisition of the number, shape, and position of teeth. It depends on multiple transcription and growth factors (BMP, FGF, SHH, WNT). These ecto-mesenchymal interactions guide cell migration, proliferation, apoptosis and differentiation ending in the formation of the specific dental mineralized tissues. Thus, any alteration will have consequences on the tooth structure or shape. Resulting manifestations will have to be considered in the patient phenotype and the multidisciplinary care, but also may contribute to identify the altered genetic circuity.

Impact of oral health on the quality of life of public servants: an analysis of associated factors.

Oral health encompasses functional and aesthetic aspects that directly impact an individual's daily activities. To analyze the impact of oral health conditions and related factors on the quality of life of public servants. This cross-sectional study was conducted with a sample of 89 public servants, both permanent and outsourced, from a federal public university in northeastern Brazil. Outcome was the impact of oral health on daily activities, determined by the Oral Impacts on Daily Performance indicator, and independent variables were sociodemographic characteristics, normative oral health conditions, access to and use of dental services, self-reported oral morbidity, self-perception of oral health, and absenteeism because of dental reasons. All data were analyzed using descriptive and analytical statistics, using the chi-squared test for heterogeneity and linear trend. The significance level used was set at 5%, with a 95% CI. Participants experienced at least one day of work impaired by dental problems in the six months prior to the survey. Prevalence of dental absenteeism was 7.9%. Variables associated with the impact of oral health on daily activities included gender, toothache, toothache intensity, self-reported oral health, awake bruxism, self-reported need for dentures, number of natural teeth in the upper and lower arches, and signs of temporomandibular dysfunction. Sociodemographic, clinical, and subjective oral health variables influence the impact of oral health on the daily activities of public servants.

A cross-sectional analysis of prevalence of dental anomalies by CBCT images: An institutional-based retrospective study

Abstract Aim: To determine the prevalence of different types of dental anomalies using cone-beam computed tomography (CBCT) images among the Al-Hasa population in Saudi Arabia and compare these variables between genders and nationalities. Materials and Methods: A retrospective study involving 509 CBCT images, in which patients were grouped based on their gender and nationality. The presence of dental anomalies was determined through the evaluation of CBCT images. Version 28 of the Statistical Package for the Social Sciences (IBM Corp., Armonk, NY, USA) was utilized to analyze the data, chi-square tests and multivariate analysis of variance were used, and P value was fixed at ≤0.05. Results: Out of the 509 CBCT images reviewed, a total of 135 patients (26.5%) exhibited one or more dental anomalies. Impacted canines had the highest prevalence among all types of impacted teeth, with a rate of 9.2%. Impacted premolars and molars (excluding third molars) had a lower prevalence of 2.6% and 1.2%, respectively. Impacted incisors had the lowest prevalence of 0.8%. Among dental anomalies affecting the number, position, and shape of teeth, the prevalence rates are as follows: congenitally missing teeth (6.7%), supernumerary teeth (2.2%), dilaceration (8.1%), microdontia (3.1%), ectopic eruption (2.6%), rotation (1.8%), and transposition (0.2%). Conclusions: The prevalence of dental anomalies is relatively high, with impacted canines being the most prevalent impacted teeth excluding third molars, whereas dilaceration was the most common anomaly affecting the shape of teeth. The prevalence of anomalies did not differ significantly between genders, except for rotation. Additionally, there was no significant difference reported in nationalities.

Calculation of wear products falling into the oil as a result of gear teeth wear

The article presents an overview of experimental studies of gear tooth wear, which results in the loss of wear products in the oil unit. The results of experimental studies on the wear of the tooth heads of the driving gears and the knives of the driven gear teeth are presented. The results of calculating the wear of the gear train of the unit after operating time are also presented. The coefficient of distribution of wear products between obvious gears according to the period of oil change in the unit has been established. The dependence of the linear wear of the head and leg of the teeth of the drive gear of the unit after 1000 hours of operation on the meshing height coefficient is calculated. An analytical calculation of the linear wear of gear teeth, an increase in the concentration of wear products in the oil of the unit and a decrease with an increase in the total number of gear teeth, tooth length and engagement module were made, and the results of the test work were given.

A new species of the genus Yoldiella (Bivalvia, Protobranchia, Yoldiidae) from Haima Cold Seep, South China Sea, China.

In present study, a previously unidentified but frequently encountered species of deep-sea protobranch, Yoldiellahaimaensis sp. nov., is described new to science from the Haima Cold Seep on the northwestern slope of the South China Sea. A morphological analysis confirmed that this species belongs to a previously undescribed species of the genus Yoldiella A.E. Verrill & K.J. Bush, 1897. It differs morphologically from other known species within the genus in its shell shape, degree of inflation, beaks, and number of hinge teeth. Furthermore, we sequenced three gene segments of Y.haimaensis sp. nov., comprising a nuclear ribosomal gene (18S rRNA), a nuclear protein-coding gene (histone H3), and a mitochondrial gene (cytochrome c oxidase subunit I, COI). Our phylogenetic analysis performed on the superfamily Nuculanoidea and family Yoldiidae indicates that the genus Yoldiella is non-monophyletic, and the widely recognized families within the superfamily Nuculanoidea are also not monophyletic. Our results provide molecular insights into the Protobranchia and highlight the necessity for further samples and data to revise the classification of families and genera within the superfamily using an integrative approach that combines morphological analysis and molecular data.

Dietary inflammatory index and number of functional teeth in middle-aged and older Japanese adults: A cross-sectional study using national survey data.

To determine whether the number of functional teeth, including the remaining natural teeth and prosthetically restored missing teeth, is associated with the dietary inflammatory index (DII), a quantitative measure of the inflammatory potential of the overall diet, in middle-aged and older Japanese adults. National survey data from a non-institutionalized Japanese population aged ≥45 years was analyzed. Multivariable linear regression analyses were performed to assess the association between the DII score, which was calculated based on dietary records, and the number of functional teeth, which was determined during dental examination. All regression analyses were stratified according to the age groups 45-64, 65-74, and ≥75 years. The association between functional tooth units (FTUs) and the DII was assessed using sensitivity analysis. In total, 2407 individuals (1053 men and 1354 women; mean age = 66.7 years) were included. Multivariable analysis revealed that the number of functional teeth was significantly inversely associated with the DII score among participants aged ≥75 years (regression coefficient per increase of one in the number of functional teeth = -0.050; 95% confidence interval = -0.089 to -0.010). The number of functional teeth was not associated with the DII score in younger age categories (i.e., those aged 45-74 years). As in the primary analysis, the number of FTUs was significantly inversely associated with the DII score only in the group aged ≥75 years. A greater number of functional teeth was associated with a lower DII (i.e., diet with greater anti-inflammatory potential) in Japanese adults aged ≥75 years.

Parameter Selection for Milling Machining of Thin-Walled Parts Based on Spatial Distribution of Side Blades

In the machining of thin-walled components, the tool’s side edges play a pivotal role in the cutting process. This paper presents the establishment of the AdvantEdge 3D simulation model for the analysis of the contact conditions and the variation in cutting forces between the side edge and the machined surface across varying cutting depths. Subsequently, milling experiments were conducted to assess the impact of the side edge’s contact conditions on the surface quality of the machined parts, considering different cutting depths. The findings reveal that during side milling of thin-walled components, a lower number of teeth result in reduced cutting edges, decreased cutting forces, and improved surface quality. The selection of cutting depth should be made with due consideration to the contact conditions between the tool’s side edge and the workpiece. Ideally, the cutting depth should be less than the pitch of the side edge’s spatial curve to ensure that only a single cutting edge is engaged in the cutting process.

Evaluating smile aesthetic satisfaction and related smile characteristics in dental students

AimThis study aimed to assess the association between self-rated smile satisfaction and the smile dimensions among dental students. MethodAn analytical cross-sectional study was conducted on 216 Vietnamese dental students. A standardized photograph was taken of each student with their frontal social smiles to assess aesthetic dimensions. A single-session self-administered questionnaire containing five questions about smile aesthetic satisfaction related to various aspects was administered to all students. Differences in smile characteristics and satisfaction scores between the two genders were evaluated. The impact of smile characteristics on satisfaction scores was assessed using multiple linear regression models. ResultsMost dental students had a high smile line, parallel smile arcs, an upward upper lip curvature, a non-touching labiodental relationship, a dental midline that coincided with the midline of the face, and eight teeth displayed during smile. Most participants were satisfied with their smiles, and the self-rated satisfaction score was 67 out of 100. Self-perceived overall smile satisfaction was associated with the "smile arc”, the "upper lip curvature”, the "number of teeth displayed during smile”, and the "dental midline”. Female students had a statistically significant correlation between self-perception and smile characteristics, such as upper lip curvature, dental midline shift, and smile line. ConclusionsThe smile arc, upper lip curvature, and dental midline shift affected self-perceived satisfaction among dental students. Female students showed an association between the smile parameters and self-perceived satisfaction.

New species of Pseudacanthicus (Siluriformes: Loricariidae) from the rio Xingu, Amazon, Brazil

Abstract The genus Pseudacanthicus encompasses eight recognized species so far: P. histrix, P. serratus, P. spinosus, P. fordii, P. leopardus, P. pitanga, P. pirarara, P. major. Only P. pirarara has been formally described from the rio Xingu basin. To address this gap in taxonomic knowledge of the region, a new species of the Pseudacanthicus is described here, aimed at enhancing our understanding of the genus within the rio Xingu basin and contributing to conservation efforts. The new species is primarily found downstream the impact zone of the Belo Monte Hydroelectric Power Plant. It can be promptly diagnosed from congeners by the color pattern of the body dark brown to black with light gray vermicular spots on the dorsal and ventral surfaces, and fins; lower maximum number of teeth in premaxilla and dentary; and other osteological characters. It’s worth noting that the ichthyofauna of the Amazonian drainages lacks comprehensive taxonomic and biological information regarding Pseudacanthicus. In this context, unchecked anthropogenic activities are leading to changes in the ecosystem, often resulting in the extinction of species even before they are scientifically addressed.

Self-Reported Oral Diseases and Their Association with the Frailty index among Older Japanese People: Four-Year Follow-Up.

Oral health is a relevant component for overall health. Oral disease onset at an early age and may harm several health dimensions, especially among older people, and has been associated with frailty. To evaluate associations between the Frailty Index (FI) and self-reported oral diseases among older, community-dwelling Japanese people. Cross-sectional and prospective analyses were performed. We analyzed data from 2,529 participants at the baseline and four-year follow-up of the Nihon University Japanese Longitudinal Study of Aging, which had a four-year follow-up. We used the self-reported number of teeth, self-reported satisfaction with dentures, and self-reported ability to chew hard food as independent variables. We computed an FI that included 40 deficits as the dependent variable. The FI score ranged from 0 to 1, with a higher score associated with adverse health outcomes and mortality. Considering a gamma distribution and controlling for age, gender, marital status, education, working status, and residence area, we fitted generalized linear models. We found that dissatisfied denture users had a 2.1% (95% CI 1.006-3.279) higher frailty score than non-denture users at the baseline and a 2.1% (95% CI 0.629-3.690) higher frailty score than non-denture users at the four-year follow-up. In the cross-sectional analysis, with each additional reported tooth at the baseline, the FI score was lower by 1.5% (95% CI -2.878 to -0.208) at the four-year follow-up. In both the cross-sectional and the prospective analyses, the FI scores increased as the ability to chew hard food decreased. Self-reported oral diseases are associated with the FI score cross-sectionally and prospectively. Identifying factors prospectively associated with frailty may improve strategies for the next generation of older people. Considering oral diseases may help clinicians personalize treatment plans for older people.

Optimization of forensic identification through 3-dimensional imaging analysis of labial tooth surface using open-source software.

The objective of this study was to determine the minimum number of teeth in the anterior dental arch that would yield accurate results for individual identification in forensic contexts. The study involved the analysis of 28 sets of 3-dimensional (3D) point cloud data, focused on the labial surface of the anterior teeth. These datasets were superimposed within each group in both genuine and imposter pairs. Group A incorporated data from the right to the left central incisor, group B from the right to the left lateral incisor, and group C from the right to the left canine. A comprehensive analysis was conducted, including the evaluation of root mean square error (RMSE) values and the distances resulting from the superimposition of dental arch segments. All analyses were conducted using CloudCompare version 2.12.4 (Telecom ParisTech and R&D, Kyiv, Ukraine). The distances between genuine pairs in groups A, B, and C displayed an average range of 0.153 to 0.184 mm. In contrast, distances for imposter pairs ranged from 0.338 to 0.522 mm. RMSE values for genuine pairs showed an average range of 0.166 to 0.177, whereas those for imposter pairs ranged from 0.424 to 0.638. A statistically significant difference was observed between the distances of genuine and imposter pairs (P<0.05). The exceptional performance observed for the labial surfaces of anterior teeth underscores their potential as a dependable criterion for accurate 3D dental identification. This was achieved by assessing a minimum of 4 teeth.

The Potential Association Between Inflammatory Bowel Diseases and Apical Periodontitis: A Systematic Review and Meta-Analysis.

Recent literature has suggested a potential association between inflammatory bowel diseases (IBD) and apical periodontitis (AP). The present systematic review and meta-analysis sought to analyse and appraise the available evidence regarding the reported association. Following 2020 PRISMA guidelines, a comprehensive search of multiple online databases (PubMed, Scopus, Web of Science, and Google Scholar) was conducted for all relevant studies published from the date of inception until 27 April 2023 using various relevant keywords. All observational studies that assessed the association between IBD and AP in humans were eligible for inclusion. The quality of the selected studies was carried out independently by two reviewers, and meta-analysis was performed using Comprehensive Meta-Analysis Version 2.2.064. Six studies (five case-control studies and one cohort study) were included. A total of 657 patients (277 with IBD) were included in 5 case-control studies, and 48,223 subjects (35,740 with AP) were included in the cohort study, where 188 developed IBD on follow-up. The pooled data from the five case-control studies revealed that IBD was significantly associated with a higher risk of AP (OR=1.71, 95% CI: 1.21-2.42; I2=10.337%, fixed-effect, p=0.002). The qualitative analysis also showed that most of the included studies found a higher mean number of teeth with AP in IBD groups than the healthy controls. Newcastle-Ottawa Scale (NOS)-based quality appraisal results demonstrated that five studies were of high quality, and one was of moderate quality. The results suggest a potential association between IBD and AP. Large-scale and prospective studies are required to further confirm and elucidate the nature of such an association.

Real-time dynamic navigation way forward to restoring smiles

ABSTRACT This case report describes the “Fast and Fixed” dental implant procedure, used to replace failing dentition with a fixed prosthesis that is supported by only four dental implants in each arch. This immediate loading protocol is designed to provide a more stable and permanent solution for individuals who have lost a significant number of teeth or are facing complete tooth loss. Dynamic navigation involves using computer-guided technology to plan and execute dental implant surgery in real time. In the context of a full-mouth implant restoration, dynamic navigation helps the surgeon to precisely determine the optimal prosthetic driven locations of the dental implants. This technology not only improves accuracy, reduces the risk of errors, but can contribute to better treatment outcomes in challenging cases of full-mouth implant-based rehabilitation.

Classification of presence of missing teeth in each quadrant using deep learning artificial intelligence on panoramic radiographs of pediatric patients.

Early tooth loss in pediatric patients can lead to various complications, making quick and accurate diagnosis essential. This study aimed to develop a novel deep learning model for classification of missing teeth on panoramic radiographs in pediatric patients and to assess the accuracy. The study included patients aged 8-16 years who visited the Pusan National University Dental Hospital and underwent panoramic radiography. A total of 806 panoramic radiographs were retrospectively analyzed to determine the presence or absence of missing teeth for each tooth number. Moreover, each panoramic radiograph was divided into four quadrants, each of a smaller size, containing both primary and permanent teeth, generating 3224 data. Quadrants with missing teeth (n = 1457) were set as the experimental group, and quadrants without missing teeth (n = 1767) were set as the control group. The data were split into training and validation sets in a 4:1 ratio, and a 5-fold cross-validation was conducted. A gradient-weighted class activation map was used to visualize the deep learning model. The average values of sensitivity, specificity, accuracy, precision, recall and F1-score of this deep learning model were 0.635, 0.814, 0.738, 0.730, 0.732 and 0.731, respectively. In the experimental group, the accuracy was the highest for missing canines and premolars, and the lowest for molars. The deep learning model exhibited a moderate to good distinguishing power with a classification performance of 0.730. This deep learning model and the newly defined small sized region of interest proved adequate for classifying the presence of missing teeth.

Current concepts regarding tooth numbering systems in dentistry: Challenges faced and future prospects.

Current concepts regarding tooth numbering systems in dentistry: Challenges faced and future prospects.