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Scientific Reports Mar 2019The aim of this study was to investigate the fracture behaviour of fissural dental enamel under simulated occlusal load in relation to various interacting factors...
The aim of this study was to investigate the fracture behaviour of fissural dental enamel under simulated occlusal load in relation to various interacting factors including fissure morphology, cuspal angle and the underlying material properties of enamel. Extended finite element method (XFEM) was adopted here to analyse the fracture load and crack length in tooth models with different cusp angles (ranging from 50° to 70° in 2.5° intervals), fissural morphologies (namely U shape, V shape, IK shape, I shape and Inverted-Y shape) and enamel material properties (constant versus graded). The analysis results showed that fissures with larger curved morphology, such as U shape and IK shape, exhibit higher resistance to fracture under simulated occlusal load irrespective of cusp angle and enamel properties. Increased cusp angle (i.e. lower cusp steepness), also significantly enhanced the fracture resistance of fissural enamel, particularly for the IK and Inverted-Y shape fissures. Overall, the outcomes of this study explain how the interplay of compositional and structural features of enamel in the fissural area contribute to the resistance of the human tooth against masticatory forces. These findings may provide significant indicators for clinicians and technicians in designing/fabricating extra-coronal dental restorations and correcting the cuspal inclinations and contacts during clinical occlusal adjustment.
Topics: Bite Force; Composite Resins; Computer Simulation; Dental Enamel; Dental Fissures; Dental Restoration, Permanent; Finite Element Analysis; Fracture Fixation; Humans; Molar; Stress, Mechanical; Surface Properties
PubMed: 30886223
DOI: 10.1038/s41598-019-41304-z -
BioMed Research International 2021The function of the masticatory apparatus is complete when the dentition is intact with contact between the individual teeth and proper occlusion with the antagonists....
INTRODUCTION
The function of the masticatory apparatus is complete when the dentition is intact with contact between the individual teeth and proper occlusion with the antagonists. For years, occlusal contacts have been studied to determine their exact location and describing various materials and methods for their registration such as paper foil, silk, and Shimstock foil. For years, occlusal contacts have been studied to determine their exact location and describe various materials and methods for their registration such as paper foil, silk, shim stock foil, the T-Scan system, and more recently the OccluSense system. The primary aim of the study was at evaluating which of the occlusal indicators is the most commonly used in practice, and the secondary aim was whether dentists are willing to use digital methods to examine occlusion.
MATERIALS AND METHODS
The main primary information of the survey was collected by sending electronically anonymous questionnaires to 2014 dentists, randomly selected from all regions of the country. 228 questionnaires were filled in and returned. To achieve the goal of the study, the self-developed questionnaire was created and tested to survey the opinion about the use of occlusal indicators in dental practice. Each questionnaire contains questions about the sociodemographic and professional status of the people in the group and their opinion about the positives and negatives and the effectiveness of occlusal indicators.
RESULTS
The obtained results confirm the statement that the most frequently used occlusal indicator in dental practice is the articulation paper. Articulation foil and silk are used less frequently than articulation paper. Of the listed quality indicators, Shimstock foil is rarely used in practice. Of the indicated quantitative indicators, the T-Scan system is more used than the OccluSense system. In the era of rapid technology development, the opinion and desire of dentists to increasingly want to introduce in their clinical practice quantitative methods are the digital diagnosis of occlusion.
CONCLUSION
In any dental practice, if technically possible, digital methods would be used, giving more accurate and reliable data on the registered occlusal contacts.
Topics: Adult; Aged; Attitude; Bulgaria; Dental Occlusion; Dentistry; Dentists; Diagnostic Tests, Routine; Female; Humans; Indicators and Reagents; Jaw Relation Record; Male; Malocclusion; Middle Aged; Motivation; Occlusal Adjustment; Surveys and Questionnaires
PubMed: 34778449
DOI: 10.1155/2021/2177385 -
Healthcare (Basel, Switzerland) Oct 2022The clinical remount is an accurate and efficient way to reset the occlusion of delivered removable dentures if major occlusal correction is required. Although previous...
The clinical remount is an accurate and efficient way to reset the occlusion of delivered removable dentures if major occlusal correction is required. Although previous studies have reported that clinical remounting of existing dentures enhances patients' oral function, little subjective feedback is available. This retrospective study reports short-term changes in oral-health-related quality of life (OHRQoL) and masticatory function after clinical remounting of existing dentures. Three time points were defined: before adjustment (T0), immediately after adjustment (T1), and 1 week after adjustment (T2). The medical records of seven patients were analyzed. The mean age of participants was 77.71 years, and the mean service period of their prostheses was 9.43 months. The mean scores of the OHIP-EDENT-J questionnaire at the respective time points were 35, 21.14, and 22.14. The mean readings of masticatory function at the respective time points were 76.71, 89.29, and 111.86. Significant differences in the OHIP-EDENT-J were found between T0 and T1, and T0 and T2; and in masticatory function between T1 and T2, and T0 and T2. The results indicated that after rebalancing of the occlusion of the existing dentures, the patient-reported OHRQoL was improved immediately and maintained at least for a short time, and masticatory function was enhanced over a 1-week period.
PubMed: 36292407
DOI: 10.3390/healthcare10101960 -
Journal (Canadian Dental Association) 2012As implant treatment becomes part of mainstream dental therapy, dental offices should implement protocols for individualized, systematic and continuous supportive care... (Review)
Review
As implant treatment becomes part of mainstream dental therapy, dental offices should implement protocols for individualized, systematic and continuous supportive care of the peri-implant tissues. This review article suggests guidelines for maintenance care of dental implants. The preliminary assessment should begin with updating the patient's medical and dental histories. The clinical implant should be examined to evaluate the following: condition of the soft tissues, plaque index, clinical probing depth, bleeding on probing, suppuration, stability of soft-tissue margins, keratinized tissue, mobility and occlusion. If the clinical signs suggest the presence of peri-implantitis, radiography of the site is advisable, to confirm the diagnosis. Appropriate treatment should be pursued according to any diagnosis reached during the examination, including (but not limited to) instructions on oral hygiene, removal of supra- and sub-gingival plaque and calculus, occlusal adjustment, relining of a removable prosthesis or surgery.
Topics: Clinical Protocols; Dental Care; Dental Implants; Dental Plaque Index; Humans; Medical History Taking; Peri-Implantitis; Periodontal Diseases; Periodontal Index
PubMed: 23306040
DOI: No ID Found -
The Japanese Dental Science Review Nov 2020The purpose of the present review was to survey the available literature on computer-aided design/computer-aided manufacturing (CAD/CAM)-produced resin composite... (Review)
Review
The purpose of the present review was to survey the available literature on computer-aided design/computer-aided manufacturing (CAD/CAM)-produced resin composite materials to provide clinicians with a current overview of the key components necessary for daily clinical use. An electronic search was conducted in the PubMed database. Peer-reviewed articles in English language on the use of resin composites in CAD/CAM dental crowns were included. A total of 122 full-text articles were identified, 15 of which were selected during the initial review. Two additional articles were also discovered through a manual search, to obtain a final total of 17 articles included in the present review. Of these, 16 were to studies, and one was an study. Findings from the studies indicate that resin composite block materials for CAD/CAM applications demonstrate excellent physical properties and are appropriate for the clinical restoration of premolars and molars. However, the study reported a low 3-year success rate, but high survival rate for resin composite CAD/CAM crowns placed in the premolar region. The key to ensuring the successful prognosis of a resin composite CAD/CAM crown is to ensure that all steps-such as proper case selection, abutment tooth preparation, occlusal adjustment, and bonding-are accurately performed.
PubMed: 33299502
DOI: 10.1016/j.jdsr.2020.10.002 -
MedEdPORTAL : the Journal of Teaching... Sep 2016The concept of occlusal therapy as an aspect of overall patient care can be difficult for a dental student to grasp. A clear understanding of the position of the teeth,...
INTRODUCTION
The concept of occlusal therapy as an aspect of overall patient care can be difficult for a dental student to grasp. A clear understanding of the position of the teeth, temporomandibular joints, and articulator components is necessary as the position of the teeth and condyles moves from centric relation to maximum intercuspation.
METHODS
This slide-show presentation, self-assessment rubric, and instructor guide were created to enhance student understanding of occlusal concepts. Peter Dawson's occlusal concept of mutually protected occlusion is demonstrated as duplicated casts are adjusted to make centric relations and maximum intercuspation equal.
RESULTS
This educational resource has been utilized for the past 2 years at our dental school as part of the preclinical occlusion course. It has also been used in the dental clinic for third- and fourth-year students as the need arises for occlusal adjustment on a patient. While we have no hard data on the number of times it has been utilized, the feedback from faculty and students has been positive. The students are consistently able to utilize the educational resource to guide them through the steps of performing a diagnostic occlusal adjustment to the satisfaction of the proctoring faculty.
DISCUSSION
Existing articles and textbooks mention all of the concepts and steps seen in this resource, but the limitation of print media results in minimization and consolidation of these concepts and steps. This resource presents the detail that is lacking in textbooks.
PubMed: 31008243
DOI: 10.15766/mep_2374-8265.10465 -
Case Reports in Dentistry 2022In this study, we have introduced a case in which the effective blood oxygenation level-dependent signal on functional magnetic resonance imaging (fMRI) was altered by...
OBJECTIVE
In this study, we have introduced a case in which the effective blood oxygenation level-dependent signal on functional magnetic resonance imaging (fMRI) was altered by the improvement of periodontal tissue and occlusal function in a patient with periodontitis Stage II Grade B. . A 61-year-old female patient requiring periodontal treatment was diagnosed as having periodontitis Stage II Grade B via clinical and radiographic examinations. Her past medical history included type 2 diabetes, hypertension, and hyperlipidemia. Following the patient's informed written consent, the periodontal initial treatment provided to the patient included tooth brushing instruction and scaling and root planing; however, occlusal adjustment was not performed at this stage. Occlusal force and fMRI results were also evaluated at the initial and reevaluation examinations.
RESULTS
After the periodontal initial treatment had been performed, it was noted that the patient's periodontal tissue and occlusal force had improved. It was also evident from fMRI that cerebral blood flow had been activated in the insula, primary motor cortex, and premotor cortex.
CONCLUSION
This result suggested that the periodontal ligament had recovered and the periodontal ligament neuron had been further subjected to clenching in the insula so that the muscle spindle sensation impacted the motor cortex.
PubMed: 35527723
DOI: 10.1155/2022/5383893 -
Head & Face Medicine Mar 2010Many researchers have not accepted the use of occlusal treatments for temporomandibular disorders (TMDs). However, a recent report described a discrepancy between the...
BACKGROUND
Many researchers have not accepted the use of occlusal treatments for temporomandibular disorders (TMDs). However, a recent report described a discrepancy between the habitual occlusal position (HOP) and the bite plate-induced occlusal position (BPOP) and discussed the relation of this discrepancy to TMD. Therefore, the treatment outcome of evidence-based occlusal adjustments using the bite plate-induced occlusal position (BPOP) as a muscular reference position should be evaluated in patients with TMD.
METHODS
The BPOP was defined as the position at which a patient voluntarily closed his or her mouth while sitting in an upright posture after wearing an anterior flat bite plate for 5 minutes and then removing the plate. Twenty-one patients with TMDs underwent occlusal adjustment using the BPOP. The occlusal adjustments were continued until bilateral occlusal contacts were obtained in the BPOP. The treatment outcomes were evaluated using the subjective dysfunction index (SDI) and the Helkimo Clinical Dysfunction Index (CDI) before and after the occlusal adjustments; the changes in these two indices between the first examination and a one-year follow-up examination were then analyzed. In addition, the difference between the HOP and the BPOP was three-dimensionally measured before and after the treatment.
RESULTS
The percentage of symptom-free patients after treatment was 86% according to the SDI and 76% according to the CDI. The changes in the two indices after treatment were significant (p < 0.001). The changes in the mean HOP-BPOP differences on the x-axis (mediolateral) and the y-axis (anteroposterior) were significant (p < 0.05), whereas the change on the z-axis (superoinferior) was not significant (p > 0.1).
CONCLUSION
Although the results of the present study should be confirmed in other studies, a randomized clinical trial examining occlusal adjustments using the BPOP as a reference position appears to be warranted.
Topics: Adolescent; Adult; Aged; Dental Impression Materials; Female; Humans; Jaw Relation Record; Male; Middle Aged; Occlusal Adjustment; Occlusal Splints; Polyvinyls; Siloxanes; Temporomandibular Joint Disorders; Young Adult
PubMed: 20346167
DOI: 10.1186/1746-160X-6-5 -
Computational and Mathematical Methods... 2021Based on deep learning, the characteristics of food impaction with tight proximal contacts were studied to guide the subsequent clinical treatment of occlusal...
OBJECTIVE
Based on deep learning, the characteristics of food impaction with tight proximal contacts were studied to guide the subsequent clinical treatment of occlusal adjustment. At the same time, digital model building, software measurement, and statistical correlation analysis were used to explore the cause of tooth impaction and to provide evidence for clinical treatment.
METHODS
Volunteers with ( = 250) and without ( = 250) tooth impaction were recruited, respectively, to conduct a questionnaire survey. Meanwhile, models were made and perfused by skilled clinical physicians for these patients, and characteristics such as adjacent line length, adjacent surface area, tongue abduction gap angle, buccal abduction gap angle, and occlusal abduction gap angle were measured. A normality test, differential analysis, correlation analysis of pathological characteristics of the impaction group, principal component analysis (PCA), and binary logistic regression analysis were performed.
RESULTS
The adjacent line length, adjacent surface area, tongue abduction gap angle, buccal abduction gap angle, and occlusal abduction gap angle all met normal distribution. There were statistically significant differences in adjacent line length ( < 0.001), adjacent surface area ( < 0.001), and occlusal abduction gap angle ( < 0.001) between the two groups. After dimensionality reduction by PCA on characteristics, adjacent line length, adjacent surface area, buccal abduction gap angle, and occlusal abduction gap angle had a strong correlation with the principal components. Binary logistic regression analysis showed that adjacent line length and adjacent surface area had positive effects on impaction. The buccal abduction gap angle and occlusal abduction gap angle had a significant negative influence on impaction.
CONCLUSION
Adjacent line length, adjacent surface area, buccal abduction gap angle, and occlusal abduction gap angle are independent factors influencing food impaction.
Topics: Adult; Computational Biology; Deep Learning; Dental Occlusion; Food; Humans; Imaging, Three-Dimensional; Mastication; Middle Aged; Models, Dental; Occlusal Adjustment; Tooth Diseases
PubMed: 34777558
DOI: 10.1155/2021/1000820 -
Revista Cientifica Odontologica... 2022The aim of optimal dentistry is to stabilise the stomatognathic system (teeth, periodontium, muscles and temporomandibular joint). All of these must work in harmony, as...
The aim of optimal dentistry is to stabilise the stomatognathic system (teeth, periodontium, muscles and temporomandibular joint). All of these must work in harmony, as together they provide optimal care from diagnosis through planning to treatment. However, many clinicians currently give little importance to the identification of premature contacts and/or interferences prior to any dental treatment, which should be taken into account to provide improved stability in mandibular closure, correct anterior and canine guidance in mandibular movements.This clinical case describes the treatment of a patient with a diagnosis of functional occlusal disorder due to premature contact, whose treatment consisted of an occlusal adjustment by selective wear, following the technique described by the author Klineberg, with the aim of preserving the dental structure as much as possible while maintaining control during the occlusal adjustment and returning the greatest number of symmetrical and pointed contacts.
PubMed: 38389550
DOI: 10.21142/2523-2754-1003-2022-122