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1.
Int. j interdiscip. dent. (Print) ; 14(2): 131-134, ago. 2021. tab, ilus
Article in English | LILACS | ID: biblio-1385200

ABSTRACT

ABSTRACT: Abfractions (AFs) are non-carious cervical lesions considered of multifactorial etiology by several authors. Objective: Relate the presence of premature contacts and AFs. Materials & Methods: The original number of students to be analyzed were 117, 36 of whom (equal amount of women and men) were finally chosen for presenting premature contacts. 19 of them presented abfractions. A survey was conducted with questions on issues like toothbrushing habits, diet and some gastric disorders; besides the participants had to take the Hamilton Anxiety Rating Scale. Then, stone models were obtained and mounted for further occlusal analysis with WCM ® semi-adjustable articulator searching the abfractions and their coincidence with premature contacts. Fisher's exact test (p<0,05) was used to associate AF with toothbrushing habits, diet, burning symptoms and gastroesophageal reflux. Chi-square test (p<0,05) was used to associate AFs and premature contacts. Student's t-distribution was used to associate AFs with anxiety. Results: There was a significant relationship between AFs presence and premature contacts (p=0,00). There was not a significant relationship between presence of AFs and toothbrushing habits and diet. There was not a significant relationship between presence of AFs and anxiety. Conclusions: AF presence do associate with premature contacts in the same affected tooth.


Subject(s)
Humans , Male , Female , Young Adult , Tooth Cervix/pathology , Dental Occlusion , Tooth Erosion , Bite Force , Cross-Sectional Studies , Tooth Wear
2.
Chinese Journal of Tissue Engineering Research ; (53): 3594-3601, 2020.
Article in Chinese | WPRIM | ID: wpr-847714

ABSTRACT

BACKGROUND: The development of digital technology has changed the diagnosis and treatment process in traditional oral clinic. The digital workflow can improve patient’s comfort, and save time. Virtual articulator as the new development section has been used in most of the dental design software, which is to replicate the function of mechanical articulator and simulate static and dynamic occlusion. It makes treatment more convenient, accuract and efficient. OBJECTIVE: To review the recent progress in the field of operation and clinical application of multiple virtual articulators at home and abroad. METHODS: The first author searched the related literature, clinical cases and books by computer in domestic and foreign databases, and the related contents and opinions were summarized. RESULTS AND CONCLUSION: (1) Although it has been studied for about 20 years, virtual articulator has not been widely applied because of technical sensitivity and high cost. (2) The transfer of articulator needs to scan the mandible model and record the mandibular movement relation. To define mandibular movement relation, average mandible parameters can be used, the ultrasonic sensor, photoelectric sensor, digital face bow or cone beam computed tomography for individualized records can also be used. (3) At present, virtual articulator has been used in fields of orthognathic surgery, temporomandibular joint disease, implant, and aesthetic repair. Comparative studies have shown that accuracy can meet clinical requirements and save time. However, differences between occlusal systems need to be detected. (4) Virtual articulator can save clinical operation time, improve accuracy, make up for the limitations of mechanical articulator, and has a wide range of application prospects.

3.
West China Journal of Stomatology ; (6): 30-36, 2020.
Article in Chinese | WPRIM | ID: wpr-781349

ABSTRACT

OBJECTIVE@#This study aims to investigate the occlusal and myoelectric characteristics of implant-supported fixed denture in the mandibular region and provide reference for the design of fixed restoration.@*METHODS@#Sixty edentulous patients with implant-supported fixed denture were selected and divided into three groups: group A, 20 cases with implant-supported fixed restoration in the maxillary region; group B, 20 cases with natural dentition, and group C, 20 cases with removable partial denture. The T-scan 8.0 digital occlusion analysis system was used to evaluate the occlusal characteristics of patients in the three groups at intercuspal, protrusion, and left and right lateral positions. Electromyography was used to analyze the myoelectric amplitude and bilateral asymmetry index of the anterior temporalis and masseter of the three groups in different states such as resting and clenching. The relationship between occlusion and myoelectricity was also investigated.@*RESULTS@#In the occlusion analysis by T-scan, the occlusion time, the balance of left and right bite force, the left and right asymmetry of the occlusion center, the trajectory of central occlusion force, and the disclusion time were higher in group C than in groups A and B (P<0.05). No significant differences were observed in the anterior and posterior asymmetry of the occlusion center and percentage of bite force at anterior region among the three groups. In the analysis of myoelectricity, the myoelectric amplitude at resting state and the asymmetry index of masticatory muscles in group C were higher than those in groups A and B (P<0.05). The myoelectric amplitude during clenching in groups A and B groups was higher than that in group C (P<0.05).@*CONCLUSIONS@#In implant-supported fixed restoration at edentulous mandibular, when maxillary includes the removable partial denture, degree of occlusal instability and left and right asymmetry of occlusion center are greater than those with the natural dentition and implant-supported fixed denture at maxillary. The myoelectricity is closely related to occlusion. The removable partial denture can increase the myoelectric activity and reduce the potential of the masticatory muscle. The asymmetry of bilateral myoelectricity is related to the occlusion imbalance.


Subject(s)
Humans , Bite Force , Dental Implants , Dental Prosthesis, Implant-Supported , Mandible , Masticatory Muscles
4.
West China Journal of Stomatology ; (6): 628-632, 2018.
Article in Chinese | WPRIM | ID: wpr-772446

ABSTRACT

OBJECTIVE@#This study aims to evaluate the occlusal characteristics of full edentulous patients with implant-supported prostheses and to provide a reference with the occlusal situation for clinicians.@*METHODS@#A Teetester occlusal analysis system was used with 30 full edentulous patients of implant-supported fixed denture (test group) in comparison with 30 natural dentition (control group). The percentage of occlusal force distribution were measured, as well as the occlusal time at the intercuspal, protrusion, and left and right lateral positions.@*RESULTS@#Compared with control group, the occlusion time, maximum occlusal force in intercuspal of test group significantly reduced (P<0.05); while control group was obviously superior to test group in the left and right bit force degree. Disclusion time in protrusion, occlusion times in lateral positions of test group also significantly reduced (P<0.05). There were no significant differences in average occlusion force, percentage of total force in anterior teeth, and lateral occlusion between test group and control group.@*CONCLUSIONS@#The maximum occlusal force in intercuspal of full edentulous patients with implant-supported prostheses reduce. The occlusal force in protrusive occlusion is concentrated in the front teeth, and the group function occlusion is the main lateral occlusal pattern.


Subject(s)
Humans , Bite Force , Dental Occlusion , Dental Prosthesis, Implant-Supported , Dentures , Malocclusion , Mouth, Edentulous
5.
Article in Spanish | LILACS | ID: lil-794502

ABSTRACT

El objetivo de esta revisión bibliográfica es describir y comprender cómo funciona la medición y el registro digital de las fuerzas oclusales a través del transductor intraoral del sistema T-Scan® III. Analizar la exactitud, confiabilidad del dispositivo y resultados de estudios recientes que utilizan este sistema digital de registro oclusal, sus indicaciones y aplicación clínica en el análisis de las relaciones dentarias en oclusión antes y después de tratamientos de rehabilitación oral, donde el balance de las fuerzas oclusales es fundamental para el éxito en el largo plazo. El método utilizado consistió en una revisión no sistemática en la base de datos PubMed. Se encontraron 10 artículos que cumplían los criterios de inclusión. Luego de revisar la literatura se puede concluir que el método de análisis oclusal con T-Scan® III es apropiado como dispositivo de diagnóstico oclusal y medición de fuerzas oclusales relativas, tanto en posiciones estáticas como en dinámica mandibular. Existe solo un estudio que indica que es más exacto que los registros existentes de papel marcador. Sin embargo, faltan más estudios tipo ensayos clínicos y/o experimentales para tener mayor certeza de su incorporación a la práctica clínica habitual en rehabilitación oral.


The aim of this review is to describe and understand how the occlusal forces are measured and recorded using an intraoral transducer system, T-Scan® III. An analysis was made of the accuracy and reliability of the device, using the results of recent studies found in the PubMed database using the digital method of recording occlusal indications and clinical application in the analysis of the relationships of the teeth in occlusions before and after oral rehabilitation treatments, where the balance of occlusal forces is essential for long-term success. The method used consisted of a non-systematic review in PubMed. Ten articles were found that met the inclusion criteria. After reviewing the literature, it can be concluded that the method of occlusal analysis with T-Scan® III is suitable as a diagnostic device for measuring relative occlusal forces in both static and dynamic jaw positions. There is only one study that indicates that it is more accurate than paper recordings. However, more clinical and/or experimental studied are required for greater certainty of its incorporation into routine clinical practice in oral rehabilitation.


Subject(s)
Humans , Bite Force , Signal Processing, Computer-Assisted , Dental Occlusion , Software , Mouth Rehabilitation
6.
Article in English | IMSEAR | ID: sea-145792

ABSTRACT

Aims: The aim of this study was to evaluate the effect of temporary hydrostatic splint on occlusion with computerized occlusal analysis system. Material and Methods: Maximal bite force was recorded in intercuspal position by use of computerized occlusal analysis system from 11 female, 9 male, 20 subjects, (average age of 20) with normal intact dentitions. Subjects were instructed to use the hydrostatic splint for 24 h. Occlusal records were repeated three times before and after splint. All recordings were evaluated to determine the repeatability of the computerized occlusal analysis system. Results and Conclusion: Hydrostatic splint increased maximum biting force. Relative percentage of left and right bite forces changed in the direction of neurophysiological position of the muscles. Hydrostatic splint can be a viable option for occlusal adjustments.


Subject(s)
Dental Occlusion/instrumentation , Dental Occlusion/methods , Female , Humans , Image Processing, Computer-Assisted , Male , Occlusal Adjustment , Occlusal Splints/statistics & numerical data , Young Adult
7.
The Journal of Advanced Prosthodontics ; : 7-12, 2012.
Article in English | WPRIM | ID: wpr-141485

ABSTRACT

PURPOSE: Articulation paper mark size is widely accepted as an indicator of forceful tooth contacts. However, mark size is indicative of contact location and surface area only, and does not quantify occlusal force. The purpose of this study is to determine if a relationship exists between the size of paper marks and the percentage of force applied to the same tooth. MATERIALS AND METHODS: Thirty dentate female subjects intercuspated into articulation paper strips to mark occlusal contacts on their maxillary posterior teeth, followed by taking photographs. Then each subject made a multi-bite digital occlusal force percentage recording. The surface area of the largest and darkest articulation paper mark (n = 240 marks) in each quadrant (n = 60 quadrants) was calculated in photographic pixels, and compared with the force percentage present on the same tooth. RESULTS: Regression analysis shows a bi-variant fit of force % on tooth (P<.05). The correlation coefficient between the mark area and the percentage of force indicated a low positive correlation. The coefficient of determination showed a low causative relationship between mark area and force (r2 = 0.067). The largest paper mark in each quadrant was matched with the most forceful tooth in that same quadrant only 38.3% of time. Only 6 2/3% of mark surface area could be explained by applied occlusal force, while most of the mark area results from other factors unrelated to the applied occlusal force. CONCLUSION: The findings of this study indicate that size of articulation paper mark is an unreliable indicator of applied occlusal force, to guide treatment occlusal adjustments.


Subject(s)
Female , Humans , Bite Force , Occlusal Adjustment , Tooth
8.
The Journal of Advanced Prosthodontics ; : 7-12, 2012.
Article in English | WPRIM | ID: wpr-141484

ABSTRACT

PURPOSE: Articulation paper mark size is widely accepted as an indicator of forceful tooth contacts. However, mark size is indicative of contact location and surface area only, and does not quantify occlusal force. The purpose of this study is to determine if a relationship exists between the size of paper marks and the percentage of force applied to the same tooth. MATERIALS AND METHODS: Thirty dentate female subjects intercuspated into articulation paper strips to mark occlusal contacts on their maxillary posterior teeth, followed by taking photographs. Then each subject made a multi-bite digital occlusal force percentage recording. The surface area of the largest and darkest articulation paper mark (n = 240 marks) in each quadrant (n = 60 quadrants) was calculated in photographic pixels, and compared with the force percentage present on the same tooth. RESULTS: Regression analysis shows a bi-variant fit of force % on tooth (P<.05). The correlation coefficient between the mark area and the percentage of force indicated a low positive correlation. The coefficient of determination showed a low causative relationship between mark area and force (r2 = 0.067). The largest paper mark in each quadrant was matched with the most forceful tooth in that same quadrant only 38.3% of time. Only 6 2/3% of mark surface area could be explained by applied occlusal force, while most of the mark area results from other factors unrelated to the applied occlusal force. CONCLUSION: The findings of this study indicate that size of articulation paper mark is an unreliable indicator of applied occlusal force, to guide treatment occlusal adjustments.


Subject(s)
Female , Humans , Bite Force , Occlusal Adjustment , Tooth
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