Monitoring the EMG Activity and Investigating the Relation Between Occlusal Contact Areas and Occlusal Loads During Light or Heavy Occlusal Forces

NCT ID: NCT04690361

Last Updated: 2023-02-22

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 24 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2020-11-01
• Study Completion Date: 2023-07-31

Brief Summary

Inappropriate occlusal contact may affect the long-term prognosis of prosthodontic rehabilitation. It is suggested to design light or without occlusal contact on implant prostheses when the patient bites with light force, and normal occlusal contact when the patient bites with heavy force. The concept of this "implant-protective occlusion" is based on the difference of movement between implants and natural teeth. However, how much force generated during a light bite or a heavy bite is not clearly defined in the literature. Traditional methods to evaluate the occlusal contacts between antagonist teeth such as wax, silicone, occlusal paper, and occlusal foil cannot evaluate the occlusal force. Recently, modern digital occlusion analysis systems (T-Scan, Dental Prescale II) can evaluate occlusal force on almost normal intermaxillary relation. The objects of this investigation are: (1) to evaluate the effect of difference occlusal forces on the number, distribution and size of occlusal contacts examined by 8μm occlusal foil and Dental Prescale II System (DPS); (2) to analyze the relation between EMG activity and occlusal forces and to identify the magnitude of light and heavy bite force the patients may exert during occlusal examination; (3) to compare the results between habitual chewing side and the other side. Twenty-four subjects will be included in this study. With EMG biofeedback, the subjects will exert 35%、70%、100% of maximum contraction EMG of clenching and the subjects' occlusal contacts will be tested with the 8μm occlusal foil and DPS. Each condition will be tested three times. The subjects will chew gums to confirm their habitual chewing side after the occlusal tests. Numbers, distribution, and size of occlusal contacts will be analyzed and compared. This study may identify the magnitude of perceptual light and heavy occlusal forces and the maximum occlusal force. The results are helpful for setting up the protocol and strategy of occlusal adjustment and to prevent biomechanical complications of dental prostheses.

Conditions

Bite Force, EMG

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: CROSS_SECTIONAL

Eligibility Criteria

Inclusion Criteria

Inclusive criteria:

• full dentition except third molar
• class I occlusion at bilateral canines and first molars (Angle's classification)
• healthy periodontal condition
• can sign consent

Exclusive criteria:

-history of temporomandibular disorders

• Minimum Eligible Age: 20 Years
• Maximum Eligible Age: 40 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: Yes

Sponsors

National Taiwan University Hospital

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

TongMei Wang, PHD

Role: PRINCIPAL_INVESTIGATOR

School of Dentistry, National Taiwan University College of Medicine.

Locations

National Taiwan University Hospital

Taipei, Zhongzheng District, Taiwan

Site Status: RECRUITING

Countries

Taiwan

Central Contacts

TongMei Wang

Role: CONTACT

tongmeiwang@ntu.edu.tw

+886-2-23123456 ext. 66864

ChenPing Lin

Role: CONTACT

b99402005@ntu.edu.tw

+886-2-23123456 ext. 66864

Facility Contacts

TongMei Wang, PHD

Role: primary

tongmeiwang@ntu.edu.tw

+886-2-23123456 ext. 66864

Other Identifiers

202008002RINA

Identifier Type: -

Identifier Source: org_study_id