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

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ClinicalTrials.gov Identifier: NCT04690361

Recruitment Status : Recruiting

First Posted : December 30, 2020

Last Update Posted : January 19, 2022

See Contacts and Locations

Sponsor:

Information provided by (Responsible Party):

National Taiwan University Hospital

Study Description

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.

Condition or disease
Bite Force, EMG

Study Design

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Study Type :	Observational
Estimated Enrollment :	24 participants
Observational Model:	Other
Time Perspective:	Cross-Sectional
Official Title:	Monitoring the EMG Activity and Investigating the Relation Between Occlusal Contact Areas and Occlusal Loads During Light or Heavy Occlusal Forces
Actual Study Start Date :	November 1, 2020
Estimated Primary Completion Date :	January 19, 2022
Estimated Study Completion Date :	July 31, 2022

Groups and Cohorts

Outcome Measures

Primary Outcome Measures :

The relation between occlusal force and EMG data [ Time Frame: immediately after the intervention ]

Eligibility Criteria

Information from the National Library of Medicine

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Ages Eligible for Study:	20 Years to 40 Years (Adult)
Sexes Eligible for Study:	All
Accepts Healthy Volunteers:	Yes
Sampling Method:	Non-Probability Sample

Study Population

healthy subject of dental patient at NTUH
dental students

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

Contacts and Locations

Information from the National Library of Medicine

To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.

Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT04690361

Contacts

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Contact: TongMei Wang	+886-2-23123456 ext 66864	tongmeiwang@ntu.edu.tw
Contact: ChenPing Lin	+886-2-23123456 ext 66864	b99402005@ntu.edu.tw

Locations

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Taiwan
National Taiwan University Hospital	Recruiting
Taipei City, Zhongzheng District, Taiwan, 100
Contact: TongMei Wang, PHD +886-2-23123456 ext 66864 tongmeiwang@ntu.edu.tw

Sponsors and Collaborators

National Taiwan University Hospital

Investigators

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Principal Investigator:	TongMei Wang, PHD	School of Dentistry, National Taiwan University College of Medicine.

More Information

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Responsible Party:	National Taiwan University Hospital
ClinicalTrials.gov Identifier:	NCT04690361
Other Study ID Numbers:	202008002RINA
First Posted:	December 30, 2020 Key Record Dates
Last Update Posted:	January 19, 2022
Last Verified:	January 2022

Keywords provided by National Taiwan University Hospital:


occlusal contact,occlusal force,Electromyography,Dental PreScale System

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