Clinical trial NCT04690361: Monitoring the EMG Activity and Investigating the Relation Between Occlusal Contact Areas and Occlusal Loads During Light or Heavy Occlusal Forces
Official title: Monitoring the EMG Activity and Investigating the Relation Between Occlusal Contact Areas and Occlusal Loads During Light or Heavy Occlusal Forces
Study type: OBSERVATIONAL
Overall status: UNKNOWN
Conditions: Bite Force, EMG
Keywords: occlusal contact,occlusal force,Electromyography,Dental PreScale System
Lead sponsor: National Taiwan University Hospital
Sponsor class: OTHER
First posted: 2020-12-30
Enrollment: 24
Sex: ALL
Minimum age (years): 20
Maximum age (years): 40
Standard ages: ADULT
Accepts healthy volunteers: yes
Observational model: OTHER
Time perspective: CROSS_SECTIONAL
Sampling method: NON_PROBABILITY_SAMPLE
Study population: 1. healthy subject of dental patient at NTUH
2. dental students

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.


Eligibility 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

Primary outcomes:
measure: The relation between occlusal force and EMG data
timeFrame: immediately after the intervention
Secondary outcomes:
Other outcomes:
Locations:
city: Taipei City
country: Taiwan
facility: National Taiwan University Hospital
state: Zhongzheng District
Study officials:
affiliation: School of Dentistry, National Taiwan University College of Medicine.
name: TongMei Wang, PHD
role: PRINCIPAL_INVESTIGATOR
References: