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

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.

Study Overview

• Status: Recruiting
• Conditions: Bite Force, EMG

• Study Type: Observational
• Enrollment (Anticipated): 24

Contacts and Locations

• Study Contact: Name: TongMei Wang; Phone Number: 66864 +886-2-23123456; Email: tongmeiwang@ntu.edu.tw
• Study Contact Backup: Name: ChenPing Lin; Phone Number: 66864 +886-2-23123456; Email: b99402005@ntu.edu.tw

Study Locations

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

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: 20 years to 40 years (Adult)
• Accepts Healthy Volunteers: Yes
• Genders Eligible for Study: All

• Sampling Method: Non-Probability Sample

Study Population

1. healthy subject of dental patient at NTUH
2. dental students

Description

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

Study Plan

How is the study designed?

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Time Frame
The relation between occlusal force and EMG data	immediately after the intervention

Collaborators and Investigators

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

Study record dates

Study Major Dates

• Study Start (Actual): November 1, 2020
• Primary Completion (Anticipated): May 19, 2023
• Study Completion (Anticipated): July 31, 2023

Study Registration Dates

• First Submitted: December 27, 2020
• First Submitted That Met QC Criteria: December 27, 2020
• First Posted (Actual): December 30, 2020

Study Record Updates

• Last Update Posted (Estimate): February 22, 2023
• Last Update Submitted That Met QC Criteria: February 20, 2023
• Last Verified: February 1, 2023

More Information

Terms related to this study

• Keywords: occlusal contact,occlusal force,Electromyography,Dental PreScale System
• Other Study ID Numbers: 202008002RINA