NCT00172692

Brief Summary

Soft food chewing does not require strong bite force. The number of chewing strokes and occlusal surface area of the posterior teeth are more important. Clinically, reduction of occlusal surface to protect the abutments of a fixed or removable partial denture or the implant supported teeth is often necessary. If a certain chewing ability is maintained with reduced occlusal area, changing chewing velocity might help. For this hypothesis, the effect of chewing velocity on soft food chewing ability would be observed first. The purpose of this study is to evaluate the deliberately changed chewing gum chewing velocity on the chewing ability of healthy subjects whose dental occlusal surface area is known. Twenty dental students (10 men and 10 women with an age range of 20-30 years) with healthy masticatory systems and complete dentition will be asked to chew HA containing chewing gum with habitual side teeth at the cycle time of 0.5 sec, 1.0 sec and 1.5 sec for 30, 40, and 50 times. Jaw movement, tooth contact, and muscle activities will be observed during chewing gum chewing. The distribution of HA particles in the gum bolus after each chewing session will be measured and regarded as the chewing efficiency of that subject. Occlusal surface area of the maxillary posterior teeth, chewing rate, chewing time, muscle activity and jaw lateral displacement will be related to the chewing efficiency with multiple regression analysis. The effects of practice due to changing of chewing rate will also be evaluated.

Trial Health

87
On Track

Trial Health Score

Automated assessment based on enrollment pace, timeline, and geographic reach

Timeline
Completed

Started Jul 2004

Shorter than P25 for all trials

Geographic Reach
1 country

1 active site

Status
completed

Health score is calculated from publicly available data and should be used for screening purposes only.

Trial Relationships

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Study Timeline

Key milestones and dates

Study Start

First participant enrolled

July 1, 2004

Completed
1 month until next milestone

Study Completion

Last participant's last visit for all outcomes

August 1, 2004

Completed
1.1 years until next milestone

First Submitted

Initial submission to the registry

September 12, 2005

Completed
3 days until next milestone

First Posted

Study publicly available on registry

September 15, 2005

Completed
Last Updated

December 15, 2006

Status Verified

June 1, 2005

First QC Date

September 12, 2005

Last Update Submit

December 14, 2006

Conditions

HealthyMastication

Keywords

Chewing efficiency,Gum chewingChewing velocityOcclusal surface areaEMGJaw movement

Eligibility Criteria

Age20 Years - 30 Years
Sexall
Healthy VolunteersYes
Age GroupsAdult (18-64)

You may qualify if:

  • Dental students
  • Healthy masticatory system

Contact the study team to confirm eligibility.

Sponsors & Collaborators

Study Sites (1)

National Taiwan University Hospital

Taipei, 886, Taiwan

Location

Study Officials

  • Yuh-Yuan Shiau, Professor

    National Taiwan University Hospital

    STUDY CHAIR

Study Design

Study Type
observational
Time Perspective
OTHER
Sponsor Type
OTHER

Study Record Dates

First Submitted

September 12, 2005

First Posted

September 15, 2005

Study Start

July 1, 2004

Study Completion

August 1, 2004

Last Updated

December 15, 2006

Record last verified: 2005-06

Locations

TW(1)