3D Image Analysis for Smiling Movement in Normal, Orthognathic and Cleft Lip and Palate Patients

Project: National Science and Technology CouncilNational Science and Technology Council Academic Grants

Project Details


Smiling is the most important function of facial expression and serving the key role for personal communication. Recently, how to create a beautiful smiling is emphasized by all dental professions. However, the published studies on smiling were limited to static status of smiling, induced smiling under artificial setting, two dimensional analysis. The three dimensional dynamic image analysis on the smiling mechanism, and symmetric coordination of orofacial muscles is really needed. This 3-year study proposal is going to investigate the smiling mechanism on normal adult, orthognathic and cleft lip and palate patients. 1st year:normal adult, 20~50 years old, 30 persons for each gender. 2nd year : adults seeking orthognathic surgery, 30 persons for mandibular proguathism,30 persons for bimaxillary protrusiom. Smiling will be recorded lee fore, 6 month and one year after surgery. 3rd year:adults with cleft lip and palate, 50 persons with unilateral complete cleft lip and palate. 20 persons with bilateral complete cleft lip and palate. Study procedure (1) Emotion Facial Action Coding System(EMFACS). Digital camera will continuously taken pictures(5 per second for 54 pictures)while patients are in rest, posed smile, Duchenne smile. The action units(AUs)of facial expression will be recorded and analysed, according to 1.AUs involvement 2. AUs intensity 3. AUs asymmetry. (2) 3D Surface Scan of craniofacial area. 3D Surface Scan will lee used to record patients in rest, and duchenne smile. 3D image analysis will lee done to assess symmetry and coordination of facial movement. EMFACS should be the first application from psychoanalysis to oral science. EMFACS should help to differentiate the posed smiling from Duchene smiling in normal adult, orthognathic surgery and cleft lip and palate patients. EMFACS data will be correlated with 3D surface scan data. This study proposal will provide more scientific evidence to support the smiling mechanism in clinical application.

Project IDs

Project ID:PC9709-0948
External Project ID:NSC97-2314-B182-020-MY2
Effective start/end date01/08/0831/07/09


  • Smi1e
  • Duchenne Smile
  • Posed Smile
  • 3D Craniofacial Image
  • 3D


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