Related Experiment Video
Updated: Jun 5, 2026

Treatment of Facial Deformities using 3D Planning and Printing of Patient-Specific Implants
Published on: May 23, 2020
[Treatment of skeletal Class III adult patients with facemask protraction]
Jie Pan1, Yin-zhong Duan, Jing Zhang
1Department of Orthodontics, The Fourth Military Medical University, Xi'an 710032, China.
Objective:
To investigate the clinical effects of facemask protraction on skeletal Class III adult patients.
Methods:
Totally 15 skeletal Class III patients (male 7, female 8, aged 18 - 24 years) were included in the study. Removable and fixed appliances were used in the upper or lower arches. Facemask protraction was used at night for about 7 months and Class III elastics were worn during the day. The total treatment time was 24 mouths on average. Cephalometric analysis was carried out before and after treatment.
Results:
The profile was greatly improved and Class I molar relationship was achieved. SNA angle was increased from (79.6 ± 3.7)° to (81.1 ± 3.8)°. SNB angle was decreased from (83.5 ± 3.3)° to (82.6 ± 3.6)°. ANB angle was increased from (-4.1 ± 2.0)° to (-1.5 ± 1.8)°.
Conclusions:
Protraction was effective in the treatment of skeletal Class III adult patients.
Related Concept Videos
Cardiopulmonary Resuscitation II: ACLS Airway Management
Tracheostomy Care II: Procedure
Step 1: Perform hand hygiene, and put on personal protective equipment: gown, gloves, mask and...
Flail Chest-II
Assessment:
1. Clinical Evaluation:
History:
Oxygen Delivering System II: Venturi Mask and Transtracheal Oxygen
Venturi Mask
The Venturi mask, named after the Venturi effect, is designed to deliver precise oxygen concentrations. It consists of a large tube with an oxygen inlet that narrows down, causing a pressure drop that pulls air in through adjustable side ports. The mask is a lightweight,...
Cardiopulmonary Resuscitation V: Advanced Airway Management Techniques
Skeletal Muscle Relaxants: Therapeutic Uses

