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Int Poster J Dent Oral Med 14 (2012), No. 2     15. June 2012

Int Poster J Dent Oral Med 2012, Vol 14 No 2, Poster 591

Miniscrew biomechanics of maxillary posterior segment intrusion

Language: English
 

Authors:
Dr. A. Sumathi Felicita,
Department of Orthodontics, Saveetha Dental College, Vellapanchavadi, Chennai, Tamil Nadu, India

Date/Event/Venue:
17-19 Dec, 2010
45th Indian Orthodontic Conference
Mangalore
 

Types of intrusion

Parallel:
Molars and premolar intrude to same level. Indication: gummy smile, Long face.

Non Parallel:
2nd molar intrude more than the 1st premolar. Indication: Open bite.

Unilateral:
Control of tooth movement in all three planes of space difficult.

Bilateral:
Three dimensional control of tooth movement possible.

Parallel intrusion Non Parallel intrusion
Unilateral intrusion Bilateral intrusion
 

Biomechanical consideration for 1st order and 3rd order control (control of arch form & torque)

Type I
Buccal intrusive force. Palatal torque in arch wire. Disadv: Arch expansion, bowing of arch.

Type II
Buccal intrusive force. Constrictive bend in arch wire. Disadv: No control of second molar.

Type III
Buccal and palatal intrusive force. Disadv: no control in point of palatal force application.

Type IV
Bucccal intrusive force. Cross arch splinting. Disadv: Reduced efficiency of movement, insufficient torque control.

Biomechanical consideration for 1st order and 3rd order control-Type I Biomechanical consideration for 1st order and 3rd order control-Type II
Biomechanical consideration for 1st order and 3rd order control-Type III Biomechanical consideration for 1st order and 3rd order control-Type IV
 

Biomechanical consideration for 2nd order control (control of occlusal plane)

Type I
Intrusive force near second molar. Ideal for sagittal control of the occlusal plane.

Type II
Second order bend for second molar control.

Type III
Single implant. Two forces to generate moment. 'L' bend to increase biomechanical efficiency.

Biomechanical consideration for 2nd order control-Type I Biomechanical consideration for 2nd order control-Type II
 
Biomechanical consideration for 2nd order control-Type III
 
 

Ideal appliance system

Buccal and palatal force near the molars. Superior in all biomechanical aspect. Controls vertical position, arch form, axis and torque of individual teeth and inclination of occlusal plane.

 
Ideal appliance system
 
 

This Poster was submitted by Dr. A. Sumathi Felicita.
 

Correspondence address:
Dr. A. Sumathi Felicita
Saveetha Dental College
Department of Orthodontics
162 Poonamallee High Road
Vellapanchavadi, Chennai, Pin Code - 600077
Tamil Nadu
India