Class II elastics: timeline and effects?
Posted: Mon Sep 26, 2011 10:39 am
Hi guys,
I assume there are quite a few people who had to wear / is wearing / plans to wear class II elastics. I would appreciate if you could share why you got it (class II correction is obvious, but also midline deviation, other things maybe?), how long into treatment, how long you wore it for and what was the treatment effect.
Any people out there that were/are unilateral class II with midline deviation, treated with class II elastics? How about class II one side, and class III other side?
Also, I have done a little research and see that there seems to be much debate on how exactly class II elastics works, i.e. does it move the teeth or jaws. Here's what I found in one scientific article, maybe that info will be interesting to somebody:
Class II elastics may be used for main and secondary objectives in the following clinical situations: skeletal and/or dental Class II malocclusions, anchorage reinforcement, backward movement of the upper incisors, mandibular arch advancement, buccal tipping of retruded lower incisors, bite opening (class II/2), midline deviation correction.6
They are recommended only after the correction of overbite and segmentation of the maxillary archwire.
The class II elastics have different effects:6
a. effects upon the maxillary arch:upper incisors are more vertical, extrusion and downward movement of anterior occlusal plane, backward movement of the upper arch, dental distalization.
b. effects upon the mandibular arch: buccal tipping of lower incisors, forward movement of the entire mandibular arch, extrusion of the lower first molars.
c. effects on the facial patterns: forward movement of the chin, forward movement of the mandible with a posterior rotation; The lower facial height will depend on the wearing time and the amount of elastic force used.
d. effects on the occlusal plane:lowering of the anterior occlusal plane, sagital correction of the Class II relationship.
I assume there are quite a few people who had to wear / is wearing / plans to wear class II elastics. I would appreciate if you could share why you got it (class II correction is obvious, but also midline deviation, other things maybe?), how long into treatment, how long you wore it for and what was the treatment effect.
Any people out there that were/are unilateral class II with midline deviation, treated with class II elastics? How about class II one side, and class III other side?
Also, I have done a little research and see that there seems to be much debate on how exactly class II elastics works, i.e. does it move the teeth or jaws. Here's what I found in one scientific article, maybe that info will be interesting to somebody:
Class II elastics may be used for main and secondary objectives in the following clinical situations: skeletal and/or dental Class II malocclusions, anchorage reinforcement, backward movement of the upper incisors, mandibular arch advancement, buccal tipping of retruded lower incisors, bite opening (class II/2), midline deviation correction.6
They are recommended only after the correction of overbite and segmentation of the maxillary archwire.
The class II elastics have different effects:6
a. effects upon the maxillary arch:upper incisors are more vertical, extrusion and downward movement of anterior occlusal plane, backward movement of the upper arch, dental distalization.
b. effects upon the mandibular arch: buccal tipping of lower incisors, forward movement of the entire mandibular arch, extrusion of the lower first molars.
c. effects on the facial patterns: forward movement of the chin, forward movement of the mandible with a posterior rotation; The lower facial height will depend on the wearing time and the amount of elastic force used.
d. effects on the occlusal plane:lowering of the anterior occlusal plane, sagital correction of the Class II relationship.