Distal molar tipping and anchorage loss at the incisors.
Ghosh and Nanda (5) evaluated 41 patients treated with pendulum appliance and found 57% of the average class II correction was molar distalization and 43% maxillary first premolar and anterior anchorage loss.
62 mm more anchorage loss of the maxillary incisor edge and increased treatment time.
The purpose of the present study was to evaluate and compare the effects of Jones jig and distal jet appliance during class-II molar correction with maxillary first molar distalization, its tipping, extrusion, rotation as well as anchorage loss at premolar-incisor unit.
Distal jet appliance was found to be a more effective and predictable method for the maxillary first molar distalization through bodily translation with minimum tipping, extrusion, and rotation as well as anchorage loss.
The resistance to anchorage loss was greater in lingual force application, especially in horizontal direction (fig.
The introduction of the orthodontic implant decreased dramatically the anchorage loss, both in lingual and labial model (tab.
58) The ability of orthodontic miniscrews to provide absolute anchorage was shown by a recent study comparing canine retraction anchorage loss with the use of miniscrew implants and with conventional molar anchorage.
Comparison and measurement of the amount of anchorage loss of the molars with and without the use of implant anchorage during canine retraction.
The purpose of study was to evaluate treatment effects of Distal Jet Appliance during Class-II molar correction with a focus on the magnitude of Maxillary first molar distalization, its tipping, extrusion, rotation as well as anchorage loss at premolar-incisor unit.
Anchor-age control is of great importance in orthodontic treat-ment, and researchers have made many modifications to minimize anchorage loss.
TABLE-6: MAXILLARY FIRST MOLAR DISTALIZATION AND ANCHORAGE LOSS WITH DISTAL JET APPLIANCE (A COMPARISON OF STUDIES)