Class III elastic, which is one of the most widely used mechanisms for Class III correction, has disadvantages, such as the need for patient cooperation, tipping movement, anchorage loss
and extrusion of maxillary molars (2).
[1, 11] No anchorage loss
was noticed on both the sides.
There are various management strategies to correct deep bite, which includes intrusion of incisors, proclinations of lower incisors, and extrusion of posterior teeth.18-20 Intrusion of lower incisors in growing patients can be achieved by using intrusion arches while in adults it can be achieved without anchorage loss
by using skeletal anchorage devices.21 According to the results of present study in most of the dental deep bite patients in our setup, strategy should be focused on intrusion of lower incisors for correction of curve of spee.
Numerous studies have the evaluated the anchorage loss
of maxillary and/or mandibular first molars during space closure.
The upper arch received a T-loop symmetrically activated, type B, to provide anterior retraction and anchorage loss
at the same time.
However, unwanted tooth movement, known as anchorage loss
, is a major pitfall of these anchorage reinforcement methods.
The resistance to anchorage loss
was greater in lingual force application, especially in horizontal direction (fig.
A comparison of intra-arch distalizers and bone anchorage has demonstrated unwanted side effects in terms of anchorage loosening, increased overjet, molar anchorage loss
during retraction, and mandibular clockwise rotation with the use of a pendulum (11).
Distal molar tipping and anchorage loss
at the incisors.
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.
In the present study, the pendulum appliance was supported with one mini-screw to avoid the anchorage loss
, and the appliance was fixed to maxillary first premolars with two occlusal clasps to eliminate the failure of the mini-screw; therefore, mobility or loss of mini-screws was not observed during the distalization period.
(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.