Brief Report
Teeth discoloration during orthodontic treatment
Objective: Teeth discoloration is a rare orthodontic complication. The aim of this study was to report the clinical progression of discoloration during orthodontic treatment. Methods: Discolored teeth, detected during orthodontic treatment between January 2003 and December 2012 by a single dentist using similar techniques and appliances, were analyzed. Results: The total number of teeth that showed discoloration was 28. Progression of discoloration was evaluated in only 24 teeth that were observed without any treatment. During the observation period, the discoloration “improved” in 8 of the 24 teeth (33.3%) and was “maintained” in 16 (66.6%). The electric pulp test performed at the time of initial detection of discoloration showed 14.3% positivity, which improved to 21.4% at the final follow-up. None of the initial and final follow- up radiographic findings showed any abnormalities. Conclusions: When teeth discoloration is detected during orthodontic treatment, observation as an initial management is recommended over immediate treatments.
[Korean J Orthod 2017;47(5):334-339]
CLINICIAL'S CORNER
Molar uprighting by a nickel-titanium spring based on a setup model
Molar uprighting is an important adjunctive treatment in orthodontics: repositioning the tilted molar eliminates the potentially pathologic condition and simplifies the ultimate restorative procedure. Although various methods for molar uprighting have been applied successfully, they still have some limitations and disadvantages in tooth movement. This article reports on a new clinical technique for molar uprighting with nickel-titanium springs based on a setup model. Two patients treated with this system are shown.
[Am J Orthod Dentofacial Orthop 2014;146:119-23
CASE REPORT
Maxillary molar derotation and distalization by using a nickel-titanium wire fabricated on a setup model
The purpose of this article is to introduce a simple appliance that uses a setup model and a nickel-titanium (Ni-Ti) wire for correcting the mesial rotation and drift of the permanent maxillary first molar. The technique involves bonding a Ni-Ti wire to the proper position of the target tooth on a setup model, followed by the fabrication of the transfer cap for indirect bonding and its transfer to the patient’s teeth. This appliance causes less discomfort and provides better oral hygiene for the patients than do conventional appliances such as the bracket, pendulum, and distal jet. The treatment time is also shorter with the new appliance than with full-fixed appliances. Moreover, the applicability of the new appliance can be expanded to many cases by using screws or splinting with adjacent teeth to improve anchorage.
[Korean J Orthod 2017;47(4):268-274]
CASE REPOET
Correction of palatally displaced maxillary lateral incisors without brackets
This article describes the orthodontic treatment of a 25-year-old Korean female patient with anterior crowding, including palatally displaced lateral incisors. Her facial profile was satisfactory, but 3.5 mm of maxillary anterior crowding was observed. To correct this crowding, we decided to minimize the use of the conventional fixed orthodontic appliances and employed a less bulky and more aesthetic appliance for applying light continuous force. We determined the final positions of the maxillary teeth via a working model for diagnostic set up and achieved space gaining and alignment with simple Ni-Ti spring and stainless steel round tubes. Tooth alignment was achieved efficiently and aesthetically without the conventional brackets.
[Korean J Orthod 2013;43(4):201-206]
ARTICLE
Intrusion of Palatally Displaced Maxillary Lateral Incisors Using Nickel Titanium Closed-Coil Springs
In patients with maxillary anterior crowding, the upper lateral incisors are often inclined pala- tally; moreover, such incisors are almost always extruded due to lack of contact with the opposing teeth. The resulting crossbite limits accessibility for bracket placement, so that initial alignment requires adequate space to be opened before the teeth are intruded and labial root torque is added. A new spring* developed in our clinic at Ewha Womans University, called the EW spring, exerts a light, continuous force of less than 50g. We believe the
EW closed-coil spring, with its light, continuous force and lack of friction, is more efficient than conventional fixed-appliance systems for the intru- sion of upper lateral incisors.
[J Clin Orthod. 2015 Apr;49(4):270-2]
ARTICLE
Correction of Palatally Displaced
Maxillary Lateral Incisors
Using a Tube System
In young patients with severe maxillary crowd- ing, the buds of the permanent lateral incisors are often in crossbite with the adjacent teeth. If insufficient space is available for these incisors to erupt, palatal displacement can occur. At the Ewha Womans University dental clin- ic, a system referred to as Ewha Tubing Mechanics
(ETM) is routinely used to correct such anterior crossbite. The ETM consists of three commer- cially available .022".025" auxiliary tubes* and a segment of small, round nickel titanium wire. The system not only corrects palatal tipping, but can also achieve significant intrusion, avoiding the need for additional bite-opening devices.
[J Clin Orthod. 2008; August]