Evaluation of maxillary first molar rotation during direct miniscrew-supported maxillary canine retraction: a before-and-after study (original) (raw)
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Journal of Indian Orthodontic Society
Introduction: The objective of the study was to assess the rate of canine retraction and secondary outcomes associated with conventional fixed orthodontic treatment (CFO) and CFO with micro-osteoperforation (CFO + MOP), that is, anchorage loss, root resorption, vitality of tooth, pain and discomfort level during the procedure. Methods: A total of 16 patients with Class II Division 1 malocclusion who required upper first premolar extraction with lower non-extraction/single incisor extraction were divided into the test group (MOP) and positive control group (CFO + MOP) for a split-mouth study. Both maxillary canines were retracted with nickel–titanium (NiTi) closed coil springs. Patients were reviewed after 24 hours, 7 days, 28 days, and 4, 8, and 16 weeks to assess the rate of tooth movement, anchorage loss, root resorption, vitality of tooth, pain and discomfort level. Results: There was a statistically significant difference in the rate of tooth movement between the CFO and CFO + M...
2021
The objective of this study is to compare the rate of canine retraction between conventional labial retraction force versus palatal retraction force with labial appliance. Subjects and methods This prospective randomized clinical study was conducted on a sample of 26 patients recommended for upper first premolar extraction as part of their orthodontic treatment plan. The patient ages ranged from (16-26) years. Patients were randomly divided into two groups; Group I: Thirteen patients, treated with Roth brackets 0.022-inch slot for labial orthodontic appliance with palatal retraction force. Group II: Thirteen patients, treated with Roth brackets 0.022-inch slot for labial orthodontic appliance with labial retraction force. Results The canine retraction rate was measured clinically using dental vernier at monthly intervals. The distance measured was between maxillary canine cusp tip and maxillary first molar mesiobuccal cusp tip. Measurement was done till closure of the extraction spa...
Journal of Evolution of Medical and Dental Sciences
BACKGROUND This study was conducted to determine angular changes of maxillary canine in en masse retraction of anterior teeth in a new modified power arm with a conventional intraoral anchorage unit compared to a mini-implant anchorage in the first premolar extraction case. We wanted to compare angular changes of maxillary canine between modified conventional anchorage with a power arm and titanium mini-implant anchorage in en masse retraction. METHODS A total of 15 participants requiring maxillary first premolar extraction was selected for this study. In each participant, the en mass retraction was carried out with miniimplants on one side & modified conventional anchorage with a power arm on the other side. The choice of mode of retraction on the right and the left side was done based on the coin flip method. Angular position of the maxillary canine was evaluated on orthopantomogram (OPG) & diagnostic cast. RESULTS A mean disto-palatal rotation observed post retraction was of 9° o...
Mini-implant anchorage for maxillary canine retraction: A pilot study
American Journal of Orthodontics and Dentofacial Orthopedics, 2006
Introduction: This clinical pilot study evaluated the stability, surrounding soft-tissue health, and patient comfort and acceptance of a mini-implant used as anchorage for maxillary permanent canine retraction. Methods: The study was conducted in the Graduate Orthodontic Clinic of the University of Oklahoma College of Dentistry. The sample comprised 16 subjects who had maxillary first premolars extracted. In each patient, Ortho Implants (IMTEC, Ardmore, Okla) were placed laterally in the maxillary alveolar ridge between the roots of the permanent first molars and the second premolars by an oral surgeon. All retraction was accomplished on 0.017 ϫ 0.025-in stainless steel archwires in 0.022-in slots by using nickel-titanium springs stretched from the implant head to the brackets on the canines. Results: Placement protocol strongly affected the stability of the implants; 1 protocol resulted in the loss of 51% of the implants (19 of 39), and the second protocol resulted in 100% stability (10 of 10). The surrounding soft tissue remained healthy around stable implants and less healthy around implants that were unstable or lost. Patient comfort was excellent in all but 1 patient. Rates of canine retraction were calculated monthly and varied widely from ϩ6.1 to Ϫ1.5 mm per month. Excessive crown tipping into the extraction spaces was observed in 4 of the 28 retracted canines and was related to the method of ligation of the canine to the archwire. Conclusions: Ortho Implants are adequate anchorage for maxillary canine retraction when properly placed.
Canine retraction using new Curved Sliding Technique and miniscrew anchorage
Background and Aim: Canine retraction is an important stage in many orthodontic cases involving extraction. The aim of this study was to develop a new technique for canine retraction and to evaluate it clinically with the use of miniscrew anchorage. Materials and Methods: The sample comprised of fifteen patients (eight females and seven males)who had maxillary first premolars extracted and maximum anchorage was indicated in all subjects to solve crowding or protrusion. Canine retraction was done using new Curved Sliding Technique and miniscrew anchorage. Miniscrews were inserted between the maxillary second premolar and the first molar in the attached gingiva near the mucogingival junction. 150 g of force was applied with nickel-titanium coil springs. The evaluation was done on lateral cephalometric radiographs and dental casts. Paired-samples t test was used to evaluate the changes within group. Results: The study showed excellent control of canine axis with intrusion (1.5 mm) and perfect rotational control during retraction. The rate of canine retraction was 1.32 mm/month. Conclusion: The new technique demonstrated excellent efficiency in canine retraction and good rate of space closing due to the reduction of friction.
Evaluation of Canine Retraction Using Double Slot Vs. Single Slot Orthodontic Brackets; CBCT Study
Al-Azhar Assiut Dental Journal (Print), 2022
Aim. The duration of orthodontic treatment is the primary concern of almost all the patients. Therefore, this increases the demand to find the best method to increase the rate of tooth movement with the least possible disadvantages. Subjects and Methods: This prospective randomized clinical study was conducted on a total sample of 32 orthodontic patients recommended for upper first premolar extraction as part of their orthodontic treatment plan. The patient ages were ranged from (16-26) years. Patients were assigned to (Group I) single slot bracket, (Group II) double slot bracket. Results: Regarding the post-treatment value, a significantly higher mean value was recorded for Canine Vertical Tipping Angle in single slot bracket group (12.65±6.15), in comparison to double slot bracket group (7.31±2.71), (p=0.00). Canine Cusp Retraction Distance showed a non-significant higher value in double slot bracket group (p=0.30). Conclusion: Double slot bracket is very effective in canine retraction as it showed less canine vertical tipping and more bodily movement during retraction, and more apex retraction value in comparison with single slot bracket.
European Scientific Journal, 2014
The purpose of this study was to investigate the stability of temporary anchorage devices, rate of bodily canine retraction and anchorage loss using miniscrews as a skeletal anchorage mean. The sample comprised twelve patients (3 males and 9 females, age range 17-28 years) who were scheduled for extraction of upper premolars. After leveling and alignment, a pilot drill was used and titanium miniscrews1.2-1.3 mm in diameter and 8 mm length were inserted into the buccal cortical bone between the maxillary second premolars and first molars on both sides. Immediate loading of miniscrews and immediate canine retraction after extraction was performed. The canines were retracted with nitinol springs extending from the canine brackets to the mini-implant. Force magnitude was initially 75 gf and increased to 150 gf after 3 weeks. Patients were seen at 3-week intervals until retraction was considered complete. Stability, gingival index around miniscrews, and patient comfort were rated. Retraction distance evaluated by measuring distance between cusp tip of maxillary canine to buccal cusp tip of maxillary second premolar. Pre and post-retraction panoramic x-rays were taken to categorize type of canine retraction. Pre and post-retraction cephalometric xrays were superimposed for measuring the amount of anchorage loss. The results revealed a success rate of 87.5% of the miniscrews. 62.5% of miniscrews had healthy gingiva, and 12.5% were acutely inflamed. Bodily retraction of canines occurred only in 61.9% of the cases. Mean anchorage loss was 0.21 mm. The first interval had the lowest mean retraction distance. The mean rate of retraction was 0.39 mm per week. In conclusion, the TADs are stable absolute anchorage units that can be used for rapid canine retraction. Close relationship exists between implant loss and soft tissue health.
The Angle Orthodontist, 2019
Objectives: To investigate the canine retraction rate and anchorage loss during canine retraction using self-ligating (SL) brackets and conventional (CV) brackets. Differences between maxillary and mandibular rates were computed. Materials and Methods: Twenty-five subjects requiring four first premolar extractions were enrolled in this split-mouth, randomized clinical trial. Each patient had one upper canine and one lower canine bonded randomly with SL brackets and the other canines with CV brackets but never on the same side. NiTi retraction springs were used to retract canines (100 g force). Maxillary and mandibular superimpositions, using cephalometric 45° oblique radiographs at the beginning and at the end of canine retraction, were used to calculate the changes and rates during canine retraction. Paired t-tests were used to compare side and jaw effects. Results: The SL and CV brackets did not show differences related to monthly canine movement in the maxilla (0.71 mm and 0.72 m...
Al-Rafidain Dental Journal, 2005
Aim: To evaluate the effect of loops geometry (design) on the rate of space closure, degree of rotation, and degree of tipping. Materials and Methods: The sample consisted of 8 type of loops, namely vertical-loop, vertical with helix-loop, T-loop, readymade loop, PG (universal retraction spring)-loop, opus-loop, teardrop-loop, and L-loop. The method adapted in present study was carried out on Typodont simulation system. The data subjected to the descriptive and variance statistics at 0.05 significant level. Results: There was a significant difference between loops in rate of space closure, rotation and tipping. Vertical loops gave higher significance of rate of space closure and also higher significance degree of rotation and tipping when compared with other loops, while the readymade loop is lowest significance a rate of space closure but it gave low degree rotation and tipping. Although Tloop gave a rate of space closure less than vertical loops but it had the lowest significant degree of rotation and tipping. Conclusion: The T-loop is so more controls and simplest than other loops performing low significance of rotation and tipping tooth movements and achieving higher significance in rate of space closure,