Comparative evaluation of the efficiency of canine retraction using modified marcotte and opus loop – A split mouth, randomized clinical trial (original) (raw)

The Effect of Using Self-ligating Brackets on Maxillary Canine Retraction: A Split-mouth Design Randomized Controlled Trial

The journal of contemporary dental practice, 2016

Introduction: The results of previous studies about the efficacy of using self-ligating brackets (SLBs) in controlling canine movement during retraction are not in harmony. Therefore, the current study aimed to compare the effects of using new passive SLBs on maxillary canine retraction with sliding mechanics vs conventional ligating brackets (CLBs) tied with metal ligatures. Materials and methods: The sample comprised 15 adult patients (4 males, 11 females; 18-24 years) requiring bilateral extraction of maxillary first premolars. Units of randomization are the left or right maxillary canines within the same patient. The two maxillary canines in each patient were randomly assigned to one of the two groups in a simple split-mouth design. The canines in the SLBs group (n = 15) were bracketed with SLBs (Damon Q™), while the canines in the CLBs group (n = 15) were bracketed with conventional brackets (Mini Master Series). Transpalatal bars were used for anchorage. After leveling and alignment, 0.019 × 0.025˝ stainless steel working archwires were placed. Canines were retracted using a nickel-titanium close-coil springs with a 150 gm force. The amount and rate of maxillary canine retraction, canine rotation, and loss of anchorage were measured on study models collected at the beginning of canine retraction (T0) and 12 weeks later (T1). Differences were analyzed using paired-samples t-tests. Results: The effect differences were statistically significant (p < 0.001). Using Damon Q™ SLBs, the amount and rate of canine retraction were greater, while canine rotation and anchorage loss were less. Conclusion: From a clinical perspective, extraction space closure can be accomplished more effectively using SLBs.

Comparing the rotational control during canine retraction using two different bracket systems – Synergy and Self Ligating brackets – Split mouth study

International Journal of Research in Pharmaceutical Sciences

Canine, being the cornerstone of the dental arches, shares an important role in oral functions, esthetics, arch shape and stability. With the new bracket systems that have come to light, which have reduced friction, there is not much literature on how much of a rotation control they have on the cuspids. Hence this study is conducted to compare the efficiency of two least frictional resistance offering brackets – Self-ligating and synergy brackets in terms of rotational control. The study was designed as a prospective randomized controlled split-mouth clinical trial, which included 16 subjects of ages 12-30 years, divided into two groups, left, and the right quadrants receiving Self Ligating and Synergy brackets based on simple randomization, along with a 19*25" SS wire and closed coil springs for individual canine retraction. The patients were reviewed every 21 days for four appointments, and records were taken for each review. Photographs were taken of the cast at every review...

Comparative evaluation of different loops for individual canine and en-masse retraction-a finite element method (fem) study

International Journal of Health Sciences (IJHS), 2022

The aim and objective was to compare and evaluate the T loop, Mushroom loop and Opus loop for individual canine and enmasse retraction for space closure without preactivation bends using finite element method. The geometric model of maxilla was constructed using CBCT scan. The bracket system simulated was of standard MBT bracket system and arch wire used were 19*25 Stainless Steel and 17*25 TMA for fabrication of loops. There were six different models generated with segmented T loop, Mushroom loop & Opus loop and Continuous T loop, Mushroom loop & Opus loop. The software used for post-processing of the model was ANSYS Hypermesh 2019.0. When retraction forces were given with activation of loops, 3038 maximum amount of initial tooth displacement for individual canine retraction was observed for segmented T loop and for en masse retraction it was observed for continuous T loop. Although, there was intrusion of canine for all the three segmented loop, the preferred loop for canine retraction should be segmented T loop and for en masse retraction it should be continuous T loop as it shows least effect of retraction forces on anterior as well as posterior teeth during application of retraction force.

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.

Maxillary canine retraction rate using two different orthodontic mechanics (A prospective clinical study)

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...

Canine retraction and anchorage loss Self-ligating versus conventional brackets in a randomized split-mouth study

The Angle Orthodontist, 2014

Objective: To evaluate the velocity of canine retraction, anchorage loss and changes on canine and first molar inclinations using self-ligating and conventional brackets. Materials and Methods: Twenty-five adults with Class I malocclusion and a treatment plan involving extractions of four first premolars were selected for this randomized split-mouth control trial. Patients had either conventional or self-ligating brackets bonded to maxillary canines randomly. Retraction was accomplished using 100-g nickel-titanium closed coil springs, which were reactivated every 4 weeks. Oblique radiographs were taken before and after canine retraction was completed, and the cephalograms were superimposed on stable structures of the maxilla. Cephalometric points were digitized twice by a blinded operator for error control, and the following landmarks were collected: canine cusp and apex horizontal changes, molar cusp and apex horizontal changes, and angulation changes in canines and molars. The blinded data, which were normally distributed, were analyzed through paired t-tests for group differences. Results: No differences were found between the two groups for all variables tested. Conclusions: Both brackets showed the same velocity of canine retraction and loss of anteroposterior anchorage of the molars. No changes were found between brackets regarding the inclination of canines and first molars. (Angle Orthod. 0000;00:000-000.)

Load system of segmental T-loops for canine retraction

American Journal of Orthodontics and Dentofacial Orthopedics, 2013

Objectives-The orthodontic load system, especially the ideal moment-to-force ratios (M/F), is the commonly used design parameter of segmental T-loops for canine retraction. However, the load system, including M/F, may be affected by the changes in canine angulations and interbracket distance (IBD). Here, we hypothesize that clinical changes in canine position and angulation during canine retraction will significantly affect the load system delivered to the tooth. Methods-The load systems of two T-loop groups, one for translation (TR) and the other for controlled tipping (CT), from nine bilateral canine retraction patients were made to the targeted values obtained from finite element analyses and validated. Each loop was tested on the corresponding maxillary dental cast obtained in the clinic. The casts were made before and after each treatment interval so that both initial and residual load systems could be obtained. The preand post-treatment IBDs were recorded for calculating IBD changes. Results-As the IBDs decreased, the averaged retraction-force-drop per IBD reduction was 36 cN/mm, a 30% drop per 1 mm IBD decrease. The averaged anti-tipping-moment-drops per IBD reductions were 0.02 N-mm/mm for CT and 1.4 N-mm/mm for TR, ~0.6 % and 17% drop per 1 mm IBD decrease, respectively. Consequently, the average M/F increases per 1 mm IBD reduction were 1.24 mm/mm for CT and 6.34 mm/mm for TR. There was significant residual load left, which could continue to move the tooth if the patient missed the scheduled appointment. Conclusions-Clinical changes in canine position and angulation during canine retraction significantly affect the load system. The initial planned M/F needs to be lower to reach the expected average ideal value. Patients should be required to follow the office visit schedule closely to avoid negative effects due to significant M/F increases with time.

Comparison of anchorage loss between conventional and self-ligating brackets during canine retraction – A systematic review and meta-analysis

International Orthodontics, 2019

Introduction > Anchorage is defined as the resistance to unwanted tooth movement. In orthodontics, loss of anchorage can be detrimental to treatment. The proponents of orthodontic self-ligating brackets (SLB) advocate the use of extremely light forces thereby reducing anchorage burden. Therefore, the aim of this study was to compare anchorage loss during canine retraction between conventional brackets (CB) and self-ligating brackets. Methods > An electronic search was conducted on the Cochrane database, Scopus, Web of Science, PubMed, Dental & Oral Science and CINAHL, along with handsearching Google Scholar and clinicaltrials.gov. Randomized or non-randomized clinical trials published in the English language on human subjects were included. Orthodontic patients undergoing canine retraction after premolar extraction bonded with self-ligating brackets as the intervention and conventional brackets as the control group in a split mouth design were included. Primary outcome studied was anchorage loss; secondary outcomes were retraction velocity and total amount of canine retraction. Two researchers carried out data extraction and study selection independently. The risk of bias was calculated using the Cochrane's Risk of Bias Assessment tool. The RevMan software was used for quantitative synthesis of data. Effect estimate of the primary and secondary outcomes was expressed using weighted mean difference and 95% confidence intervals (CIs). Heterogeneity of the studies was evaluated using the Cochrane's test for heterogeneity (I 2 Test); subgroup and sensitivity analyses were performed to investigate sources of heterogeneity among the studies. Results > Results of the literature search across all databases yielded 10,439 hits, out of which five studies were included in the qualitative synthesis that met the inclusion criteria. Four studies were randomized control trials (RCTs) where as one was a non-randomized control trial, with 100 subjects included in this systematic review. All studies used a split mouth design. Of the five studies included, only one reported significant differences between CB and SLB for anchorage loss, retraction velocity and total amount of canine retraction (P-value 0.001). Four studies were included in the meta-analysis, which showed no difference in the amount of anchorage between To cite this article: Malik DES, et al. Comparison of anchorage loss between conventional and self-ligating brackets during canine retraction-A systematic review and meta-analysis. International Orthodontics (2019),

A comparison of lower canine retraction and loss of anchorage between conventional and self-ligating brackets: a single-center randomized split-mouth controlled trial

Clinical oral investigations, 2016

To evaluate the rate of lower canine retraction, anchorage loss, and changes on lower canines and first molars axial inclination using self-ligating and conventional brackets. Twenty-five adult patients with a treatment plan involving extractions of four first premolars were selected for this split-mouth trial and had either conventional or self-ligating brackets bonded to lower canines in a block randomization. Retraction was accomplished using 100-g nickel titanium closed-coil springs, which were reactivated each 4 weeks. Oblique radiographs were taken before and after total canine retraction and the cephalograms were superimposed on stable structures of the mandible. Cephalometric points were digitized twice by a single-blinded operator for error control and the average of the points were used to determine the following variables: canine cusp horizontal changes, molar cusp horizontal changes, and angulation changes in canines and molars. Paired t tests were used to analyze the bl...

Effect of extraction technique on the rate of canine retraction: a split-mouth study

Egyptian Orthodontic Journal, 2019

The method of tooth extraction may affect amount of bone and thus may affect orthodontic tooth movement. Materials and Methods:This study is a split mouth clinical trial. A total of 14 female patients were enrolled in the study. Following the leveling and alignment stage, the patient was sent for extraction either with conventional forceps way for one side and the other side with the aid of the Piezotome. Results:The average rate of canine retraction for the four months of the study and the total amount of canine retraction weren't significant. Regarding marginal bone loss,in control side (forceps extraction side) mean marginal bone loss was found to be 0.07 mm (+_ 0.1). In the piezotome side mean marginal bone loss was found to be 5.8 mm (0.23).The difference between two sides was statistically significant (p<0.05). Conclusions:The method of teeth extraction didn't affect the rate of canine retraction into the extraction socket. Piezotome was believed to produce more atraumatic extraction, however the amount of marginal bone loss was significantly greater compared to the conventional forceps extraction method.