Canine and molar movement, rotation and tipping by NiTi coils versus elastomeric chains in first maxillary premolar extraction orthodontic adolescents: A randomized split-mouth study

2021 ◽  
Author(s):  
Haleh Hashemzadeh ◽  
Milad Soleimani ◽  
Mona Golbar ◽  
Anahita Dehghani Soltani ◽  
Seyedeh Pegah Mirmalek
Keyword(s):  
Premolar Extraction ◽  
Elastomeric Chains

scholarly journals Comprehensive comparison of canine retraction using NiTi closed coil springs vs elastomeric chains:

2021 ◽  
Author(s):  
Haya A. Barsoum ◽  
Hend S. ElSayed ◽  
Fouad A. El Sharaby ◽  
Juan Martin Palomo ◽  
Yehya A. Mostafa
Keyword(s):  
Root Resorption ◽  
Controlled Trial ◽  
Pain Experience ◽  
Premolar Extraction ◽  
Canine Retraction ◽  
Significant Difference ◽  
Computed Tomography Scans ◽  
Comprehensive Comparison ◽  
Maxilla And Mandible ◽  
Elastomeric Chains

ABSTRACT Objectives To compare canine retraction using NiTi closed coil springs vs elastomeric chains comprehensively in a split-mouth randomized controlled trial. Materials and Methods The canines in 64 quadrants were randomly retracted into the first premolar extraction spaces using NiTi closed coil springs or elastomeric chains, in the maxilla and mandible. The retraction force was 150 g. Cone beam computed tomography scans and study models were obtained before the start of canine retraction and 6 months later. The rate and total amount of canine retraction, canine rotation, tipping, and root resorption were evaluated. A visual analogue scale was used to evaluate patients' pain experience. Results The two methods were statistically similar for dental changes, rate of canine retraction, and root resorption. However, patients reported significantly more days of pain with the elastomeric chain compared to the NiTi closed coil springs. Conclusions Within the constraints of the current study, using either NiTi closed coil springs or elastomeric chains as force delivery systems for canine retraction results in no significant difference in the rate of canine retraction, tipping, rotation, or root resorption. Pain experience during retraction using elastomeric chains is more significant yet needs further investigation.

Relaxation of Orthodontic Elastomeric Chains and Modules In Vitro and In Vivo

1978 ◽  
Vol 57 (5-6) ◽  
pp. 685-690 ◽  
Author(s):  
J.L. Ash ◽  
R.J. Nikolai
Keyword(s):  
Water Bath ◽  
Dry Air ◽  
Initial Activation ◽  
Elastomeric Chains

Relaxation patterns for two orthodontic polyurethane-based elastics have been quantified in dry air and water bath environments and in vivo. Water bath simulation of in vivo behavior is apparently valid for up to a week following initial activation, but it becomes somewhat erroneous thereafter.

Postretention relapse of mandibular anterior crowding in patients treated without mandibular premolar extraction

2004 ◽  
Vol 125 (4) ◽  
pp. 480-487 ◽  
Author(s):  
Karina M.S Freitas ◽  
Marcos Roberto de Freitas ◽  
José Fernando Castanha Henriques ◽  
Arnaldo Pinzan ◽  
Guilherme Janson
Keyword(s):  
Anterior Crowding ◽  
Premolar Extraction

scholarly journals Experimental Study on Strength Evaluation Applied for Teeth Extraction: An In Vivo Study

2013 ◽  
Vol 7 (1) ◽  
pp. 20-26 ◽  
Author(s):  
Marco Cicciù ◽  
Ennio Bramanti ◽  
Fabrizio Signorino ◽  
Alessandra Cicciù ◽  
Francesco Sortino
Keyword(s):  
Strain Measurement ◽  
In Vivo Study ◽  
Microsoft Excel ◽  
Premolar Extraction ◽  
Lower Jaw ◽  
System Data ◽  
Computerized System ◽  
Teeth Extraction

Purpose: The aim of this work was to analyse all the applied movements when extracting healthy upper and lower jaw premolars for orthodontic purposes. The authors wanted to demonstrate that the different bone densities of the mandible and maxilla are not a significant parameter when related to the extraction force applied. The buccal and palatal rocking movements, plus the twisting movements were also measured in this in-vivo study during premolar extraction for orthodontic purposes. Methods: The physical strains or forces transferred onto the teeth during extraction are the following three movements: gripping, twisting, and traction. A strain measurement gauge was attached onto an ordinary dentistry plier. The strain measurement gauge was constituted with an extensimetric washer with three 45º grids. The system operation was correlated to the variation of electrical resistance. Results: The variations of resistance (∆R) and all the different forces applied to the teeth (∆V) were recorded by a computerized system. Data results were processed through Microsoft Excel. The results underlined the stress distribution on the extracted teeth during gripping, twisting and flexion. Conclusions: The obtained data showed that the strength required to effect teeth extraction is not influenced by the quality of the bone but is instead influenced by the shape of the tooth’s root.

scholarly journals An in vitro comparison of the force decay generated by different commercially available elastomeric chains and NiTi closed coil springs

2007 ◽  
Vol 21 (1) ◽  
pp. 51-57 ◽  
Author(s):  
Ana Cristina Soares Santos ◽  
André Tortamano ◽  
Sandra Regina Frazatto Naccarato ◽  
Gladys Cristina Dominguez-Rodriguez ◽  
Julio Wilson Vigorito
Keyword(s):  
Artificial Saliva ◽  
Testing Machine ◽  
In Vitro Study ◽  
Original Length ◽  
Force Decay ◽  
Decay Pattern ◽  
The Mean ◽  
Initial Force ◽  
Elastomeric Chains

This in vitro study was designed to compare the forces generated by commercially available elastomeric chains and NiTi closed coil springs, and to determine their force decay pattern. Forty elastomeric chains and forty NiTi closed coil springs were divided into 4 groups according to the following manufacturers: (1) Morelli®, (2) Abzil®, (3) TP Orthodontics® and (4) American Orthodontics®. The specimens were extended to twice their original length and stored in artificial saliva at 37°C. Initial force was measured by means of an Instron universal testing machine and then at 1, 4, 7, 14, 21, and 28 days. The results revealed that the elastomeric chains delivered a mean initial force of 347 g for Morelli®, 351 g for American Orthodontics®, 402 g for Abzil®, and 404 g for TP Orthodontics®. The NiTi closed coil springs generated a mean initial force of 196 g for American Orthodontics®, 208 g for TP Orthodontics®, 216 g for Abzil®, and 223 g for Morelli®. The mean percentage of force decay observed after 28 days for the elastomeric chains was 37.4% for TP Orthodontics®, 48.1% for American Orthodontics®, 65.4% for Morelli®, and 71.6% for Abzil®. After 28 days, the NiTi closed coil springs presented a mean percentage of force decay of 22.6% for American Orthodontics®, 29.8% for Abzil®, 30.6% for Morelli®, and 45.8% for TP Orthodontics®. At the end of the study, significant differences were observed between the elastomeric chains and the NiTi closed coil springs. The results indicated that the studied NiTi closed coil springs are more adequate for dental movement than the elastomeric chains.

scholarly journals Dentoskeletal and soft tissue changes associated with miniscrew anchorage in customized lingual orthodontics

2018 ◽  
Vol 47 (1) ◽  
pp. 84-95
Author(s):  
Dawei Liu ◽  
Jing Li ◽  
Feifei Lei ◽  
Xuedong Wang ◽  
Yanheng Zhou
Keyword(s):  
Soft Tissue ◽  
Clinical Effectiveness ◽  
Upper Lip ◽  
Lingual Orthodontics ◽  
Premolar Extraction ◽  
Anterior Teeth ◽  
Mandibular Plane ◽  
Space Closure ◽  
Tissue Changes ◽  
Soft Tissue Changes

Objectives The goal of this study was to analyze skeletal, dental, and soft tissue changes of patients treated with customized lingual systems and to evaluate the clinical effectiveness of miniscrew anchorage. Methods Nine upper first premolar extraction patients who were treated with customized lingual appliances were included in this study. Miniscrews were used for reinforcement of molar anchorage. Cephalometric films and study models were obtained before treatment (T1), after alignment (T2), and after treatment (T3). Treatment effects were analyzed by cephalometric radiographs and study models. Results The upper anterior teeth were retracted significantly at T2 and T3 (4.41 ± 4.14 mm and 5.51 ± 2.48 mm, respectively). During space closure, the upper first molars showed slight mesial movement (1.50 ± 1.97 mm). The intercanine width of the upper arch increased at T2 (1.59 ± 1.81 mm), but decreased at T3 (0.11 ± 1.00 mm). The sella-nasion-A, A-nasion-B, and mandibular plane angles were not significantly changed at T3. The upper lip showed continuous retraction at both T2 and T3 (1.40 ± 1.46 mm and 2.32 ± 2.48 mm, respectively). Conclusions By using miniscrew anchorage for lingual orthodontics, patients’ dental and soft tissue changes considerably improved and molar anchorage was reinforced.

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