Determination of the force systems produced by different configurations of tear drop orthodontic loops

Thiesen, Guilherme; Shimizu, Roberto Hideo; Valle, Caio Vinícius Martins do; Valle-Corotti, Karyna Martins do; Pereira, Jefferson Ricardo; Conti, Paulo César Rodrigues

doi:10.1590/s2176-94512013000200007

Cited by 10 publications

(19 citation statements)

References 17 publications

(20 reference statements)

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“…Beta titanium is less stiff than stainless steel which has been demonstrated by numerous studies. 6,[9][10][11][12][13] The 0.019" × 0.025" wire dimensions produced more force and load deflection rate than 0.017" × 0.025" (Tables 3 and 4, Graph 1). The 0.019" × 0.025" produced approximately 1.4 times more force than 0.017" × 0.025" wire dimensions.…”

Section: Discussionmentioning

confidence: 99%

Comparative Evaluation of the Force and Load Deflection Rate for Different Loop Springs with Varying Designs, Wire Dimensions, and Materials: A Finite Element Method Study

Jadhav

Krishnan

Patni

et al. 2019

J Indian Orthod Soc

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Objective: To evaluate and compare the force and load deflection rate generated by differing unit displacement through 1 to 4 mm of springs that vary in design (Double Delta Closing Loop, Double Vertical T Crossed Closing Loop, Double Vertical Helical Closing Loop and Ricketts Maxillary Retractor), constituting wire materials (stainless steel and beta titanium), and wire dimensions (0.017" × 0.025" and 0.019" × 0.025"). Materials and methods: Computer-assisted design (CAD) model of the said loop springs was created and converted to the finite element method (FEM). The boundary conditions assigned were restraining anterior segment of the loops in all the 3 axes and displacement of the posterior segment progressively only along the x-axis in increments of 1, 2, 3, and 4 mm. Force and load deflection rate were calculated for each incremental displacement. Results: For all loop designs, force and load deflection rate increased with incremental displacement. Loop springs of beta titanium and 0.017" × 0.025" dimension showed lesser force and load deflection rate than those of stainless steel and 0.019" × 0.025", respectively. Ricketts Maxillary Retractor showed the least force and load deflection rate. Comparable force and load deflection values were found for 0.017" × 0.025" Double Vertical T Crossed Loop and 0.019" × 0.025" Double Vertical Helical Closing Loop. Conclusions: Variations in wire dimensions, materials, and designs have a profound effect on force and load deflection rate of the different loop springs studied.

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Section: Discussionmentioning

confidence: 99%

Comparative Evaluation of the Force and Load Deflection Rate for Different Loop Springs with Varying Designs, Wire Dimensions, and Materials: A Finite Element Method Study

Jadhav

Krishnan

Patni

et al. 2019

J Indian Orthod Soc

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“…Dve osnovne tehnike koje se razlikuju po biomehanici su mehanizam omči za zatvaranje prostora i klizni mehanizam [8]. Omče su inkorporirane u dizajn žičanog luka i imaju ulogu da preko njega prenesu silu koja dovodi do zatvaranja prostora bez pojave trenja [9]. Sanjay i saradnici navode da zatvaranje postekstrakcionih prostora bez pojave trenja, pri čemu se proizvode kontinuirane sile, predstavlja najveću prednost omči [10].…”

Section: Kratak Sadržajunclassified

“…There are various techniques for carrying out this clinical procedure, and proper selection can affect the outcome of the treatment. Two basic techniques that differ in biomechanics are closing loops and sliding mechanics [8].Closing loops are incorporated into the archwire design and transmit force over it to close the space without any friction [9]. Sanjay et al stated that the closure of postextraction spaces without friction, while producing continuous forces, was the biggest advantage of a loop [10].…”

Section: Introductionmentioning

confidence: 99%

Examination of postextraction space closure speed using elastic chains and NiTi closed coil springs

Umićević-Davidović¹,

Arapović-Savić²,

Arbutina³

2018

Serbian Dental Journal

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Summary Introduction In everyday clinical practice, we often encounter a lack of space for placing all the teeth present into dental arch; therefore it is often recommended to extract teeth within orthodontic treatment. In clinical practice, the most commonly used methods of closing space after are elastic chains and NiTi closed spiral springs. The aim of this paper was to compare postextraction space closure speed using two different sliding mechanisms, NiTi closed coil springs and elastic chains within treatment with fixed orthodontic appliances. Material and Method The total sample in this study consisted of 46 postexstraction spaces in 23 patients indicated for the extraction of first premolars using treatment with fixed orthodontic appliances. Two sliding mechanisms, NiTi closed coil spring and elastic chains were applied to postextraction space closure. Postextraction spaces were monitored for 4 months with appointments every 4 weeks. During appointments mechanisms were activated and digital caliper was used to measure the width of the postextraction space. Results The results showed that NiTi closed coil springs method achieved greater reduction in postexstraction space (3.94 mm) while with elastic chain method the closure of 3.10 mm was achieved. The total difference between these two methods in the observed period was 0.84mm and no statistically significant difference was found (p> 0.05). The lowest value for NiTi closed springs was 2.19 mm, while for the elastic chain it was 1.29 mm. The best postextraction space closure was 5.70 mm and it was completed using NiTi closed springs while for elastic chain the best value was 4.80 mm. Conclusion: NiTi closed coil springs lead to faster closure of postextraction spaces in relation to elastic chain. Since this difference is minimal, in practice, both methods can be used equally.

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“…Additionally, it produces lighter forces. 13 , 20 Nevertheless, it is more sensitive in addition to being influenced by factors that hinder sliding of orthodontic archwires, such as friction, less torque control of anterior teeth and overbite. 21 Adding more torque on the orthodontic archwire and using brackets with greater torque are recommended to control tipping of incisors.…”

Section: Final Considerationsmentioning

confidence: 99%

Class I malocclusion with severe double rotrusion treated with first premolars extraction

Moresca

2014

Dental Press J. Orthod.

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Angle Class I malocclusion with bimaxillary protrusion is characterized by severe buccal tipping of incisors, which causes upper and lower lip protrusion. First premolars extraction is recommended to reduce facial convexity as a result of anterior teeth retraction, which keeps canines and first molars in key to occlusion. In order to yield orthodontic results that are compatible with ideal esthetic and cephalometric outcomes, the space closure phase needs to be carried out with overbite and incisors torque control. The majority of cases also requires maximum anchorage of posterior teeth. This case was presented to the Brazilian Board of Orthodontics and Facial Orthopedics (BBO) as a requirement for the title of certified by the BBO.

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Determination of the force systems produced by different configurations of tear drop orthodontic loops

Cited by 10 publications

References 17 publications

Comparative Evaluation of the Force and Load Deflection Rate for Different Loop Springs with Varying Designs, Wire Dimensions, and Materials: A Finite Element Method Study

Comparative Evaluation of the Force and Load Deflection Rate for Different Loop Springs with Varying Designs, Wire Dimensions, and Materials: A Finite Element Method Study

Examination of postextraction space closure speed using elastic chains and NiTi closed coil springs

Class I malocclusion with severe double rotrusion treated with first premolars extraction

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