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 Comparison of force decay pattern in orthodontic elastomeric chains and NiTi closed coil springs, affected by five different mouthwashes: An in vitro Study

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Amir Hossein Mirhashemi ◽  
Niloofar Habibi Khameneh ◽  
Keyvan Shahpoorzadeh ◽  
Atefe Saffar Shahroudi
Keyword(s):  
Reduction Rate ◽  
In Vitro Study ◽  
Vitro Study ◽  
Control Group ◽  
Force Decay ◽  
Decay Pattern ◽  
Force Reduction ◽  
Initial Force ◽  
Elastomeric Chains

Background: The aim of this study was to compare the force decay pattern of elastomeric chains and NiTi coil springs which were exposed to five different commercially available mouthwashes.Methods: In this in vitro study, 60 pieces of elastomeric chain (EC) and 60 NiTi closed coil springs (CS) were divided into 6 groups. The specimens were exposed to one of these mouthwashes twice a day for 60 seconds:  Listerine, chlorhexidine, Orthokin, Persica, fluoride and artificial saliva as the control group. The elastomeric chains and NiTi springs were stretched so that they exert the initial force of 250 gr. Their force was measured on the 1, 7, 14 and 28 following days by means of a digital gauge.Results: Elastomeric chains and coil springs had force decrease over time, but EC' force reduction was greater with the highest reduction rate in the first week. However, in the CS group, the force decrease wasn't statistically significant in the first two weeks.  After 28 days in the control groups, 49.8% of the initial force was remained in ECs while the value was 93.3% for CSs. In comparison between mouthwashes, in EC groups, in all mouthwashes except Persica, the remained force was statistically less than control group.Conclusion: Force degradation of elastomeric chains could be exacerbated by use of mouthwashes. About coil springs, force decay was also observed. However, it was not statistically significant. Force reduction was detectable after four weeks of coil springs usage, but in EC groups, the greatest reduction was after the first week.  

scholarly journals Comparative evaluation of force decay pattern in orthodontic active tiebacks exposed to five different mouth rinses: An in vitro Study

2020 ◽  
Vol 14 (4) ◽  
pp. 244-249
Author(s):  
Amir Hossein Mirhashemi ◽  
Atefe Saffar Shahroudi ◽  
Keyvan Shahpoorzadeh ◽  
Niloofar Habibi Khameneh
Keyword(s):  
In Vitro Study ◽  
Vitro Study ◽  
Control Group ◽  
Mouth Rinses ◽  
Force Decay ◽  
Force Relaxation ◽  
Decay Pattern ◽  
Initial Force ◽  
And Control

Background. This study compared the force decay pattern of two different orthodontic active tiebacks (ATBs) exposed to five different commercially available mouth rinses. Methods. In this in vitro study, 90 transparent ATBs and 90 gray ATBs were divided into six groups; one was the control group, and the others were exposed to one of these mouth rinses twice a day for 60 seconds: Listerine, chlorhexidine, Orthokin, Persica, and fluoride. The initial force of each ATB was 250 g at a 24-mm extension. The force of ATBs was measured on days 1, 7, 14, and 28 using a digital gauge. Results. The highest percentage of force loss was observed between days 14 and 28 (P<0.05). At the end of the study, the Persica group exhibited the highest force degradation in both ATB types. In the transparent ATBs, it was followed by Orthokin, Listerine, fluoride, chlorhexidine, and control groups, respectively. In the gray ATBs, Orthokin, chlorhexidine, control, Listerine, and fluoride groups exhibited the highest force decay in descending order. In some groups, the differences between transparent and gray ATBs were significant. In the control group, the force of transparent ATB was significantly higher than gray ones on days 7 and 14 but not significantly after four weeks. Conclusion. ATBs’ force degradation could be exacerbated by the use of some mouth rinses. There were some differences between force relaxation patterns of transparent and gray ATBs. The data could be beneficial in choosing appropriate O-rings for making ATBs.

scholarly journals Force Decay Characteristics of commonly used Elastomeric Chains on Exposure to various Mouth Rinses with different Alcohol Concentration: An in vitro Study

2017 ◽  
Vol 18 (9) ◽  
pp. 812-820
Author(s):  
M Mohamed Ramees ◽  
Esther A Abraham ◽  
KK Manjusha ◽  
A Nishad ◽  
S Ramachandraiah
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Total Sample ◽  
Alcohol Concentration ◽  
Alcohol Mixture ◽  
Mouth Rinses ◽  
Force Decay ◽  
The Difference ◽  
Elastomeric Chains

ABSTRACT Aim The aim of this study was to test the effect of varying alcohol concentrations of various commercially available mouthwashes on force decay of elastomeric chains in prestretched and unstretched condition. Materials and methods A total of five specimen groups were tested with a total sample size of 180 specimens. A specimen is described as a three-link, short module, clear elastomeric chain (3M Unitek, Ortho Plus, Ortho Organizer). The control and test groups were independently submerged in separate 37°C artificial saliva to simulate the oral conditions. Effects of different solution groups and time (initial, 1, 7, 14, 21, and 28 days) on three different elastomeric chains and force (cN) are analyzed with two-way analysis of variance; pair-wise comparisons are done by t-test. Results Higher mean force was recorded initially followed by 24 hours >7 days >14 days >21 days and 28 days respectively. The difference in mean force decay among the different time intervals was found to be statistically significant (p < 0.001). Among the different solutions, higher mean force was recorded in 21.6% alcohol mixture > Listerine 8.38% > Wokadine > alcohol mixture 8.38% > artificial saliva. Conclusion In conclusion, alcohol-containing mouth rinses cause an increase in force decay of elastomeric chain over time. Clinical significance These mouth rinses are commonly recommended during orthodontic treatment. The orthodontist can know better that the alcohol content of the mouth rinses and the structural and molecular modification results in the decay of elastomeric chain. How to cite this article Ramachandraiah S, Sridharan K, Nishad A, Manjusha KK, Abraham EA, Ramees MM. Force Decay Characteristics of commonly used Elastomeric Chains on Exposure to various Mouth Rinses with different Alcohol Concentration: An in vitro Study. J Contemp Dent Pract 2017;18(9):812-820.

scholarly journals Evaluation of degradation of force of esthetic elastomeric chains

2019 ◽  
Vol 48 ◽  
Author(s):  
Mayra Teixeira Cortat LUCINDO ◽  
Diego Patrik Alves CARNEIRO ◽  
Felipe Alexandre de SOUZA ◽  
Américo Bortolazzo CORRER ◽  
Heloisa Cristina VALDRIGHI
Keyword(s):  
Repeated Measures ◽  
Artificial Saliva ◽  
In Vitro Study ◽  
Time Interval ◽  
Test Machine ◽  
Reduction In Force ◽  
Original Length ◽  
The Aesthetic ◽  
Elastomeric Chains

Abstract Introduction Elastomers are considered important allies to orthodontic treatment and due to the aesthetic demand, aesthetic elastomers are increasingly used in adult patients. Objective The aim of this experimental in vitro study was to evaluate the degradation of force of esthetic elastomeric chains, of three different sizes: short, medium and long. Material and method For evaluating the degradation of force, 90 elastomeric chain segments were used, divided into 9 Groups (n=10), as follows: Morelli short elastomer, Morelli medium, Morelli long, Orthometric short, Orthometric medium, Orthometric long, American Orthodontic short, American Orthodontic medium and American Orthodontic long. Acrylic plates with pins were used to provide stretching of the elastomeric chains. The initial stretching force of the elastomeric chain was 150 grams, measured by a tensiometer. After this, they were prestretched to 50% of their original length, measured in an Instron 4411 Universal test machine, and placed on the seating pin on the plate. The plate was immersed in artificial saliva at 37 °C in a plastic receptacle, and removed for measurement after a time interval of 21 days. For statistical analysis, the methodology of mixed models for repeated measures in time and Tukey-Kramer test were used. Degradation of the forces was analyzed by 2-way analysis of variance (ANOVA) and the Tukey test. Result All the elastomeric chains showed statistically significant reduction in force (p<0.05). The American Orthodontic elastomeric chains showed higher reduction in force values, irrespective of the elastic size (p<0.05). Conclusion The three commercial brands studied underwent significant reduction in the quantity of force released; the American Orthodontic brand of elastomer showed the highest value of degradation in force.

Elastomeric chain force decay in artificial saliva: An in vitro study

2013 ◽  
Vol 11 (1) ◽  
pp. 60-70 ◽  
Author(s):  
Abdelali Halimi ◽  
Mohamed-Faouzi Azeroual ◽  
Anas Doukkali ◽  
Khalid El Mabrouk ◽  
Fatima Zaoui
Keyword(s):  
Artificial Saliva ◽  
In Vitro Study ◽  
Vitro Study ◽  
Force Decay ◽  
Chain Force

scholarly journals Avaliação da Diminuição da Força de Ativação de Elásticos Correntes de Diferentes Cores: Estudo in Vitro

2020 ◽  
Vol 24 (4) ◽  
pp. 396-401
Author(s):  
Larissa Gomes ◽  
Renata Almeida-Pedrin ◽  
Victor Ladewig ◽  
Victor Didier ◽  
Joel Santiago ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Statistical Tests ◽  
Significance Level ◽  
Oral Environment ◽  
The Mean ◽  
The Difference ◽  
Continuous Use ◽  
Elastomeric Chains ◽  
Calculated Analysis

O objetivo deste estudo consistiu em comparar a degradação de força de cinco cores diferentes de elásticos corrente, a fim de buscar parâmetros clínicos para o uso desses elásticos nas terapias ortodônticas. Foram avaliados 10 segmentos com 6 elos de elásticos corrente de força média da marca Morelli, das cores preto, cinza, azul, rosa e transparente, provenientes de embalagens seladas e dentro do prazo de validade. Os elásticos foram distendidos até o dobro de seu comprimento e mantidos por dispositivos simples com duas pontas de metal, simulando o uso contínuo dos elásticos por parte dos pacientes. Esses dispositivos foram submersos em saliva artificial a 370C dentro de recipientes mantidos em estufa.  As forças dos segmentos de elásticos foram mensuradas com um dinamômetro ortodôntico de precisão ao início e nos intervalos de 1, 7,14, 21 e 30 dias após a imersão, e a média de força para cada grupo e tempo foi calculada. A Análise de variância (ANOVA) a dois critérios (tempo e grupos) e o teste de Tukey foram utilizados para a análise dos dados. Em todos os testes estatísticos foi adotado um nível de significância de 5%. Todas as cores de elásticos degradaram com o tempo, sendo a porcentagem média de degradação após 1 dia de 40,4%; 7 dias 48,2%; 14 dias 56,8%; 21 dias 65% e 81% após 30 dias. Entretanto, há diferença de degradação de força entre as cores dos elásticos. Os elásticos Transparente e Azul apresentaram menor degradação da força, sendo que após 30 dias o elástico Transparente se mostrou mais efetivo, seguido do Azul, Cinza, Preto e Rosa. Mesmo com a diferença na degradação de força entre as cores dos elásticos, esses dados não apresentam relevância clínica se utilizados por até 14 dias, após esse período seria melhor a utilização do elástico Transparente.   Palavras-chave: Ortodontia. Látex. Elasticidade   Abstract The aim of this study was to compare the force degradation of five different colors of elastomeric chains, in order to achieve clinical parameters for the use of these elastics in orthodontic therapies. The sample was composed by 10 segments with 6 links (medium force) for each color of elastomeric chain (Morelli); black, gray, blue, pink and transparent, from sealed packages and within the expiration date. The elastics were stretched twice their length and maintained by simple devices with two metal tips, simulating the continuous use of the elastics by the patients. These devices were submerged in artificial saliva at 370C to simulate the oral environment. The  elastic segments strengths were measured with a precision orthodontic dynamometer at the beginning and at intervals of 1, 7, 14, 21 and 30 days after immersion, and the mean strength for each group and time was calculated. Analysis of variance (ANOVA) with two criteria (time and groups) and the Tukey test were used for data analysis. In all statistical tests, a significance level of 5% was adopted. All the  elastics colors degraded over time, with the average  degradation percentage after 1 day being 40.4%; 7 days 48.2%; 14 days 56.8%; 21 days 65% and 81% after 30 days. However, there is a difference in force degradation among the  elastics colors. The Transparent and Blue elastics showed less force degradation, and after 30 days the Transparent elastic was more effective, followed by Blue, Gray, Black and Pink. Even with the difference in force degradation among the  elastics colors, these data are not clinically relevant they are used for up to 14 days, after that period it would be better to use the Transparent elastic.   Keywords: Orthodontics. Latex. Elasticity

scholarly journals Influence of Exposing Root Canal Dentin to Calcium Hydroxide on Its Flexural Strength

2015 ◽  
Vol 1 (3) ◽  
pp. 143
Author(s):  
Diatri Nari Ratih
Keyword(s):  
Flexural Strength ◽  
Calcium Hydroxide ◽  
Root Canal ◽  
Artificial Saliva ◽  
Testing Machine ◽  
In Vitro Study ◽  
Control Group ◽  
Sterile Saline ◽  
Root Canal Dentin

Calcium hydroxide has been used extensively in endodontic treatments, for instance as an intra-canal dressing; however, the exposure of root canal dentin to calcium hydroxide may affect its flexural strength and could have important clinical implications for endodontic treatment. The purpose of this in vitro study was to investigate the influence of calcium hydroxide on the flexural strength of root canal dentin.Seventy-two extracted single-rooted human mandibular premolars were used in this study. Each tooth was instrumented using crown-down technique and was irrigated using sterile saline. The teeth were assigned into three groups of 24 each. The prepared root canal system of each tooth was filled with calcium hydroxide mixed with sterile saline (group 1), a calcium hydroxide commercially available product (UltraCal®) (group 2) or saline solution (group 3, as control). The apices and access opening were sealed using composite resin, and the teeth were immersed in artificial saliva. After 7, 14 and 30 days of immersion, the inner root canal dentin of 8 teeth respectively from each group were sectioned to create dentin bars (1 X 1 mm, with 7 mm in length). Each dentin bar then was subjected to a three-point bending flexural test using MTS (Universal Testing Machine). Data gathered were then analyzed using two-way ANOVA, followed by Tukey’s test with the level of significance of 95%. The results showed that exposure to calcium hydroxide either using calcium hydroxide mixed with sterile saline or UltraCal® for 14 and 30 days can reduce flexural strength of root canal dentin compared to control group (p<0.05). In contrast, after 7 days exposure, there was no significantly different of flexural strength between three groups (p>0.05).   It can be concluded that calcium hydroxide reduced the flexural strength of root canal dentin. The longer the exposure to calcium hydroxide would produce a greater effect on flexural strength of root canal dentin.   

scholarly journals Evaluation of The Erosive Potential of Soft Drinks

2007 ◽  
Vol 01 (01) ◽  
pp. 010-013 ◽  
Author(s):  
Sílvia Helena de Carvalho Sales-Peres ◽  
Ana Carolina Magalhães ◽  
Maria Aparecida de Andrade Moreira Machado ◽  
Marília Afonso Rabelo Buzalaf
Keyword(s):  
Artificial Saliva ◽  
Dental Enamel ◽  
In Vitro Study ◽  
Glass Electrode ◽  
Buffering Capacity ◽  
Soft Drinks ◽  
Enamel Erosion ◽  
The Mean ◽  
Bovine Enamel

ABSTRACTObjectives: This in vitro study evaluated the capability of different soft drinks (Coca-Cola® -C, Coca- Cola Light® -CL, Guaraná® -G, Pepsi Twist® -P and Sprite Light® -SL) to erode dental enamel, relating the percentage of superficial microhardness change (%SMHC) to concentrations of fluoride and phosphate, buffering capacity and pH of these drinks.Methods: The soft drinks were evaluated in respect to concentration of phosphate and fluoride spectrophotometrically using Fiske, Subarrow method and by specific electrode (Orion 9609), respectively. The pH and the buffering capacity were determined by glass electrode and by estimating of the volume of NaOH necessary to change the pH of the drink in one unit, respectively. One hundred specimens of bovine enamel were randomly assigned to 5 groups of 20 each. They were exposed to 4 cycles of demineralisation in the beverage and remineralisation in artificial saliva. The softening of enamel was evaluated by %SMHC.Results: The mean %SMHC was:C=77.27%, CL= 72.45%, SL=78.43%, G=66.65% and P=67.95%. Comparing the %SMHC promoted by 5 soft drinks, SL = C > CL > P = G (P<.05). There was not significant correlation between %SMHC and the other variables tested for the five drinks (P>>.05)Conclusions: The five soft drinks caused surface softening of enamel (erosion). In respect to the chemical variables tested, despite not statistically significant, the pH seems to have more influence on the erosive potential of these drinks. (Eur J Dent 2007;1:10-13)

Force decay of intermaxillary orthodontic elastics: in vitro study

2019 ◽  
Vol 88 (2) ◽  
pp. 91-95
Author(s):  
Hubert Kardach ◽  
Aneta Olszewska ◽  
Ewa Firlej ◽  
Agnieszka Bogdanowicz ◽  
Ewelina Golusińska-Kardach ◽  
...  
Keyword(s):  
Artificial Saliva ◽  
Low Cost ◽  
In Vitro Study ◽  
Ease Of Use ◽  
Force Decay ◽  
Artificial Environment ◽  
Negative Effect ◽  
Progressive Force ◽  
Different Diameters

Introduction. Orthodontic elastics are widely used in orthodontic treatment. It’s been proved that they have advantages such as low cost, ease of use, but also disadvantages, mainly force decay in time and increased entrapment of biofilm. Amount of the force is of extreme significance. This force can be altered by physical or chemical factors. Material and Methods. Latex elastics in 3 different diameters were selected for this study. Each elastic was stretched and placed on hooks that are at specified distances that equal 3 times the diameter of each elastic. The forces produced by stretching was measured using tension gauge and the measurement were taken at specific time intervals of 0h, 3h, 12h, 24h. The same process was repeated for elastics in dry and artificial environment. Results. Elastics in the dry environment showed progressive force decay cause by stretching over time. Just after 3 hours force decay between 6,07% and 8,75% was observed. The biggest loss of force between 13,61 — 16,13 % was measured after 24 hours. Compared to the dry environment, an even more significant force decay was observed in the artificial saliva. After first 3 hours force loss was between 4,99% — 9,22%. The biggest force decay was observed after 24 hours and it was 5 % higher compared to dry environment. Conclusions. 1) The artificial saliva environment and time of exposure to it, have a negative effect on the properties of elastomeric. 2) To maintain the effective orthodontic strength of elastics, they should be replaced every 12 hours.

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