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      Comparative Assessment of Force Decay of the Elastomeric Chain With the Use of Various Mouth Rinses in Simulated Oral Environment: An In Vitro Study

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          Abstract

          Aim:

          This study is aimed to assess the effect of different mouth rinses and its active components on the force decay of elastomeric chains. Listerine, Colgate Phos-Flur, Clohex Plus mouth rinses, 26.9% alcohol, 0.04% sodium fluoride (NaF), and 0.2% chlorhexidine were used for this study to determine its effects on force decay of elastomeric chains.

          Materials and Methods:

          Seven custom-made jigs were constructed on which 120 short module elastomeric chains were stretched to predetermined lengths between the pins. Using calibrated digital force tester, measurements of force exerted by the elastomeric chains while stretched on the framework were recorded at the time of attachment to the frame and after 24 hours, 7 days, 14 days, 21 days, and 28 days. The custom-made jigs and the elastomeric chains were allowed for complete submersion in artificial saliva throughout the test period, as well as in respective control solution and mouth rinses for 60 seconds, twice daily.

          Results:

          All test groups showed significantly more force decay than the control group. Statistically significant differences were observed when comparing force decay among the test groups except between a few.

          Interpretation and Conclusion:

          Mouth rinses cause an increase in force decay of elastomeric chain over the time. Listerine and 26.9% alcohol solution caused maximum force decay by the end of 28 days. Least force degradation of elastomeric chain was seen with the use of 0.2% chlorhexidine.

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          Most cited references13

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          Force degradation of orthodontic elastomeric chains--a product comparison study.

          In the last 20 years, synthetic elastic modules have been introduced to the orthodontist. However, force decay of these materials has been a clinical problem and the purpose of this project was to evaluate the force decay patterns of three commercially available elastomeric products--Ormco Power Chain II, Rocky Mountain Energy Chain, and TP Elast-O Chain--in a simulated oral environment. Thermal-cycled samples experienced less force decay over a 21-day period than samples stored at 37 degrees C. Furthermore, statistical analysis confirmed that there was a highly significant difference (p less than 0.01) between the mean force exerted by short modules and long modules for each material. Overall, modules producing higher initial forces (short modules) underwent less force decay after 21 days than did modules producing lower initial force values (long modules). All materials exerted 216 to 459 grams of force initially. After 21 days of simulated tooth movement, the force exerted by the elastic modules was 70 to 230 grams--a significant reduction (p less than 0.001).
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            Orthodontic elastic materials.

            A K Wong (1976)
            Latex elastics and synthetic elastomers have certain similarities and differences. In the fracture tests the latex elastics showed a greater amount of loss in strength than plastic elastomers when stretched over a 21 day period. There is a great variability, as much as 50%, in the tensile strength of the plastic materials taken from the same batch and stretched under the same conditions. The Ormco Power Chain was more resilient than the Unitek AlastiK chain. The Unitek AlastiKs had more force and stretched less. The force decay of synthetic elastomers, stretched over a specific length and time, exhibited a great loss in force. This loss could be as great as 73% during the first day. The decay of force continued at a slower rate during the rest of the 21 day period. Unitek AlastiK C2 double links, when stretched 17 millimeters, had a higher initial force averaging 641 grams (22.5 ounces) than the Ormco Power Chain which averages 342 grams (12.0 ounces). In one day the force was reduced to 171 grams (6.0 ounces) for both materials. The elastic materials within the same batch showed a great variation in the modulus of elasticity under different test conditions. The approximate force generated when stretched dry, within the elastic limit, was 22 grams per millimeter for 3/16 inches heavy latex elastics. The Unitek AlastiK C2 gave a force of 89 grams per millimeter, while the Ormco Power Chain had a value of 46 grams per millimeter. The modulus of elasticity of all of the materials was much lower after immersion in the water bath. The force decay under constant force application to latex, elastic, polymer chains, and tied loops showed that the greatest amount of force decay occurred during the first three hours in the water bath. The forces remained relatively the same throughout the rest of the test period. The elastic materials undergo permanent deformation in shape. The synthetic elastomers exhibited plastic deformation when the elastomers were stretched 17 millimeters for 21 days. In the dry condition the force decay was 63% for the Unitek chains and 42% for the Ormco Power Chain. The synthetic elastomers should be prestretched before being placed in the mouth. The elastomers should be used within their resilient ranges. Clinical treatment procedures should take into consideration the rapid initial force decay of elastic materials that occurs during the first day and the residual forces remaining.
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              The effect of hydrogen ion concentration on the force-degradation rate of orthodontic polyurethane chain elastics.

              The effect of pH on the force-degradation rates of seven commercial orthodontic polyurethane chain elastics was evaluated in an in vitro study. The pH values of 4.95 and 7.26 were selected for testing because they represent values close to the reported extremes of plaque and saliva pH. Seven test elastic products were extended to (1) equal distances and (2) equal initial force levels, and the force-degradation rates were recorded over 4 weeks. All the test products yielded a significantly greater force-decay rate in the basic (pH 7.26) solution than in the acidic (pH 4.95) solution over 4 weeks. A hypothesis is presented that the decay rate of orthodontic polyurethane chain elastics is inversely proportional to the oral pH, with a corollary that basic pH levels are most hostile to polyurethane chain elastics.
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                Author and article information

                Journal
                J Pharm Bioallied Sci
                J Pharm Bioallied Sci
                JPBS
                Journal of Pharmacy & Bioallied Sciences
                Medknow Publications & Media Pvt Ltd (India )
                0976-4879
                0975-7406
                May 2019
                : 11
                : Suppl 2
                : S269-S273
                Affiliations
                [1]Department of Orthodontics and Dentofacial Orthopaedics, Sree Anjaneya Institute of Dental Sciences, Calicut, Kerala, India
                [1 ]Department of Prosthodontics, Sree Anjaneya Institute of Dental Sciences, Calicut, Kerala, India
                Author notes
                Address for correspondence: Dr. Vineetha Venugopal Menon, Department of Orthodontics and Dentofacial Orthopaedics, Sree Anjaneya Institute of Dental Sciences, Calicut 673315, Kerala, India. E-mail: vinee.menon1@ 123456gmail.com
                Article
                JPBS-11-269
                10.4103/JPBS.JPBS_9_19
                6555337
                31198351
                b0b9154b-954d-47c4-a4f7-7efae5ed2c79
                Copyright: © 2019 Journal of Pharmacy and Bioallied Sciences

                This is an open access journal, and articles are distributed under the terms of the Creative Commons Attribution-NonCommercial-ShareAlike 4.0 License, which allows others to remix, tweak, and build upon the work non-commercially, as long as appropriate credit is given and the new creations are licensed under the identical terms.

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                Categories
                Original Article

                Pharmacology & Pharmaceutical medicine
                force decay,elastomeric chain,mouth rinses
                Pharmacology & Pharmaceutical medicine
                force decay, elastomeric chain, mouth rinses

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