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Evaluation of the effect of different stretching patterns on force decay and tensile properties of elastomeric ligatures.

Aminian A, Nakhaei S, Agahi RH, Rezaeizade M, Aliabadi HM, Heidarpour M - Dent Res J (Isfahan) (2015 Nov-Dec)

Bottom Line: The maximum force decay occurred during the first 24 h (49.9% ± 15%) and the amount of force decay was 75.7% ± 8% after 8 weeks.In general, the TS decreased during the study period, and the amount of extension to TS increased.Although the elastic behavior of all ligatures under study was similar, the amount of residual force, TS and extension to TS increased in elastomers under point stretching pattern.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Kerman Dental School, Kerman Oral and Dental Diseases Research Center, Kerman University of Medical Science, Kerman, Iran.

ABSTRACT

Background: There have been numerous researches on elastomeric ligatures, but clinical conditions in different stages of treatment are not exactly similar to laboratory conditions. The aim of this in vitro study was to simulate clinical conditions and evaluate the effect of three stretching patterns on the amount of force, tensile strength (TS) and extension to TS of the elastomers during 8 weeks.

Materials and methods: Forces, TS and extension to TS of two different brands of elastomers were measured at initial, 24 h and 2, 4, and 8-week intervals using a testing machine. During the study period, the elastomers were stored in three different types of jig (uniform stretching, 1 and 3 mm point stretching) designed by the computer-aided design and computer-aided manufacturing technique in order to simulate the different stages of orthodontic treatment.

Results: The elastomeric ligatures under study exhibited a similar force decay pattern. The maximum force decay occurred during the first 24 h (49.9% ± 15%) and the amount of force decay was 75.7% ± 8% after 8 weeks. In general, the TS decreased during the study period, and the amount of extension to TS increased.

Conclusion: Although the elastic behavior of all ligatures under study was similar, the amount of residual force, TS and extension to TS increased in elastomers under point stretching pattern.

No MeSH data available.


Related in: MedlinePlus

(a) Point stretch storage jig. (b) Uniform stretch storage jig.
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Figure 2: (a) Point stretch storage jig. (b) Uniform stretch storage jig.

Mentions: The uniform stretch jig was prepared from a rectangular aluminum bur measuring 1.6 mm × 3.7 mm, similar to the dimensions of the slot base of a maxillary central incisor Gemini Metal bracket 0.022 inch slot (3M Unitek, South Peck Road, Monrovia, USA). The corners of the jig were rounded similar to the corners of the bracket slot base to prevent damage to and rupture of the elastomers. One end of the jig was designed tapered to facilitate placing and removing the samples [Figure 2].


Evaluation of the effect of different stretching patterns on force decay and tensile properties of elastomeric ligatures.

Aminian A, Nakhaei S, Agahi RH, Rezaeizade M, Aliabadi HM, Heidarpour M - Dent Res J (Isfahan) (2015 Nov-Dec)

(a) Point stretch storage jig. (b) Uniform stretch storage jig.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4696363&req=5

Figure 2: (a) Point stretch storage jig. (b) Uniform stretch storage jig.
Mentions: The uniform stretch jig was prepared from a rectangular aluminum bur measuring 1.6 mm × 3.7 mm, similar to the dimensions of the slot base of a maxillary central incisor Gemini Metal bracket 0.022 inch slot (3M Unitek, South Peck Road, Monrovia, USA). The corners of the jig were rounded similar to the corners of the bracket slot base to prevent damage to and rupture of the elastomers. One end of the jig was designed tapered to facilitate placing and removing the samples [Figure 2].

Bottom Line: The maximum force decay occurred during the first 24 h (49.9% ± 15%) and the amount of force decay was 75.7% ± 8% after 8 weeks.In general, the TS decreased during the study period, and the amount of extension to TS increased.Although the elastic behavior of all ligatures under study was similar, the amount of residual force, TS and extension to TS increased in elastomers under point stretching pattern.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontics, Kerman Dental School, Kerman Oral and Dental Diseases Research Center, Kerman University of Medical Science, Kerman, Iran.

ABSTRACT

Background: There have been numerous researches on elastomeric ligatures, but clinical conditions in different stages of treatment are not exactly similar to laboratory conditions. The aim of this in vitro study was to simulate clinical conditions and evaluate the effect of three stretching patterns on the amount of force, tensile strength (TS) and extension to TS of the elastomers during 8 weeks.

Materials and methods: Forces, TS and extension to TS of two different brands of elastomers were measured at initial, 24 h and 2, 4, and 8-week intervals using a testing machine. During the study period, the elastomers were stored in three different types of jig (uniform stretching, 1 and 3 mm point stretching) designed by the computer-aided design and computer-aided manufacturing technique in order to simulate the different stages of orthodontic treatment.

Results: The elastomeric ligatures under study exhibited a similar force decay pattern. The maximum force decay occurred during the first 24 h (49.9% ± 15%) and the amount of force decay was 75.7% ± 8% after 8 weeks. In general, the TS decreased during the study period, and the amount of extension to TS increased.

Conclusion: Although the elastic behavior of all ligatures under study was similar, the amount of residual force, TS and extension to TS increased in elastomers under point stretching pattern.

No MeSH data available.


Related in: MedlinePlus