Comparison of Mechanical Properties Between three Different Types of T-loop
Statement of Problem: T-loop is one of the most popular closing loops in orthodontic profession. However its activation is in the contrary to Bouschinger effect theory, since the formed bends would be opened during activation. The purpose of this study was to add a helix in a way to be more resp...
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Shiraz University of Medical Sciences
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doaj-2d9b87e8531841089377aa78634ee5d92020-11-24T23:23:46ZengShiraz University of Medical SciencesJournal of Dental Biomaterial2383-39712383-398X2015-06-0122Comparison of Mechanical Properties Between three Different Types of T-loopAjami Sh0Oshagh M1Torabinejad F2Behroozi Z3Orthodontics Research Center , Department of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IranOrthodontist, Private PracticeDepartment of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz,IranDepartment of Orthodontics, School of Dentistry, Shiraz University of Medical Sciences, Shiraz,IranStatement of Problem: T-loop is one of the most popular closing loops in orthodontic profession. However its activation is in the contrary to Bouschinger effect theory, since the formed bends would be opened during activation. The purpose of this study was to add a helix in a way to be more respondent to the Bouschinger effect theory. Objectives: To compare the load deflection, maximal elastic load and range between three different types of T-loop. Materials and Methods: 5 sample of each 3 different designs of T-loop (group 1: original T-loop, group 2: T-loop with the two inner helices, group 3: T-loop with the two helices constructed outside the horizontal part) had been tested with universal testing machine (Instron). The load –deflection curves was plotted and the mechanical properties (load deflection, maximal elastic load and range) were measured. One way ANOVA was used to identify statistical differences between designs. Results: The mean value of maximal elastic load in group 1 (6.02±0.27) was significantly higher than group 2 (5.16±0.46) and in group 2 were significantly higher than group3 (4.35±0.25) (p<0.001). A significantly higher load deflection was reported in group 1 (0.73±0.36) in comparison to group2 (0.56±0.74) and group 3(0.56±0.69) (p=0.002), with no significant difference between two latest groups (p=0.999). The mean range in group 3 (4.15±0.10) was significantly lower than group 1(5.43±0.13) and group 2 (5.59±0.15) (p=<0.001) with no significant difference between group 1 and 2 (p=0.149). Conclusions: The results revealed that increasing length of T-loop with helices will decrease Load deflection rate the place and design of helices might not be a crucial factor. The new design of T-loop with helices relevant to Bouschinger effect theory needs a further survey regarding their position.http://jdb.sums.ac.ir/index.php/jdb/article/viewFile/102/48T-loopLoad deflectionMaximal deflectionRange |
collection |
DOAJ |
language |
English |
format |
Article |
sources |
DOAJ |
author |
Ajami Sh Oshagh M Torabinejad F Behroozi Z |
spellingShingle |
Ajami Sh Oshagh M Torabinejad F Behroozi Z Comparison of Mechanical Properties Between three Different Types of T-loop Journal of Dental Biomaterial T-loop Load deflection Maximal deflection Range |
author_facet |
Ajami Sh Oshagh M Torabinejad F Behroozi Z |
author_sort |
Ajami Sh |
title |
Comparison of Mechanical Properties Between three Different Types of T-loop |
title_short |
Comparison of Mechanical Properties Between three Different Types of T-loop |
title_full |
Comparison of Mechanical Properties Between three Different Types of T-loop |
title_fullStr |
Comparison of Mechanical Properties Between three Different Types of T-loop |
title_full_unstemmed |
Comparison of Mechanical Properties Between three Different Types of T-loop |
title_sort |
comparison of mechanical properties between three different types of t-loop |
publisher |
Shiraz University of Medical Sciences |
series |
Journal of Dental Biomaterial |
issn |
2383-3971 2383-398X |
publishDate |
2015-06-01 |
description |
Statement of Problem: T-loop is one of the most popular closing loops in
orthodontic profession. However its activation is in the contrary to
Bouschinger effect theory, since the formed bends would be opened during
activation. The purpose of this study was to add a helix in a way to be more
respondent to the Bouschinger effect theory.
Objectives: To compare the load deflection, maximal elastic load and range
between three different types of T-loop.
Materials and Methods: 5 sample of each 3 different designs of T-loop
(group 1: original T-loop, group 2: T-loop with the two inner helices, group
3: T-loop with the two helices constructed outside the horizontal part) had
been tested with universal testing machine (Instron). The load –deflection
curves was plotted and the mechanical properties (load deflection, maximal
elastic load and range) were measured. One way ANOVA was used to identify
statistical differences between designs.
Results: The mean value of maximal elastic load in group 1 (6.02±0.27) was
significantly higher than group 2 (5.16±0.46) and in group 2 were significantly
higher than group3 (4.35±0.25) (p<0.001). A significantly higher load deflection
was reported in group 1 (0.73±0.36) in comparison to group2
(0.56±0.74) and group 3(0.56±0.69) (p=0.002), with no significant difference
between two latest groups (p=0.999). The mean range in group 3 (4.15±0.10)
was significantly lower than group 1(5.43±0.13) and group 2 (5.59±0.15)
(p=<0.001) with no significant difference between group 1 and 2 (p=0.149).
Conclusions: The results revealed that increasing length of T-loop with helices
will decrease Load deflection rate the place and design of helices might
not be a crucial factor. The new design of T-loop with helices relevant to
Bouschinger effect theory needs a further survey regarding their position. |
topic |
T-loop Load deflection Maximal deflection Range |
url |
http://jdb.sums.ac.ir/index.php/jdb/article/viewFile/102/48 |
work_keys_str_mv |
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