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Frictional resistance in monocrystalline ceramic brackets with conventional and nonconventional elastomeric ligatures.

Galvão MB, Camporesi M, Tortamano A, Dominguez GC, Defraia E - Prog Orthod (2013)

Bottom Line: SENT showed significantly greater frictional force than Inspire Ice brackets and Pure brackets with NCEL.A significantly greater amount of frictional force was generated with CEL when compared with NCEL for all the tested variables, with the exception of the Pure brackets with 0.012-in.Nonconventional elastomeric ligatures are able to reduce friction in monocrystalline ceramic brackets.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontic, University of Florence, Via Ponte di Mezzo 46/48, Florence, 50100, Italy. matteo_camporesi@yahoo.it.

ABSTRACT

Background: The objective of this study was to compare the frictional forces generated by three types of monocrystalline ceramic brackets coupled with conventional elastomeric ligatures (CEL) and nonconventional elastomeric ligatures (NCEL) during the alignment of apically displaced teeth at the maxillary arch.

Methods: All tests (a total of 480 tests) were carried out in a dry state on a universal testing machine with a testing model consisting of three 0.022-in. monocrystalline ceramic preadjusted brackets (from the maxillary right second premolar through the right central incisor). The canine bracket was bonded to a sliding bar that allowed for different vertical positions. The frictional forces generated by a 0.012- and 0.014-in. superelastic nickel titanium wire (SENT) with conventional and nonconventional ligatures at various amounts of canine misalignment (1.5, 3.0, 4.5, and 6.0 mm) were recorded. Comparisons between the different types of bracket-wire-ligature systems were carried out by means of analysis of variance on ranks with Tukey's post hoc test (P<0.05).

Results: No significant differences were assessed among the three types of monocrystalline brackets with NCEL when coupled with 0.012-in. SENT. Radiance brackets with NCEL coupled with 0.014-in. SENT showed significantly greater frictional force than Inspire Ice brackets and Pure brackets with NCEL. A significantly greater amount of frictional force was generated with CEL when compared with NCEL for all the tested variables, with the exception of the Pure brackets with 0.012-in. SENT at 1.5 and 3.0 mm of canine misalignment where similar frictional forces were found.

Conclusions: Nonconventional elastomeric ligatures are able to reduce friction in monocrystalline ceramic brackets.

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Related in: MedlinePlus

Experimentalin vitromodel with misaligned canine bracket.
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Fig1: Experimentalin vitromodel with misaligned canine bracket.

Mentions: An experimental model [11] (Figure 1) was used to assess the frictional forces produced by three types of 0.022-in. slot monocrystalline ceramic preadjusted brackets with Roth prescription combined with different types of elastomeric ligatures:


Frictional resistance in monocrystalline ceramic brackets with conventional and nonconventional elastomeric ligatures.

Galvão MB, Camporesi M, Tortamano A, Dominguez GC, Defraia E - Prog Orthod (2013)

Experimentalin vitromodel with misaligned canine bracket.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4384920&req=5

Fig1: Experimentalin vitromodel with misaligned canine bracket.
Mentions: An experimental model [11] (Figure 1) was used to assess the frictional forces produced by three types of 0.022-in. slot monocrystalline ceramic preadjusted brackets with Roth prescription combined with different types of elastomeric ligatures:

Bottom Line: SENT showed significantly greater frictional force than Inspire Ice brackets and Pure brackets with NCEL.A significantly greater amount of frictional force was generated with CEL when compared with NCEL for all the tested variables, with the exception of the Pure brackets with 0.012-in.Nonconventional elastomeric ligatures are able to reduce friction in monocrystalline ceramic brackets.

View Article: PubMed Central - PubMed

Affiliation: Department of Orthodontic, University of Florence, Via Ponte di Mezzo 46/48, Florence, 50100, Italy. matteo_camporesi@yahoo.it.

ABSTRACT

Background: The objective of this study was to compare the frictional forces generated by three types of monocrystalline ceramic brackets coupled with conventional elastomeric ligatures (CEL) and nonconventional elastomeric ligatures (NCEL) during the alignment of apically displaced teeth at the maxillary arch.

Methods: All tests (a total of 480 tests) were carried out in a dry state on a universal testing machine with a testing model consisting of three 0.022-in. monocrystalline ceramic preadjusted brackets (from the maxillary right second premolar through the right central incisor). The canine bracket was bonded to a sliding bar that allowed for different vertical positions. The frictional forces generated by a 0.012- and 0.014-in. superelastic nickel titanium wire (SENT) with conventional and nonconventional ligatures at various amounts of canine misalignment (1.5, 3.0, 4.5, and 6.0 mm) were recorded. Comparisons between the different types of bracket-wire-ligature systems were carried out by means of analysis of variance on ranks with Tukey's post hoc test (P<0.05).

Results: No significant differences were assessed among the three types of monocrystalline brackets with NCEL when coupled with 0.012-in. SENT. Radiance brackets with NCEL coupled with 0.014-in. SENT showed significantly greater frictional force than Inspire Ice brackets and Pure brackets with NCEL. A significantly greater amount of frictional force was generated with CEL when compared with NCEL for all the tested variables, with the exception of the Pure brackets with 0.012-in. SENT at 1.5 and 3.0 mm of canine misalignment where similar frictional forces were found.

Conclusions: Nonconventional elastomeric ligatures are able to reduce friction in monocrystalline ceramic brackets.

Show MeSH
Related in: MedlinePlus