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The relation of load deflection of nickel titanium orthodontic wires and the application of different fluoride containing tooth paste (an in vitro study)

Authors: Dheaa H. Abd Awn --- Mustafa M. Al-Khatieeb --- Nidhal H. Ghaib
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2007 Volume: 19 Issue: 1 Pages: 115-121
Publisher: Baghdad University جامعة بغداد

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Abstract

ABSTRACT
Background: This study was designed to find the relation of load deflection of round 0.012 inch nickel titanium orthodontic wires, the application of different fluoride containing tooth paste, and the effect of immersion time in these fluoride containing tooth pastes on the load deflections of nickel titanium orthodontic wires.
Materials and method: The straight portion of preformed (arch form) round 0.012 inch nickel titanium orthodontic arch wire was cut and immersed either in one of the tested fluoride containing tooth pastes or in the controlled medium “artificial saliva”, where incubated at 37oC in special incubator at 2 time intervals (60 and 90 minutes).The load deflections of the wires were measured with a specially designed test apparatus based on the mechanism of 3-point bending test.
Results: The nickel titanium arch wire after immersion in acidulated monoflurophosphate tooth paste reveals lowest load deflection among the immersion test media (tooth paste), while the immersion in neutral sodium fluoride containing tooth paste reveals intermediate load deflection, and the immersion in stannous fluoride containing tooth paste reveals highest load deflection which is closest to that in artificial saliva. F- test by ANOVA table shows that there is a highly significant difference (P< 0.0001) between all chemical reagents at the mean 2 time intervals for the mean load deflections of nickel titanium arch wires, and there is a significant difference at 60 minutes between all chemical reagents at P< 0.05, and there is a highly significant difference at 90 minutes between all chemical reagents for the mean load deflections of Ni-Ti arch wires at P< 0.0001. Using fluoride containing tooth paste with nickel titanium arch wire could decrease the load deflection; in addition to the fact that there is an inverse relation between the immersion time and the load deflection of nickel titanium arch wire. This may contribute to prolong orthodontic treatment.
Conclusions: The stannous fluoride containing tooth paste seems to be the best fluoride containing tooth paste because it shows no detrimental effect on the load deflection of nickel titanium arch wire. So during the long period orthodontic treatment, both patient and clinical doctor should carefully use the fluoride containing products (teeth pastes, topical prophylactic agents, etc…).
Keyword: Load deflection, nickel titanium wire, Fluoride, Toothpaste. (J Bagh Coll Dentistry 2007; 19(1): 115-121).

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Article
The mesiodistal Crown Width Measurements and Bolton Analysis in Down's Syndrome with Class I Normal Occlusion. (A Comparative study)

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Abstract

Information concerning tooth size in human population is important for clinician, since it may explore the role of genes and their possible effect on the dental characters, as the tooth size and morphology served as genetic markers.Aims of study: to compare the mesiodistal crown width of patient with Down's syndrome to that of control norms and explore the possible irregularities between the left and right side for both jaws in different sexes and to totaled and computed the Bolton ratios for the different groups.Material and methods: This study was conducted on 58 patients with Down's syndrome aged (13-21) years; the mesiodistal crown dimension was estimated for the upper and lower permanent teeth and compared with those of control group matching the age and the Angle classification (Class 1)Results showed a non significant sexual dimorphism in both arches and showed a similar size order distribution to the control group .but the mean width value of the Down's patient significantly smaller than that of norms with some exceptions, these factors make the Bolton value to increase to a great extent than the original one

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