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Article
Hypodontia in Down’s syndrome patients

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: 2009 Volume: 21 Issue: 1 Pages: 98-103
Publisher: Baghdad University جامعة بغداد

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Abstract

ABSTRACT
Background: The intention of this study was to quantify the occurrence of hypodontia in a group of individuals with
Down syndrome.
Materials and method: The sample consisted of 164 subjects with Down syndrome with an age ranged 14-18 years,
the subjects were examined clinically, when radiographs were in need, orthopantomograph, occlusal, or periapical
were often taken to confirm the diagnosis.
Results: The results show a notably high prevalence of hypodontia in individuals with Down syndrome (45.2%) being
higher in females (47.4%) than males (42.3%), the hypodontia in the maxilla was higher than in the mandible and on
the right side of females was higher than the left side, while males show on the left side was higher than the right side
though this difference was not significant. The number of congenitally missing teeth also in females was higher than in
males; the most congenitally missing teeth were the lower second premolars, upper lateral incisors, lower second
premolars and lower lateral incisors respectively. The distribution of peg–shaped lateral incisors was 15% and more
unilaterally than bilaterally.
Conclusions: This study reveals a high prevalence of hypodontia (missing teeth and peg-shaped lateral incisors) in
patients with Down syndrome. No explanation other than genetics is immediately available to explain why
hypodontia should represent another phenotypic expression of this trisomy
Keyword:Down's syndrome, Hypodontia, Peg-shaped lateral incisors. (J Bagh Coll Dentistry 2009; 21(1): 98-103)

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Article
Mandibular arch form and late anterior crowding

Authors: Dheaa H. Abd Awn --- Isaac A. Y. Abouna --- Tariq T. Raiq
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2007 Volume: 19 Issue: 1 Pages: 95-100
Publisher: Baghdad University جامعة بغداد

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Abstract

ABSTRACT
Background: Postadolescent crowding in the lower dental arch that develops after completion of permanent dentition and during teenage period is a common orthodontic problem and usually occurs in the incisors region. This cross-sectional study aimed to evaluate the distribution of different mandibular arch forms in late lower anterior crowded dentition.
Materials and Method: The research surveyed 73 patients (33 boys and 40 girls) with various severities of late lower anterior crowding assessed by the classical Irregularity Index of Little1, while the mandibular arch form was determined by applying the approach of Raberin et al.
Results: The data declared the sequential distribution of flat, pointed, mid, narrow, and wide forms (37%, 30%, 18%, 12%, 3%) respectively, with no clear gender dimorphism. It appears that this distribution is not greatly affected by the severity of the crowding.
Conclusion: The common feature of reduced anterior arch length in late lower crowded dentition leads to the superiority of the flat arches followed by the pointed form with reduced intercanine width.
Key words: Mandibular crowding, arch form. (J Bagh Coll Dentistry 2007; 19(1): 95-100).

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Article
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
Mandibular dental arch parameters in Down's Syndrome patients with Class I occlusion. (A comparative study)

Authors: Mustafa M. Al-Khatieeb --- Dheaa H. Abd Awn --- Nidhal H. Ghaib
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2008 Volume: 20 Issue: 1 Pages: 72-77
Publisher: Baghdad University جامعة بغداد

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Abstract

ABSTRACT
Background: The aim of this study was to find out the dental arch form for patients with Down's syndrome and to compare the mandibular dental arch parameters of those patients with the corresponding norms, and to gain a correlation between the maxillary and mandibular arches for the Down's syndrome patients from previous study.
Subjects and methods: A total sample of 50 patients with Down's syndrome was examined with an age ranged from14-18 years. The mandibular dental arch parameters were compared with another group, control, on student of an intermediate school matching with the age and Angle's classification (Class I). Study models for the maxillary and mandibular arches were constructed, and then dental arch measurements were carried out and evaluated.
Results: The mandibular arch parameters for the patients with Down's syndrome showed significantly smaller mean values than the control group for both genders with the males had greater values in inter arch distance and length, with high correlation between the maxillary and mandibular jaws. The wide arch form is the dominated arch form while the flat is the least to appear.
Conclusion: The growth pattern of dental arches in Down's syndrome patients is proportionally reduced when compared with those of norms, with a symmetrical configuration. Hence all arch forms are presented with different distribution.
Keyword: Down's syndrome, Dental arch parameter, Genetic influence. (J Bagh Coll Dentistry 2008; 20(1) 72-77)

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Article
Mandibular dental arch parameters in Down's syndrome patients with Class I occlusion. (A comparative study)

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Abstract

This study is carried out to find the dental arch form for patients with Down's syndrome and to compare the lower dental arch parameters of those patients with the corresponding norms, and to gain a correlation between the upper and lower arches for the Down's syndrome patients from previous study. A total sample of 50 patients with Down's syndrome were examined with an age ranged 14-18 years, the lower dental arch parameters were compared with another group, control, on student of an intermediate school matching with the age and Angle's classification (Class I).Study models for the upper and lower arches were constructed, then dental arch measurements were carried out and evaluated. The results show that the lower arch parameters for the patients with Down's syndrome were significantly smaller mean values than the control group for both genders with the males had greater values in inter arch distance and length, with high correlation between the upper and lower jaws .The wide arch form is the dominated arch form while the flat is the least to appear. The conclusion of the study is that the growth pattern of dental arches in Down's syndrome patients proportionally reduced when compared with those of norms, with a symmetrical configuration. Hence all arch forms are presented with different distribution.


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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