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Article
Influence of different recycling protocols on load deflection of nickel titanium orthodontic wire

Author: Dr. Mustafa M. Al-Khatieeb. B.D.S., M.Sc. * د. مصطفى الخطيب
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2008 Volume: 5 Issue: 1 Pages: 71-79
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

The purpose of this study was to investigate the changes in the load deflection of nickel titanium orthodontic wire after different recycling protocols. A spooled 0.014 inch nickel titanium wire was separated into 7 groups: as received condition (T0,control group),treated in artificial saliva for 4 weeks (T1), treated in artificial saliva and autoclaved (T2), treated in artificial saliva and dry heated (T3), treated in artificial saliva and disinfected by glutaraldehyde (T4), treated in artificial saliva and disinfected by iodophor (T5) and treated in artificial saliva and disinfected by chlorhexidine (T6).The changes in the load deflection were observed by special test apparatus based on 3-point bending mechanism, the findings of the current study showed that there was highly significant difference in mean load deflection of nickel titanium wire between all recycling protocols (P< 0.0001). The recycling by sterilization of the wire by heat autoclave or disinfection by chlorhexidine both seem to be the best recycling protocols because of lowest detrimental effect on the load deflection, while the disinfection by glutaraldehyde or iodophor shows intermediate detrimental effect on the load deflection, and the sterilization by dry heat seems to be the worst recycling protocol because it shows highest detrimental effect on the load deflection value.


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.

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