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Article
Evaluation of the effect of curing techniques on colour property of acrylic resins

Authors: Nadira A Hatim --- Amer A Taqa --- Radhwan H Hasan
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 1 Pages: 28-33
Publisher: Mosul University جامعة الموصل

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Abstract

This study was carried out to evaluate the colour property of two types of acrylic resin materials cured by microwave technique in comparison with that cured by conventional water bath technique. Two types of heat cured acrylic resin materials were selected: Quayle–Dental and Major–base types. Seventy–two samples (30×20×1.5 mm) were prepared and divided into four experimental groups: Quayle–Dental and Major–base groups were cured by microwave technique and the others Quayle–Dental and Major–base groups were cured by water–bath technique. The number of samples for each group was 18. The colour property for the samples was evaluated using computerized ultraviolet–visible spectrophotometer with accuracy up to 0.001 nm. The absorbed light was measured which is also termed the optical density. The results of this study showed that there were no significant differences in optical density for acrylic resin samples cured by microwave and water–bath techniques, and the acrylic resin with smaller particle size (Quayle–Dental) showed higher optical density (colour property) than that of larger particle size (Major–base).


Article
Apical root resorption of maxillary anterior teeth after orthodontic treatment of Class II division 1 occlusion with Roth appliance

Author: Saad S Gasgoos
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2004 Volume: 4 Issue: 2 Pages: 166-172
Publisher: Mosul University جامعة الموصل

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Abstract

The aims of this study were to evaluate the effect of orthodontic treatment on root length (ratios of root length after / before treatment) of the upper anterior teeth after correction of Class II division 1 incisal relation, to evaluate the time of treatment and its effect on root resorption and to show if there is any risk of root resorption in relation to sex. The sample was composed of 25 patients (15 females and 10 males) 15–25 years old age. All patients were treated with 22×30 slot brackets fixed stainless steel Roth system appliances after extraction of bilateral maxillary first premolars. The canines were retracted individually along the base arch wire with power chain elastics that were changed every 1 week, then the four upper incisors were retracted with vertical loops. The results of periapical radiograph measurements before and after treatment indicated that there were a noticeable apical root resorption with blunted irregular apex after the completion of orthodontic treatment. The incisor roots were affected more than the canines. In addition, there were no gender differences in root resorption between males and females (except upper left lateral incisor). The mean treatment time from beginning to end of treatment and obtaining Class I incisal relation was 21.4 months.

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