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Article
Reliability of Soft Tissue Analysis in Conventional and Digital Cephalographs

Author: Ruba J Mohammed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2013 Volume: 13 Issue: 25 Pages: 108-115
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: This study compared the reliability of measurements of soft tissue cephalometric analysis be-tween the direct digital and conventional cephalometric images using computerized cephalometric pro-gram and hand tracing. Materials and Methods: The adult sample consisted of (30) Iraqi subjects (females and males) with age ranged 18 – 25 years old, the samples satisfied the criteria of this study. Nine soft tissue measurements were recorded from lateral cephalometric radiographs using either hand tracing or digitally directly on the monitor. The data were analyzed using descriptive statistic and stu-dent’s t–test. Results: No significant differences were found between the conventional or hand tracing and digital cephalometric analysis. Conclusions: The analysis of soft tissue profile using digital cepha-lometric analysis is reliable as using the conventional method. Yet, the digital method had more benefit than the conventional method, such as reduction of the radiation dose and the image enhancement.


Article
Evaluation of Nickel Ion Release from Orthodontic Wires in Different Types of Artificial Saliva

Authors: Amer. A. Taqa --- Wafaa Gh. Fathi --- Ruba J. Mohammed
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2014 Volume: 14 Issue: 29 Pages: 182-188
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: To evaluate the amount of nickel ion release from stainless steel orthodontic wires in different artificial saliva and in different time periods. Materials and Methods: This study included six different commercial stainless steel orthodontic wires with different diameters. They were immersed in deionized water (control) and three different artificial saliva, the immersion periods included 7, 14, and 30 days. A graphite-furnace atomic absorption spectrometer (AAS) was used to determine the amount of nickel ions release. Results: The statistical analysis showed that there is a highly significance in the release of nickel ions for all types of wire except wires 0.18, and 0.16 x 0.22 which gave non-significant 2.45 and 1.37 respectively, and the time period of immersion had no significant effect in all types of wire. Conclusions: The release of nickel ions was influenced by the types of wire and the surface areas that in contact with immersion in solution, in addition to the composition of the orthodontic wires, but this were not proportional to the content of metal in the wire.


Article
Calibration Factor for Conventional Linear Cephalometric Measurements

Authors: Ruba J. Mohammed --- Nazar Gh. Jameel --- Mohammad N Al-Mallah
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2018 Volume: 18 Issue: 34 Pages: 31-41
Publisher: Mosul University جامعة الموصل

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Abstract

Aims: the aim of this study is to determine a calibration factor to eliminate the distortion in the linear cephalometric measurements. Materials and Methods; the study was performed on the 5 dry skulls, the first skull contained 12 radiopaque markers fixed at different plains, and radiographed by digital cephalometric x-ray machine. The X and Y axes of the shadow of each radiopaque marker used to estimate the calibration factor. Eight linear distances measured directly and radiographically on the conventional cephalographs of the 5 skulls to evaluate the detected calibration factor. Results; the results showed no-significant difference (p > 0.05) between the direct and calibrated radiographic measurement on the digital and conventional cephalographs. whereas significant difference was found between the conventional cephalometric linear measurements as compared with direct anatomical linear and the conventional cephalometric linear measurements with those measurements manipulated with the estimated calibration factor (p < 0.05). Conclusions; this study found that the conventional cephalometric linear measurements could be reliable as that of digital cephalometric linear measurements, if it's calibrated by the calibration factor (1.08) which is estimated by the present study.

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