Print ISSN: 1812-1217

Online ISSN: 1998-0345

Keywords : Digital


Evaluation of a Newly Designed Computerized Data Base for Clinical Orthodontic Decision.

Nada M Al-Sayagh; Afrah K Al-Hamdany

Al-Rafidain Dental Journal, Volume 11, Issue 1, Pages 161-171

Aims: To prepare a newly designed diagnostic digital chart for orthodontic patients, and to help or-thodontist making decision in term of diagnosis and treatment planning by using Access program to determine the ideal orthodontic treatment of a patient to provide optimum orthodontic appliances for such treatment. Materials and Methods: A newly designed diagnostic digital chart for orthodontic patients was designed using Access program containing sixteen program forms of examination, diag-nosis and treatment plan. In order to evaluate this newly designed digital chart, Multiple Linear Re-gression Analysis was used. This analysis aims to reveal the importance, strength and direction of factors (26 independent variables= constant variables) and their effects on the 12 dependent variables (random variables) [parameter estimation],all of which representing the information and data taken from fifty randomly selected orthodontic patients' files available in the Department of Orthodontics-College of Dentistry-University of Mosul, who were treated with removable appliances by dental stu-dents of fifth class during year 2007-2008. The effects of the independent variables vary in negative or positive way, or even may have zero effect depend on the studied dependent variable. Results :R square measures the proportion of the variability in the dependent variable about the origin explained by regression. The least variability is in y1(right 1st molar occlusion),where as the highest one in y4(left canine occlusion),{R-Sq for y 1 =0.0%, y2=57.8%, y3= 41.1%, y4=65.6%, y5=32.0%, y6 = 50.9%, y7= 60.5% , y8=62.8%, y9=51.6%, y19=61 .3%, y11=28.2% and y12=51.5%}, each value representing the importance, strength and direction of independent factors and their effects on the dependent factors. Conclusions: New digital orthodontic examination and diagnosis chart was pre-pared. The creation of a digital chart that combines the use of information technology with a consis-tent analysis to aid orthodontic diagnosis will be a relevant contribution to the improvement of ortho-dontic care in POP Department in College of Dentistry/Mosul University.

Digital analysis of the color of the heat-cured acrylic resin (using scanner)

Lamia T Rejab

Al-Rafidain Dental Journal, Volume 11, Issue 1, Pages 88-95

Aim: Using scanner image to digitally analyze the brightness and the effect of the type the of material, thickness and immersion of material in different solutions on the color change of the heat-cured acrylic resin denture base material. Materials and Methods: Two types of heat-cured acrylic resin denture base material were used. Totally 30 samples were prepared for uniform dimension for each color test. Sample scanner imaged and color metric is analyzed with software program Adob Photoshop 9.0. The CommissionInte´rnationale de l’E´ clairage for characterizing color ( CIE L*a*b*) color difference metrics were used for the performance analysis. Color change (ΔE) value calculated to determine clini-cally acceptable color change. Statistically ANOVA, Student's t–test , Dunnett pairwise multiple com-parison t–test and Duncan's multiple range test were carried out to determine the significant differences at p≤ 0.05 . Results: The results appeared that there is a significant differences of the brightness value before and after polishing of the acrylic resin samples. And statistically there is a significant effect of type, thickness, and immersion in different solution on the color change of the tested materials which is clinically not acceptable . Conclusion : The result appeared that scanner gives an accurate image to digitally evaluate brightness and color change of dental materials with CIE L*a*b*color system.

An evaluation of the Film–Based and Digital Panoramic Radiographic Quality

Rand Shaker Al-Ani

Al-Rafidain Dental Journal, Volume 8, Issue 1, Pages 67-71
DOI: 10.33899/rden.2008.9044

Aims: To compare the image quality of panoramic radiographs obtained with charge–coupled device(CCD) and screen–film systems. Materials and methods: True Panoramic radiographs were taken in26 patients each with both screen–film and CCD systems. The images were obtained with TRATO2000, CE by VILLA SISTEMI MEDICALIS–ITALY with regular intensifying screen typeKodak Lanex and 6 x 12 inch screen type film used for film–based projection, while Dimax3digital system pan/ceph, PLANMECA, Helsinki, Finland with CCD X–ray image sensor (thesize of the panoramic sensor was 15 x 30 cm and the resolution of the panoramic image was around230 dpi, used for digital projection. Both X–ray machines were operated at range of 70–80kV and 10–12 mA, according to the patient age. Altogether, the digital images files weredisplayed on 17 inch monitor, brightness and contrast were fixed and no enhancement wasmade before the digital images files were saved. While the film–based images after processingwere viewed on the viewer box. Image quality was assessed by rating the visibilityof five anatomical landmarks commonly found on panoramic radiographs: The superior andinferior cortex of the mandibular canal, the superior and inferior margin of the mentalforamen, the lower and anterior border of the maxillary sinus, the lower border of themandible, and the articular eminence. For each image, the given landmark was rated as good(image of excellent diagnostic quality), acceptable (image of diagnostic quality but shouldbe improved), or unacceptable (image not of diagnostic quality). Each image was then givenan overall evaluation rating of good, acceptable, or unacceptable. Results: The data collectedfrom the evaluation of the digital and film–based images by the three examiners, were analyzedby t–test. The image quality, as represented by each of the five anatomical landmarks,and the overall rating for each system were expressed as the mean scores of the threeexaminers. The difference between the film–based and the digital images systems was not statisticallysignificant (P>0.05). Conclusions: It was concluded that digital panoramic radiographs are equivalentto film–based images for the five anatomical landmarks.