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Article
Radiological accuracy in the interpretation of apical fitness in endodontics

Authors: Nazar Gh Jameel --- Nawfal A Zakaria
Journal: Al-Rafidain Dental Journal مجلة الرافدين لطب الأسنان ISSN: 18121217 Year: 2006 Volume: 6 Issue: 2 Pages: 151-154
Publisher: Mosul University جامعة الموصل

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Abstract

Aim: To compare the accuracy of right–angle paralleling and bisecting–angle radiographictechniques in the determination of apical fitness in endodontic therapy. Materials and Methods:Thirty three root canals of first upper and lower molar teeth have been used in this study. A K–filewas inserted into the canal until its tip was fit snuggly one millimeter shorter than the apex. Eachtooth then radiographed twice by the right–angle paralleling and bisecting–angle techniques. Thedistance between the file tip and the center of radiographical apex was directly measured by twoexaminers and the mean of each two measurements was recorded. Data were collected and analyzedstatistically by analysis of variance and Duncan’s Multiple Range test. Results: The mean valuerevealed that there were clear differences between the mean of measurements by the paralleltechnique (0.87mm) and that with the bisecting technique (0.39mm), when these two resultscompared with the mean of real measurements (1mm). One way analysis of variance revealed therewere significant differences in one of the three groups at p < 0.05 level. Duncan’ Multiple Range testshowed that the parallel measurements when compared with the real measurements the results showed that there was no significant difference but was significantly different from the bisecting measurements. Conclusion: It is preferable to the dentist to use the right–angle paralleling technique during root canal treatment, where it gives more accurate result for estimation of the working length.

Keywords

Parallel --- bisecting --- apical fitness


Article
New approach in Bisecting angle technique

Author: Dr. Mona Abdul Hadi Al-Safi B.D.S. , M.Sc.* د. منى عبد الهادي
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2006 Volume: 3 Issue: 1 Pages: 92-96
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Since the conventional radiograph was introduced in 1901, it seems that it has wide spectrum in it use in medical, dentistry & engineering branches.The importance came from its value in diagnosis and predicate the causes of different effects. This lead to more researches for more advanced programs , which continued through last century lead to an advanced radiography like digital one, C.T. scan and M.R.I. Still the conventional radiographs are the baseline for this progress a far farther for future progression.Aim of the study is to prove a new approach in "Bisecting angle technique".The present study indicate the new approach in using the bisecting angle technique since the old one give instructions on three main lines:-A. Patients positioning in the dental chair.B. Positioning of dental intraoral film inside patient mouth.C. The position of the cone of X-ray machine in both vertical and horizontal angles.But Al-Safi method gives instructions number D- about the anatomical landmarks that lead to the apex of the tooth to which central beam is directed, by drawing a line from ala of the nose to the tragus of the ear called ala tragus line indicate the apecies of maxillary teeth , for the mandibular arch a line draw indicate apices of mandibular teeth from the angle of the chin to the angle of the mandible in proper manner.In present study, two groups of fifth years students in the college of Dentistry in Baghdad had been taken. The first group had given instructions A-B-C-, second group had given instructions A-B-C- and D- according to Al-Safi method.The statically analysis using t-test shows , a significant difference between the first and second group in the effectiveness of sharpness and allignments artifacts , from the same point of view there were no significant difference between members of second group while there is a significant difference between members of the first group.The results indicate that the new approach in instructing the second group of students were gave wide predictors for their work and better results in decreasing the technical errors and dental artifacts.

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