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MUSTANSIRIA DENTAL JOURNAL

مجلة المستنصرية لطب الاسنان

ISSN: 18138500
Publisher: Al-Mustansyriah University
Faculty: Dentistry
Language: English

This journal is Open Access

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SCIENTIFIC AND REFERRED DENTAL JOURNAL

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Table of content: 2006 volume:3 issue:1

Article
A comparison of preparing curved canals using NiTi Engine-driven and K-flexo endodontic instruments

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Abstract

The purpose of this in vitro study was to evaluate the combined effect of ProTaper file rotary instruments to K-flexo file hand instruments in curved canals in terms of instrumentation time, change in working length, and spreader penetration depth. Thirty curved mesial canals of extracted mandibular molars were used in this study, divided into two groups (15) canals for each group. In group I the canals were prepared with NiTi ProTaper file with slow speed contra angle hand piece (300rpm). In group II the canals were prepared by step-back technique with Gates-Glidden using stainless steel K-flexo hand instruments. Students't-test revealed that there was a highly significant difference between group I and group II in preparation time, and change in working length. In group II spreader penetrated significantly closer to working length than in group I.


Article
The Incidence of Three Roots and Four Root Canals in Endodontically Treated Mandibular First Molars in Iraqi Population

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Abstract

It is of utmost importance that the clinician be familiar with the variations in root canal anatomy and the characteristics features in various racial groups, since such knowledge can aid location and negotiation of canals as well as their subsequent management. The aim of the present study is to investigate the incidence of three roots and four root canals in the mandibular first molar in Iraqi population. A total of 327 endodontically treated mandibular first molars were investigated in this study. Radiographs of working length determination and canal obturation at different angles of each tooth were mounted, projected and evaluated. The clinical records were reviewed and the findings for the number of roots and root canals were then recorded and tabulated. Roots with multiple canal systems were categorized according to whether the canals exited the root by a common apical foramen or by separated apical foramina. The results showed that 81.96% of the examined teeth had three root canals and the remaining 18.04% had four root canals. Most of the teeth ( 99.08% ) had two roots. Only three teeth ( 0.92% ) had three roots. There was no significant differences between males and females in the incidence of three roots and four root canals ( P > 0.05 ).


Article
Apical and Coronal Microleakage using Mineral Trioxide Aggregate (Comparative Study)

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Abstract

The purpose of this study was to evaluate the potential of using mineral trioxide aggregate (MTA) as a root canal filling material by comparing its apical sealing ability with that of laterally condensed gutta-percha with sealer in extracted one canal teeth. In addition, this study was evaluating the MTA and ZnPo4 cement as barriers to coronal microleakage. Forty single canal extracted teeth, were prepared in a standard manner using GT file, randomly divided into two groups of 20 teeth, and obturated with laterally condensed gutta-percha or MTA. In each group, 10 teeth received a 4-mm barrier of MTA or ZnPo4 cement. The sealing ability of each part was assessed by immersion in 1% methylene blue dye for 72 h. The leakage was recorded in apical and coronal part. Data were analyzed by One-Way ANOVA test, T-test, and LSD test. Canal filled with laterally condensed gutta-percha showed significantly less apical dye penetration than canals obturated with MTA. However, coronal barrier filled with MTA showed significantly less dye penetration than ZnPo4 cement barrier.


Article
Dental Caries and Salivary Streptococcus Mutans in Relation to Primary and Permanent Dentition

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Abstract

Background : Streptococcus mutans has been implicated as a principle microbial agent in the pathogenesis of dental caries. The aim of this study was to compare caries experience and salivary Streptococcus mutans count among groups of children having primary dentition and adults having permanent dentition. Materials and Methods: The sample consisted of 100 children with an age of 4 – 5 years old and 100 adults with an age of 21 – 22 years old in Baghdad city. Dental caries was examined for the whole dentition and bacteriological analysis was done for the salivary sample to estimate the count of Streptococcus mutans in saliva. Results: Caries experience of adults was significantly higher than that of children while salivary S.mutans count was significantly higher among children than the adults. Positive correlation of S. mutans with decayed surface was stronger than that with (dmfs/DMFS) for both children and adults. Conclusion : S. mutans count was significantly higher among children than adults and caries experienc of permanent teeth was significantly higher than that of primary teeth.


Article
New approach in Bisecting angle technique

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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.


Article
Comparing required dislodging forces between different types of posterior palatal seal

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Abstract

Background: In this study forces required to dislodge a maxillary complete denture were compared for different types of posterior palatal seals " Group 1 single beading design , Group 2 double beading design and group 3 with butter fly posterior palatal seal. Materials and Methods :Using a specially designed strain gauge force transducer and strain measuring device ,the force required to dislodge a maxillary complete denture measured and compared. Ten male subjects are selected with age range 55-65 yrs, the primary impression made in the usual manner and the final impression made with zinc oxide euogenol paste after the border seal made with tracing stick impression compound ,then the master cast duplicated using a heavy body silicone impression materials in order to produce a three additional casts, then the casts scraped to incorporate the posterior palatal seals and produce the three groups .a denture base constructed after postdum scraping. Results: Comparing the three groups the results shows that a significant difference found between the group 1 and 2 and group 1 and 3 with no significant difference found between group 2 and 3. Using ANOVA Table with LSD. Conclusion: No Design Provide superior priority than the other type of posterior palatal seals but a double beading and butter fly posterior palatal seal can improve the retention of a maxillary complete denture.


Article
Linear setting expansion of three different types of dental stones Available in Iraqi market , a comparative study.

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Abstract

Aims of the study: To identify the must appropriate type of dental stone produces with minimal setting expansion Materials and methods: Three typee of dental stone compared, two groups produced depending on the mixing ratio so that the setting expansion values obtained by the aids of extensometer then compare them statistically. Results and discussion: Comparing setting expansion within each group the lowest setting expansion found in Elite model stone while the highest value in Silky Rock model, in Q.D. dental stone While comparing the two groups with each other shows no considerable changes take place due to increase in the W/P ratio Conclusion: Increasing the W/P ratio to a considerable limit results in a minimal changes in the setting expansion for Silky Rock stone, while for Q.D. dental stone & Elite model the setting expansion decreased. Heat generated from the mixture didn't affected by the changes in W/P ratio.

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Article
Destructive periodontitis, its prevalence among chronic periodontitis patients, with cohort incentive conditions

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Abstract

Sixty-six patients have been diagnosed and distinguished as having destructive periodentitis out of one thousand slowly growing chronic periodontitis (S.G.Ch.P.), constituted 6.6%, females was 68.18%, male was 31.81%, a significant difference was found between male and female. Possible activating and inverting factors was studied, restraint stress and depression appear having a significant relationship, nutritional factor as well showed a significant influence on inversion of S.G.Ch.P. into DP. High gingival index, sever bone destruction; deep packet and an eventual tooth mobility with generalized distribution pattern were the characteristic clinical feature of the disease. In conclusion local bacterial and systemic conditions either psychic or somatic may interfere in the activation and inversion of the adult periodentitis into destructive periodontitis under the basis of systemic and psychological factors .

Table of content: volume:3 issue:1