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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:2

Article
The Influence of Composite Type and Shade Selection on Depth of Cure of Light-activated Composites

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Abstract

Abstract Background: This study investigated the influence of composite type and shade on depth of cure of light- activated composites. Materials and methods: This study investigated the depth of cure of two composite materials using two different shades. Parameters included two shades (A1 and C3) of two different light-activated composites(Helio Progress and King Dental) cured for 40 seconds. Results: Statistical analysis of the data by using the one-way analysis of variance revealed that, both composite type and shade significantly affect composite depth of cure. Conclusion: This study indicated that, Although, both composite type and shade were significantly affect depth of cure but the effect of composite type on composite depth of cure is much more than that of composite shade.


Article
ROOT REINFORCEMENT USING CAST POST CEMENTED WITH DIFFERENT TYPES OF CEMENTS

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Abstract

The purpose of this in-vitro study is to evaluate and compare the fracture resistance of endodontically treated teeth restored using cast posts cemented with different types of cement. Thirty intact human maxillary central incisors were selected for this study. The crowns were removed and endodontic therapy were done on the roots, which were then prepared to receive cast posts, after their fabrication, the cast posts were cemented with zinc phosphate cement (group I), resin modified glass ionomer cement (group II),and resin cement (group III). The samples were subjected to compressive fracturing loads by a Zwick testing machine at a cross head speed of 5mm/min., with an angle of 45º to the long axis of the tooth. The results showed that the posts cemented with resin cement exhibited the highest mean failure load followed by posts cemented with resin modified glass ionomer cement , while posts cemented with zinc phosphate cement exhibited the lowest mean failure load.


Article
Radiological accuracy of two different systems (Digital & Conventional) in endodontic apical fitness

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Abstract

Aim: The present study compares the accuracy of conventional and digital radiographic system in the determination of apical fitness in endodontic therapy. Method: Thirty three root canals of first upper and lower molar teeth were used in this study; a K-file was inserted into the canal until its tip was fit snuggly one millimeter shorter than the apex. Each tooth was radiographed twice with two different radiographic systems; conventional & digital systems. The right-angle paralleling technique with film holders was used in both systems. The distance between the file tip and the center of radiographical apex from both imaging systems was measured by two examiners and the mean of each two measurements was recorded, the data was collected and analyzed statistically by paired t- test. Results: The mean value of radiographic length reveals that there is a very small difference between the measurements of conventional radiographic system (0.8727mm) and those measurements of digital radiographic system (0.8367mm) when compared with the real length measurements (1mm). Paired t-test shows that there is no significant difference (p < 0.05) was founded between the real measurements and the radiographic measurements are taken from both conventional and digital systems. In conclusion both the conventional and digital imaging systems can be used accurately for working length determination in an endodontic therapy.


Article
The possible numbers of repair can be Carried on the same light-cured Composite resin surface (In vitro study)

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Abstract

on the same light-cured microfilled composite resin (Helioprogress, vivadent, Germany). 40 specimens were prepared, stored in deionized distilled water at 37°C for 24 hours and divided into 4 groups. Group 1: The repair procedure done once. Group 2: The repair procedure done twice. Group 3: The repair procedure done for three times. Group 4: The repair procedure done for four times. All the specimens stored in deionized distilled water at 37°C for 24 hours before testing. A universal zwick testing machine with a special designed chisel was used to evaluate the shear bond strength of the repaired composite resin. The results showed reduction in mean shear bond strength value from group 1 to group 4, furthermore a significant difference was found between group 1 Vs group 3 and group 1 Vs group 4.

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Article
Microleakage evaluation of two types of pit and fissure sealants using two different methods, (in vitro study)

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Abstract

Background: Clinical preventive procedures must be done after careful assessment; one of the major risk factor is the occlusal morphology of the posterior teeth. These caries free fissures must be sealed. This in vitro study evaluated the microleakage of two types of sealant materials (unfilled resin and flowable composite) on enamel surfaces prepared using two methods (acid etching with enameloplasty and acid etching alone). Material and methods: Thirty two extracted human third molar were selected and randomly assigned in to 4 groups of eight teeth each; group A, the occlusal surfaces of teeth were acid etched ,then sealed with concise white sealant; group B, they were acid etched then sealed with wave mv flowable composite ;group C, they were prepared with bur ,acid etched ,then sealed with concise white sealant ;group D, they were prepared by bur, acid etched, then sealed with wave mv flowable composite. The sealed surfaces were stored for seven days in distilled water, then specimens were thermocycled 500 cycles, immersed 24 hours in a 2% buffered methylene blue dye, then sectioned and analyzed for leakage under a stereo microscope. Chi-square test was performed to test the differences of leakage among the four groups. Results: The results showed that there was no significant difference (p>0.05) in microleakage for the same material with and without bur preparation. Concise white sealant produced significantly (p<0.05) less microlaekage than wave flowable composite. Conclusion: under the conditions of the present study, bur preparation (enameloplasty) followed by acid etching produces no less microlaekage than did acid etching alone. Concise white sealant (unfilled resin) demonstrated less amount of microlaekage when compared to wave mv flowable composite.


Article
Concentration of salivary magnesium in relation to dental caries among a group of adults

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Abstract

Magnesium is one of the major cations in plant and animal tissues and is an essential constituent of the bone and tissue, as well as the body fluids. Concentrations of most electrolytes in saliva are subjected to considerable alteration. The aim of this study was to investigate the salivary magnesium in relation to dental caries. A sample of 46 adults was involved with age range of 20-45 years. Samples of stimulated saliva were collected and prepared to be analyzed for magnesium estimation using atomic absorption spectrophotometer. Clinical examination was done for dental caries using WHO criteria. The salivary magnesium concentration was 0.38mg/dl. Neither the sex, nor the age influenced the concentration of magnesium in supernatant stimulated saliva. Negative correlations were found between salivary magnesium and age, salivary flow rate, while, a positive correlation was recorded with dental caries. All these associations were not proved to be significant (P<0.05). Further investigation should be done on whole saliva to clarify the association between magnesium and dental caries. The magnesium relation with the other elements must be considered.


Article
The reliability of Rickett's analysis using cephalometric tracing on Iraqi sample aged 8-10 year

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Abstract

Cephalometric radiographs were taken for (48) subjects with class I occlusion ; (25) females and (23) males , which selected on the standarization of the radiographs. Sample ages range 8-10 years . cephlometric tracing are carried out using the same points, lines, angles and axis of Rickett's analysis. On comparing the results of this research which is carried out on Iraqi sample with Rickett’s analysis on Caucasian people of the same age appears that there are differences in most of these measurements and this due to racial factors and ethnic variations which play a great role in differences between each ethnic group . The results of Iraqi measurements (mean values ) as fallows:- facial axis (Y-axis) =91.3°; facial depth angle =81.2° ; Frankfort-mandibular plane angle=30°; convexity of point A (mm)=2.7mm; lower incisor to A-pog =1.8mm;angle =26.1° and finally ANS-Xi-Pm angle (lower facial height) = 45.8°.


Article
scientific and Radiographical Evaluation of Amalgam and Mineral Trioxide Aggregate as a Retrograde Filling in Periapical Surgery By Using Ultrasonic Device

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Abstract

Background: This study is to compare between Amalgam and Mineral Trioxide Aggregate as retrograde filling in the healing process of periapical surgery by clinical and radiographical evaluation. Material and method: A follow up study of twenty patients, eleven were females, nine were males, of average age (12-36) years old, with forty upper central incisors involved with chronic periapical lesions, each patient has two central incisors with two separated periapical lesions, the right side was apically filled with Zinc free Amalgam and named as a control group (Group A), and the left side was filled with MTA as a study group (Group B). All patients were recalled within three months and six months, and subjected to clinical and radiographical examinations, to evaluate the healing process of both groups. Results: Clinically the study shows three failure cases (7.5%), one case (2.5%) was objectively failure which shows sinus formation in Amalgam group and two cases (5%) were subjectively failure, which shows pain and tenderness, one case in each group. Radiographically, the study reported a remarkable bone formation 27 cases (67.5%), fifteen cases in MTA group and twelve cases in amalgam group after six months. While 10 cases (25%), showed delayed bone formation, four cases were in MTA group and six cases were in Amalgam group, and three cases (7.5%) were showed enlargement in the size of radiolucency, one case in MTA group and two cases in Amalgam group. According to the follow up during the six months, the MTA group showed higher successful rate than Amalgam group, and the failure cases in group A was 10% and 5% in group B. Conclusions: The study shows that the best results are in those patients who have failure in root canal filling, and in those patients who did not have labial sinus formation and labial cortical bone perforation. MTA group, shows decreased in (Mesio-Distal, Superio-Inferior dimensions and cavity surface area), faster than the Amalgam group.


Article
Alveolar Bone Loss in Adult Young Patient Seeking Periodontal Treatment (Radiographic Study)

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Abstract

Abstract Thorough clinical and radiographic examination is necessary to detect, evaluate and diagnose periodontal disease. The aim of present study is to evaluate interdental bone loss in patients with chronic adult periodontitis radiographically. One hundred eighty sites (for maxillary anterior teeth only) were examined for type and severity of alveolar bone loss. The results reveal that 80% of all examined sites had different severity of bone loss. Mild bone loss was more frequent than Moderate or Severe and horizontal more than vertical or angular bone loss. Interdental bone between central and lateral incisors was the most affected site in this study.


Article
Effects of Prenatal metallic mercury vapor exposure on the developing teeth of rats

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Abstract

This Study represents an attempt to investigate histologically the effect of metallic mercury vapor on the developing rat teeth after inhalation by pregnant rats . In this study albino – wistar rats were used and divided into control and experimental groups. The control group consisted of 8 pregnant rats, and the experimental group consisted of 12 pregnant rats. Then 20 born rats from the control group and 20 born rats from the experimental group were selected to be sacrificed at the ages of (3&13) days. The specimens were prepared for processing and staining with haematoxylin and eosin, and examined under light microscope. Results showed no histological abnormalities in the dental tissue of the experimental group when compared to that of the control group . This Study represents an attempt to investigate histologically the effect of metallic mercury vapor on the developing rat teeth after inhalation by pregnant rats . In this study albino – wistar rats were used and divided into control and experimental groups. The control group consisted of 8 pregnant rats, and the experimental group consisted of 12 pregnant rats. Then 20 born rats from the control group and 20 born rats from the experimental group were selected to be sacrificed at the ages of (3&13) days. The specimens were prepared for processing and staining with haematoxylin and eosin, and examined under light microscope. Results showed no histological abnormalities in the dental tissue of the experimental group when compared to that of the control group .


Article
The effect of denture cleaners on Tensile Strength and Indentation hardness of denture base materials Raghdaa

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Abstract

Background: Denture cleaner solutions are used extensively for the cleaning of prosthesis both plastic and metallic component .The chemical composition of cleaner solution are virtually important in defining their adverse effect on properties of acrylic part of prosthesis Aims of the study The present study carried out to study the effect of some cleaning solution on tensile strength and indentation hardness of both types of acrylic resin (hot and cold cured) and compare the effect on different types of denture materials. Materials and methods: Specimens of hot and cold cured acrylic resin were prepared according to ADA specification for both indentation hardness and tensile strength test. The specimen were immersed in distilled water for seven days then were left in containers containing one of the following denture cleaners, Staradent 1%H202, 5%HCL& vinegar solution. Each container contained five specimens of either heat cure or cold cure with one type of denture cleaners and they were left for seven days. Specimens were then tested for indentation hardness and tensile strength test. Results: The results showed that Vinegar solution has an deleterious effect on tensile strength and indentation surface hardness of hot cured acrylic resin as compared with control while for cold cure all specimens affected by all cleaning solutions.


Article
Evaluation of the effectiveness of newly designed motor-driven fiberglass burs versus hand instrumentation in open root planing

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The present study was performed to evaluate the effectiveness of newly designed motor-driven fiberglass burs in root planing and compare it to manual instrumentation using universal curette. Twelve patients complaining from periodontitis with deep periodontal pockets were involved in this study. A total number of 139 pocket sites received root planing by motor-driven fiberglass burs and 131 pocket sites were planed manually by curette. The root planing procedure was opened type; it was performed by modified widman flap operation. The clinical parameters that were used in this study are (plaque index, bleeding on probing, probing pocket depth and relative attachment level). They were recorded in 4 periodic visits 2 of them before treatment and 2 after treatment to assess the improvement and to make a comparison between the two methods of treatment. The results revealed that there was a significant improvement in all of the clinical parameters after treatment with fiberglass burs. Also the results showed that that there was no significant difference between the improvement that was implemented by the two methods of treatment.

Table of content: volume:3 issue:2