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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: 2010 volume:7 issue:2

Article
In vitro evaluation of sealing ability of matched-taper single cone obturation with an electrochemical method.

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Abstract

Abstract widespread use of rotary Nickel-Titanium systems has caused manufacturers to produce gutta-percha cones that match the taper of the canals prepared with these systems. The aim of this study was to use electrochemical method to compare the apical sealing ability of taper single-cone, Thermafil obturation in canals prepared with ProTaper and ProFile instruments. Forty extracted human mandibular premolar were divided into 2 groups. All canals in group (A) prepared with ProFile, while all canals in group (B) prepared with ProTaper. Each group subdivided into two subgroup according to the method of obturation, (Thermafil and matched taper- single cone).The apical leakage in these groups was evaluated using an electrochemical method. T-test showed a non significant difference between Thermafil and matched taper-single cone obturation technique in the same group. A significant difference was found between ProTaper and ProFile group in both obturation techniques.


Article
Assessment of shear bond strength of Polycarboxylate cement reinforced by different amounts of Hydroxyapatite

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Abstract

This study was done to assess bond strength of Polycarboxylate cement reinforced by different amount of Hydroxyapatite. In this study a hydroxyapatite materials were added to Polycarboxylate cement at different ratios;10%, 15%, 20%, 25% and 30% ( by weight ) and the bond strength was detected by construction a cylinders from these mixed materials, constructed on exposed dentine of human extracted premolar teeth and by Zwick’s universal testing machine the bond strength were detected for these mixed materials. Results showed that the Polycarboxylate reinforced by hydroxyapatite has higher bond strength than conventional Polycarboxylate cement and the hydroxyapatite powder to Polycarboxylate cement powder ratio by weight best to be 20%. The addition of hydroxyapatite to conventional Polycarboxylate cement increased its bond strength to dentine.

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Article
The effect of 30% at-home bleaching on surface hardness of esthetic restorative materials

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Abstract in vitro study to evaluate the effect of an at-home bleaching product on the surface hardness of three composite restorative materials. The aim of this study was to evaluate the effect of at-home bleaching on the surface hardness of the tooth colored restorative materials. Thirty specimens were prepared; 10 specimens of each material 5 specimens control of each group. All specimens were stored in distilled water at room temperature for 24 hrs before testing. A universal testing machine (Micromet micro hardness testers) was used for testing brinell surface hardness for the three groups& for every tested material. Three tested materials was assessed by ANOVA& further exploration between all possible paired combination of tested material was assessed by bonferroni adjusted t-test p value less than 0.05 was considered statistically significant . The statistical analysis showed that at home bleaching technique have statistically significant effect of the micro hardness of composite resin. At-home bleaching agents have a softening effect on some tooth colored restorative material, and the patient must be aware before using them


Article
Dental Erosion in 10 – 12 Year Old Children in Mosul city

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Abstract

Abstract The aim of this study was to determine the prevalence of dental erosion among 10-12 year old children in Mosul city, mean erosion in teeth and surfaces, amount of carbonated beverages and fruit juice consumed in the sample, and the correlation between dental erosion and some variables. Total sample consisted of 400 children derived from different primary schools in the city center. Examination was performed according to tooth wear index by Smith and Knight 1984 modified by Millword et al 1994. Results showed that dental erosion was highly prevalent 74.2% in the sample, increasing with increasing age, with boys showing a higher prevalence in dental erosion compared to girls with significant difference. Mean erosion scores for primary teeth were slightly less then permanent teeth, with a significant difference between 10 and 12 years of age for both dentitions. Buccal/labial surfaces exhibited more erosion, followed by lingual/palatal and finally occlusal /incisal surfaces, with boys showing more erosion in all surfaces than girls. A large proportion of the sample consumed carbonated beverages 3-5 /week with boys consuming more than girls as seen in the erosion group, fruit juice was also largely consumed by the sample, especially the group that showed erosion. A positive correlation was found between erosion, level of father’s education, time of drinking, method, amount of carbonated beverages and fruit juice consumed. Preventive measures are considered to be the only effective course of management of dental erosion, by reducing intake of carbonated beverages and fruit juice, also modification of erosive drinks, medicines and foods may prove to be an acceptable future strategy world wide


Article
Bite force in Iraqi children in relation to teeth contact and mandibular incisors angulation

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Abstract

Clinical and animal experiments have demonstrated the role of masticatory muscle function in normal and abnormal dentofacial development. This study was aimed at observing the role of antagonistic tooth contacts in the value of maximum bite force among a sample of Iraqi children and to seek the existence of a correlation between maximum bite force and the angulations of the mandibular incisors. Maximum bite force was measured in 46 children (23 males and 23 females). The teeth that occluded with its antagonist were counted clinically and the children were then classified as those with full contact of opposing teeth and those with partial contact. The angle of inclination of the mandibular incisors was obtained by cephalometric lateral views for each child. Maximum biting force was higher in children with full contact of teeth than in children with partial contact of teeth. The difference was statistically insignificant. A clear correlation existed between maximum bite force and the angulations of the mandibular incisors. Maximum biting force affected the inclination of the mandibular incisors. No difference was found in the value of maximum biting force between patients with full contact of teeth and those with partial contacts.


Article
Evaluation of Upper Canine Eruptive Course: A Radiographic study

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Abstract

Abstract Early detection of upper canine eruptive problems, give a better chance for the preventive steps to be taken. 328 maxillary canines in pre-emergence phase, were studied on the bases of (164) panoramic radiographic records of Iraqi children age 5- 12 years (72 boys - 92 girls). Canine inclination (CI) (relative to a plane between the suborbital points), and its relation to the lateral incisor (CLR) were studied. The lateral incisor developmental stage (LID) was evaluated too. Results showed that, in initial stages of (LID), the canine lateral incisor relation (CLR) is almost characterized by overlapping, a situation rarely seen in the final stages. Only 8-15% of the overlapping is found when the lateral incisor was completely developed (CO), detecting possible canine anomalies in this stage, especially when associated with other clinical signs as non-palpation of the cuspid bulge in the alveolar process. Then extraction of the primary canine is advised to prevent impaction


Article
Effect of Selected Metal Salts on the Microscopical Feature of Initial Carious - Like Lesion of PermanentTeeth (AN IN VITRO STUDY)

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Abstract

This study was designed to assess the microscopical changes of the enamel surface before and following the treatment with different concentration of metal salts, involving zinc, strontium, magnesium, in addition to stannous fluoride and de-ionized water as the control. Microscopic examination was conducted on teeth samples before and following pH-cycling procedure and following the treatment with the selected metal salt under polarized microscope (100X). The best obvious remineralization was found following treatment with stannous fluoride, followed by zinc chloride. Samples treated with strontium chloride showed rather poorly mineralized surfaces. No signs of mineralization were observed for samples treated with magnesium chloride. Although stannous fluoride was the best in the remineralization of initial caries, results for other metals seem to be promising if used for prevention of dental caries

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Article
Evaluation of the effect of different surface treatment on the transverse strength of the repaired acrylic denture base resin cured by two different techniques

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Abstract

One of the most important practical deficiencies of present denture base materials is fracture, therefore many attempts have been made to reinforce of the repaired denture base resin, a desirable objective for this service is to obtain optimum strength for repair, which can be achieved by making available a good bound between original and repair materials. The present study was carried out to evaluate and compare the effect of different surface treatments (monomer, acetone, combination monomer + acetone) on the transverse strength of acrylic denture base. Seventy (70) specimens were prepared from pink heat-cure acrylic resin of which (10) specimens were considered a control group. The remaining specimens were divided into two main groups (30specimens repaired by Ivomat and 30 specimens repaired by air method). The joint treated before cold-cured acrylic resin was applied to the joint space. Specimens were repaired by cold-curing resin (major). Then they were stored in distilled water at (37 Co) for (48) hours. These were subjected to three-point loading testing machine to determine the transverse strength. The results showed that air cured acrylic resin has significant lower transverse strength than Ivomat cured acrylic resin also show that the specimen treated with (Acetone + monomer) have a higher transverse strength. Finally, it can be concluded that curing methods and surface treatment will improve transverse strength of the repaired acrylic denture base resin.

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Article
The Effect of Denture Cleanser Materials on Impact Strength of Heat Cure Acrylic Resin

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Abstract

Acrylic denture base is the part of the denture that rests on the foundation tissue & to which the teeth are attached. The main objective of this study was to determine the effect of different cleansers solution on the impact strength of heat cure acrylic resin. Thirty (30) rectangular shape samples from acrylic were prepared with dimension of (55 mm *10 mm *2.5 mm) length, width& thickness .The acrylic was fabricated in the same conventional way for construction base palate. All the specimens were examined by vernier before immersion in solution to check the size of each samples, the samples were divided into three group (A, B& C) each group contain ten samples. The samples in first group (A) were immersed in distilled water, the samples in second group (B) were immersed in peroxide solution, while the sample in the third group (C) were immersed in prepared cleanser solution (citric acid).After period of immersion (for 3 week & 15 minutes every day).Finally each samples rinsed by distilled water & cleaned thoroughly by apiece of cotton before testing. The impact strength was tested in chapy impact machine. The statistical analysis of the results showed that there was no statically significant difference in impact strength value among the testing groups. This means that the all cleanser solution that were used in this study had no effect on the impact strength.

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Article
The Effect of Removable Partial Denture and Salivary Changes during Pregnancy

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Abstract

The calcium, inorganic – phosphate of 20 pregnant women with age (20 – 45) years wearing removable partial denture divided into 3 trimester and 10 women married non pregnant as control. In resting saliva the concentration of calcium not changed significantly in pregnant women, and inorganic – phosphorus found not to be changed significantly. The aim of this study was to see the pregnancy related change in human saliva and relation to the oral findings and effect of wearing removable partial denture.

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Article
The clinical results of buccal advanced flap for the closure of oroantral perforations

Authors: Dr.Lukman F.Omar د. لقمان عمر
Pages: 225-234
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Abstract

Aim of this study was to evaluate the success of buccal sliding flap used in the reconstruction of oroantral defects, and clarify its indications and size limitations. In this prospective clinical study, buccal Sliding flap was used for closure of oroantral defect in 23 patients with different indications which included; 4 defects resulting from maxillary cysts (radicular and residual cyst) ,12 newly created medium size oroantral communications, 7 cases with chronic oroantral fistula. The defect diameter range between 3-8 mm. Patients were evaluated for signs of flap epithelialization, infection, and fistulae recurrence. The epithelialization process was completed in 19 patients after 2 weeks without any complication. However, partial dehiscence of the flap occurred in 4 patients with chronic oroantral fistula. The results of this series support the view that the use of buccal sliding flap is a simple, convenient, and reliable method for the reconstruction of small to mediumsized oroantral defects with minimum complications.


Article
Evaluation of dental health and thickness of mandibular inferior cortex among menopaused Iraqi cigarette smokers sample by the aid of using digitapanoramic radiography

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Abstract Smoking is linked to osteoporosis through its anti-estrogenic effect in women which results in premature menopause in smokers and increased bone resorption is correlated with estrogen loss in menopause women. The aim of this study is to evaluate the effects of smoking and hormonal changes on the thickness of mandibular inferior cortex and the dentition status in both maxilla and mandible (DMFT) in menopausal females and to estimate the value of panoramic radiographic findings in assessing the possibility of latent osteoporosis. Panoramic images for 80 healthy, median stature, smokers and non-smokers Iraqi female subjects aged (20-35) years premenopausal and (45-60) years menopause was done, then the thickness of mandibular inferior cortex and (DMFT) was evaluated. The results showed that panoramic radiographic measurements are considered as indicator of bone turnover and the dentist is able to identify smokers and non-smokers postmenopausal females with increase risk of osteopenia and osteoporosis by using dental panoramic radiography which is a simple valuable screening tool.


Article
The Detection of Human Papilloma Virus- 16, in Oral Squamous Cell Carcinoma by in Situ Hybridization

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Background: Squamous cell carcinoma of the oral cavity constituted a major health problem and can be a leading cause of death. Several studies link high risk Human papillomavirus -16 to oral squamous cell carcinoma as an important etiological factor. Several molecular markers have also been the subject of an intense research work, trying to clarify their role in oral carcinogenesis. Of these, the cancer suppresser gene P53 has been extensively studied. Aim of the study: to detect the association of the molecular markers Human papillomavirus -16, in the oral Squamous cell carcinoma using in situ hybridization technique and To correlate Human papillomavirus -16 with clinical data (age, sex, risk factors grade &stage). Material & Methods: Tumor tissues from 33 patients with newly diagnosed as oral squamous cell carcinoma & who were surgically treated collected, formalin fixed & paraffin embedded. Sections on charged slides were made from each tissue block and submitted to in situ hybridization technique utilizing Human papillomavirus -16, cDNA probe. Results: Human papillomavirus -16 was localized by in situ hybridization specifically within the nuclei of cancer cell it was detected in (27) (81.8%) of 33 oral squamous cell carcinoma patients. Most of Human papillomavirus -16 positive patients were within the age group (50-59) years. However, there was no significant correlation between Human papillomavirus -16 positive &age. No significant correlation was found to sex &risk factors (smoking &alcohol consumption) either. Most of cases were moderately differentiated squamous cell carcinoma (79%). however no significant correlation was detected regarding histopathological grading or clinical staging with Human papillomavirus -16. Conclusions: Oral HPV-16 infections are strongly associated with OSCC. Among subject with or without the established risk factor of tobacco& alcohol use


Article
Hyalinization of dental pulp tissue due to occlusal trauma (Experimental study)

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Abstract Dental pulp tissue is a highly specialized conneclive tissue contains a formative and protective cells that can be affected easily by stimuli such as occlusal trauma subjected by occlusal overhang filling. Sixteen albino rats aged range (6-8 months) weight range (0.5-0.75 kg) were subjected the occlusal overhang filling made for upper first molar for 2 periods, and according the periods, rats divided in the 2 groups. Groups I (8rats) subjected for occlusal trauma for 2 weeks duration group II (8rats) subjected for occlusal trauma for 8 weeks duration. Histological evaluation have been done for 2.8 weeks using hematoxyline and eosin stain. Occlusal trauma for 2 weeks in group I showed wide irregular predentin formation will displacement in odontoblast cell. While in group II for 8 weeks duration, histological feature for pulp tissue showed hyalinization (50-95 μm) in length. Occlusal trauma for long period cause hyalinization of pulp tissue that negativelyinfluence on endodontic treatment in future.


Article
Fungal Infection Associated with denture

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Abstract Candida is a genus of yeast .Many species of this genus are symbiont of animals host including humans. While usually living as commensally in oral cavity, some candida can cause disease .The most significant member of the genus is candida albicans which can cause infection called candidiasis or thrush especially in elderly denture wearers.So the denture seems to be frequently the sources of fungal infection. The current study aimed to determine the fungal prevalence rate in oral cavity among denture wearers patients in comparison to those without dentures and also to determine the local risk factors includes trauma due to ill fitting denture, nocturnal wear of the denture, heavy smoking and the age of the denture. The result of this study showed that the prime etiology of candida growth was the material of prosthesis itself. 57% of the denture wearers showed growth of candida while 22% of subjects who had their own dentitions showed candida growth that the prosthesis is the dominant etiological factors in candida growth other local factors must be considered.

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Article
Association between periodontitis and the main components of metabolic syndrome

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Abstract The prevalence of metabolic syndrome (MetS) is increasing worldwide, and it appears to increase independently the risk of cardiovascular disease. Periodontitis has been shown to have an association with the risk of cardiovascular disease. The aim of the present study is to investigate the association between periodontal status and the main components of metabolic syndrome, singly, and in combination in type 2 diabetic patients. One hundred and seventy five patients (96 males and 79 females) with type 2 diabetes mellitus (T2DM) were enrolled in the study. The following clinical characteristics were reported: age and gender, body mass index (BMI) and blood pressure. Periodontal status was assessed using periodontal disease index which includes plaque, calculus, and periodontal component of the index. An assessment of serum lipid analytes included estimation of serum triglycerides (TG) and serum high density lipoprotein cholesterol (HDL-C). There was a significant difference in mean value of periodontal disease index (PDI) between normotensive and hypertensive diabetic patients (3.31±0.83 vs. 3.82±0.65, P<0.001). Also there was a significant difference in PDI between normal and high TG groups (3.49±0.73 vs. 3.81±0.61, P<0.01). There was a significant increase in TG level in hypertensive compared to normotensive diabetic patients (P<0.01). Only in presence of hypertension and obesity in addition to diabetes that PDI was significantly increased in comparison with diabetic hypertensive non obese patients (4.1±0.58 vs. 3.62±0.64, P<0.001). There were no significant differences in TG level between obese and non obese diabetic patients while there was a significant increase in TG level in patients who were hypertensive obese compared to normotensive non obese (174.64 ±61.39 vs. 150.80±54.96 respectively, P<0.05). Presence of two or more characteristics of MetS has resulted in a significant increase of PDI when compared with patients who had only diabetes (P<0.001). In conclusion, hypertension and hypertriglyceridemia as main components of MetS are singly associated with periodontitis in T2DM and the presence of any two studied components of MetS in addition to diabetes will attain the worst deterioration in periodontal status.


Article
The usefulness of Ramfjord teeth to represent the full-mouth pocket depth in epidemiological study

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Partial recording of indices of periodontitis have long been used in clinical and epidemiological studies to predict full-mouth situation. The two most widely used partial recording indices for periodontal surveys are the community periodontal index of treatment needs (CPITN) and the Ramfjord teeth. The aim of this study was to evaluate the usefulness of Ramfjord teeth in predicting the full-mouth periodontal status of an adult population in patient attending the collage of dentistry- Baghdad University. The study participants were 240 patients we divide them into three main groups according to the age of the patients and each group were divided in to two sub groups according to the sex of the patients. Pocket depth was measured in millimeters with periodontal probe The difference in the mean pocket depth measured from the full mouth(F) and Ramfjord teeth(R) by using paired t - test was non significant in all the groups. Also in all groups the correlation coefficient as well as beta coefficient was high The high agreement between Ramfjord teeth and full mouth periodontal pocket depth confirm the epidemiological validity of Ramfjord teeth to represent the full mouth.

Table of content: volume:7 issue:2