Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Microleakage Evaluation of a Hydroxyapatite Base in Comparison with a Resin Modified Glass Ionomer Cement in Vitro
152
158
EN
Sepideh
Banava
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, Azad University. Tehran, Iran
sbanava@yahoo.com
Y
Parisa
Poorbaghi
Dentist
N
Saeid
Nemati Anaraki
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, Islamic Azad University. Tehran, Iran
N
Farzaneh
Aghajani
Member of Dental Materials Reference Lab, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran
N
Soheil
Noohi
Dentist
N
Mohammad javad
Kharrazifard
Dentist, Epidemiologist, Member of Research Center of Dental Faculty, Tehran University of Medical Sciences. Tehran, Iran
N
Hosain
Inanloo
Postgraduate Student, Department of Restorative Dentistry, School of Dentistry, Azad University. Tehran, Iran
N
Background and Aim : Many attempts have been done to improvethe quality,properties and composition of dental materials to decrease the microleakage and its consequences.The objective of this invitro study was to compare microleakage of light cure resin modified glass ionomer cement and a hydroxyapatite containing base .
Materials and Methods : In this experimental study 40 intact human premolars were divided into 4 groups. On the buccal surface of each tooth, around cavity was prepared with 3 mm in diameter and at least 1 mmdeep into dentin.Teeth were restored using L.C resin modified glass ionomer lining cement,L.C resin modified glass ionomer restorative cement, Lime-Lite with bonding agent, and Lime – Lite without bonding agent.After thermocycling the specimens were immersed in AgNO3 solution for 2 hours.After sectioning the specimens, dye leakage wad evaluated by a stereomicroscope. Microleakage was graded according to ISO 11 405 in occlusal and gingival cavity margins. Obtaineddata were statisticallyanalysed by Kruskal-Wallis, Wilcoxon and Mann-Whitney tests .
Results : Most of the samples in group 3 (lime – lite with bonding agent) demonstrated zeromicroleakage grades in gingival and occlusal cavity margins and in group 4 (Lime – Lite – without bonding agant) the majority of samples showedgrade 3 microleakagein both margins. These findings is both margins were significantly higher than those of other groups (p< 0.05), but there were not significant differences among glass ionomer groups in marginal microleakage (p> 0.05 ).
Conclusion : Hydroxyapatite containing base showed more microleakage compared with glass ionomer cement, but application of a bonding agent prior to its placement was effective in reducing its microleakage .
Microleakage , Glass Ionomer , Hydroxyapatite cement
http://jida.ir/article-1-1276-en.html
http://jida.ir/article-1-1276-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Predictors of Tooth Brushing Behavior in Iranian Adolescents: an Application of the Planned Behavior Theory
159
163
EN
Amir
Pakpour Hajiagha
Assistant Professor, Public Health Department, School of Health, Qazvin University of Medical Sciences. Qazvin, Iran
Pakpour_Amir@yahoo.com
Y
Mohsen
Saffari
Assistant Professor, Health Education Department, School of Health, Baqiyatallah University of Medical Sciences. Tehran, Iran
N
Background and Aim: Contrary to thetheory of planned behavior (TPB), intention alone is not sufficient to predict behavior. The aim of the study was application of anextended model of planned behavior in predicting dental brushing behavior among a sample of adolescents in Qazvin .
Materials and Methods: A number of 383 adolescents participated in thiscross-sectional study. Attitude, subjective norm, perceived behavior control, action and coping scales and a self report questionnaire regarding dental brushing behavior was completed by the adolescents. Data were analyzed by a confirmatory factor analysis (CFA) on an original six-factor structure (attitude, subjective norms, perceived behavior control, intention, action plan and coping plan) and also a hierarchical linear regression analysis .
Results: The mean age of the adolescents was 15.41 years. The most of the student were male (50.2). The CFA for the original six-factor structure showed a good fit index (λ2 = 645.25, degrees of freedom df=309, goodness-of-fit index (GFI) =90, root mean squared error of approximation (RMSEA) =0.054). Action- and coping planning aggregately accounted for 11.1% of the variance associated with dental brushing behavior .
Conclusion: Results obtainedform CFA analysis approved the six-factor structure including intention, action plan and coping plan . Action plan and coping plan can reduce intention-behavior gap .
Oral health , Adolescents , Theory of planned behavior , Planning
http://jida.ir/article-1-1277-en.html
http://jida.ir/article-1-1277-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Microleakage of Self-Adhesive Resin Cements Compared With Resin Cements Containing Etch & Rinse Adhesives
164
170
EN
Haleh
Heshmat
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, Azad University. Tehran, Iran
h_heshmat@yahoo.com
Y
Maryam
Hoorizadganjkar
Assistant Professor, Department of Restorative Dentistry, School of Dentistry, Azad University. Tehran, Iran
N
Saeid
Zeinali
Dentist
N
Farzaneh
Aghajani
Member of Dental Materials Reference Lab, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran
N
Background and Aim : Current self-adhesive resin cements have become popular for esthetic restorations. The purpose of this study was to compare the microleakage of 2 self-adhesive resin cements and 2 etch and rinse versions of the same brands .
Materials and Methods : Forty human third molars were randomly assigned to 4 experimental groups: 1-Rely X Unicem, 2- Rely X ARC+ Acid etch 37% + Single Bond ,3- Nexus 3 Acid etch 37% + Optibond Solo, and 4- Maxcem Elite. Microleakage of the specimens were then measured with a four point scoring system at both the cervical &occlusal areas, with the aid of a stereomicroscope. Microleakage scores were compared using Kruskul-Wallis analysis, followed by relative Dunn test .
Results : The microleakage of Rely X Unicem and Nexus 3 were significantly less in the occlusal region (P<0.05), whereas in the cervical area there was no significant difference in microleakage between Rely X Unicem and Rely X ARC (P= 0.0087). The microleakage of Nexus 3 was significantly less than that of Rely X Unicem.Maxcem Elite showed the highestlevel of microleakage (P<0.05 ).
Conclusion : Microleakage of both cements using etch & rinse adhesive systems were significantly lower in comparison withtheir self- etch counterparts both at the cervical &occlusal areas. (P< 0.05 )
Microleakage , Self-Adhesive Resin Cement , Dentin Adhesion , Enamel adhesion
http://jida.ir/article-1-1278-en.html
http://jida.ir/article-1-1278-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Comparison of Temperature Changes Through Dentin Discs with Different Thicknesses and Different Distances of Light Curing Tip by Two Different Light Curing Units
171
176
EN
Mehrdad
Barkatayn
Assistant Professor, Department of Operative Dentistry, School of Dentistry, Azad University. Khorasgan Branch, Iran
N
Mohammad reza
Malekipoor
Assistant Professor, Department of Operative Dentistry, School of Dentistry, Azad University. Khorasgan Branch, Iran
N
Samaneh
Alaei
Postgraduate Student, Department of Operative Dentistry, School of Dentistry, Azad University. Khorasgan Branch, Iran
samaneh_alaei@yahoo.com
Y
Maryam
Kavoosi
Dentist
N
Background and Aim : Excessive heat produced while curing of light-activated dental restorations may cause irreversible damage to dental pulp. The Aims of this study wereto measure the temperature rise(TR) induced by two different light curing units and to evaluate the relathionship between the measured TR in dentin discs of different thicknesses and different distances of light guide tips from dentin disc .
Materials and Methods : In this experimental study, Quartz-Tungsten-Halogen (QTH) (400 ) and Light-Emitting Diode (LED) systems (1500 ) were used as the curing units. Dentin discs of 0.5, 1.0 and 1.5 mm thicknesses were prepared. Distances of 1,2 and 3 mm from the tip of the light guide and dentin discs were set. Temperatures were recorded using a digital laser thermometer. Data were statistically analyzed using two-way ANOVA, Duncan and T-test .
Results: Results showed that both dentin thickness and distance between tip of curing units and dentin disks had significant effects on temperature rise in both curing units (P<0.001 ).
Conclusion : LED produced the highest and the QTH the lowest TR for all tested conditions. Reduced thermal insults were related to increased dentin thickness, increased distance between the light guide tip and dentin, and decreased energy emitted from the light-curing unit .
Temperature , Curing lights , Dentin
http://jida.ir/article-1-1279-en.html
http://jida.ir/article-1-1279-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Serum Vitamin A Level in Patients with Recurrent Aphthous Stomatitis Compared With Healthy Individuals
177
180
EN
Arash
Azizi
Associate Professor, Department of Oral Medicine, School of Dentistry, Azad University. Tehran, Iran
drarashazizi@yahoo.com
Y
Samira
Shahsiah
Assistant Professor, Department of Endodontics, School of Dentistry, Ahwaz University of Medical Sciences
N
Maryam
Ahmadi
Dentist
N
Background and Aim: Recurrent aphthous stomatitis (RAS) is the most common oral mucosal inflammatory disease, with unknown etiology. Antioxidants are able to preserve molecules from damage and also can delay the start of RAS. The aim of this study was to determine serum level of vitamin A as an antioxidant in RAS patients compared with normal subjects .
Materials and Methods: The total 38 subjects were divided into two groups of 19. One group consisted of aphthous patients and the other comprised of healthy subjects. The groups were matched by sex and age. Serum levels of vitamin A were measured in both groups. Finally data were analyzed with T tests .
Results: The mean and standard deviation of serum vitamin A was 13.63±2.3 µg/ml in RAS group and 23.9±4.5 µg/ml in control group. There was a significant difference between the two groups (p<0.05 ).
Conclusion: It was shown that serum levels of vitamin A in RAS patients were lower than that of normal individuals .
Recurrent aphthous stomatitis , Antioxidant serum , Serum vitamin A
http://jida.ir/article-1-1280-en.html
http://jida.ir/article-1-1280-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Ergonomic Evaluation of Work Conditions in Qazvin Dentists and its Association with Musculoskeletal Disorders Using REBA Method
181
186
EN
Sakineh
Varmazyar
PhD student , Department of Occupational Health, School of Medicine, Tarbiat Modarres and faculty of Qazvin University of Medical Sciences. Qazvin, Iran
N
Morteza
Amini
MS Student, Department of Occupational Health, School of Medicine, Tehran University of Medical Sciences. Tehran, Iran
M_Amini87@yahoo.com
Y
Mehdi
Kiafar
Occupational Health Expert
N
Background and Aim: Dynamic and static activities in dentistry, cause musculoskeletal disorders but dentists do not have enough awareness about effects of ergonomic factors on their health. T he aims of this study were to assess ergonomic conditions in dental workstation in Faculty of Dentistry, Qazvin University of Medical Sciences, using REBA method, to investigate the relationship between REBA scores and musculoskeletal disorders and finally, to present corrective solutions .
Materials and Methods: In this cross-sectional study posture assessment of 63 participants were implemented by the REBA method. In order to investigate incidence of musculoskeletal disorders, the standard Nordic questionnaire was used. Data were processed using regression and chi-square tests and the significance level was determinate at P< 0.05 .
Results: The results indicated that 30.2% of participants obtained from11 to 15 scores (very high risk level). Results of the Nordic questionnaire indicated that the highest musculoskeletal disorder report was related to neck region with 50.8 %.
Conclusion: The results showed that 30.2% from the final REBA scores had very high risk level and 51.7% high risk level means that essential corrective and urgent corrective measures are required respectively .
Dentistry , Musculoskeletal disorders , Questionnaire , Ergonomics
http://jida.ir/article-1-1281-en.html
http://jida.ir/article-1-1281-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
An In Vitro Comparison of Antimicrobial Effect of Nanosil and ChlorhexidineMouthrinses
187
191
EN
Vahid
Esfahanian
Assistant Professor, Department of Periodontology, School of Dentistry, Azad University. Isfahan, Iran
N
Ferida
Mohamadi
Dentist
Ferida_m@yahoo.com
Y
Shahram
Amini
Assistant Professor, Department of Periodontology, School of Dentistry, Azad University. Khorasgan, Iran
N
Background and Aim: Regarding chemical methods of plaque control, use mouthrinses are more frequent than other methods. The objective of this research is making a comparison between the antibacterial effect of Nanosil and chlorhexidine mouthwashes .
Materials and Methods: In this experimental study samples were taken from supragingival and subgingival plaques of 15 patients and transferred to aerobic and anaerobic liquid culture environments. The number of the bacteria in both aerobic and anaerobic liquid environments were determined by spectrophotometer. Then, the samples were transferred from the liquid culture environment to the considered solid culture environment as a mixture of nanosil and chlorhexidine mouthwashes and placebo and the numbers of the growth colonies in the solid culture environment were counted in each group and compared with each other by t test .
Results: In both aerobic and anaerobic conditions, the number of the growth colonies, was depicted in ascending order the groups of chlorhexidine, nanosil, and placebo. Concerning chlorhexidine, there was no significant difference between the growth colonies in the two aerobic and anaerobic environments indicating the absolute antibacterial effect of this mouthwash.
Nanosil mouthwash had a significant statistical superiority in comparison with the placebo in both aerobic and anaerobic environments. Nanosil had a significant effect on anaerobic environment, meanwhile, the placebo indicated a superior effect in anaerobic environment .
Conclusion : Nanosil mouthwash can be applied as an effective antibacterial substance especially in an anaerobic environment, though chlorhexidine as a standard mouthwash has still the strongest effect in this field .
Dental plaque , Mouth wash , Nanosil , Chlorhexidine digluconate
http://jida.ir/article-1-1282-en.html
http://jida.ir/article-1-1282-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Contribution of Iranian Researchers in Dental Science Production as Indexed in Web of Science From 2000 to 2009
192
196
EN
Neda
Zeraatkar
MA in library and information science, of Regional information center for Sciences and Technology. Shiraz, Iran
N
Narges
Vara
School Member of Regional information center for Science and Technology. Shiraz, Iran.
N
Seyed Javad
Ghazi Mirsaeid
Assistant Professor of Medical Library; information S Department of Sciences Dept. School of Allied Health Sciences. Tehran University of Medical Sciences & Member of Heath Information Management Research Center
jghazi37@gmail.com
Y
Background and Aim : Nowadays the most significant indicator for scientific production is the number of scientific articles that are indexed in certificated databases. Evaluation of the scientific production has become so significant as an important aspect of research and scientific production, in the way that today production and consumption of information in different communities is one of the growth and development indicators. The aim of this article is to investigate 10-years of scientific production of Iranian dentistry community in the ISI .
Materials and Methods : In this article ten years of scientific production in dentistry in ISI database was investigated using bibliometric method. Therefore, our search was limited to Iran and dentistry during 2000-2009, and the retrieved items were analyzed .
Results : It was shown that a total of 383 documents have been produced and published in this time period, among which 350 (91.4%) was authored by dental professionals in 10 Iranian universities. In this regard, Tehran University of medical sciences researchers have authored 30/8% of all productions. The most international cooperation of the Iranian dentistry researchers has been with the researchers of USA with 28 articles followed by Australia, England and Finland. Concerning journals publishing the research of the Iranian dental community, the Journal of Endodontics, has published 34 documents of all productions in this realm .
Conclusion : Our search showed that the scientific productivity of Iranian dentists has been ascending in these years. The growth reached the top in 2009, and became doubled compared with the previous year and ten times more than those in 2000 .
Scientific Production , Dentistry , ISI web Science
http://jida.ir/article-1-1290-en.html
http://jida.ir/article-1-1290-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Awareness, Knowledge and Attitude of Dental Students of Tehran and ShahidBeheshti Universities of Medical Sciences about Evidence-based Dentistry
197
203
EN
Mohammad reza
Khami
Assistant Professor, Department of Community Oral Health, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran
N
Ahmad
Jafari
Assistant Professor, Department of Community Oral Health, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran
N
Zahra
Mohtashamrad
Dentist
Z_sh_64@yahoo.com
Y
Reza
Yazdani
Assistant Professor, Department of Community Oral Health, School of Dentistry, Tehran University of Medical Sciences. Tehran, Iran
N
Anahita
Moscowchi
Dentist
N
Ensiyeh
Akhgari
Dentist
N
Maryam
Elyasi
Dentist
N
Background and Aim : Evidence-based dentistry is an approach to oral health that requires a reasonable combination of scientific evidence with the dentists’ diagnostic and clinical practice as well as patients’ needs and treatment priorities. The aim of this study was evaluation of awareness, attitudes and self- assessed knowledge of dentistry students about EBD in governmental universities in Tehran.
Materials and Methods : Subjects included junior students of dentistry studying in Tehran and Shahid Beheshti Universities of Medical Sciences. Sixty-five subjects were evaluated, among which 85% answered the questionnaire. Questionnaires were distributed to the students before and after their courses to evaluate student’s awareness, attitude and self- assessment knowledge. Chi- square and T- test were used to analyze the results.
Results : Totally 80% of students had a fair or poor awareness about EBD. Almost, all the students had a correct attitude about EBD and 80% had a correct attitude about the steps. The mean male student’s knowledge was significantly higher than that of female counterparts. Also, there was a significantly positive correlation between student’s knowledge score and self- assessed knowledge about EBD .
Conclusion : Despite good attitudes about EBD, there is a deficiency in student’s knowledge, so an appropriate plan is suggested to resolve this problem .
Dentistry Students , Evidence-Based Dentistry
http://jida.ir/article-1-1283-en.html
http://jida.ir/article-1-1283-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
24
4
2012
10
1
Coronal Discoloration Potential after Using Two Root Canal Dressings (Calcium-Hydroxide vs.Triantibiotic Dressing)
204
208
EN
Maryam
Zare Jahromi
Zare Jahromi
hiva1378maryam@yahoo.com
Y
Masoud
Barati
Barati
N
Jouya
Barati
Barati
N
Background and Aim : Tooth discoloration of anterior teeth is an important esthetic problem for both the patient and dentist. One of the causative factors in this regard is placing intracanal medicaments. The aim of this study was to compare discoloration potential of calcium hydroxide vs. triantibiotic paste when being placed into the pulp chamber space .
Materials and Methods : Forty extracted upper human central incisors, with no caries or crack were selected for this study. Digital photographs were taken from the buccal aspect of all specimens under a standard situation. RGB/HSB variables were recorded, using Photoshop software,. Then access cavities were prepared and canals enlarged using #1, #2, and #3 gates glidden drills and peeso reamers. The teeth were randomly divided into two experimental groups. In group A calcium hydroxide and in group B triantibiotic compound was placed in pulp chamber space. Then access cavities were sealed with a self-curing glass ionomer cement. After incubation of the samples for four months digital photographs were taken in the same standard situation and RGB/HSB variables were recorded. Pre- and post-treatment data were compared and analyzed using paired-t and independent t-tests .
Results : Both experimental groups showed a significant discoloration after four months in their labial surfaces. (p<0.05) Discoloration changes in calcium hydroxide group was much more than that of triantibiotic group but the difference was not significant (p>0.05 ).
Conclusion : Tooth discoloration was indicated following use of both calcium hydroxide and triantibiotic dressing within the pulp chamber space, but the difference between two groups was not statistically significant.(p>0.05 ).
Discoloration , Calcium hydroxide , Triantibiotic paste
http://jida.ir/article-1-1284-en.html
http://jida.ir/article-1-1284-en.pdf