2024-03-28T23:22:22+03:30 http://jida.ir/browse.php?mag_id=96&slc_lang=en&sid=1
96-1726 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Microshear Bond Strength of Transbond XT and Assure Universal Bonding Resin to Stainless Steel Brackets, Amalgam and Porcelain Gholamreza Eslami Amirabadi Maryam Shirazi Dr.maryam_shirazi@yahoo.com Zahra Shirazi Background and Aim: Assure Universal Bonding Resin is marketed with fluoride releas-ing potential. The manufacturer claims that it provides adequate bond strength between the bracket and amalgam and porcelain. This study compared the shear bond strength of Transbond XT and Assure Universal Bonding Resin to stainless steel brackets, amalgam and porcelain in vitro. Materials and Methods: In this in vitro study, 20 standard brackets of the maxillary cen-tral incisors, 20 feldspathic porcelain specimens and 20 self-cure acrylic cavities filled with amalgam were divided into 2 groups bonded with Transbond XT and Assure. After surface preparation in each group, Transbond XT composite was applied to the surfaces using silicon tubes and light-cured for 20 seconds. Then, the microshear bond strength was measured using a universal testing machine. The data were subjected to two-way ANOVA, Tukey’s post hoc test, Student’s t-test and the Kruskal Wallis test. Results: Different microshear bond strength values were obtained for the bond to stain-less steel brackets, amalgam and porcelain by Transbond XT and Assure (p<0.000). Using Assure for bonding to amalgam (7.2±1.46 vs. 10.12±4.97) and brackets (16.14±3.2 vs. 20.16±5.12 p<0.05) decreased the microshear bond strength compared to Transbond XT. However, Assure significantly increased the bond strength to porcelain compared to Transbond XT (28.84±6.42 vs. 22.48±3.6 p<0.01). Non-parametric Kruskal-Wallis test showed significant differences in adhesive remnant index (ARI) between the two bonding agents only in the amalgam group (p=0.029). Conclusion: Although the bond strength values of Assure were less than those of Transbond XT, Assure was capable of providing sufficient bond strength especially to porcelain. Bond strength Orthodontic adhesive Dental amalgam Dental porcelain Stainless steel 2015 1 01 1 5 http://jida.ir/article-1-1726-en.pdf
96-1727 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Retracted: Stress Distribution in Three-Implant- Retained Mandibular Overdentures Using Finite Element Analysis Asadollah Ahmadzadeh Farnoosh Golmohammadi farnoosh.gol@gmail.com Najmeh Mousavi Saeid Epakchi Background and Aim: Demand for implant-supported overdentures has increased due to the problems of conventional dentures. Despite the high success rate of implants, implant failure remains a major challenge. Implant overload can cause cortical bone loss and im-plant failure. Using finite element analysis (FEA), this study aimed to find the best design and type of attachments causing minimum stress in the alveolar bone. Materials and Methods: The geometrical model of the mandible was produced using computed tomography (CT) data and three ITI implants were placed in the midline and the location of the first premolar teeth. All conditions were simulated using finite element software. Three bar-ball, bar and ball attachments were considered to support the overdenture. Maximum von Mises stress was calculated in the supporting bone in differ-ent overdenture designs. Results: The greatest amount of stress in bone was around the upper thread and the neck of the implant. The ball and the bar-ball attachments applied the most and the least amount of stress to the peri-implant bone, respectively. Maximum stress was applied to the ball attachment in the bar-ball design. The maximum amount of movement was in bar-ball attachment. Conclusion: The bar-design decreased the stability of overdenture, as well as the stress in the peri-implant bone. Ball design increased concentration of stress in bone around the implant and increased the stability of overdenture. Dental implant Mandibular overdenture Attachment systems Finite 2015 1 01 6 14 http://jida.ir/article-1-1727-en.pdf
96-1728 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 In Vitro Antifungal Efficacy of Different Intracanal Irrigants against Candida Albicans Mansoreh Abbasi Anahita Norouzifard anahita_norouzifard@yahoo.com Masoud Sharifi Background and Aim: An intracanal irrigant is essential for a successful root canal ther-apy. The aim of this study was to compare the antifungal efficacy of 5.25% sodium hypochlorite, 2% chlorhexidine gluconate (CHX) and 94% carvacrol against Candida albicans (C. albicans) in vitro. Materials and Methods: In this experimental study, after crown removal and canal prep-aration of 48 extracted human maxillary central incisors, they were randomly divided into 3 experimental groups of 14 teeth, plus two groups of positive and negative controls (n=3). A suspension of C. albicans (ATCC=10261) was injected into the experimental and positive control group root canals. The teeth were then incubated for 72 hours. Then, root canals in each group were rinsed with one of the irrigants for 1 minute and samples were taken from the canals and inoculated on plates. After 48 hours of incubation, the colony growth was assessed and colony forming units (CFUs) served as a measure of antifungal activity. Data were analyzed using the Kruskal Wallis test. Results: In carvacrol, sodium hypochlorite and CHX groups, 6, 10 and 1 specimen did not show bacterial growth and the mean CFU was 86.3, 53.3 and 271.2 in the mentioned groups, respectively. Conclusion: Carvacrol and 5.25% sodium hypochlorite had similar antifungal efficacy against C. albicans and this effect was significantly greater than that of 2% CHX. Candida albicans Carvacrol Chlorhexidine gluconate Root canal Sodium hypochlorite 2015 1 01 15 18 http://jida.ir/article-1-1728-en.pdf
96-1729 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Age Estimation from Pulp/Tooth Area Ratio Using Digital Panoramic Radiography Shirin Sakhdari sh_sakhdari@dentaliau.ac.ir Sandra Mehralizadeh sh_sakhdari@dentaliau.ac.ir Maryam Zolfaghari Majid Madadi Background and Aim: To estimate the age in forensic identification, when none of the other identification methods are feasible, the teeth are used. The aim of the present study was to estimate the age from pulp/tooth area ratio (AR) by digital panoramic radiography in patients referred to a radiology clinic. Materials and Methods: In this diagnostic study, digital panoramic radiographs of 120 cases were assessed. The chronological age was calculated by subtracting the date of birth from the date of radiographs and the AR was calculated with "AutoCAD" software. Using the regression model, the age was estimated. In this study, the role of sex was also assessed. Results: The mean difference between the chronological and the estimated age was 0.11 years in male group. The correlation coefficient was -0.180 and the correlation between age and AR was not statistically significant (p= 0.169). The mean difference between the chronological and estimated age was 0.36 years in female group. Correlation coefficient was -0.336 and the correlation between age AR was significant (p= 0.004). Negative cor-relation indicates that AR decreases by aging. Conclusion: According to the results, AR cannot be used for age estimation alone but it can be used in combination with other indices for this purpose. Digital panoramic radiography Age estimation AutoCAD 2015 1 01 19 23 http://jida.ir/article-1-1729-en.pdf
96-1730 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Reliability and Validity of the Persian Version of Dental Student Learning Education Questionnaire and a Researcher Made Questionnaire about In-terest of Dental Students in Their Field of Study Faramarz Mojtahedzadeh Esmaeil Yassini Nafiseh Rahmani nafiseh_rah91@yahoo.com Background and Aim: Improving the quality of dental education significantly enhances the quality of services and promotes public health. The purpose of this study was to assess the reliability and validity of the Persian version of dental student learning education questionnaire (DSLES) and a researcher made questionnaire about interest of dental students in their field of study. Materials and Methods: A questionnaire composed of two major components was de-signed in this study. The first part, was a researcher made questionnaire related to stu-dents’ interest in their field of study and the second part was the Persian translation of the DSLES. Delphi approach was used for content validation. Cronbach’s Alpha and the Kappa coefficients were determined by SPSS for assessing reliability. Results: All indicators of content validity (except for 6 items in the second part) and the inter-rater agreement were higher than %75. The Cronbach’s alpha for all subscales was higher than %75 and the Kappa for all items was higher than %73. According to the re-sults of 375 questionnaires, Cronbach’s alpha for the first part was 79%, for the second part was 85% and for the entire questionnaire was 86%. Conclusion: The designed questionnaire can serve as an acceptable instrument in the Ira-nian educational settings. Interest Dental students Educational environment Validity Reliability 2015 1 01 24 30 http://jida.ir/article-1-1730-en.pdf
96-1731 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Reliability of Fine Needle Aspiration Cytology for Salivary Gland Lesions Gita Rezvani Farzad Yazdani Bioki Roya Khatami Royakhatami74@yahoo.com Hamed Keramat Ali Moadabi Background and Aim: Fine needle aspiration (FNA) cytology is a safe, reliable, mini-mally invasive and cost-effective technique for the diagnosis of salivary gland lesions. This study aimed to assess the accuracy, reliability and diagnostic value of FNA cytology in Iran. Materials and Methods: A total of 200 records of patients with a history of biopsy or surgical excision of salivary gland lesions along with their histological and cytological examination results were retrieved and evaluated in the Pathology Department of Amir Alam Hospital during 2007-2013. The results of cytological diagnosis were divided into 4 groups of unfavorable, benign, suspicious and malignant. The cytological results were compared with the histological data. The accuracy, sensitivity, specificity, positive predic-tive value (PPV) and negative predictive value (NPV) of FNA cytology were calculated using SPSS version 16.00. Results: Of the specimens chosen for the study, 173 were from the parotid, 22 from the submandibular and 5 from the minor salivary glands. FNA cytological diagnosis was be-nign in 161 cases, suspicious for malignancy in 4 cases, and malignancy in 35 cases. Of 161 cases diagnosed as benign by FNA cytology, 25 were malignant and the frequency of false positive results was 15.5%. The accuracy, sensitivity, specificity, PPV and NPV of the FNA test were 82, 53, 93, 72 and 84%, respectively. Conclusion: A good agreement exists between the FNA results and final histopathological diagnosis of salivary gland tumors. Also, this study showed that FNA cytology has mod-erate accuracy and relative diagnostic value for diagnosis of salivary gland lesions. Salivary gland Fine needle aspiration biopsy Sensitivity Specificity Diagnostic accuracy 2015 1 01 31 37 http://jida.ir/article-1-1731-en.pdf
96-1732 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Effect of Different Decontamination Procedures for Saliva-Contaminated Uncured Bonding Agent on Shear Bond Strength of Composite to Enamel Hossein Afshar Shahram Mosharrafiyan Samaneh Abbasi Salimkandi abbasi.samane@gmail.com Background and Aim: Prevention of contamination during the procedural steps is a req-uisite for achieving a satisfactory composite restoration. The aim of this experimental study was to assess the shear bond strength of composite to enamel following two differ-ent decontamination procedures of saliva-contaminated uncured bonding agent in comparison with uncontaminated condition. Materials and Methods: Thirty-six extracted sound human premolars and incisors were selected. Enamel of the buccal surface was ground flat. The teeth were divided into 3 groups of 12 each. In the control group (1), 3M Single Bond adhesive was used according to the manufacturer’s instructions, without any contamination. In groups 2 and 3 un-cured adhesive was saliva contaminated and then: (group 2) rinsed, dried, etched (5 seconds), rinsed, dried and adhesive was reapplied and (group 3) cured, dried, etched (5 seconds), rinsed, dried and adhesive was reapplied. Then composite cylinders were bonded to the enamel surfaces. Finally, samples were sheared using Instron testing machine and shear bond strength data were subjected to one-way ANOVA. Results: The mean bond strength was 16.5317 MPa in the control group, 16.2308 MPa in rinsed contaminated bonding group and 15.8025 MPa in cured contaminated bonding group. No statistically significant difference was found in the mean shear bond strength of groups 1,2 and 3 (p=0.954). Conclusion: Both decontamination protocols (groups 2 and 3) resulted in acceptable bond strength and both were comparable with uncontaminated condition. Saliva contamination Enamel Shear bond strength Bonding agent 2015 1 01 38 42 http://jida.ir/article-1-1732-en.pdf
96-1733 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Comparative Effect of Casein Phosphopeptide Amorphous Calcium Phosphate and Resin Infiltrant on Brown Spot Color Parameters after Using 20% Carbamide Peroxide Farzaneh Shirani Hale Khalili Marjan Mehravaran Marjan_mehr68@yahoo.com Background and Aim: Tooth-colored restorations are the current strategy for treatment of aesthetically unpleasant brown spots (BSs). Considering the importance of conserva-tive dentistry, this study aimed to assess the effect of resin infiltrant (RI) and casein phosphopeptide amorphous calcium phosphate (CPP-ACP) after the application of 20% carbamide peroxide (CP) on BS color parameters in the esthetic zone. Materials and Methods: This experimental study was conducted on 70 extracted sound human teeth with BSs. The specimens were first subjected to the application of 20% CP and were then randomly divided into two groups of CPP-ACP and RI. Specimens were subjected to colorimetry before the intervention, after bleaching and after the application of RI or CPP-ACP using a spectrophotometer. Data were statistically analyzed using SPSS version 20, paired t-test, independent t-test and repeated measures ANOVA with P<0.05 level of significance. Results: CP (20%) significantly increased the L* and b* and decreased the a* parameter (p<0.001). CPP-ACP caused no change in a* and b* parameters of BS (p>0.05) howev-er, the L* significantly increased (p<0.001). RI significantly decreased the a* parameter (p<0.001) but the reduction in L* and increase in b* were not significant (p>0.05). Com-parison of the two groups revealed that only the color change (ΔE) during the bleaching procedure was significant (p<0.001). ΔE of BS and the adjacent enamel did not change significantly in any step of the procedure in the two groups (p>0.05). Conclusion: Based on the results, aesthetically unpleasant BSs on teeth may be treated using a bleaching agent along with RI or CPP-ACP. RI seems to have a superior efficacy in increasing the translucency compared to CPP-ACP. Spectrophotometry Tooth discoloration Esthetics Dental Carbamide peroxide Casein phosphopeptide amorphous calcium phosphate 2015 1 01 43 52 http://jida.ir/article-1-1733-en.pdf
96-1734 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Contamination of Dental Scaler Waterlines with Legionella Pneumophila, Pseudomonas Aeruginosa and Gram Positive Cocci Parichehr Ghalyani Majid Karami Asghar Havaei Aliasghar Naderi Milad Alikhani alikhanimilad.oralmedicine@yahoo.com Background and Aim: Dental staff are exposed to aerosols. Water supply of dental units has insignificant bacterial count but the exiting water in the waterlines has over 100,000 microorganisms per milliliter. Various types of microorganisms exist in the waterline of dental units. Legionella pneumophila (L. pneumophila), Pseudomonas aeruginosa (P. aeruginosa) and Gram-positive cocci are among the most important ones. Scaling and root planning is a dental procedure carrying a high risk of bacterial contamination. This study aimed to assess water contamination in private dental offices in Isfahan city. Materials and Methods: In this descriptive study, water sampling was done in 50 private offices 10 mL samples of dental unit water were collected from each scaler and a sample from the city tap water as control. We used 3-step polymerase chain reaction (PCR) for detection of L. pneumophila. The extracted DNA was evaluated for presence of mip gene sequence using spectrophotometry. For detection of P. aeruginosa, samples were cultured in Brilliant Green Bile broth. To confirm P. aeruginosa, the grown colonies were cultured in Cetrimide agar medium and presence of P. aeruginosa was re-confirmed with oxidase test. For evaluation of Gram-positive cocci, multiple smears were prepared and after Gram staining, Gram-positive specimens were cultured in blood agar medium. Data were analyzed using SPSS version 20 and reported in tables and diagrams as number and percentage. Results: None of the control samples were positive for any bacterium. Thirty-two test samples were also negative for the understudy bacteria but 18 offices tested positive for these bacteria. Conclusion: Our results shows that hazardous bacteria may be present in dental unit bio-film. Special attention must be paid to the cleanliness of water used in dental procedures. Legionella pneumophila Pseudomonas aeruginosa Gram-positive cocci 2015 1 01 53 57 http://jida.ir/article-1-1734-en.pdf
96-1735 2024-03-28 10.1002
Journal of Iranian Dental Association J Iran Dent Assoc 2383-3041 10.52547/jida 2015 27 1 Comparison of Shear Bond Strength of Three Generations of Resin Bonding Agents and Glass Ionomer to Dentin Mohammad Atefat Mostafa Sadeghi mostafa.sadegh@rumsi.ac.ir Background and Aim: Due to specific properties of dentin, such as tubular structure and intrinsic moisture, bond to dentin is more difficult than to enamel. The purpose of this study was to compare the shear bond strength (SBS) of composite resin to dentin using three different types of resin bonding agents and a glass ionomer-based adhesive. Materials and Methods: In this in vitro study, 72 premolar teeth without caries or resto-rations were selected and randomly divided into six groups of 12. The first group (I) was chosen as the control group and received no preparation of dentin surface. The remaining groups received application of Single Bond (group II), OptiBond XTR (group III), All-in-One (group IV) and GC Fuji Bond LC adhesive as pre-cure (group V) and co-cure (group VI) on dentin surface, respectively. The samples were stored for two weeks in water at room temperature and then their SBS was measured using Zwick universal testing ma-chine with a crosshead speed of 1mm/min. Statistical data were analyzed using One-way ANOVA and Tamhane's T2 test. Results: The group bonded with OptiBond XTR had the maximum SBS (24.05±9.43 MPa) while the control group showed minimum SBS (0.68±0.32 MPa). SBS of composite resin to dentin in groups V and VI bonded with GC Fuji Bond LC adhesive was signifi-cantly lower than that in groups bonded with resin bonding agents (P<0.05). Conclusion: Based on the results, application of GC Fuji Bond LC glass ionomer adhe-sive is not recommended to bond composite to dentin. Dentin bonding agent Fuji bond LC Glass ionomer Composite resin 2015 1 01 58 63 http://jida.ir/article-1-1735-en.pdf