Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Final Retention of Recemented Dental Casting Luted
with Different Resin Cements
1
7
EN
Ehsan
Ghasemi
Assistant Professor, Dental Materials Research Center and Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran
N
0000-0001-7415-4414
Navid
Haghayegh
Private Dentist, Specialist of Restorative Dentistry, Ontario, Canada
N
Fatemeh
Salehi Ghalesefid
Postgraduate Student, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfa-han, Iran
Salehifa.1991@gmail.com
Y
0000-0003-3935-2604
10.30699/jidai.32.1.2.1
Background and Aim: Dislodgment of prosthetic crowns is a common occurrence. In such cases, recementation is a suitable treatment option. The aim of this study was to compare the retention in cementation and recementation using different resin ce-ments.
Materials and Methods: In this in vitro, experimental study, 40 premolars were se-lected (n=10). They were standardized relative to some properties and then the wax patterns were prepared and cast. After 24 h, all specimens were decemented using In-stron universal testing machine. The castings were then re-cemented and stored under the same conditions. After 24 h, the cemented copings were dislodged, and the separa-tion load was recorded.
Results: The highest and the lowest mean retention values belonged to Panavia F2 and Maxcem cements in both initial cementation and recementation groups, respectively. Paired sample t-test showed a significant difference in the retention of G-CEM group between initial cementation and recementation (P=0.009). The two-factorial repeated measures ANOVA showed the significant effect of cement type on retention (P=0.009), and there was a significant difference in retention between initial cementation and recementation (P=0.006). The Tukey’s HSD test re-vealed a significant difference in retentive strength between the Maxcem and Panavia F2 (P=0.011). The lowest mean difference was observed between Bifix SE and Maxcem groups (-16.75 kgf, P=0.89).
Conclusion: The maximum and minimum mean retention values belonged to Panavia F2 cement and Maxcem in both initial cementation and recementation groups, respectively. There was a significant difference between the initial cementation and recementation in G-CEM group.
Cementation, Dental Cements, Resin cements, Dental Prosthesis
Retention, Tensile Strength
http://jida.ir/article-1-2092-en.html
http://jida.ir/article-1-2092-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Microshear Bond Strength of Glass Ionomer to Primary Dentin following Surface Treatment by Bur and Er,Cr:YSGG Laser
8
11
EN
Yasaman
Rezvani
Assistant Professor, Department of Pediatric Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
N
0000-0002-1940-6436
Majid
Bargrizan
Professor, Department of Pediatric Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
N
Mohammad
Asnaashari
Professor, Department of Endodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
moham-mad.asna0@gmail.com
Y
0000-0001-8682-6249
Marzieh
Gholami
Dentist, Private Practice, Isfahan, Iran
N
Amir
Ghasemi
Professor, Department of Operative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
N
0000-0002-5836-2149
Leila
Eftekhar
Assistant Professor, Department of Pediatric Dentistry, Dental School, Zanjan University of Medical Sciences, Zanjan, Iran
N
0000-0001-6285-1511
10.30699/jidai.32.1.2.8
Background and Aim: Er,Cr:YSGG laser irradiation has been suggested as an effective method of cavity preparation and surface treatment to enhance the bond strength. The aim of this study was to assess the microshear bond strength of Fuji II LC glass ionomer (GI) cement to primary dentin following bur preparation and Er,Cr:YSGG irradiation.
Materials and Methods: This in vitro, experimental study was conducted on 20 extracted primary canine teeth. After debris removal, the teeth were sectioned buccolingually and divided into two groups. In group 1, the exposed dentin surface was prepared by fissure bur; while in group 2, the dentin surface was subjected to Er,Cr:YSGG laser irradiation with 2 W power and 80% air and 50% water. Fuji II LC GI cement was applied. After 24 h of storage, the samples were subjected to microshear bond strength test in a microtensile tester. The bond strength values in the two groups were compared using Student t-test.
Results: The mean (± standard deviation) microshear bond strength of GI to dentin was 15.36±2.98 MPa in the laser and 4.86±1.36 MPa in the bur group. The mean mi-croshear bond strength in the laser group was significantly higher than that in the bur group (P<0.0001).
Conclusion: Irradiation of Er,Cr:YSGG laser with 2 W power increases the microshear bond strength of Fuji II LC GI to primary dentin, and is superior to bur preparation for this purpose.
Dentin, Glass Ionomer Cements, Lasers, Tooth, Deciduous, Shear Strength, Tooth Prep-aration
http://jida.ir/article-1-2093-en.html
http://jida.ir/article-1-2093-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Shear Bond Strength of Porcelain Veneering to
Nickel-Chromium, Chromium-Cobalt, Zirconia and Lithium
Disilicate
12
20
EN
Davood
Bahri
MSc Biomaterial Student, Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
N
Sayed Khatiboleslam
Sadrnezhaad
Professor, Department of Materials science and Engineering, Sharif University of Technology, Tehran, Iran
N
Sara
Koosha
Assistant Professor, Prosthodontics Department, Member of Implant Research Center, Dental Branch of Tehran, Islamic Azad University, Tehran, Iran
koosha_sa2003@yahoo.com
Y
Najmeh
Najmoddin
Assistant Professor, Department of Biomedical Engineering, Science and Research Branch, Islamic Azad University, Tehran, Iran
N
10.30699/jidai.32.1.2.12
Background and Aim: High chipping rates of the veneering porcelain in zirconia ce-ramic restorations have been reported in many clinical studies. However, information on the bonding behavior of veneering porcelain to zirconia and lithium disilicate frameworks is limited. The purpose of this study was to evaluate the bond-ing strength of porcelain veneering to zirconia, lithium disilicate, nickel-chromium (Ni-Cr) and cobalt-chromium (Co-Cr) alloys.
Materials and Methods: In this in vitro experimental study, core specimens were fabricated with 12 mm height and 11 mm diameter, and veneering specimens were fabricated with 7 mm height and 5 mm diameter according to the manufacturer’s in-structions in four groups (n=12) as follows: Group I: Ni-Cr alloy, group II: Co-Cr alloy, group III: lithium disilicate, and group IV: zirconia. The shear bond strength (SBS) test was performed in all samples with a universal testing machine with a crosshead speed of 0.5 mm/min. The fractured samples were examined under a stereomicroscope (×10) to determine the mode of failure. The results were analyzed by one-way ANOVA (P<0.05).
Results: Maximum SBS was recorded in group IV (zirconia; 34.6 MPa) followed by groups II (Co-Cr; 30.66 MPa), I (Ni-Cr; 30.58 MPa), and III (lithium disilicate; 20.05 MPa). One-way ANOVA revealed no significant difference between the study groups (P=0.174).
Conclusion: The SBS of porcelain veneering to zirconia, lithium disilicate, Ni-Cr, and Co-Cr alloys was not significantly different.
Dental Porcelain, Dental Bonding, Zirconium Oxide, Shear Strength
http://jida.ir/article-1-2098-en.html
http://jida.ir/article-1-2098-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Effect of Er:YAG Laser Irradiation on Shear Bond Strength of Two Porcelain Laminate Veneers Bonded to Tooth Surface
21
29
EN
Ehsan
Morshedi
Postgraduate Student, Faculty of Dentistry, Shahed University, Tehran, Iran
N
0000-0003-2763-8138
Maryam
Azimi Zavaree
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
N
Seyed Mohammad Reza
Hakimaneh
Assistant Professor, Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
N
0000-0003-3306-357X
Sayed Shojaedin
Shayegh
Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Shahed University, Tehran, Iran
N
0000-0003-3513-5848
Maryam
Pirmoradian
PhD. Candidate, Department of Dental Biomaterials, School of Dentistry, Research Center for Science and Technology in Medicine, Tehran University of Medical Sciences, Tehran, Iran
N
Sara
Torabi
Periodontist, Tehran, Iran
N
Sina
Jafari
Postgraduate Student, Faculty of Dentistry, Shahed University, Tehran, Iran
sina_jafari89@yahoo.com
Y
0000-0001-9268-1146
10.30699/jidai.32.1.2.21
Background and Aim: The conventional procedure for removal of porcelain laminate veneers (PLVs) is time-consuming and inconvenient. The purpose of this study was to evaluate the efficacy of Er:YAG laser for debonding of PLVs.
Materials and Methods: Forty-eight intact extracted human maxillary anterior teeth received discoid PLVs (24 feldspathic and 24 e-max ceramic). The PLVs had 0.7 mm thickness and 4 mm diameter. After cementation of all PLVs with a light-cure cement, samples were stored at 37ºC distilled water for 48 h. Samples of each ceramic were randomly divided into 3 groups of 8 samples. Then, laser was irra-diated on the cemented PLVs as follows: (I) feldspathic PLVs without laser irradiation (control group), (II) feldspathic PLVs with laser irradiation (6 s, 10 Hz, 200 mJ, 2 W), (III) feldspathic PLVs with laser irradiation (6 s, 10 Hz, 300 mJ, 3 W), (IV) e-max PLVs without laser irradiation (control group), (V) e-max PLVs with laser radiation (6 s, 10 Hz, 200 mJ, 2 W), (VI) e-max PLVs with laser irradiation (6 s, 10 Hz, 300 mJ, 3 W). The shear bond strength of all samples was measured using a universal testing machine. We used Mann-Whitney and Kruskal-Wallis tests for data analysis (P<0.05).
Results: Laser irradiation decreased the shear bond strength of both ceramics. But this decrease was only significant for the e-max group (P<0.05). No significant difference was found between different laser irradiation powers in the two ceramic groups.
Conclusion: Er: YAG laser is effective for debonding of e-max PLVs.
Dental Porcelain, Dental Veneers, Lasers, Solid-State, Resin Cements
http://jida.ir/article-1-2100-en.html
http://jida.ir/article-1-2100-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Comparison of Salivary Peroxidase in HIV Positive Patients and Healthy Controls: A Case-Control Study
30
36
EN
Fatemeh
Ahmadi-Motamayel
Associate professor, Dental Implant Research Center and Dental Research Center, Department of Oral Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
N
Samaneh
VaziriāAmjad
Assistant professor, Department of Oral Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
samanehdent83@yahoo.com
Y
0000-0003-2220-9975
Poorandokht
Davoodi
Assistant Professor, Department of Oral Medicine, Dental School, Hamadan University of Medical Sciences, Hamadan, Iran
N
Mohammad Taghi
Goodarzi
Professor, Research Center for Molecular Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
N
Jalal
Poorolajal
Associate Professor, Research Center for Health Sciences and Department of Epidemiology & Biostatistics, School of Public Health, Hamadan University of Medical Sciences, Hamadan, Iran
N
Hamidreza
Abdolsamadi
Full Professor, Dental Implant Research Center and Dental Research Center, Department of Oral Medicine, Hamadan University of Medical Sciences, Hamadan, Iran
N
10.30699/jidai.32.1.2.30
Background and Aim: Saliva, as an easy diagnostic tool, has various defense mecha-nisms such as immunological, enzymatic and antioxidant defense systems. Salivary peroxidase is one of the most important salivary antioxidants. Human immunodeficiency virus (HIV) positive and acquired immunodeficiency syndrome (AIDS) patients have decreased antioxidant and increased oxidative stress levels. Therefore, the aim of this study was to compare the level of salivary peroxidase in HIV positive patients and healthy controls.
Materials and Methods: In this case-control study, 49 HIV positive patients and 49 healthy controls were selected as the case and control group, respectively. Demographic, clinical, and paraclinical information was recorded in a checklist. Next, 5 mL of unstimulated whole saliva was collected during 5 min in sterile Falcon tubes. Peroxidase activity of the saliva was measured by the Gelycol method. Data were ana-lyzed by SPSS 11 via t-test and Chi-square test.
Results: The salivary peroxidase level was slightly higher in the case group in comparison with the healthy control group, but this difference was not statistically significant (P=0.157). Dental status of the case group was significantly different from the control group (P=0.029). The mean age of the case group was also significantly higher than the control group (P=0.005). In the case group, females had a higher frequency than males.
Conclusion: The results showed slightly, but not significantly, higher level of peroxidase in the study group than the healthy controls. Minimal change in salivary peroxidase in HIV positive patients may be related to the early stage of their disease and good function of the immune system.
Saliva, Peroxidases, HIV, Antioxidants
http://jida.ir/article-1-2101-en.html
http://jida.ir/article-1-2101-en.pdf
Journal of Iranian Dental Association
Journal of Iranian Dental Association
2383-3041
32
1
2020
1
1
Comparison of Two Standard Scales for Pain Perception during Local Anesthetic Injection in Children
37
42
EN
Farzaneh
Jalali
Resident, Department of Pediatric Dentistry, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
N
0000-0002-4868-1285
Saeedeh
Shojaeepour
Assistant Professor, PhD of Pharmacology, Pathology and Stem Cell Research Center, Kerman University of Medical Sciences, Kerman, Iran
N
0000-0003-1327-1400
Raziyeh
Shojaiepour
Assistant Professor, Department of Pediatric Dentistry, Oral and Dental Diseases Research Center, School of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
sinadina3@gmail.com
Y
10.30699/jidai.32.1.2.37
Background and Aim: Local anesthetic injection is among the most anxiety-provoking procedures in children. Some scales are currently available to quantify the level of pain experienced based on the child’s behavior. The purpose of this study was to compare two commonly used pain scales.
Materials and Methods: This split-mouth study was conducted on 49 healthy children aged 3.5 to 9 years who needed dental treatment of bilateral primary molars under local anesthesia. The patients were randomly assigned to two groups. The level of anxiety was recorded at baseline and during local anesthetic injection ac-cording to the face-legs-activity-cry-consolability (FLACC) and the sound-eyes-motor (SEM) scales in the two groups. Then, the level of pain experienced by the child was determined according to the visual analog scale (VAS). Data were analyzed by SPSS version 20 using Mann-Whitney and Wilcoxon tests at 0.05 level of significance. Results: There was no statistically significant difference in pain score based on VAS after local anesthetic injection in the first and second sessions between the SEM (P=0.877) and FLACC (P=1.00) groups.
Results: This study showed that there was no difference between the SEM and FLACC scales regarding pain perception during local anesthetic injection in children, and some parameters of the two scales that were measured in the children’s face area were behaviors that the children exhibited during local anesthetic injection.
Conclusion: This study showed that there was no difference between the SEM and FLACC scales regarding pain perception during local anesthetic injection in children, and some parameters of the two scales that were measured in the children’s face area were behaviors that the children exhibited during local anesthetic injection.
Pediatric Dentistry, Visual Analog Scale, Pain, Child Behavior
http://jida.ir/article-1-2102-en.html
http://jida.ir/article-1-2102-en.pdf