دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Comparative evaluation of root canal configuration in the mandibular left and right second premolars: a CBCT study in an Iranian population
1
6
FA
A
Valian
V
Akhavan Zanjani
E
Moravejsalehi
M
Ekrami
ABSTRACT
Background and Aim: Mandibular second premolars show a great diversity in root canal configuration. The aim of this study was to assess the root canal morphology in the mandibular left and right second premolars using CBCT imaging technique.
Materials and Methods: In this descriptive study, 457 CBCT images including human mandibular left and right second premolars were evaluated. CBCT scans were assessed in three orthogonal planes and the differences in the number of roots and root canals were recorded. Data were analyzed by Chi-Square test. The significance level was set at p< 0.04.
Results: From 457 mandibular left and right second premolars, on the left side 94.3% of the teeth had one root and 5.7% had two roots. On the right side, 95.6% of the teeth had one root and 4.4% had two roots. On the left side, 77.9% of the teeth had a single canal and 22.1% had two canals and on the right side 83.4% of the teeth had a single canal and 16.6% had two canals. There was a significant difference in the number of root canals between mandibular left and right second premolars (p=0.036) but no significant difference existed regarding the number of roots (p=0.364).
Conclusions: It seems that the root canal configuration differs between the mandibular left and right second premolars in the studied Iranian population.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
The effect of acupressure on the gag reflex
7
10
FA
N
Rahshenas
SH
Nasermostofi
N
Valaii
A
Farajzad
Background & Aim: Gag reflex occurs during some diagnostic examinations and dental treatments. The present study aimed to evaluate the effect of acupressure on the patients with gag reflex during clinical examinations with tongue blade.
Materials & Methods: this clinical trial was performed on patients with gag reflex during oral examinations with tongue blade. The reflex level was assessed by standard vigesimal Glasgow Scale. The patients were divided to three groups of control (without palpation), case group 1 (with palpation of the palm pressure point) and case group 2 (with palpation and pressing the above mentioned body part). The changes in the level of gag reflex were analyzed by Kruskal - Wallis Test.
Results: 75 individuals were evaluated. The level of changes in gag reflex in the control group was 0.71±0.43 and this level equaled 1.69±0.88 in the case group 1 and 3.9±1.9 in the case group 2. (p<0.01)
Conclusion: according to the results of this study, it seems that traditional medicine of press palpation decreases gag reflex.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Clinical comparison of anti-plaque efficacy between Iranian and Spanish mouthwashes containing 0.12% Chlorhexidine and 0.05% Sodium Fluoride
11
15
FA
V
Esfahanian
SHZ
Farhad
S
Nasirian
J
Memarian
Background and aim: Chlorhexidine is the most effective substance for chemical removal of dental plaque and is recognized as a golden standard regarding anti-plaque efficacy. The present study aimed to evaluate and compare the anti-plaque efficacy of Kin - Gingival and Epimax mouthwashes. Both these mouthwashes contain the same amount of 0.12% chlorhexidine and 0.05% sodium fluoride.
Materials & Methods
This intervention - experimental study involved 14 participants. Plaque indices were minimized and the participants were instructed on how to use the mouthwash (10cc of mouthwash, every 12 hours for 60 seconds). Afterwards, the subjects were divided into two groups of seven. The study involved no other plaque control method.
The first group initially used the Iranian mouthwash for a week. After 10 days of rest period and minimizing the plaque index again, they used the foreign mouthwash for a week.
The second group initially used the foreign mouthwash for a week. After 10 days of rest period and minimizing the plaque index again, they used the Iranian mouthwash for a week. The results were analyzed by paired-t test.
Results
The mean plaque indices of whole mouth (P=0.04), mandible (P=0.03) and the posterior region (P=0.006) after using the foreign mouthwash were significantly lower compared with the values after using the Iranian type. There was no significant difference between the two mouthwashes in maxilla (P=0.12) and the anterior region (P=0.29). The mean plaque indices related to the Iranian mouthwash were not significantly different between the upper and lower jaws (P=0.54), but the mean plaque index was significantly lower in the anterior region compared with the posterior region (P=0.003). The mean plaque indices related to the foreign mouthwash were not significantly different between the upper and lower jaws (P=0.32), but the mean plaque index was significantly lower in the anterior region compared with the posterior region (P=0.002).
Conclusion
Overall, the foreign mouthwash was more efficient in plaque removal in the posterior mandible compared with the Iranian mouthwash. Both Iranian and foreign mouthwashes were more efficient in the anterior region, whereas they showed no difference in their impacts between the upper and lower jaws.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Effect of Acidulated Phosphate Fluoride (APF) etching duration on the shear bond strength between a Lithium Disilicate-based Glass Ceramic and Composite Resin
16
20
FA
M
Poorzamani
V
Motamedosanyeh
SE
SeyedAlizadeh
S
Kouhkan
Abstract:
Background and aim: Damaged all-ceramic restorations can be restored through bonding with composite resin. Etchants such as acidulated phosphate fluoride (APF 1.23%) and hydrofluoric acid (HF) are often used for this purpose. APF gel is harmless for oral mucosa unlike HF, which can cause tissue irritation. Therefore, the present study aimed to evaluate the shear bond strength between composite resin and ceramic after various durations of surface treatment with APF gel.
Materials and Methods: In this in-vitro study, seventy lithium disilicate ceramic (Empress 2) specimens (16 mm in diameter and 1.5 mm thick) were prepared and divided into 7 groups (n=10). The first group received no surface treatment and served as a control. The second group was treated with 9.6% hydrofluoric acid for 4 minutes and the experimental groups 3 to 7 were surface treated with 1.23% APF gel for durations of 4, 6, 8, 10 and 12 minutes respectively. Afterwards, the shear bond strength of each sample was evaluated. Mean bond strengths (MPa) of samples were analyzed by One-way ANOVA and TUKEY HSD tests in SPSS 17 software.
Results: The mean shear bond strength in the second group was significantly higher than the other groups and equaled 41.01± 14.11 MPa (p=0.0001), while the average bond strengths in the other groups were not significantly different (p>0.05) and increased etching times in the experimental groups treated with APF gel had no effect on the shear bond strength.
Conclusion: It seems that 1.23% APF gel with various etching durations is not a suitable substitute for hydrofluoric acid etchant in surface treatment of lithium disilicate ceramic.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
In vitro comparison of the antimicrobial efficacy of Zataria multiflora®, Chlorhexidine and Sodium Hypochlorite against Enterococcus faecalis and Candida albicans
21
26
FA
MM
Yaghooti Khorasani
R
Bahramabadi
H
Moghbeli
Background & Aim: Suitable root canal irrigants have low toxicity and high antimicrobial efficacy. The aim of the present study was to compare the in vitro inhibitory effects of Zataria Multiflora Boiss essential oil, Chlorhexidine and Sodium hypochlorite on the growth of Enterococcus faecalis and Candida albicans.
Materials and Method: In this in vitro experimental study, 54 samples of the microorganisms under study were cultured on Mueller Hinton agar with Kirby Bauer method. Paper discs were impregnated with 100 mg/ml and 50 mg/ml concentrations of Zataria multiflora essential oil, %0.2 and %0.1 Chlorhexidine and %1 Sodium hypochlorite and were placed on the culture medium. After 48 hours, the inhibition zones were measured in millimeters. Data were analyzed by SPSS software and by ANOVA and Tukey tests.
Results: The inhibition zone of 1% Sodium hypochlorite against Enterococcus faecalis was of greatest diameter followed respectively by 0.2% Chlorhexidine, 0.1% Chlorhexidine, 100 mg/ml concentration of Zataria multiflora essential oil, while 50 mg/ml concentration of this essential oil had the least effect on this microorganism. 100 mg/ml concentration of Zataria multiflora essential oil was most effective against Candida albicans followed respectively by 50 mg/ml concentration of this essential oil, 1% Sodium hypochlorite, 0.2% Chlorhexidine and 0.1% Chlorhexidine which showed the least efficacy.
Conclusion: According to the results, 1% Sodium hypochlorite had the highest inhibitory effect on Enterococcus faecalis, while 100 mg/ml concentration of Zataria multiflora essential oil had the highest inhibitory effect on Candida albicans.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Comparing the efficacy of two types of carbamide peroxide used for intracoronal bleaching of endodontically treated teeth (in vitro)
27
31
FA
K
KHalaj
L
Baradaran Mohajeri
B
RanjbarOmidi
DA
Farhat
Background and aim: the demand for dental bleaching has increased because individual's appearance plays an important role in social relations. The present study aimed to compare the efficacy of an Iranian carbamide peroxide gel (Kimia) with its foreign counterpart (Opalescence PF 15%) used for intracoronal bleaching of discolored teeth.
Materials and methods:
This experimental study was performed on 30 extracted intact central incisors. Root canals were cleaned and shaped with step back technique and were filled with lateral condensation method. Afterwards, gutta percha was removed from 1mm below CEJ and 1mm thick zinc phosphate cement was placed as a liner. Then, the teeth were placed inside 5.25% sodium hypochlorite solution for 24 hours. Whole blood and centrifuge system were used to stain the teeth. Samples were randomly assigned to three groups: 1. Opalescence PF 15% carbamide peroxide 2. Kimia 16% carbamide peroxide 3. Control group (cotton ball impregnated with physiologic serum). Evaluation of the color changes was done once before bleaching and once on the seventh day after application of the bleaching gel. This evaluation was performed with digital camera and Adobe Photoshop 8.0 software. Data were analyzed by SPSS software and T-test.
Results:
The bleaching value was significantly increased in Kimia group. There was a significant statistical difference between the control group and Kimia and Opalescence PF groups (p=0.001) Moreover, there was a significant difference between Kimia and Opalescence PF groups. (p=0.038)
Conclusions:
According to the results of the present study, Kimia carbamide peroxide gel is more efficient than Opalescence PF gel in bleaching the endodontically treated teeth.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Comparative evaluation of root canal configuration in the mandibular left and right second premolars: a CBCT study in an Iranian population
32
38
FA
M
Kazemipoor
M
Poorkheradmand
S
Mirbeigi
Background and aim: Mandibular second premolars show a great diversity in root canal configuration. The aim of this study was to assess the root canal morphology in the mandibular left and right second premolars using CBCT imaging technique.
Materials & Methods: In this descriptive study, 457 CBCT images including human mandibular left and right second premolars were evaluated. CBCT scans were assessed in three orthogonal planes and the differences in the number of roots and root canals were recorded. Data were analyzed by Chi-Square test. The significance level was set at p< 0.04.
Results: From 457 mandibular left and right second premolars, on the left side 94.3% of the teeth had one root and 5.7% had two roots. On the right side, 95.6% of the teeth had one root and 4.4% had two roots. On the left side, 77.9% of the teeth had a single canal and 22.1% had two canals and on the right side 83.4% of the teeth had a single canal and 16.6% had two canals. There was a significant difference in the number of root canals between mandibular left and right second premolars (p=0.036) but no significant difference existed regarding the number of roots (p=0.364).
Conclusions: It seems that the root canal configuration differs between the mandibular left and right second premolars in the studied Iranian population.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Permanent mandibular incisor with an accessory root: a case report and orthodontic treatment plan
39
43
FA
AR
Jaffari-Naemi
N
Ahmadi
M
Alipanahi
Background: Accessory roots are developmental disturbances which can affect any tooth. The prevalence of accessory roots has been reported to be 0.68 %, mostly affecting mandibular canines and mandibular premolars and molars of both jaws, whereas permanent mandibular incisors are rarely affected by crown and root shape anomalies.
Summary: A 17-year-old male with the chief complaint of dental malocclusion referred to the orthodontic department of Islamic Azad University of Tehran. In preliminary examination, a firm projection was palpated on the lingual mucosa of mandibular right lateral incisor. On periapical and panoramic radiographs, an unusual radiopacity attached to the root was detected. CBCT evaluation revealed an accessory root, lingual to the main root. The accessory root was amputated and by proper management, the orthodontic treatment was initiated.
Conclusion: Variations in tooth morphology are uncommon in mandibular incisors. These anomalies present difficulties in endodontic, restorative, prosthodontic and orthodontic treatments. Accurate diagnosis of these variations by using proper clinical and radiographic examinations plays an important role in treatment success. Moreover, the treatment plan should be adjusted according to patient's specific needs.
دانشگاه ازاد اسلامی-واحد دندانپزشکی
Res Dent Sci
2008-4676
12
1
2015
4
1
Myoepithelioma of the palate: a Case Report
44
46
FA
M
Sina
M A
Ghavimi
P
Emamverdizadeh
M
Razbani
Myoepithelioma is a rare benign neoplasm of salivary glands which comprises less than 1% of all salivary gland tumors. This tumor mostly involves the parotid gland and less often involves the minor salivary glands of the oral cavity. In this article, a case of myoepithelioma in the minor salivary glands of the palate is presented along with its clinical and histopathological features and the probable differential diagnoses.