en
jalali
1395
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1
gregorian
2016
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Effects of Light-cured versus No-mix and Self-etch Primer Adhesives on Enamel Discoloration following Orthodontic Bracket Bonding
Introdouction:
According to the importance of enamel discoloration
and controversy regarding the effect of
different orthodontic bonding materials on tooth
discoloration, the aim of this study was to determine
enamel discoloration following orthodontic
brackets using different bonding materials.
Materials and methods: This in-vitro study,
30 recently extracted human premolars with
intact enamel were selected and randomly
divided into three groups after primary color
measurement (T0). In group A, the specimens
were bonded using light-cured adhesive (Transbond
XT); in group B, Transbond plus self-etch
primer was used; and in group C, unite bond
(no-mix) was used on the buccal surface of the
specimens. Lingual surfaces, however, did not
receive any treatment and were considered as
the control group. The samples were immerged
in a solution of tea and coffee. After 1 week, the
second color measurement was performed (T1)
and color changes ΔE between pretreatment
and post immergence state was evaluated. The
third color measurement (T2) was completed
after polishing the surfaces with 24-fluted tungsten
carbide polishing burs and rubber cups, and
color alterations were evaluated between the
base and final state.
Results: Statistical analysis revealed that in all
groups, the enamel color on buccal surfaces had
statistically significant color changes in comparison
with palatal surfaces between the three
stages of treatment (P < 000.1). In groups B and
C, ΔE (T0–T2) was clinically significant (ΔE > 3.3),
and the specimens in group C had the highest
amount of changes in all stages of the treatment.
Conclusion:Bracket bonding on enamel surfaces
with a number of bonding materials in this
study led to detectable enamel discoloration,
which was the highest when using no-mix bonding
material.
Adhesives, Tooth Discoloration, Dental Enamel, Orthodontics, Orthodontic Brackets.
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Maryam
Poosti
Dental Faculty, Islamic Azad University, Tehran, Iran.
No
Ali
Mokhtar
Dental Faculty, Islamic Azad University, Tehran, Iran.
No
Nima
Baniasad
Dental Faculty, Islamic Azad University, Tehran, Iran.
Yes
Roxana
Bahmani
Private practice.
No
Farshid
Ghorbani
Private practice.
No
Saeed
Sadeghian
Private practice.
No
fa
Evaluation of Image Magnification in Digital Panoramic Radiography
Introdouction:
The aim of the present study was to investigate
image magnification in digital panoramic radiography
and assess the effect of anatomical sites
on the magnification in both males and females.
Materials and methods:
In this retrospective study, digital panoramic
radiographs of 48 patients with 202 implants
were investigated. Implant diameter and length
were measured on panoramic radiographs and
the horizontal and vertical magnification rates of
each placed area were calculated based on the
length and width of the placed implant. A twoway
ANOVA test was used to evaluate the magnification
rate in regard to implant location and
gender.
Results:
The range of the magnification factor of the
width was 111.09–126.02, which was lowest in
the maxillary molar region and greatest in the
mandibular anterior region. While the lowest
magnification value of the length (111.58) was
observed in the mandibular molar region, the
highest value (116.09) appeared in the maxillary
premolar area. Hence, there were no significant
differences in image magnification with regard
to anatomical site and gender.
Conclusion:
Digital panoramic radiography can be reliably
used for pre-implant evaluation in various anatomical
sites of the jaws in both genders.
Radiography, Panoramic, Radiographic Magnification, Dental Implants
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Maryam
Paknahad
Oral Radiology Department, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran.
No
Mahvash
Hasani
Oral Radiology Department, Dental School, Shiraz University of Medical Sciences, Shiraz, Iran.
Yes
Mahsa
Hasani
Medical School, Shiraz University of Medical Sciences, Shiraz, Iran.
No
Alireza
Evazpour
Dental School, Shiraz University of Medical Sciences, Shiraz, Iran.
No
en
The Prevalence of Restoration Overhang in Patients Referred to the Dental Clinic of Guilan University of Medical Sciences
Introdouction:
Overhang refers to the extension of restoration
material from the cavity. It has an important role
in decay, plaque accumulation and periodontal
disease, so the aim of this study is determining
the frequency of restoration overhang in
patients in Anzali, Guilan.
Materials and methods:
This descriptive cross-sectional study was
completed using 293 patients who visited
for routine check-ups. The overhangs were
examined on the basis of the cavity type,
restoration type, tooth location, and age by
direct observation using an explorer, dental
floss. After the initial diagnosis of the overhang,
the radiographic reports were examined for final
confirmation.
Results:
41.2%, 0%, 18.2%, and 38.1% were observed
in cavity classes II, III, IV, and V, respectively.
35.8%, 38.2%, 28.1%, and 25% were observed in
mesial, distal, buccal, and lingual regions,
respectively. The highest rate of overhang
frequency in the first molar teeth was 50%
and the lowest overhang amount occurred in
the lateral and canine teeth at 25% and 27.3%,
respectively. Most amalgam restorations had
overhang (37.7%) and the highest amount of
overhang was in the upper jaw (42.5%). The highest
amount of overhang frequency was observed
on the left (41.6%). There was no significant
difference in overhang frequency between men
and women. The lowest and highest amounts
of overhang were observed in the age groups
of <30 (26.9%) and 30–39 (47.8%), respectively,
and was found to be statistically significant.
Conclusion:
The overall frequency of restoration
overhang was 36.6%, most of which was in class II
amalgam restoration in the left first molar teeth
in 30–39 year-olds.
Dental Restoration Failure, Dental Calculus, Prevalence
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Seyedeh Maryam
Tavangar
Department of Operative Dentistry, Dental school, Guilan University of Medical Sciences, Rasht, Iran.
0000-0001-8156-880X
No
Farideh
Darabi
Department of Operative Dentistry, Dental school, Guilan University of Medical Sciences, Rasht, Iran.
No
Reza
Tayefeh Davalloo
Department of Operative Dentistry, Dental school, Guilan University of Medical Sciences, Rasht, Iran.
Yes
Bardia
vadiati Saberi
Department of Periodontics, Dental school, Guilan University of Medical Sciences, Rasht, Iran.
No
Yousef
Jahandideh
Department of Prosthodontics, Dental school, Guilan University of Medical Sciences, Rasht, Iran.
No
Ehsan
Kazemnejad Leili
Department of Oral Pathology, Dental Branch, Islamic Azad University, Tehran, Iran.
No
Niloofar
Tashayodi
Tehran
No
en
A Comparison of Heat Generation in Different Depths of Implant Drilling Site with and without a Sleeve
Introduction:
The purpose of this study was to compare the
heat generated from different depths of an implant
drilling site with and without a sleeve.
Materials and methods:
In this study, 60 cortical bone samples were
used and a load of 2.0 kg was applied. rilling for
implant surgery, we used a diameter of 4.3 mm
and a normal sleeve. Heat was measured from 3
different depths(3,6, and 9 mms). Data was analyzed
with a three-way analysis of variance by
Newman–Keulsmultiple comparison procedure.
The significance level was set to a p-value of
0.05.
Results:
The mean maximum temperature with a sleeve
was 35.4°C and without a sleeve was 34.5°C.
Thermal rise was lowest in the sleeve group and
highest in the sleeveless group. There was a significant
difference between the sleeve and nonsleeve
group (P= 0.002). There was also no significant
differences between the different depths of
the three measurements (P= 0.068).
Conclusion:
Within the scope of this invitro study, thermal
rise during implant site preparation was lower
in conventional drilling compared to the use of
a sleeve. Hence, the difference was statistically
significant.
Dental Implants, Dental Implantation, Temperature.
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Fariborz
Vafaee
Department of Prosthodontics, School of Dental Medicine, Hamadan University of Medical Sciences (UMSHA), Hamadan, Iran.
No
Farnaz
Firouz
Department of Prosthodontics, School of Dental Medicine, Hamadan University of Medical Sciences (UMSHA), Hamadan, Iran.
No
Masoumeh
Khoshhal Khojasteh Zanjani
Department of Periodontics, School of Dental Medicine, Hamadan University of Medical Sciences (UMSHA), Hamadan, Iran.
No
Zahra
Moshiri
Department of Prosthodontics, School of Dental Medicine, Zanjan University of Medical Sciences (ZUMS), Zanjan, Iran.
No
Hadi
Ranjzad
Department of Prosthodontics, School of Dental Medicine, Hamadan University of Medical Sciences (UHSHA), Hamadan, Iran.
Yes
en
A Comparison of Plasma Lipid Levels and Fasting Blood Sugar in Patients with Chronic Periodontitis and in Healthy Individuals
Introdouction:
Recent studies have reported the connection between increased risk of cardiovascular diseases and diabetes with the presence of chronic periodontitis. The aim of this study was to determine the relationship between chronic periodontitis and triglyceride, high- and low-density lipoprotein (HDL and LDL), and glucose levels.
Materials and methods:
A total of 102 individuals participated in this comparative case-control study and were divided into a test group (51 people with chronic periodontitis with at least two periodontal pockets of >5 mm depth) and a control group (individuals with healthy periodontium or gingivitis). Plasma lipid levels and blood glucose were measured, and the data were statistically analyzed using
chi-square and t-tests at p < 0.05 with SPSS version 21.
Results:
A significant increase in serum triglyceride, cholesterol, and glucose (p < 0.0001) was observed in the test group (group I), whereas serum HDL and LDL showed no significant increase in the test group (group I) compared to the control group (group II) (p = 0.244 and p = 0.127, respectively).
Conclusion:
This study suggested a connection between hyperglycemia and hyperlipidemia with chronic periodontitis, however, the etiology could not be precisely determined.
Cardiovascular Diseases, Hyperlipidemias, Periodontal Diseases, Risk Factors.
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Anahita
Ashouri Moghadam
department of periodontology, dental school of Guilan University of Medical Sciences, Rasht, Iran
No
Meysam
Malekzadeh
department of periodontology, dental school of Guilan University of Medical Sciences, Rasht, Iran
Yes
Ramtin
Tavakoli
GUILAN
No
fa
Stafne bone defect in the ramus of the mandible: a case report
Parotid Stafne bone defect is a very rare and infrequent
variant, which is located on the buccal
or lingual surface of the mandibular ascending
ramus. In this paper, a case of parotid Stafne
defect, which was incidentally discovered during
dental radiographic examination, is reported.
This bone defect was observed as a lucent
oval-shaped defect on the lingual aspect of the
right mandibular ramus. Parotid Stafne bone defect
is a rare entity that should not be misinterpreted
by radiologists.
Cone-Beam Computed Tomography, Parotid Gland, Mandible
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Najme
Anbiaee
Oral and maxillofacial radiologist, Department of Oral and Maxillofacial Radiology, Maxillofacial Diseases Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
No
Saeede
Ebrahimi
Department of Oral and Maxillofacial Radiology, Maxillofacial Diseases Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
Yes
Hamed
Ebrahimnejad
Department of Oral and Maxillofacial Radiology, Maxillofacial Diseases Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
No
Maryam
Mohammadzade Rezaie
Department of Oral and Maxillofacial Radiology, Maxillofacial Diseases Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
No
Zoha
Sahebnasagh
Department of Oral and Maxillofacial Radiology, Maxillofacial Diseases Research Center, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.
No