Research Article
20/5/2017
Gholamhossein Ramezani, Maryam Alsadat Hosseini
Objectives:
Since earlier studies on the association between dental caries with birth problems are very controversial, this study assessed the potential association between DMFT index with low birth and preterm birth.
Methods:
In this matched case-control study, 150 children were divided into 75 case (premature birth and low birth weight) and 75 control subjects. The 2 groups were balanced according to age, gender, socioeconomic statuses (including mother’s and father’s education, family size, district of residence, and type of the kindergarten), mother’s job (yes/no), common types of diets during the first 2 years of life, brushing, dental visits, being right-handed or left-handed, and fluoride therapy. The DMFT of children were assessed by a dental student. Their gestational age at birth and birth weight were asked from their parents. The effects of the factors premature birth (less than 37 weeks) and low birth weight (less than 2500 gm) on DMFT were assessed using Chi-square test (α = 0.05).
Results:
The 2 groups did not have any significant differences regarding the balanced characteristics. We did not detect a statistically significant result between case children with DMFT > 2 and low-birth weight (P = 0.065) defined as weights ≤ 2500 gm or > 2500 gm (P = 0.174). This study also failed to find a significant result regarding gestational age and DMFT (P = 0.480).
Conclusions:
This study did not detect significant associations between low birth weight or preterm birth and DMFT values in primary dentition.
Research Article
30/5/2017
Uncorrected Proof scheduled for 9 (2)
Shahin Kasraie, Mona Malek, Zahra Khamverdi, Maryam Mojtahedi
Background and Objectives:
Previous studies have shown that increasing collagen resistance to degradation stabilizes the resin-dentin interface and collagen cross-linkers can prevent the degradation of collagen fibrils as such. This study sought to assess the efficacy of light-activated riboflavin for collagen cross-linking and optimizing the micro tensile bond strength (µTBS) of an etch and rinse adhesive system to dentin.
Methods:
Occlusal surfaces of 12 sound premolars were ground in order to expose dentin. The teeth were randomly divided into two groups. Adper single bond was applied on etched dentin and light cured in the control group and Composite was then applied. In the test group, all the steps were done in a similar manner to the control group with the difference that after acid etching, 0.1% riboflavin solution was applied on dentin surface and was activated by blue light irradiation for 2 minutes. After thermocycling, the teeth were sectioned in 2 directions in such a way that 14 resin-dentin sticks with 1 mm2 cross-section were prepared in each group (n = 14). The µTBS of samples was then measured and analyzed with independent t-test. The statistical analyses’ significance level was set at α = 0.05. Mode of failure was determined under a stereomicroscope at × 40 magnification. Moreover, the cross-linking effect of light-activated riboflavin solution on type I collagen was assessed using sodium dodecyl sulfate-polyacrylamide gel electrophoresis (SDS-PAGE) and resin-dentin interface was photographed under a scanning electron microscope (SEM).
Results:
In gel electrophoresis, bands were formed in wells in the test group (and not in the negative control group). T-test found no significant difference in the mean µTBS of the test and the control groups (P = 0.9).
Conclusions:
Based on the results, light-activated riboflavin was capable of collagen cross-linking, but its application as a collagen cross-linker on etched dentin had no significant effect on µTBS of Single Bond dentin bonding agent to dentin.
Case Report
9/7/2016
Elham Khoshbin, Zakieh Donyavi, Saeedeh Ghaneie
Introduction:
Accurate diagnosis of root canal morphology and anatomy is essential for thorough shaping and cleaning of the entire root canal system and consequent successful root canal treatment. In a mandibular second premolar, it is rare to find extra roots and canals. The anatomy of the pulp chamber floor in premolars with more than one canal usually reveals one lingual and two buccal orifices at the same level.
Case Presentation:
This case report explains nonsurgical endodontic treatment of a mandibular second premolar with three separate canals and three separate mesiobuccal, mesiolingual, and distolingual orifices.
Discussion:
Mandibular premolars have always proven to be an enigma to endodontist, as they exhibit a high degree of variability in their root canal morphology when compared to any other tooth in the oral cavity. Flat roots are much more likely to contain multiple canals and intercanal ramifications. In such cases, to obtain predictable results, high quality preoperative radiographs should be available at different horizontal angulations and carefully evaluated to detect the presence of extra root canals.
Case Report
27/2/2016
Zakieh Donyavi, Elham Khoshbin, Zeinab Kavandi
Introduction:
One-step apexification using mineral trioxide aggregate (MTA) has been reported as an alternative treatment modality with more benefits than the use of long-term calcium hydroxide (CaOH) for teeth with an open apex. However, the orthograde placement of MTA is a challenging procedure in terms of length control, especially in teeth with a wide-open apex. Therefore, we took advantage of the desirable properties of Ca(OH)2 in the formation of apical barriers in order to control the length of MTA during placement.
Case Presentation:
We would like to report the successful treatment of tooth 8 (in a 10-year-old girl) with an open apex and periapical lesions. In this case, we first used calcium hydroxide to form the primary apical barrier for six months and then we placed an MTA plug.
Conclusions:
Based on evidence, both MTA and Ca(OH)2 can be used for the endodontic treatment of non-vital immature teeth. In this case, we took advantage of special properties of MTA and Ca(OH)2 in apexification.
Case Report
17/7/2016
Marco Rossi, Francesco Saverio Ludovichetti, Christian Bacci
Introduction:
A new piezoelectric surgical device, a new system for cutting bone system, has recently been developed. It uses low-frequency ultrasonic vibrations to shape and cut bone.
Case Presentation:
In this paper, we report the case of a 70-year-old woman affected by (G2, T1, M0) oral cancer treated with osteotomy performed using this piezoelectric device. The case presents the complete surgical excision of a fornix squamous cell carcinoma in which the marginal mandibulectomy was effected by a piezoelectric system.
Conclusions:
People who have conditions involving bone that need to be surgically removed specifically nearby soft tissues or important structures (vessels, nerves, or brain), may benefit from this device. In the oral cavity, where the presence of essential structures may hinder safe osteotomy, the piezoelectric device allows the surgeon to cut bone without damaging nerves, glands, and vessels, even when in contact with them. The presence of angled inserts is also fundamental and facilitates osteotomies in areas that are unreachable by conventional cutters and burs.
Case Report
4/7/2016
Parviz Deyhimi, Mohammad Razavi, Ali Tavakolli Hoseini, Batoul Alishahi
Introduction:
Small cell neuroendocrine carcinomas (SmCCs) of the salivary glands are rare high grade malignant neoplasms, and the identification of these lesions is often difficult. Histopathological features alone are not sufficient for the diagnosis of SmCCs, and immunohistochemical (IHC) staining is almost always mandatory for confirming the diagnosis.
Case Presentation:
We report one salivary SmCC case in a female who presented with swelling on the left side of the face. For a distinct diagnosis, histopathological and IHC evaluation was performed.
Conclusions:
The presentation of these cases can be helpful for the histopathological differential diagnosis of similar tumors
Case Report
1/10/2016
Reza Farhangi, Pejman Janbaz
Introduction:
Although ectopic eruptions of teeth into the nasal cavity have been previously reported, the eruption of a tooth into the turbinates of the nose is quite rare. This report describes a case in which a tooth ectopically erupted into the inferior turbinate of the nose. Signs and symptoms of the occurrence, as well as its diagnosis and treatment, are also delineated in this case report.
Case Presentation:
A 32-year-old man with swelling in the left paranasal area of the face was referred to the department of Oral and maxillofacial surgery for diagnosis and treatment. A diagnostic workup resulted in the diagnosis of an ectopic tooth eruption. The tooth was removed via the use of a transoral approach and without any complications.
Conclusions:
This case report alerts surgeons to consider the possibility of an eruption of a tooth into the nasal cavity or inferior turbinate of the nose when panoramic radiography reveals an impacted canine tooth located high in the maxilla.
Research Article
30/6/2017
Uncorrected Proof scheduled for 9 (2)
Hassan Mohajerani, Nima Sadeghi, Taraneh Montazemi, Afsaneh Montazemi
Objectives:
This study aimed to assess the incidence and causes of zygomatic fractures in patients referring to Tehran Taleghani hospital during a 10-year period.
Methods:
This descriptive, retrospective, cross-sectional study was conducted on 294 records of patients (248 males and 46 females) with zygomatic fractures selected via census in Tehran Taleghani hospital from 2003 to 2013. Age, gender, cause of fracture, type of treatment modality, and post-operative complications were extracted and reported by using descriptive statistics. Data were analyzed using chi square and Fisher’s exact tests.
Results:
Most patients were aged 20 - 30 years (n = 121, 42.1%). Car accident (n = 97, 33%), motorcycle accident (n = 89, 30.3%), and fall from height (n = 44, 15.1%) were the most common causes of fractures. The most common associated fracture was mandibular fracture (n = 104, 35.4%). The most common type of zygomatic fracture was zygomaticomaxillary complex (ZMC) fractures (87.3%) treated by open reduction with internal fixation (84.8%). Paresthesia or hypoesthesia of the infraorbital nerve (n = 177, 64.6%) was the most common complication. Periorbital ecchymosis (n = 159, 58%) was the most common ocular complication. Epistaxis (P = 0.01), paresthesia and hypoesthesia of infraorbital nerve (P = 0.016), enophthalmos (P = 0.014), step formation at the inferior orbital rim (P < 0.001), periorbital ecchymosis (P < 0.001), and subconjunctival hemorrhage (P = 0.006) had a higher frequency in ZMC compared to non-ZMC fractures.
Conclusions:
Zygomatic fractures comprised 22.8% of all maxillofacial injuries and they occurred mainly due to traffic accidents with a higher prevalence in males aged 20 - 30 years. They were mostly treated by open reduction with internal fixation.
Research Article
30/6/2017
Uncorrected Proof scheduled for 9 (2)
Zahra Jaberi Ansari, Maryam Moezzizadeh, Haleh Valizadeh Haghi
Background:
Blood contamination could interfere with the bonding of resin materials to different substrates.
Objectives:
The purpose of this study was to evaluate the effects of various methods of removing blood contamination between composite resin increments on resin-resin micro-shear bond strength.
Methods:
90 composite blocks (Valux Plus, 3M ESPE) measuring 2 × 2 × 8 mm were prepared in 6 groups: one group was not contaminated as the control (group 1); for other groups the surface was contaminated with blood then rinsed and dried. One group only received this treatment (group 2) and others were etched with phosphoric acid (group 3), phosphoric acid and a bonding agent (Margin Bond, Coltene) (group 4), cleaned with 98% ethanol (group 5), and had 0.5 mm of their outer surface removed (group 6). Next, the second increments of composite were applied in the form of cylinders of 0.7 mm diameter and 1 mm height on the top surfaces of the specimens and were then light cured. Specimens underwent micro-shear bond strength testing. Data were analyzed by Kolmogorov-Smirnov and analysis of variance (ANOVA) tests.
Results:
The mean value of bond strength was 23 ± 3.60 MPa for the control group, 17.89 ± 6.52 MPa for group 2, 19.40 ± 6.08 MPa for group 3, 20.20 ± 5.72 MPa for group 4, 20.01 ± 6.83 MPa for group 5, and 19.10 ± 6.20 MPa for group 6. There were no significant differences between the groups.
Conclusions:
All the decontamination methods in this study could increase the resin-resin bond strength to the level of the control group.
Research Article
30/6/2017
Uncorrected Proof scheduled for 9 (2)
Mohammad Ali Hemmati, Faeze Hamze, Mostafa Fatemi, Farhood Najafi, Mohammad Bagher Rezvani
Background:
Zinc oxide (ZnO) that is a main component of Zinc Polycarboxylate and Zinc Phosphate conventional cements has been incorporated into many dental materials for mechanical enhancement. Moreover, by decreasing the particle size of ZnO down to nano-scale, its beneficial effects would tremendously increase because the nanoparticles have considerably higher surface to volume ratio compared to micro-particles.
Objectives:
The aim of this study was to assess mechanical, physical, and chemical properties of Zinc Polycarboxylate and Zinc Phosphate cements containing Zinc oxide nanoparticles.
Methods:
Three powder formulations were prepared for either of the cements based on the nanoparticles content (0 wt%, 10 wt% before, and 10 wt% after sintering the powder). The prepared groups were compared with each other in terms of their compressive strength, setting time, film thickness, and acid erosion resistance using one way ANOVA and Tukey HSD statistical tests (α = 0.05).
Results:
Incorporating zinc oxide nanoparticles did not significantly change neither the film thickness nor the acid erosion resistance of the cements (P > 0.05). Nevertheless, the setting time of zinc phosphate significantly decreased by adding nanoparticles (P < 0.05) while there was no statistical difference in zinc polycarboxylate groups (P > 0.05). On the other hand, although incorporating nanoparticles significantly reduced the compressive strength of zinc phosphate (P < 0.05), it was noticeably improved in zinc polycarboxylate groups (P < 0.05).
Conclusions:
By incorporating 10 wt% of nano zinc oxide into zinc phosphate and zinc polycarboxylate cements, their compressive strength are more affected rather than their setting time, film thickness, and acid erosion resistance.
Case Report
30/6/2017
Uncorrected Proof scheduled for 9 (2)
Zakiyeh Donyavi, Mohammad Esmaeilzadeh, Najme Kermani
Introduction:
Knowledge about the anatomy and morphology of the root canal system plays an important role in the prognosis of endodontic treatment and its success. Maxillary 3rd molars with 2 distobuccal canals are rarely reported. Herein is the report of a 3rd maxillary molar with 2 canals in the distobuccal root and description of its successful endodontic treatment.
Case Report:
The patient was a 67-year-old male referred to a private endodontic clinic complaining of pain in his maxillary right 3rd molar tooth. With the diagnosis of irreversible pulpitis, the tooth underwent root canal therapy, during which, after thorough negotiation of orifices, a 2nd distobuccal canal was found. Cleaning and shaping were carried out and root canals were filled. A follow-up was scheduled to ensure a successful endodontic treatment.
Conclusions:
In the current case, no adjunct diagnostic modality was used. The additional canal was found only by extending the access cavity and paying attention to landmarks by probing the fissures and grooves between the main orifices, but it seems that use of new methods can enhance a successful treatment, especially in the elderly patients.
