Research Article
20/6/2017
Uncorrected Proof scheduled for 9 (2)
Safa Hinnara, Imad Barngkgei, Jihad Abo Nassar
Background:
Numerous studies showed that the convergence angle (CA) of prepared teeth for fixed prosthodontics in the clinical practice is greater than the recommended values.
Objectives:
This cross-sectional study aimed to compare the total occlusal convergence (TOC) angles of metal ceramic fixed prosthodontics among dental students [final-year undergraduate (UG) and Master Prosthodontics (MS) students] and general practitioners (GP) in their private clinics with the recommended value (≤ 12 degrees).
Methods:
The buccolingual (BL) and mesiodistal (MD) TOC of 114, 90, and 111 stone dies referred to UG, MS, and GP, respectively, were measured. These dies included incisors, premolars, and molars. One sample Wilcoxon signed rank test, Mann-Whitney U test, Kruskal-Wallis, and Fisher exact test were used for statistical analysis.
Results:
Mean values of TOC for UG were 27.8 degrees BL and 20.9 degrees MD, whereas they were 30.6 degrees BL and 18.2 degrees MD for MS. GP had TOC of 35.5 degrees BL and 24 degrees MD. GP had significantly higher TOC values than the other groups (0.001 > P value ≤ 0.007). In each group, TOC did not differ when calculated for partial fixed prosthodontic and single crown abutments (0.117 ≤ P value ≤ 0.797). Molars in general had the highest TOC values. Only 0.9%, 3.3%, and 0.9% of UG, MS, and GP, respectively, respected the TOC ≤ 12 degrees.
Conclusions:
In all the groups, tooth preparations were inconsistent with the recommended TOC values, even among specialists in fixed prosthodontics. These results support the existing literature that the recommended values were rarely achieved and may require reconsideration.
Clinical Significance:
Clinically, the CA values of prepared teeth for fixed prosthodontics exceed the recommended values in most cases, not only among general practitioners, but also among students in academic institutes. Thus, the effects of teeth preparations with CA greater than the recommended values on the longevity of the prosthodontics should be further investigated.
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
20/1/2016
Farzaneh Ostovarrad, Faezeh Yousefi, Sepideh Falah-Kooshki, Atena Karimi
Introduction:
Fibrous dysplasia is a developmental bone disease that is characterized by replacement of normal bone with fibrous tissue.
Case Presentation:
A 58-year-old man came to the Oral and Maxillofacial Radiology Department, Hamadan College of Dentistry, with swelling on the left side of the maxilla. The lesion was diagnosed to be fibrous dysplasia of the maxilla with involvement of the maxillary sinus, based on the radiographic and histopathologic features.
Conclusions:
Some radiographic features, such as a ground glass appearance and reduction in antrum size while keeping the original shape, are characterizations of fibrous dysplasia.
Research Article
25/6/2016
Massoumeh Khoshhal, Fariborz Vafaee, Oranous Moradi, Neda Rastegarfard, Erfan Abbasi, Shahram Sharifi
Background:
The minimum standard treatment plan for the reconstruction of an edentulous mandible, according to York, is an overdenture supported by two implants.
Objectives:
The aims of this study were to evaluate and compare the clinical outcomes and peri-implant marginal bone loss around implants in patients treated with mandibular overdentures supported by 1, 2, 3, 4, and 5 implants.
Materials and Methods:
A total of 25 patients with a mean age of 62.7 years old, who were treated with implant supported mandibular overdentures at Hamedan’s faculty of dentistry, were enrolled in this cross-sectional study. Among these patients, 6 had overdentures supported by one implant, 9 had overdentures supported by two implants, 2 had overdentures supported by three implants, 5 had overdentures supported by 4 implants, and 3 had overdentures supported by 5 implants. The clinical and radiographic parameters around the implants were assessed, including: probing depth, width of keratinized gingiva, bleeding on probing, peri-implant inflammation, calculus formation, implant mobility, adverse events, and radiographic signs of peri-implant bone loss (distance between the implant shoulder and the level of the mesial and distal proximal bone). The ANOVA and the Fisher’s Exact test were used to evaluate the significant differences among the groups.
Results:
None of the implants had loosened and no adverse events were seen around the implants. Additionally, the clinical variables did not show significant correlation with the number of implants. Overall, the bone resorption showed an inverse and significant relationship with the number of implants (P = 0.001).
Conclusions:
With mandibular overdentures supported by 1, 2, 3, 4, and 5 implants, favorable clinical outcomes can be achieved. However, when increasing the number of implants, marginal bone loss decreases. For example, the patients with five implants showed less marginal bone loss than those with a lesser number of implants.
Case Report
5/9/2016
Mohammad Esmaelizadeh, Abbas Shokri, Zakieyeh Donyavi, Farzaneh Ostovarrad, Hadi Ranjzad, Shiva Yarmohammadi, Frideh Vahidnia
Introduction:
A dentigerous cyst is the most commonly developed cyst of the jaw. It is most frequently associated with impacted canines and mandibular third molars. Bilateral dentigerous cysts are rare and are generally associated with developmental syndromes or systemic diseases.
Case Presentation:
We report on an eight-year-old boy who presented with a complaint of bilateral malposed first mandibular molars. There was no complaint of pain and no swelling. An intraoral examination revealed buccal tipping of both the right and left first mandibular molars with slight swelling. The overlying mucosa was completely normal and there was no tenderness on palpation. This unusual case occurrence associated with the crowns of the bilateral impacted lower second molars. There are no cases reported with bilateral dentigerous cyst involving mandibular second molars. The clinical and radiographic findings, especially the cone beam computed tomography (CBCT) views, were suggestive of dentigerous cysts.
Conclusions:
After the surgical removal of the cysts, the specimens were sent for histopathological evaluation. A microscopic examination suggested infected dentigerous cysts.
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
Research Article
5/9/2016
Fatemeh Ezoddini, Soghra Yassaei, Sahar Ghanea
Background:
This study was performed to assess the diagnostic accuracy of panoramic radiography in determining the position of impacted permanent maxillary canines.
Methods:
This was a diagnostic study to define how accurate panoramic radiography is in determining the position of impacted permanent maxillary canines. In panoramic radiographs of 33 patients (with 44 total impacted maxillary canines), α and β angulation, magnification and superimposition were assessed. The long axis of the impacted canine to the occlusal line was named α angle. The long axis of the impacted canine to the vertebral line was named β angle. The real position of the teeth was determined by CBCT. Sensitivity, specificity, positive predictive value, negative predictive value and accuracy of panoramic radiography were calculated. Kappa test was used to assess the agreement between panoramic radiography and CBCT. Roc curves were used to define cut-off point values.
Results:
α angulation showed 84.3% of palatal impacted maxillary canines and 41.6% of buccal teeth in their real position. β angulation showed these positions in 81.8% and 87.5% of cases, magnification in 37.5% and 58.3% of cases and superimposition in 53.6% and 100% of cases. The degree of agreement between CBCT and α angulation, β angulation, magnification, and superimposition was 0.275, 0.526, 0.03 and 0.224, respectively. Cut-off point values for α angulation, β angulation and CII were 65 degrees, 63 degrees and 1.11, respectively.
Conclusions:
Among different methods, β angulation showed the highest accuracy in the localization of impacted maxillary canines. α angulation and superimposition ranked second and third in terms of accuracy. Magnification had the least accuracy.
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.
Review Article
5/9/2016
Shapour Yaripoor, Pejman Janbaz
Context:
Using a reliable fixation method after ramus sagittal split osteotomy in order to reduce the chances of treatment relapse and condyle changes is still one of the most noteworthy issues discussed among maxillofacial surgeons. In this study, the results of the up-to-date papers were collected, which identify the effects of the fixation method on the post-operative results, to give the reader a comprehensive view of the new concepts.
Evidence Acquisition:
The most frequent mandibular surgeries, setbacks, and advancements via the bilateral sagittal split osteotomy technique were used for a literature search due to the abundance of related articles. Consequently, the following keywords were applied: sagittal split ramus osteotomy, orthognathic surgery, rigid fixation, non-rigid fixation, postoperative relapse, and postoperative stability.
Results:
The articles were classified according to the surgery procedure: mandibular advancement surgery or mandibular setback surgery. The relapse pattern can be divided into two categories: an early relapse, which is strongly related to the surgery procedure, and a late relapse, which can be attributed to the physiologic changes, such as a growth map. The contributing factors can be considered to be the following: a change in ramus in inclination, the mandibular plane, and the fixation type.
Conclusions:
Using rigid fixation techniques after bilateral sagittal split ramus osteotomy will optimize the stability, but this stability is not influenced by the method of this rigid fixation; although the most commonly suggested technique, bicortical screws, is in the inverted-L position
