Avicenna Journal of Dental Research
Volume:6 Issue: 2, Dec 2014

To prevent diseases transmission, infection control in dental offices without reducing the accuracy and dimensional stability of impression materials is very important.. The aim of this study was to evaluate the effects of Sanosil disinfectants on the dimensional stability of some usual impression materials.. Three types of impression material, namely, alginate, condensational silicone, and polyether, were used in this study. Impressions were obtained from the master steel model. Fifteen impressions of each material (control group) were immersed in water for ten minutes and impressions of study groups were disinfected by immersion in 2% Sanosil for ten minutes. Then impressions were poured by type III gypsum according to the manufacture''s instruction. Dimensions of casts in the two anterior dimensions, i.e. interval between the anterior abutments and interval between anterior-posterior abutments, were recorded by a digital caliper with the accuracy of 0.01 mm. Data were analyzed with SPSS through two-way ANOVA test.. The results showed that there was no significant difference in the mean dimension of casts prepared by different impression materials in anterior and anterior-posterior dimensions in comparison to the original model after disinfection with Sanosil.. The study revealed that disinfection with 2% Sanosil has no significant effect on casts dimensions of alginate, silicone, and polyether impression and dimensional stability is maintained..

Context: This article reviews the available evidence about the barrier membranes utilized in Guided Tissue Regeneration process to prevent the migration of unfavorable cells to the wound area..Evidence Acquisition: Available evidence about membranes properties and their different uses were reviewed, and the results of clinical and animal studies and systematic reviews were gathered.. A large number of existing membranes with different features and compositions may lead to different study results; none of the available membranes can result in %100 predictable outcomes.. Effectiveness of membranes in treating intrabony defects is very controversial; however, treating furcation defects using membranes was reported to be successful in a large number of studies..

Hemangiomas are the most common benign tumor of infancy that can occur anywhere in the body. Intramuscular hemangiomas (IMH) are accounting for approximately 1% of all cases and the muscles of extremities are the most common sites. Because of scarcity and variable clinical features of these tumors, we decided to report a case of IMH in the upper lip mucosa..Case Report: The patient was a 54-year-old male that was referred to our clinic for swelling of upper lip mucosa and face asymmetry. The lesion was excised. The histological study revealed an IMH.. Surgical excision might be an effective approach in IMH of upper lip. Complete resection minimizes the relapse rate of the tumor and results in favorable cosmetic outcomes..

Radiography is as a part of periodontal examination. Early detection of periodontal disease is important in the prevention of tooth loss and patient’s general health.. The objective of this study was to compare diagnostic accuracy of cone-beam computed tomography (CBCT) with digital direct intraoral radiography, in assessment of periodontal osseous lesions.. Fifty interproximal bone losses were evaluated in this study. First, direct digital intraoral radiography (Sopro-La Ciotat-France) was taken, and then CBCT (Newtom 3G, Verona. Italy) was carried out. Periodontal flap surgery was done to achieve the gold standard. The distance between cementoenamel junction (CEJ) and the bottom of the vertical pattern of bone loss or the most coronal level of bone in horizontal pattern was measured. These measurements were analyzed by paired t test. The intraclass correlation coefficient (ICC) was used to evaluate the degree of agreement between observers.. Accuracy is higher with CBCT in evaluating vertical dimension of periodontal bony defects (0.53 ± 0.59 to 0.56 ± 0.45) (P < 0.001). ICC shows high level of agreement between observers in two image modality.. We conclude that CBCT and digital images can be used in periodontal bone assessments; each modality should be chosen based on defect type and patient’s specific characteristics..

The degree of microleakage is one of the main criteria in evaluating the restorative materials such as glass ionomer (GI) restoratives، which are available in two forms: loose powder and liquid form to be hand-mixed or pre-proportioned in a capsule to be mixed mechanically.. This study was conducted to compare the microleakage of encapsulated GI restoratives with their hand-mixed equivalent.. In this interventional (field trial) study، 40 extracted caries-free deciduous teeth were selected. After preparing class V cavities، teeth were divided into two groups. Cavities in group one were restored with encapsulated self-cured GI restorative (EQUIA، Fuji IX). In the second group، hand-mixed GI restoratives (Fuji IX) were used، which were prepared in accordance with the manufacturers’ recommended powder to liquid mixing ratios. After thermo cycling، the samples were immersed in 0. 5% methylene blue solution for 12 hours. Then، they were sectioned for examination under light microscope. Micro leakage of each restoration was evaluated by the depth scale of the dye penetration along the tooth-restoration interface.. Statistical analysis by Mann-Whitney U test showed no significant difference in micro leakage between encapsulated GI restoratives and their hand-mixed equivalents (P < 0. 05).. There was no difference between micro leakage of hand-mixed and encapsulated GIs and in case of following the manufacturer’s instruction and recommendations، hand-mixed GIs could be as efficient as their encapsulated equivalents..

Oral Lichen Planus (OLP) is a chronic inflammatory disease affecting the oral mucosa in 0.5-2% of the world’s population. It is more common in women compared to men and the mean age at the onset of the lesion is the fourth decade.. The purpose of this study was to evaluate the presence of Helicobacter pylori (H. pylori) in Oral Lichen Planus and Oral Lichenoid Reaction.. A total of 41 biopsies diagnosed as Oral Lichen Planus and Oral Lichenoid Reaction and 15 samples as the control group were selected from the archives of Pathology Department of Loghman Hakim Hospital, Tehran, Iran from 2002 to 2009. All the paraffin blocks were cut for hematoxylin and eosin (H and E) staining to confirm the diagnoses and the samples were then prepared for immunohistochemistry (IHC) staining. Statistical analysis was performed using SPSS statistical software (version 21.0), the chi-squared test and Fisher’s exact test, and independent-samples t test. Statistical significance between the groups was set at P < 0.05.. The H. pylori positivity was found in 29.7% and 14.8% of OLP, and OLR samples, respectively. Statistically significant difference was not observed compared to normal tissues (P = 0.661). The chi-squared test show no significant difference between the frequency of H. pylori positivity and the lesion type, gender, and site. Although H. pylori positivity was found in 59.2%, and 50 % of OLP, and OLR samples, respectively, statistically significant difference was not observed compared to normal tissues (P = 0.838). In addition, the chi-squared test show no significant difference between the site of the lesion and H. pylori positivity. H. pylori positivity was mostly found on the buccal mucosa (64.3%), however, H. pylori negativity was mostly found on the tongue (60 %) (P = 0.309). Additionally, the chi-squared test show no significant difference between the frequency of H. pylori positivity, and the gender (P = 0.517). Independent-samples t test showed no statistically significant difference between age and two patient groups statistically (P = 0.450).. This present study reveals no significant difference between the presence of H. pylori in OLPs and OLRs. Yet, further studies with larger sample size needs to be done to prove this association..

Pharynx is located in close proximity of dentofacial structures. Therefore, a relationship might exist between skeletal malocclusions and the size of the pharyngeal airway.. The aim of the present study was to assess and compare the upper airway dimensions and characteristics of skeletal Class I and Class II patients using cephalometric analysis..Patients and In this retrospective study, lateral cephalograms of 24 Class I and 26 Class II patients, Who were 9-11 years old and had the inclusion criteria, were used for analysis. Cephalograms were traced manually. Depth of the nasopharynx, oropharynx, and hypopharynx, soft palate dimension and position, and hyoid position were measured on the cephalograms. Independent-samples t-test was used for analyzing the differences in the variables of the two groups and Pearson correlation analysis was used for finding any association between the variables.. No significant difference in the upper airway, soft palate, and hyoid variables was found between the two groups (P > 0.05) and no correlation was found between ANB difference and the other variables (P > 0.05).. Pharyngeal airway dimensions, soft palate length, thickness, and position, and hyoid position are not significantly different between skeletal Class I and Class II prepubertal children..

Prevention or management of pain is an important objective in root canal treatment. Post-endodontic pain has always been an important concern for patients and clinicians. Informing patients regarding the possibility of postendodontic pain and drug administration for its management can improve their trust in dentists, raise their pain threshold and increase their tendency to seek further dental treatments.. This study aimed to assess the attitude of Hamadan dentists towards the administration of analgesics for the management of postendodontic pain..Patients and This descriptive, cross-sectional study was conducted in 2011 in Hamadan city, Iran. Data was collected using a questionnaire including demographic information and questions about administration of analgesics for endodontic patients. All participants filled out the questionnaires anonymously. Collected data was analyzed using SPSS version 16.0 and descriptive statistics.. Eighty questionnaires were completed by dentists. Most dentists reported to use ibuprofen mostly to alleviate mild to moderate and severe endodontic pain in healthy individuals. Only 42 dentists (52.5%) used intracanal medicaments to relieve pain.. The overall level of knowledge of general dentists in Hamadan city about the prescription of analgesics was satisfactory. Dentists should be aware of the latest advancements in their field and maintain their level of knowledge by regularly participating in continuous education programs and accessing relevant scientific resources..