Comparative Analysis of Dimensional Accuracy of Two Types of Silicone Impression Materials: Optosil and Elite-HD
Amini
Parviz
Associate Professor, Department of Prosthodontics, Faculty of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
author
Amin
Rahpeyma
Assistant Professor, Department of Maxillofacial Surgery, Faculty of Dentistry, Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
Maryam
Hejazi
Resident of Prosthodontics, Department of Prosthodontics, Faculty of Dentistry, Kerman University of Medical Sciences, Kerman, Iran
author
text
article
2017
eng
Statement of the Problem: Understanding about impression materials, their properties, uses and manipulation can guide operators towards having more successful restorations. Purpose: The aim of this in vitro study was to compare the accuracy of a condensation silicone impression material, Optosil, and an addition poly siloxane impression material, Elite-HD. Materials and Method: A laboratory model with two metallic dies was used to make impression. A horizontal notch on one of the two dies simulated an undercut. Ten impressions were made by each impression material by the putty-wash technique. After pouring impressions with velmix die stone, a total of 20 stone casts were made from both materials. Measurements of casts were compared with the master model. Statistical analyses were performed using t-test. Result: This results of this study showed that the height of die without undercut decreased in both groups. Also the height above the undercut decreased in both groups, which was more obvious in Elite-HD group than Optosil group. The distance between dies increased in both groups, with higher figures for Elite-HD. So, Optosil is a more accurate material for registering inter-abutment distance than Elite-HD. The diameter of die under the undercut decreased in Optosil group and was similar to the master model in Elite-HD. Statistical analysis showed significant differences between these two groups in the distance between abutments (p=0.001), the diameter of die under the undercut (p=0.014) and the height of die above undercut(p=0.057). Conclusion: Optosil is more accurate in registering inter-abutment distance than Elite-HD, so Optosil is preferred for fixed partial denture impressions. Since Elite-HD showed more accuracy in C measurements than Optosil, it is preferred for single crown impressions.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
1
6
https://jdmt.mums.ac.ir/article_7946_0c9b8df0a8bc2aa47046b2f398a962cb.pdf
dx.doi.org/10.22038/jdmt.2016.7946
Evaluation of Pound concept in determination of mediolateral mandibular posterior teeth position
Majid
Naser Khaki
Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Maryam
Mohajerfar
Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Masood
Ejlalai
Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Sara
Tvakolizadeh
Assistant Professor, Department of Prosthodontics, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
text
article
2017
eng
Background: The ideal teeth arrangement is an important step for success in complete denture fabrication. There are different methods for determining the posterior denture teeth location. The purpose of this study was the comparison of posterior mandibular teeth location in the study group with Pound or Misch theory. Material and methods: An alginate mandibular impression of 80 dentate patients was taken and poured with dental stone. Retromolar pad area, mesial of canine and the lingual cusps of each posterior tooth marked on the cast and then transferred to the graded paper. Distance of each lingual cusp from the internal line of Pound triangle was measured. Data were analyzed with SPSS version 16.0. Result: In the study group, the average distance of lingual mandibular cusp from the internal line of Pound triangle was 1.69 mm in first premolars, 0.94 mm in second premolars, 0.7 mm in first molars and 0.75 mm in second molars. Conclusion: In most cases, distance of lingual mandibular cusps was within 1 mm of Pound triangle. Results were more similar to the Pound rather than the Misch theory.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
7
10
https://jdmt.mums.ac.ir/article_7891_e3325b9260a0eff0397a4282a25b7036.pdf
dx.doi.org/10.22038/jdmt.2016.7891
Oral manifestations and related factors of HIV positive patients in south-east of Iran
Shirin
Saravani
Assistant Professor, Oral and Dental Disease Research Centre, Department of oral & maxillofacial pathology, Faculty of dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
author
Tahereh
Nosratzehi
Assistant Professor, Oral and Dental Disease Research Centre, Department of oral medicine, Faculty of dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
author
Sarvar
Mir
Dentist, Hirmand Health Network, Zabol University of Medical Sciences, Zabol, Iran
author
text
article
2017
eng
Introduction: Oral manifestations can be the first signs of human immunodeficiency virus/acquired immunodeficiency syndrome (HIV/AIDS) and a useful marker for the progression of this disease. The present study aimed to determine the prevalence of oral manifestations and examine their relationship with socio-demographic factors in HIV-positive patients in the health centers affiliated to Zahedan University of Medical Sciences (Southeast Iran). Methods: In this cross-sectional study in addition to determining oral manifestations based on the classification of EC-clearing house (European Commission clearing house), information such as age, gender, marital status, residence, education, occupation, habits, oral hygiene, loss of weight in the last six months. Body Mass Index (BMI), mode of HIV transmission, stage of disease, anti-retroviral therapy (ART), and duration of HIV were gathered through direct question from the patients or the information contained in their records. Then the relationship between various factors and oral manifestations was analyzed using Chi-square, Fisher’s Exact Test, Student T Test, Mann- Whitney tests and logistic regression. Results: Oral examination was performed on 119 HIV-positive patients who were 69.7% male and 30.3% female and had a mean age of 35.4±12.7 years. Oral manifestations were found in 57.1% of the patients. Pseudomembranous candidiasis (34.1%) and linear gingival erythema (33%) were the most common lesions in these patients. The probability of oral manifestations occurrence increased with age and duration of smoking in smokers with HIV (P=0.036 and P=0.012, respectively). Conclusion: Most oral manifestations were those strongly associated with HIV infection (91%). Timely diagnosis and treatment of oral manifestations in HIV patients should be considered in conjunction with other treatments.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
11
18
https://jdmt.mums.ac.ir/article_7871_c93faab43583c78080bf35fa702b7090.pdf
dx.doi.org/10.22038/jdmt.2016.7871
Effects of three different mouthwashes on the surface characteristics of nickel-titanium and Stainless steel archwires in orthodontics
Maryam
Omidkhoda
Dental Materials Research Center, Associate professor, Department of Orthodontics, Faculty of Dentistry, Mashhad, Iran
author
Maryam
Poosti
Assistant Professor, Orthodontic Department, School of Dentistry, Islamic Azad University of Medical Sciences, Tehran, Iran
author
Zoha
Sahebnasagh
Assistant Professor, Department of Oral and Maxillofacial Radiology, School of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
author
Seyed Mojtaba
Zebarjad
Department of Materials Science and Engineering, Engineering Faculty, Shiraz University, Shiraz, Iran
author
Zahra
Sahebnasagh
Assistant Professor, Department of Oral and Maxillofacial Radiology, School of Dentistry, Zahedan University of Medical Sciences, Zahedan, Iran
author
text
article
2017
eng
Introduction: Patients are recommended regular using of mouthwashes to control dental caries or periodontal diseases since orthodontic treatment may have detrimental effects on the tooth structures. However, chemical agents may potentially damage metal components of orthodontic appliances. The aim of this study was to evaluate the influence of three mouthwashes on the surface characteristics of nickel–titanium (NiTi) and Stainless steel (SS) arch wires. Methods and Materials: 15 pieces of 0.016 inch NiTi and 15 pieces of 0.016-inch SS wires were randomly assigned into 5 groups including 2 controls (as- received and artificial saliva) and 3 experimental groups. The samples in all groups were stored in artificial saliva in an incubator at 37˚C for one month, after that, the test groups were immersed in Chlorhexidine 0.12%, Hydrogen peroxide 0.12% and Persica mouth washes for 30 min, 1.5 h and 1.5 h, respectively. Then, the samples were washed by distilled water and returned to artificial saliva for more than two months. Surface topography changes and the number of corrosion holes were characterized via a scanning electron microscope (SEM).Two way ANOVA and Tukey tests were used to compare groups. Results: SEM photographs of the present study showed significant corrosion rate among "as- received" group and Persica (p=0.04), Chlorhexidine (p=0.02), and artificial saliva group (p=0.008) in NiTi wires, but there was no significant difference in the surface topography between any of the groups in SS wires. Conclusion: Alterations in surface of NiTi wires were significantly more than SS wires. Although not significant, 0.12% Chlorhexidine and Peroxide showed higher pitting view on SS and NiTi wires, respectively compared to other mouthwashes
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
19
26
https://jdmt.mums.ac.ir/article_8106_7dfc3d7008b30f361d4da370d9818ee5.pdf
dx.doi.org/10.22038/jdmt.2016.8106
Cast Partial Denture versus Acrylic Partial Denture for Replacement of Missing Teeth in Partially Edentulous Patients
Pramita
Suwal
Additional Professor, Department of Prosthodontics, B. P. Koirala Institute of Health Sciences, Dharan, Nepal
author
Raj Kumar
Singh
Professor, Department of Prosthodontics, B. P. Koirala Institute of Health Sciences, Dharan, Nepal.
author
Ashok
Ayer
Assistant Professor, Department of Conservative Dentistry & Endodontics, B. P. Koirala Institute of Health Sciences, Dharan, Nepal
author
Deepak Kumar
Roy
Postgraduate resident, Department of Conservative Dentistry & Endodontics, B. P. Koirala Institute of Health Sciences, Dharan, Nepal.
author
Roshan Kumar
Roy
Lecturer, Department of Community Medicine, Nepalgunj Medical College, Nepalgunj, Nepal.
author
text
article
2017
eng
Aim: To compare the effects of cast partial denture with conventional all acrylic denture in respect to retention, stability, masticatory efficiency, comfort and periodontal health of abutments. Methods: 50 adult partially edentulous patient seeking for replacement of missing teeth having Kennedy class I and II arches with or without modification areas were selected for the study. Group-A was treated with cast partial denture and Group-B with acrylic partial denture. Data collected during follow-up visit of 3 months, 6 months, and 1 year by evaluating retention, stability, masticatory efficiency, comfort, periodontal health of abutment. Results: Chi-square test was applied to find out differences between the groups at 95% confidence interval where p = 0.05. One year comparison shows that cast partial denture maintained retention and stability better than acrylic partial denture (p< 0.05). The masticatory efficiency was significantly compromising from 3rd month to 1 year in all acrylic partial denture groups (p< 0.05). The comfort of patient with cast partial denture was maintained better during the observation period (p< 0.05). Periodontal health of abutment was gradually deteriorated in all acrylic denture group (p<0.05). Conclusions: With adequate maintenance of oral and denture hygiene at a regular interval, cast partial denture compared with acrylic partial denture provides better results in terms of retention, stability, comfort and periodontal health of abutment.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
27
34
https://jdmt.mums.ac.ir/article_7841_bec5ed3032bd8fbc08f1c2c07b85ef59.pdf
dx.doi.org/10.22038/jdmt.2016.7841
Central Giant Cell Granuloma of the Jaws: Correlation between Vascularity and Biologic Behavior
Saede
Atarbashi Moghadam
Assistant Professor, Department of Oral and Maxillofacial Pathology, School of Dentistry, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Maedeh
Ghorbanpour
Adjunct Assistant Professor, Department of Oral and Maxillofacial Pathology, School of Dentistry, Tehran University of Medical Sciences, Tehran, Iran
author
text
article
2017
eng
Introduction: Giant cell lesions of the bone comprise a group of jaw bone pathologies. Different pathogeneses such as reactive, vascular or neoplastic have been proposed for these lesions. In addition, differentiating between aggressive and nonaggressive central giant cell granuloma (CGCG) of the jaws based on histopathologic features is still impossible and due to different treatment protocols for the two groups, correct diagnosis is necessary. The purpose of this study was to compare the expression of CD34 between aggressive and nonaggressive CGCGs of the jaws. Methods & Materials: This retrospective study was carried out on 16 paraffin blocks in each aggressive and nonaggressive CGCGs group. The expression of CD34 was evaluated with immunohistochemical technique. Afterwards, t-test was used for quantitative evaluation and comparison of CD34 expression among the two groups. Eventually, statistical analysis was performed using Spss20 software. Significance was assigned at p < 0.05. Results: In the present study, the average age of patients in aggressive and nonaggressive groups was 20.93±8.08 and 26.18±16.97, respectively. In both groups, female predilection was observed. Mandible was the most common site of involvement in the aggressive group and the distribution of nonaggressive lesions was equal between both jaws. Although the expression of CD34 in the aggressive group was higher than the nonaggressive group, no statistically significant difference was seen (p=0.15). Conclusion: According to the results of the current study, it appears that CD34 protein cannot be used for identifying the clinical behavior of CGCGs.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
35
39
https://jdmt.mums.ac.ir/article_8103_952cf2a88816609a4d5332e25729c638.pdf
dx.doi.org/10.22038/jdmt.2016.8103
Hybrid Odontogenic Lesion: A Rare Entity
Reza
Imani
Postgraduate student, Oral and Maxillofacial Pathology Department, Dental Faculty, Babol University of Medical Sciences
author
Naghmeh
Jamaatloo
Postgraduate student, Oral and Maxillofacial Pathology Department, Dental Faculty, Babol University of Medical Sciences
author
Maryam
Seyedmajidi
Associate Professor, Dental materials research center, Dental Faculty, Babol University of Medical Sciences
author
Oveis
Khakbaz Baboli
Associate Professor, Dental materials research center, Dental Faculty, Babol University of Medical Sciences
author
text
article
2017
eng
Hybrid tumors are very rare tumors composed of two different tumor entities, each of which conforms to an exactly defined tumor category. A 14-year-old boy was referred for an intraosseous painless lesion with a histopathological feature of multiple odontogenic lesions including calcifying odontogenic cyst, complex odontoma and ameloblastic fibro-odontoma. The final diagnosis considered to be a hybrid odontogenic lesion.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
40
43
https://jdmt.mums.ac.ir/article_7438_194ee291b80b68eff85bea3ff5908c7b.pdf
dx.doi.org/10.22038/jdmt.2016.7438
Endodontic Therapy of the Periapical Lesion in the Anterior Mandibular in a Patient with Tricho-Dento-Osseous Syndrome and Consumer of Immunosuppressive Drug: A Case Report
Elaheh
Moghim Farooji
Department of Endodontics, Dental School, Hormozgan University of Medical Sciences, Bandarabbas, Iran
author
Zeinab
Kazemi
Postgraduate Student of Endodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
author
Saeed
Moradi
Professors of Endodontics, Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2017
eng
Tricho-Dento-Osseous syndrome is a rare autosomal dominant disorder. Immunosuppressive drugs, though critical to the treatment, have undesirable effects on patient's healing process. This is a case report of a 10-year-old female, suffering from Tricho-Dento-Osseous syndrome who was under treatment with penicillamine. As the dental treatment was sought too late, both central and lateral incisors on the right side of mandible had severe enamel hypoplasia and tooth necrosis was evident. A large lesion was found in anterior mandible. After proper treatment of the teeth with appropritately considering the systemic condition of the patient, the favorable result was achieved.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
6
v.
1
no.
2017
44
47
https://jdmt.mums.ac.ir/article_7375_b2248fe6cb4e4ee74dcf4920866efd13.pdf
dx.doi.org/10.22038/jdmt.2016.7375