The evaluation and comparison of marginal adaptation in metal ceramic and all ceramic restorations fabricated by two methods: CAD/CAM and conventional
Ahmad
Ghahremanloo
Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences,
Mashhad, Iran
author
Mohsen
Movahedzadeh
Dental Research Center, School of Dentistry, Mashhad University of Medical Sciences,
Mashhad, Iran
author
Abdollah
Javan Rashid
(M.Sc. of Biostatistics) Dental Schools, Mashhad University of Medical Sciences,
Mashhad, Iran
author
text
article
2018
eng
Introduction: Marginal fit is a key factor for long term clinical success through any dental restorations. Poor marginal adaptation causes cement dissolution. This can lead to dental caries, gingival irritation, periodontal diseases, and finally treatment failure. The aim of this study was measurement and comparison of marginal gap quantities in metal ceramic and all ceramic dental restorations fabricated by various methods. Methods & Materials: A total of 60 complete crowns in 6 groups (n=10) were fabricated as. Follows: Group A: Conventional metal-ceramic collarless restorations. Group B: Metal-ceramic collarless restorations with CAD/CAM wax copings and porcelain layering. Group C: Metal-ceramic collarless restorations with Ceramill Sintron metal copings and porcelain layering. Group D: All ceramic e-max. Press (lithium disilicate) restorations. Group E: All ceramic restorations with CAD/CAM zirconia copings and porcelain layering. Group F: All ceramic CAD/CAM translucent zirconia (Zolid). Replica technique and optical microscope (60 x magnifications) used to gap measurement. Mann whitney and kruskal-wallis tests used to analyze the data. Results: The lowest mean marginal gap seen in group C (29.12) and the highest mean marginal gap seen in group E(78.19)The mean marginal adaptation was better in metal ceramic restorations than all ceramic restorations and the difference was significant (P˂0.001). Conclusion: According to our study, marginal gap of metal ceramic and all ceramic restorations was clinically acceptable (less than 120 microns).
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
53
62
https://jdmt.mums.ac.ir/article_10501_4d4eceaaad5aa408ed60aabcd358b69e.pdf
dx.doi.org/10.22038/jdmt.2018.10501
Mishmash Impression Technique for Managing Maxillary Anterior Fibrous Ridge
Poonam
Kulkarni
Associate Professor, Department of Prosthodontics, Sri Aurobindo College of Dentistry, Indore, Madhya Pradesh, India
author
Rahul S.
Kulkarni
Private Practitioner, Kulkarni Dental Clinic, Madhya Pradesh, India
author
Rupal J.
Shah
Professor & Head, Department of Prosthodontics, Government Dental College & Hospital, Gujarat, India
author
Bharti
Tomar
Director, the Healers Dental Group, India
author
text
article
2018
eng
Introduction: Flabby or fibrous ridge is one of the consequences of long term wearing of complete dentures. It can develop where hyperplasic soft tissue replaces the alveolar bone and is a common finding, particularly in the upper anterior region of long term denture wearers. Forces exerted during impression making can result in distortion of the mobile tissue unless managed appropriately; such flabby ridges adversely affect support, retention and stability of complete dentures. Many impression techniques have been developed to help overcome this problem. While these vary in the method applied, they are similar in their complexity, are often quite time-consuming to perform and rely on materials not commonly used in contemporary general dental practice. The purpose of this article is to describe an impression technique for flabby ridges usingrubber base impression materials, routinely available in general dental practice.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
63
68
https://jdmt.mums.ac.ir/article_10517_c75133b57b18ce888f6037003f495895.pdf
dx.doi.org/10.22038/jdmt.2018.10517
Root Canal Transportation in Canals Joining together: Assessed by Cone-Beam Computed Tomography
Neda
Naghavi
Dental Material Research Center, Department of Endodontics, Faculty of Dentistry, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
author
Mina
Zarei
Dental Material Research Center, Department of Endodontics, Faculty of Dentistry, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran
author
Maryam
Gharechahi
Dental Research Center, Department of Endodontics, Faculty of Dentistry, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran.
author
Ali
Bagherpour
Dental Research Center, Department of Radiology, Faculty of Dentistry, Mashhad University of Medical Sciences (MUMS), Mashhad, Iran.
author
Zahra
Owsati
General practitioner, private practice
author
text
article
2018
eng
Introduction: Statement of the Problem: Cleaning and shaping are regarded as the most important aspects of root canal therapy and prerequisite for the success of endodontic treatment. Apical transportations can jeopardize the outcome of treatment due to the significant decrease in the sealing ability of root filling material. The purpose of this study was to evaluate transportation in type II canals with two preparation techniques. Materials and Method: Twenty lower first molars were selected and divided into 2 groups of 10. In the first group, the lingual canal of the mesial root was selected as the main canal and prepared up to the WL. The other canal (buccal) was prepared up to the juncture point. In the second group, both canals in the mesial root were prepared up to the working length. The amount and direction of canal transportation in each group were determined in five sections from 2 mm above the juncture point of the canals to 2 mm below the juncture point in 1-mm increments. Results: There were no significant differences between the two techniques in causing transportation in both buccolingual and mesiodistal directions in each increments (P>0.05). Conclusion: Both preparation techniques caused transportation in both mesiodistal and buccolingual directions.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
69
74
https://jdmt.mums.ac.ir/article_10503_31f9f8e38d7abefe0518c0ef4d38aa55.pdf
dx.doi.org/10.22038/jdmt.2018.10503
Evaluation of microbial contamination of mobile phones and computer mice and keyboards in a dental school
Taraneh
Movahhed
Assistant Professor of Pediatric Dentistry, Dental Materials Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
Mahboobe
Dehghani
Assistant Professor of Orthodontics, Dental Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
Tayyebeh
Ghoddusi
Student of dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2018
eng
Introduction: Mobile phones and computers are a reservoir of growth and transmission of microorganisms. This study aimed to evaluate the microbial contamination of computers and mobile phones used by students of an academic dental school, compared to the students of a non-medical school. Methods: Sampling was performed on 44 computers and 45 mobile phones in a dental school (test) and a non-medical school (control). Samples were obtained from the Enter and Backspace keys of keyboards, the left-click button of computer mice and touch-screen of mobile phones. Afterwards, the samples were cultured, followed by colony count. Results: The most frequently detected microbes were coagulase-negative Staphylococci, Bacillus and Micrococcus. In computer samples, pathogenic bacteria including Staphylococcus aureus and Klebsiella, were found only in the samples of the dental school. Staphylococcus aureus and Micrococcus were significantly more prevalent in the test group. Microorganisms belonging to human normal flora (e.g., Bacillus, Entrococcus, Corynebacterium, and Tetragenococcus) were significantly more prevalent in computers of the control group. In terms of the frequency of pathogenic bacteria found on mobile phones, no significant difference was observed between the study groups. Conclusion: The prevalence of normal human flora was higher in the control group (non-medical) relative to the test group (dental). Meanwhile, pathogenic bacteria were more prevalent in the samples of the dental school. Also, computers were more contaminated than mobile phones. Hygiene promotion programs should be implemented in both dental and non-medical schools.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
78
82
https://jdmt.mums.ac.ir/article_10515_b257bbfd69c3713b2627616187a6f133.pdf
dx.doi.org/10.22038/jdmt.2018.10515
Hepatitis B Virus Infection and Oral Lichen Planus: A Report from Northeast of Iran
Mohammad Amin
Khajavi
Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
Zahra
Meshkat
Antimicrobial Resistance Research Center, Mashhad University of Medical Sciences,
Mashhad, Iran
author
Alireza
Pasdar
Department of Modern Sciences and Technologies, Faculty of Medicine, Mashhad University of Medical Sciences, Mashhad, Iran
author
Ala
Ghazi
Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
Sina
Gerayli
Division of Applied Medicine, Medical School, University of Aberdeen,
Foresterhill, Aberdeen, UK
author
Elham
Banihashemi
Department of Biology, Western University, London, Ontario, N6A 5B7, Canada
author
Pegah
Mosannen Mozafari
Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2018
eng
Introduction: Lichen planus is a chronic inflammatory disease in oral mucosa and skin. Recently, reports have demonstrated a possible relationship between lichen planus and liver diseases. During the past decade, there has been a hypothesis regarding viral etiological agents that have been found to be in association with hepatotrophic viruses known as Hepatitis B and C with LP. This research was studied in Mashhad, northeast of Iran, to find a relationship between OLP and HBV infection. Methods: Age and gender of 134 patients (with OLP) and 134 controls (without OLP) were not matched and their serum samples were respectively screened for HBsAg by ELISA (third generation) and polymerase chain reaction (PCR) for HBV-DNA. Results: Tests were positive (for both HBsAg and HBV-DNA) for 9 patients (6.71%) with OLP and 2 healthy individuals (1.49%) infected with HBV (P=0.03). Conclusion: There was a relationship between HBV and OLP in our population. Based on our findings, it is recommended that viral serology for Hepatitis B and OLP patients be conducted as a routine screening process.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
83
88
https://jdmt.mums.ac.ir/article_10508_0e4b787fb9fc7a96e7bb0dba93ed7313.pdf
dx.doi.org/10.22038/jdmt.2018.10508
Common Positioning Errors in Digital Panoramic Radiographies Taken In Mashhad Dental School
Ali
Bagherpour
Department of Oral and Maxillofacial Radiology, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
author
Iman
Moshtagh-Khorasani
Private Dental Practice, Mashhad, Iran
author
Atie
Safaee
Department of Oral and Maxillofacial Radiology, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran
Oral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
author
text
article
2018
eng
Introduction: The present study was aimed at evaluating common positioning errors on panoramic radiographs taken in the Radiology Department of Mashhad Dental School. Materials and methods: The study sample included 1,990 digital panoramic radiographs taken in the Radiology Department of Mashhad Dental School by a Planmeca Promax (Planmeca Oy, Helsinki, Finland), during a 2-year period (2010–2012). All radiographs, according to dentition and sex, were evaluated for positioning errors. Results: There were 1,927 (96.8%) panoramic radiographs with one or more errors. While the number of errors in each image varied between one and five, most images had one error (48.4%). The most common error was that the tongue was not in contact with the hard palate (94.8%). "Open lips" was an error not seen in any patients. Conclusions:positioning errors are common in panoramic radiographies. The most common error observed in this study was a failure to place the tongue on the palate. This error and the other errors reported in this study can be reduced by training the technicians and spending little more time for patient positioning and more effective communication with the patients.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
89
96
https://jdmt.mums.ac.ir/article_10510_26079ea82486c5f010ffe31151ffb0e6.pdf
dx.doi.org/10.22038/jdmt.2018.10510
Asymptomatic Osteoblastoma of the Mandible: A Rare Case Report
Soudabeh
Sargolzaei
Department of Oral and Maxillofacial Pathology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Saede
Atarbashi-Moghadam
Department of Oral and Maxillofacial Pathology, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
Fatemeh
Latifi
Department of Oral and Maxillofacial Surgery, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, Iran
author
text
article
2018
eng
Osteoblastoma is a rare solitary osteoblastic bone neoplasm. It is characterized by proliferation of osteoblasts forming trabeculae within a vascular fibrous stroma. There is a variety of jaw bone lesions with very close clinical, radiological and microscopic interrelations, which make diagnosis more challenging. Familiarity with these rare bony lesions is vital for oral pathologists. This report presents a new case of asymptomatic mandibular osteoblastoma occurring in a 43-year-old male
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
97
100
https://jdmt.mums.ac.ir/article_10502_af456b3a393934abe0388dae834af61f.pdf
dx.doi.org/10.22038/jdmt.2018.10502
Sebaceous Carcinoma of Inner Canthus of the Eye: Report of a Case
Nooshin
Mohtasham
Professor of Oral and Maxillofacial Pathology, Mashhad Dental School, Mashhad, Iran
Oral & Maxillofacial Diseases Research Center, Mashhad Univesity of Medical sciences, Mashhad, iran
author
Arash
Dehghan
Assistant Professor of General and Clinical Pathology Hamedan University of Medical Science, Hamedan, Iran
author
Mahdi
Gholami
Assistan Professor of Oral and Maxillofacial Surgery, Mashhad Dental School, Mashhad, Iran
5Oral & Maxillofacial Diseases Research Center, Mashhad Univesity of Medical sciences, Mashhad, iran
author
Mehdi
Shahabinejad
Assistan Professor of Oral and Maxillofacial Pathology, Mashhad Dental School, Mashhad, Iran
5Oral & Maxillofacial Diseases Research Center, Mashhad Univesity of Medical sciences, Mashhad, iran
author
text
article
2018
eng
Introduction: This is to report a rare case of sebaceous carcinoma of inner cantus of the eye in relation with rare skin lesions of epidermodysplasia verruciformis. Epidermodysplasia verruciformis is a rare skin disease which is caused by human papilloma virus. Sebaceous carcinoma is a rare entity which is derived from sebaceous glands and to our best knowledge this is for the first time that we observe sebaceous carcinoma arising from lesions of epidermodysplasia verruciformis at the inner canthus of the eye. We report a 50 years old male patient who admitted to our hospital 3 years ago.
Journal of Dental Materials and Techniques
Mashhad University of Medical Sciences
2322-4150
7
v.
2
no.
2018
101
104
https://jdmt.mums.ac.ir/article_10512_eb33bb8e8c05b956d002659936f894b9.pdf
dx.doi.org/10.22038/jdmt.2018.10512