Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301An Overview of Computer Aided Design/Computer Aided Manufacturing (CAD/CAM) in Restorative Dentistry110995910.22038/jdmt.2017.26351.1213ENAdil AbdullahStomatology Research Center, School of Stomatology, China Medical University, Shenyang, Liaoning Province, P.R. ChinaFenik MuhammedOrthodontics Department, School of Stomatology, China Medical University, Shenyang, Liaoning Province, P.R. ChinaBowen ZhengOrthodontics Department, School of Stomatology, China Medical University, Shenyang, Liaoning Province, P.R. ChinaYi LiuOrthodontics Department, School of Stomatology, China Medical University, Shenyang, Liaoning Province, P.R. China0000-0002-4640-3396Journal Article20170916<strong>Objective: </strong>To review the current knowledge of CAD/CAM in dentistry and its development in the mentioned field.<strong> Sources: </strong>An electronic search was conducted across Ovid Medline, complemented by manual search across individual databases, such as Cochrane, Medline and ISI Web of Science databases and Google Scholar for literature analysis on the mentioned topic. The studies were reviewed thoroughly. This paper summarizes the current scientific and clinical opinions through a brief overview regarding the preferred way of utilizing CAD/CAM in dentistry. <strong> Conclusions: </strong>The importance of CAD/CAM systems has seen a dramatic development in the number of products and procedures over last decades, with a concomitant rise in publications on the topic. Literature suggests that using this technology permits carrying out dental treatments feasibly particularly for fixed dental appliances. Based on the previous findings, it is concluded that in office CAD/CAM technique appears to be the most common technique currently available, which is rapid, easy and keeps time. CAD/CAM systems are variable; therefore, using the right system with a logical approach for treating patients are quite mandatory.Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Evaluation of Diode laser (940 nm) irradiation effect on microleakage in class V composite restoration before and after adhesive application11181002110.22038/jdmt.2018.10021ENLoghman RezaeiAssistant Professor, Department of Operative Dentistry, School of Dentistry, Hamadan University of Medical Sciences, Iran0000-0001-0000-0000Shahin KasraeiDepartment of Restorative Dentistry, Dental School, Shahid Beheshti University of Medical Sciences, Tehran, IranReza FekrazadLaser Research Center in Medical Sciences, AJA University of Medical Sciences, Tehran, IranFarshid VahdatiniaLaser Research Center, Dental School, Hamadan University of Medical Sciences, Hamadan, IranAbbas Moghim BeigiDepartment of Biostatistics, School of Health, Hamadan University of Medical Sciences, Hamadan, IranMehdi HaddadPrivate dentist, Neyshabur, IranMarjan MalekiDepartment of Restorative Dentistry, Dental School, Hamadan University of Medical Sciences, Hamadan, IranJournal Article20171106<strong>Introduction:</strong> Nowadays, the main focus of dental studies is on adhesive dental materials; since clinical long-term success of bonded restorations depended more on marginal microleakage minimization. So, the aim of this study was Evaluation of Diode laser irradiation effect on microleakage in class V composite restoration before and after adhesive application. <strong>Materials and methods:</strong> In this in vitro-experimental study, standard class V cavity was prepared on lingual and buccal surfaces of 60 premolar teeth. For evaluation of microleakage, 60 teeth were divided randomly into four groups A, B, C, D (n=15): <br /> A) primer + adhesive (Clearfil TM SE Bond), B) primer + Diode laser + adhesive (940nm wave-length, 21J total energy, 0.7W power, 30s irradiation time) C) primer + adhesive + Diode laser D) primer + Diode laser + adhesive + Diode laser. Then, restoration was completed by Z250 composite. For data analyzing, we used SPSS 16 software. For statistical analysis, we used Non-parametric Kruskal-Wallis & Mann-Whitney tests at 0.05% significance level. <strong> Results:</strong> According to non-parametric Kruskal-Wallis test, microleakage scores had not significant difference before and after laser irradiation on gingival margins (p=0.116). But, in occlusal margins the results were significant among the groups (p=0.015). Also according to non-parametric Mann-Whitney tests among the occlusal microleakage scores, group B and D (Diode laser irradiation after primer and Diode laser irradiation after primer and adhesive) showed significant results. <strong>Conclusion:</strong> This study findings showed that in 6th generation adhesives, Diode laser irradiation on self-etch primer before bonding have significant effect on reduction of occlusal marginal microleakage in class V cavities although there was no significant positive effect of Diode laser on gingival margins.<br /> <br /> Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Shear Bond Strength of Acrylic Denture Teeth to PMMA and Polyamide Denture Base Materials19241000310.22038/jdmt.2017.10003ENMohammadreza NakhaeiAssociate Professor, Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.Hossein DashtiAssistant Professor, Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, IranReza BarazandehDDS, Mashhad, IranNafiseh TeimouriPostgraduate student , Department of Prosthodontics, School of Dentistry, Mashhad University of Medical Sciences, Mashhad, Iran.Journal Article20170917<strong>Introduction:</strong> Detachment of denture teeth from denture base is one of the most common reasons for costly denture repairs .This study aimed at evaluating the bond strength of an acrylic denture tooth to polyamide injection-molded thermoplastic denture base material compared with three conventional polymethylmethacrylate (PMMA) denture base resins.<br /> <strong>Materials and Method: </strong>A total of 40 acrylic denture molar teeth were randomly allocated into four groups (n=10) of heat-polymerized (HP), Auto-polymerized (AP), Injection molded (IM) and Polyamide thermoplastic (PT). All denture base/acrylic teeth combinations underwent 5000 thermal cycles (5-55<sup>◦</sup>C).Samples were subjected to shear bond strength test by a universal testing machine with a 1 mm/min crosshead speed .Data were analyzed using ANOVA and Tukey’s tests(α=0.05). <strong>Results: </strong>Mean ±SD of shear bond strength values were (MPa) 4.82±1.21, 4.52±1.67, 3.7±0.84 and 4.13±2.21 for groups HP, AP, IM and PT respectively. No significant difference was found among the experimental groups (<em>P</em>=0.429).<strong> Conclusion: </strong>Polyamide thermoplastic denture base resin was similar to conventional PMMA denture base materials in terms of bond strength to artificial denture teeth.<br /> <br /> Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Evaluation of Surface Characteristic Changes of WaveOne Gold and WaveOne Single Reciprocating Files Using Scanning Electron Microscopy: An in-vitro Study25321000410.22038/jdmt.2017.10004ENAhmed MenecyBDS, Department of Conservative Dentistry, Alexandria University, EgyptNayera MokhlessPhD, Professor of Endodontics, Department of Conservative Dentistry,Alexandria University, gyptSeham HanafyPhD, Professor of Biomaterials, Department of Dental Biomaterials, Alexandria University, EgyptJournal Article20170912<strong>Introduction:</strong> The purpose of this study was to evaluate surface topography of WaveOne Gold (WOG) and WaveOne (WO) files using SEM before and after use. <strong>Methods:</strong> Twelve primary files from each system were scanned for surface defects before instrumentation at 100x and 750x. Each file was planned ti be used to instrument six root canals and then examined under SEM after preparing one, three and six canals at same magnifications. Data were scored and statistically analyzed using Mann Whitney and Friedman tests<br /> (<em>p≤ 0.05)</em>. <strong>Results:</strong> Surface defects were detected in both study groups with higher values in WOG group before use. Surface defects significantly increased in both WO and WOG groups after use. WOG group showed significantly greater defects including metal strips, pitting, craters, micro-cracks and blunt edges (<em>p≤ 0.05</em>). <strong>Conclusion:</strong> WaveOne Gold file has a different metallurgy due to it’s gold finish that does not enhance it’s resistance to surface defects during clinical use.
Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301The Effect of Storage Environment on Dimensional Changes of Acrylic Resin Post Patterns33381002210.22038/jdmt.2017.10022ENAbbas FallahtaftiAssociate Professor, Department of Prosthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, IranMohamad Hossein LotfikamranAssociate Professor, Department of Prosthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, IranSeyyed Mohammad AbrishamAssociate Professor, Department of Prosthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran0000-0001-8136-9456Reza FallahtaftiDentistry student, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, IranMojtaba AminiDentist, Yazd,IranMohammad Reza Hakimi MeibodiPost Graduated Student, Department of Prosthodontics, School of Dentistry, Shahid Sadoughi University of Medical Sciences, Yazd, Iran0000-0002-9902-0321Journal Article20171003<strong>Introduction:</strong> The purpose of this study was to compare dimensional changes of two types of auto polymerizing acrylic resin patterns (APARPs) in three different storing environments.<strong> Methods:</strong> 60 acrylic post and core patterns were made of two types of Duralay acrylic resins (Aria dent, Iran and Reliance, Dental Mfg. Co, USA) using a canine model. Then coronal, apical diameter and coronoapical length of patterns were measured. Afterwards, they were divided into two categories of 30 for each type of Duralay acrylic resin type. Each category was divided into three groups of ten randomly to immerse in three storage environments (Deconex®53plus Borer ChemieAG, Switzerland), Unident ® Impre(USF Healthcare S.A, Sweitzerland) and water. After one hour, three mentioned values were measured again. Data were analyzed by SPSS20 using t-test, paired t-test and ANOVA.<strong> Results:</strong> Results showed that there were no statistically difference (p value> 0.05) about all dimensions of auto polymerizing acrylic post and core patterns except apical diameter and coronoapical length of Dental Mfg. Co, USA in Deconex®53 plus.<strong> Conclusion:</strong> The best environment to store Duralay APARPs with minimal changes was water and for disinfection, Deconex®53plus and Unident ® Imprecan showed acceptable properties with both of Duralay types.<br /> <strong> </strong><br /> Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Altering internal surface of putty impression material for better recording of tooth preparation margins39421002410.22038/jdmt.2018.10024ENRamin MosharrafDental Material Research Center, Department of Prosthodontics, School of Dentistry, Isfahan University of Medical Sciences, Isfahan, Iran.Journal Article20170913This article describes the clinical procedures for a modified putty-wash impression technique. In this method, the hydraulic pressure induced from planned flowing the wash material from the inner surface of putty impression toward the vestibules pull over the gingival tissues covering the finishing line. This simple method reduces the need to using retraction cord in normal depth finishing line in the gingival sulcus.Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Metastatic Tumors to Craniofacial Skeleton: Analysis of Two Cases and Review of the Literature43481002310.22038/jdmt.2018.10023ENMohsen DalbandAssociate Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Shahid Beheshti University of Medical Science, Tehran, IranShoaleh ShahidiProfessor, Biomaterial Research Center, Department of Oral and Maxillofacial Radiology, School of Dentistry, Shiraz University of Medical Sciences, Shiraz, IranMahdi GholamiOral & Maxillofacial Diseases Research Center, Mashhad University of Medical Science, Mashhad, IranAdell KhayatiAssistant Professor, Department of Oral and Maxillofacial Surgery, School of Dentistry, Kurdestan University of Medical Science, Sanandaj, IranJournal Article20171028Craniofacial skeletal metastasis is a rare presentation of advanced prostate cancer. This is a report of a <br /> 69-year-old man who presented with numbness of the right lower lip and recently ill-fitting lower denture. Based on the medical history of benign prostate hyperplasia (BPH) and suspicion of a metastatic tumor, prostate core needle biopsy was performed. Histology of the prostate biopsy confirmed an adenocarcinoma with Gleason Score of 6/10. The diagnosis of metastatic prostate adenocarcinoma was established by incisional biopsy from the mandibular lesion. Androgen deprivation therapy (ADT) was administered along with bilateral orchidectomy and radiotherapy. He had a significant resolution of trigeminal nerve palsy and the other symptoms at subsequent follow-ups, but after 18 months passed away. The second case was a 65-year-old man with a history of prostate cancer since 5 years ago. He complained of painful swelling in the right side of the face. Radiographic evaluation revealed new bone formation in right mandibular ramus and condylar process as well as the left temporoparietal region. Incisional biopsy from mandibular lesion revealed metastatic prostate adenocarcinoma. Palliative radiotherapy for increasing quality of life started for the patient but he died after 9 months. The related literatures were reviewed.<br /> <strong> </strong><br /> <br /> <strong> </strong>Mashhad University of Medical SciencesJournal of Dental Materials and Techniques2322-41507120180301Central Mandibular Nerve Sheath Myxoma49521002510.22038/jdmt.2018.10025ENNarges GhaziOral & Maxillofacial Diseases Research Center, Mashhad University of Medical Sciences, Mashhad, IranJahanshah SalehinejadDepartment of Oral and Maxillofacial Pathology, Mashhad Dental School, Mashhad, IranShapoor YaripourDepartment of Oral and Maxillofacial Surgery, Hamedan Dental School Hamedan, IranArash DehghanDepartment of General and Clinical Pathology, Hamedan University of Medical Science,
Hamedan, IranElham Baradaran NasseriDepartment of Medicine, Mashhad Dental School, Mashhad, IranMehdi ShahabinejadDepartment of Oral and Maxillofacial Pathology, Mashhad Dental School, Mashhad, Iran0000-0003-0016-1341Journal Article20171016Nerve sheath myxoma has been described as a rare neural tumor arising from Schwann cells. It is observed most frequently in the central area of the face, neck and upper extremities. In the past the term neurothekeoma was used as synonym for nerve sheath myxoma but according to new reports, they are separate entities which can be confirmed by immunohistochemistry as in our case. Oral involvement of this tumor is extremely rare. Here, we present an unusual case of nerve sheath myxoma in the mandible of a 22-year old female patient. This case appears to be the first myxomatous variant which is centrally located in the mandible.<br /> <br /> <br /> <strong> </strong>