@article { author = {Bakhtiari, Sedigheh and Sehhatpour, Marziye and Bakhshi, Mahin and Mir Mohammad Sadeghi, Hassan and Atarbashi-Moghadam, Saede}, title = {Removal of a Massive Pleomorphic Adenoma on the Palate Using Subtotal Maxillectomy: A Report of a Rare Case and Literature Review}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {53-58}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12372}, abstract = {Pleomorphic adenoma is the most prevalent salivary tumor, 65% of which occur in major glands. This tumor varies in terms of size depending on the gland where it is located. The most common sites of the minor salivary glands are the palate, lips, cheeks, and throat. Palatal pleomorphic adenoma is laterally located, rarely crossing the midline. This tumor is painless with slow growth rate, which often appears in the fourth or fifth decade of life with female predominance. The tumor may enlarge with delayed treatment. This study aimed to present the case of a 51-year-old woman with an oversized mass on the palate (diameters: 8.5x5.5x2.5 cm), which extended from the anterior portion of the hard palate to the soft palate with a slow growth rate within 10 years. The case definition was accompanied by the determined surgical treatment.    }, keywords = {Pleomorphic adenoma,Massive,Palate,Surgical Procedure}, url = {https://jdmt.mums.ac.ir/article_12372.html}, eprint = {https://jdmt.mums.ac.ir/article_12372_dbfb20afac7c13a6565ceb3e2363f393.pdf} } @article { author = {Samieirad, Sahand and Soofizadeh, Rashid and Shokouhifar, Ahmad and Mianbandi, Vajiheh}, title = {A Two-step Method for the Preparation of Implant Recipient Site in Severe Atrophic Maxilla: A Case Report of the Alveolar Ridge Split Technique Followed by Bone Expansion}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {59-64}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2018.12378}, abstract = {Augmentation of deficient and atrophic alveolar ridges is an important aspect of dental implant therapy with the goal of providing a functional restoration in harmony with adjacent natural dentition. Bone splitting technique is considered a distinguished augmentation method for treatment of deficient alveolar ridges. According to this procedure, the compromised alveolar ridge is opened from the crest of the ridge and subsequently split with special chisel instruments. In this report, we described a case of horizontal ridge augmentation of an atrophic anterior maxillary ridge using ridge split in the first step and ridge expansion concomitant with implant placement in the second stage after 6 months. A two-step method of alveolar ridge split using piezosurgery followed by bone expansion is a reliable and successful treatment plan for implant recipient site rehabilitation in severe atrophic maxilla (less than 3 mm).    }, keywords = {Alveolar ridge split,atrophic alveolar ridge,bone expansion}, url = {https://jdmt.mums.ac.ir/article_12378.html}, eprint = {https://jdmt.mums.ac.ir/article_12378_ee038d237dc93ffae12114dbc56f8cf8.pdf} } @article { author = {Dagdiya, Monika and Pakhan, Ashok and Bhoyar, Anjali and Godbole, Surekha and Sathe, Seema}, title = {Comparative Evaluation of the Flexural Strength of Heat Polymerized Acrylic Resin with the Addition of 8% and 13% Aluminum Oxide Powder: An In-vitro Study}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {65-72}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12585}, abstract = {Introduction: Acrylic resins have been used successfully as denture bases. However, acrylic resin denture base materials are brittle and have poor strength and thermal conductivity. Therefore, it is essential to improve the flexural strength of heat polymerized acrylic resin. The present study aimed to evaluate and compare the flexural strength of heated polymerized acrylic resin with the addition of 8% and 13% aluminum oxide powder. Methods: In total, 90 acrylic specimens were fabricated and divided into three groups of A1 (unmodified heat-cured denture base resin), A2 and A3 (heat-cured denture base resin polymer modified with 8% and 13% by weight of aluminum oxide powder, respectively). The specimens were stored in distilled water for one week, and flexural strength was assessed using a universal testing machine. Data analysis was performed using one-way analysis of variance (ANOVA).  Results: Comparison of groups A1 and A2 (8%) showed the highest flexural strength (85.94 MPa) in group A2. A significant increase was observed in the values of flexural strength with 13% alumina addition. Comparison of groups A1 and A3 (13%) showed the highest flexural strength (86.41 MPa) in group A3, and the difference in the mean values of flexural strength was considered significant. Moreover, comparison of groups A2 and A3 indicated the highest flexural strength in group A3. Conclusion: Addition of alumina to conventional heat-cured acrylic resin shows increase in flexural strength. Increasing the flexural strength of acrylic resin base materials could results in higher clinical success rate.    }, keywords = {Conventional Heat-cured Denture Base Resins,Flexural strength,Aluminum Oxide Powder,Polymethyl Methacrylate}, url = {https://jdmt.mums.ac.ir/article_12585.html}, eprint = {https://jdmt.mums.ac.ir/article_12585_85b4dada4cd8b73aadd5f4ccecf5ceb0.pdf} } @article { author = {Zajkani, Elham}, title = {Effects of 0.2% Chlorhexidine and Re-polishing on the Color Stability of Nanofilled Composite Resins}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {73-78}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12520}, abstract = {Introduction: The growing demand for esthetic dental procedures has resulted in the increased development of new restorative composite resins. The success of composite resin restorations depends on their color stability over time. The present study aimed to evaluate the effects of 0.2% chlorhexidine (CHX) and re-polishing on the color stability of nanofilled composite resins. Methods: This interventional, in-vitro study was conducted on 48 disk-shaped samples (diameters: 8×2 mm), which were prepared using Z350 (3M ESPE, USA) and Grandio (VOCO, Germany) A2 shade composite resins. The samples were divided into four groups of 12 and immersed in CHX and distilled water for 14 days. Colorimetry of the samples was performed before and after immersion in the solutions and after re-polishing using a spectrophotometer. Data analysis was performed using the analysis of variance (ANOVA) and Tukey’s test at the significance level of α=0.05. Results: All the composite resin samples exhibited discoloration (ΔE1<3.3), and a significant difference was observed in discoloration with CHX between the two composite resins (P<0.05), with greater discoloration in the Grandio composite resin (ΔE1=2.041). In addition, the color changes of the samples were considered significant between water and CHX (P<0.05), and a distinct color change was denoted in the samples after re-polishing. Conclusion: According to the results, the color changes in the composite resins were a function of the type of the composite resin and solution used for immersion.    }, keywords = {Chlorhexidine,Dental Polishing,Composite Resin,Spectrophotometry}, url = {https://jdmt.mums.ac.ir/article_12520.html}, eprint = {https://jdmt.mums.ac.ir/article_12520_953abb5769e75a6fc4805e2c0e55cba4.pdf} } @article { author = {Imanimoghaddam, Mahrokh and Nasseri, Shahrokh and Darijani, Mansoureh and Bagherpur, Ali and Madani, Azam Sadat}, title = {The Prevalence of Partial Changes in the Condylar Head in the Patients with Osteoarthritis: A Cone Beam Computed Tomography (CBCT) Study}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {79-84}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12523}, abstract = {Abstract Introduction: The present study aimed to review the condylar changes in the patients with osteoarthritis using cone beam computed tomography (CBCT) images. Methods: In this study, 80 CBCT images of the temporomandibular joint (TMJ) pertaining 20 patients with osteoarthritis and 20 healthy individuals were evaluated, as well as the CBCT images that were obtained for other reasons. The images were reviewed in the coronal and sagittal sections. Considering the higher prevalence of osteoarthritis in women and after eliminating gender-based interventions, all the female patients were enrolled in the study. Chi-square was used to evaluate the correlations between the changes in the condylar head by the grouping of the patients, and the significance level was considered at 0.05. Results: The correlation of condylar head flattening (P=0.051) and Ely’s cysts (P=0.544) was assessed in the control group and osteoarthritis patients, and no significant difference was observed between the two variables and patient classification. In addition, the association between erosion (P<0.001) and osteophyte (P=0.002) of the condylar head was evaluated in the control group and osteoarthritis patients, and the presence or absence of these conditions had a significant correlation with disease grouping. Conclusion: According to the results, the presence of osteophyte and erosion was more significant in the osteoarthritis group compared to the healthy subjects. The most prevalent bony changes in the condylar head were due to flattening, and the less prevalent changes were associated with Ely’s cysts. Moreover, osteophyte and erosion were more prevalent in the patients with osteoarthritis.    }, keywords = {TMJ,CBCT,Osteoarthritis,Partial Changes,Osteophyte}, url = {https://jdmt.mums.ac.ir/article_12523.html}, eprint = {https://jdmt.mums.ac.ir/article_12523_ec254ead9728ba90ddbdb3714a741ac7.pdf} } @article { author = {Gharat, Mugdha R and Zingade, Abhishek N and Metgud, Renuka and Ajbani, Jyoti M and Kaderi, Murtaza A}, title = {Treatment of Gingival Recession Associated with Non-Carious Cervical Lesions Using Resin Modified Glass Ionomer Cement with Connective Tissue Graft a Randomized Controlled Clinical Trial}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {85-94}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12536}, abstract = {Introduction: Gingival recession (GR) is a common aesthetic problem associated with the cervical wear of the tooth structure and dentin hypersensitivity. Recently, periodontal-restorative approaches have been proposed for the management of GR associated with non-carious cervical lesions (NCCLs), which has proven effective. The present study aimed to evaluate this method.  Methods: In total, 30 subjects with isolated Millers class I GR associated with NCCL in the maxillary canines and premolars were randomly assigned to group A (CTG) and group B (R+CTG). Clinical parameters, including the probing pocket depth (PPD), relative GR (RGR), keratinized tissue width (KTW), keratinized tissue thickness (KTT), relative clinical attachment level (CAL), cervical lesion height (CLH), and dentin hypersensitivity (DH), were recorded at baseline (BL) and after one and six months. In addition, maximum root coverage (MRC) was evaluated after six months.  Results: In both groups, a statistically significant reduction was observed in the PPD, RGR, and CLH after six months (P=0.001). On the other hand, a significant increase was observed in the KTW, KTT, and CAL in both groups (P=0.001). Moreover, the visual analogue pain scores indicated a significant reduction in both groups, while the reduction was considered more significant in group B (P˂0.05) compared to group A. In groups A and B, 69.24% and 61.54% of the sites showed MRC, respectively. Conclusion: According to the results, both groups achieved comparable root coverage, while the presence of restoration led to a greater reduction in dentin hypersensitivity.    }, keywords = {gingival recession,Resin-modified Cement,Connective tissue graft}, url = {https://jdmt.mums.ac.ir/article_12536.html}, eprint = {https://jdmt.mums.ac.ir/article_12536_61b2a9342257da15a9f7d05eae541d77.pdf} } @article { author = {Mousavi, Seyed Amir and Akhavan, Ali and Shahnaseri, Shirin and Razavi, Fahimeh and Zahedinejad, Amirali and Kolahdouzan, Erfan}, title = {In-vitro Evaluation of Microleakage in Root Canal Obturation with Mineral Trioxide Aggregate and Calcium-enriched Mixture Cement Using Fluid Filtration}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {95-100}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12379}, abstract = {Introduction: Endodontic treatment failure is caused by the leakage of microorganisms and endotoxins, which leads to pathological lesions. Adequate seal of the root canal is essential to preventing recontamination and ensuring the long-term clinical success rate. Mineral trioxide aggregate (MTA) and calcium-enriched mixture cement (CEM) are common types of cement with adequate sealing capability in endodontics. The present study aimed to compare the microleakage in the root canals filled with ProRoot MTA and CEM cement using fluid filtration. Methods: This experimental, in-vitro study was conducted on 46 root canals of extracted mandibular premolars. After preparation and disinfection with 3% sodium hypochlorite, the crowns were resected from the cervical region. The teeth were randomly divided into two experimental groups of 20 based on the tested materials (ProRoot MTA and CEM cement), as well as two negative and positive control groups of three. All the samples were instrumented and obturated using the step-back technique, and fluid filtration was used to evaluate sealing ability and leakage inhibition. Data analysis was performed using the Mann-Whitney U test (α=0.05). Results: Mean microleakage in the ProRoot MTA and CEM cement was 2±0.79 and 3.02±1.38 µL/8 min, respectively. In addition, a significant difference was observed between the two groups in this regard (P<0.011).Conclusion: According to the results, ProRoot MTA provided significantly less microleakage compared to the CEM cement. Therefore, the sealing ability of ProRoot MTA was higher than the CEM cement, which makes MTA a better material than CEM cement for canal obturation.    }, keywords = {Calcium-enriched Mixture,fluid filtration,mineral trioxide aggregate}, url = {https://jdmt.mums.ac.ir/article_12379.html}, eprint = {https://jdmt.mums.ac.ir/article_12379_642ce42aa783475224d69d05221a4f9e.pdf} } @article { author = {Sharifi Rayeni, Adel and Samieirad, Sahand and Mianbandi, Vajiheh and Saghravanian, Nasrollah and Tohidi, Elaheh}, title = {A Rare Case of Maxillary Compound Odontoma with an Unusual Large Number of Denticles}, journal = {Journal of Dental Materials and Techniques}, volume = {8}, number = {2}, pages = {101-106}, year = {2019}, publisher = {Mashhad University of Medical Sciences}, issn = {2322-4150}, eissn = {2252-0317}, doi = {10.22038/jdmt.2019.12561}, abstract = {Odontoma is the most frequent odontogenic gnathic tumor, which is considered to be a hamartomatous lesion rather than an actual odontogenic tumor. Odontoma is basically composed of enamel and dentin, while it could also have various contents of cementum and pulp tissue. These lesions may manifest in two specific forms, including the compound type with multiple, small, tooth-like structures and the complex form with amorphous calcified masses. The early detection, management, and surgical enucleation of odontomas are recommended to prevent tooth eruption disturbances and further pathological complications. The present study aimed to describe a rare case of compound odontoma in the anterior maxilla with an unusually high number of denticles in a 19-year-old Iranian female patient. 62 denticles were extracted presenting a unique case of odontoma, compared to the previously reported subjects with less number of denticles. In addition, the clinical, radiographic, and histopathological aspects, as well as the other possible systemic disorders and selected management approach, were discussed.     }, keywords = {compound odontoma,maxilla,Denticles}, url = {https://jdmt.mums.ac.ir/article_12561.html}, eprint = {https://jdmt.mums.ac.ir/article_12561_63d56c9146c025967324968c27fdae27.pdf} }