فهرست مطالب

Journal of Dental Materials and Techniques
Volume:8 Issue: 2, Spring 2019

  • تاریخ انتشار: 1398/01/20
  • تعداد عناوین: 8
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  • Sedigheh Bakhtiari, Marziye Sehhatpour*, Mahin Bakhshi, Hassan Mir Mohammad Sadeghi, Saede Atarbashi, Moghadam Pages 53-58
    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
  • Sahand Samieirad, Rashid Soofizadeh*, Ahmad Shokouhifar, Vajiheh Mianbandi Pages 59-64

    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
  • Monika Dagdiya *, Ashok Pakhan, Anjali Bhoyar, Surekha Godbole, Seema Sathe Pages 65-72
    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
  • Elham Zajkani* Pages 73-78
     
    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
  • Mahrokh Imanimoghaddam, Shahrokh Nasseri, Mansoureh Darijani*, Ali Bagherpur, Azam Sadat Madani Pages 79-84
     
    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
  • Mugdha R Gharat*_Abhishek N Zingade_Renuka Metgud_Jyoti M Ajbani_Murtaza A Kaderi Pages 85-94
     
    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
  • Seyed Amir Mousavi, Ali Akhavan, Shirin Shahnaseri *, Fahimeh Razavi, Amirali Zahedinejad, Erfan Kolahdouzan Pages 95-100
     
    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
  • Adel Sharifi Rayeni, Sahand Samieirad *, Vajiheh Mianbandi, Nasrollah Saghravanian, Elaheh Tohidi Pages 101-106
    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