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RISS 인기검색어
- 검색키워드
- 저자 : Hamidreza Moslemi (검색결과 3 건)
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Moslemi-firoozabadi Hamidreza,Manafi Sahebali,Ghahremani Davoud 한국세라믹학회 2022 한국세라믹학회지 Vol.59 No.6
This study focused on the production of mullite ceramic and composites containing HfN reinforcements through spark plasma sintering. Accordingly, 5, 10 and 15wt% HfN powders with calcined Aluminum nitrate nonahydrate (ANN) and colloidal silica mixture were blended through a high-energy mixer mill in ethanol media. Spark plasma sintering of mullite ceramic and composite was performed under almost the same condition consisting of the initial and fi nal applied pressure of 10 and 50 MPa, respectively, vacuum of 15–25 Pa, and the maximum sintering temperature of 1350 °C. The measured relative den- sities showed the nearly full densifi cation of all prepared samples. The XRD patterns also depicted perfect mullitization for the mullite sample, while in the sintered composites, mullite, HfN and HfO 2 peaks were obtained as the crystalline phases. The uniform distribution of HfN and HfO 2 as the reaction products of ANN water desorption was recognized in the micro- structure of mullite composites with 5 and 10 wt% HfN samples. Meanwhile, the mullite-15wt% HfN composite displayed some agglomerates and porosities. The attained mechanical properties also showed that Vickers hardness was increased by raising HfN contents. However, the maximum bending strength of 424 ± 25 and fracture toughness of 3.74 ± 0.22 MPa m 1/2 were achieved for the composite containing 10 wt% HfN.
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Reza Tabrizi,Arash Sarrafzadeh,Shervin Shafiei,Hamidreza Moslemi,Ramtin Dastgir 대한악안면성형재건외과학회 2022 Maxillofacial Plastic Reconstructive Surgery Vol.44 No.-
Background: The stability of the results remains a significant concern in orthognathic surgeries. This study aimed to assess the amount of relapse following mandibular advancement with/without maxillomandibular fixation (MMF). Materials and methods: A single-blind clinical trial was conducted on patients with mandibular retrognathism who underwent BSSO for mandibular advancement and Lefort I maxillary superior repositioning. Patients were randomly divided into two groups of treatment (MMF) and control (no MMF). In the treatment group, MMF was performed for 2 weeks; meanwhile, MMF was not performed in the control group, and only guiding elastics were applied postoperatively. Lateral cephalograms were obtained preoperatively (T1), immediately after surgery (T2), and at 1 year postoperatively (T3). The distance from points A and B to the X and Y plane were measured to identify the amount of vertical and horizontal relapse in 1 year as a primary outcome. An independent t-test was applied in order to find differences in outcomes between the control and treatment groups. Results: Fifty-eight patients were evaluated in two groups (28 patients in the MMF group and 30 in the no-MMF group). The magnitude of mandibular advancement following BSSO was 7.68±1.39 mm and 7.53±1.28, respectively, without significant difference among the groups (p= 0.68). The mean sagittal and vertical changes (relapse) at point B were significantly different between the two groups at 1-year follow-up after the osteotomy (p=0.001 and p=0.05, respectively). Conclusion: According to the results of this study, patients with short-term MMF following BSSO for mandibular advancement benefit from significantly greater skeletal stability in the sagittal and vertical dimensions.
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Elahe Tahmasebi,Elham Keykha,Samira Hajisadeghi,Hamidreza Moslemi,Shervin Shafiei,Mohammad Hosein Kalantar Motamedi,Arman Torabizadeh,Reza Tabrizi,Mostafa Alam 대한악안면성형재건외과학회 2023 Maxillofacial Plastic Reconstructive Surgery Vol.45 No.-
Background This systematic review and meta-analysis aimed to evaluate the factors influencing and success rates of dental implants for functional and dental rehabilitation following microvascular fibula flap reconstruction in the maxillomandibular region. Main text We conducted a comprehensive search of electronic databases, including MEDLINE, Web of Science, Embase, Scopus, and Cochrane’s CENTRAL, as well as gray literature sources and manual searches of notable journals. The search was performed from inception until February 2023. Studies were included if they examined functional and dental rehabilitation outcomes in patients receiving maxillofacial reconstruction using microvascular fibula flaps and were retrospective or prospective cohort studies involving human subjects. Case–control studies, research involving other reconstruction methods, and animal-based studies were excluded. Data was extracted and confirmed by two independent researchers, and risk of bias was assessed using the Newcastle–Ottawa Scale. Meta-analyses were conducted for dental implant and graft success rate, with separate analyses for different factors affecting the outcome. Heterogeneity was evaluated using Cochran’s Q test and the I2 test. The pooled success rate for implants was 92% and for grafts, 95%, with significant heterogeneity. Implants in fibular grafts had a 2.91 times higher failure rate than those in natural bones. Radiated bone and smoking were identified as factors influencing implant failure, with radiated bone having a 2.29 times higher risk and smokers having a 3.16 times higher risk compared to their respective counterparts. Patient-reported outcomes showed improvements in key areas such as dietary intake, mastication, speech, and esthetics. The success rates declined over time, emphasizing the importance of long-term follow-up. Conclusions Dental implants in free fibula grafts generally have favorable success rates, with minimal bone resorption, manageable probing depths, and limited bleeding on probing. Implant success is influenced by factors such as smoking and radiated bone.
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