Comparison of Mastication Status in Ameloblastoma Patients Post-Mandibular Segmental Resection Operation with LC Type with Mandibular Reconstruction using Plate And Plate Bone Graft in RSUD Dr. Soetomo

Background: Mandibular resection is part of the surgical operation for ameloblastoma cases, followed by mandibular reconstruction. Good masticatory status should be taken into account in determining the success of mandibular reconstruction. To assess mastication, some measuring instruments in the form of a questionnaire were created, one of which is the Tsuga questionnaire. At RSUD Dr. Soetomo Surabaya, the most common resection performed is mandibular segmental resection with an LC type defect, where an assessment of mastication status had not been carried out in this case. Methods: This study is an analytic study to see the mastication status of patients after mandibular resection and reconstruction with a case-control study design. This study used primary data in the form of interviews and secondary data in the form of medical records of ameloblastoma patients who had undergone mandibular resection surgery with an LC type defect and underwent mandibular reconstruction at RSUD Dr. Soetomo Surabaya. Results: The total research subjects were 50 people, consisting of 26 men (52%) and 24 women (48%). From the results of the study, there was no statistically significant relationship between the age group and mastication status after mandibular reconstruction (p-value = 0.765) and also between gender and mastication status after mandibular reconstruction (p-value = 0.725). Meanwhile, between the type of reconstruction and mastication status, there was a statistically significant relationship (p-value = 0.011). It was also found that patients with the type of reconstruction using a plate bone graft had five times better mastication status than those who used the type of reconstruction using a plate. Conclusion: There is a statistically significant relationship between the type of reconstruction and mastication status. Mandibular reconstruction in postoperative ameloblastoma patients with mandibular segmental resection with LC type defects using plate bone graft has a better mastication status than those using plates without bone graft. Keywords: masticatory status, ameloblastoma, mandibular resection, mandibular reconstruction.

Evolution of Defects in CVD-W Irradiated by H/He Neutral Beam Using Positron Annihilation Spectroscopy

One of the key problems for the application of nuclear fusion energy is to select the suitable plasma facing materials (PFMs). Among the W-based materials, CVD-W exhibits some unique advantages. In order to estimate the performance of CVD-W under the fusion environment, the vacancy-type defects and their evolution are investigated by the Doppler-broadening slow positron beam analysis (DB-SPBA) combined with SEM (scanning electron microscope). There are two kinds of neutral beam irradiation, the pure H neutral beam and the H + 6 at.% He neutral beam irradiation, which are performed at the neutral beam facility GLADIS (IPP, Germany). The surface temperatures of CVD-W irradiated by H (H + 6 at.% He) are 850 and 1000 (700 and 800 °C). By comparing the samples under different conditions, the defect evolution of CVD-W is obtained. As for the pure H neutral beam irradiated samples, the DB-SPBA results demonstrate that the CVD-W sample at the surface temperature of 1000 °C, compared to the 850 °C sample, shows a decrease in S parameters, which is due to the reduction of vacancy-type defect concentration. The defect damage layer in 1000 °C sample is narrower than that of 850 °C sample and the defect type tends to be consistent in 1000 °C sample. The SEM results suggest that the surface damage of the 1000 °C sample was recovered to some extent. As for the H + 6 at.% He neutral beam irradiated samples, compared with the CVD-W sample at the surface temperature of 700 °C, the 800 °C sample shows an increased S parameters, which can be attributed to the volume increase of vacancy-type defect. The defect damage layer in the 800 °C sample is wider than that of the 700 °C sample. Both the H + 6 at.% He irradiated samples show complex defect types. The surface of the 800 °C sample exhibits more dense pinhole damage structures compared to that of the 700 °C sample.