As part of the globalization strategies, this report aims to disseminate information on the academic exchange initiatives among educational institutions across countries and consequently encourage further scientific collaborations. The Universitas Muhammadiyah Yogyakarta (UMY) and Universitas Gadjah Mada (UGM) in Yogyakarta, Indonesia, organized an academic gathering held last March 20 and 21, 2025, respectively. I was invited as one of the speakers for the said event, with the goal of advancing academic knowledge among students, researchers, and faculty. My presentation was titled “Research Beyond Borders: The Experience of an International Student”, highlighting the experimental procedures involved in my academic investigations. Additionally, I shared about the journey and challenges of being an international student conducting research in Japan. The presentation was similarly structured at both universities, giving more emphasis on scientific methodologies and research design to the postgraduate audience. This gathering offered an avenue for exchanging academic insights, thereby promoting communication and potential collaborations.

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This study aimed to clarify the effect of exposure frequency on the image quality obtained using imaging plates (IPs) from two types of intraoral imaging systems ̶ Digora Optime (Soredex, Tuusula, Finland) and VistaScan Perio (Dürr Dental, Bietigheim-Bissingen, Germany). Both types of IP were grouped into three groups, with 6 IPs of Digora Optime and 6 IPs of VistaScan Perio for each group. Group A with 10 exposures/day, group B with 10 exposures/week, and group C with 10 exposures/4 weeks. Group A was assumed to be simulation of dental clinics with few IPs that use same IP once a day. Group B was assumed to be simulation of dental clinics with more IPs that use the same IP about twice a day, and group C was set as control group with the exposure frequency set. A six-level aluminum step wedge was used as a phantom to observe the changes in image contrast and granularity for 64 weeks Previous studies have shown that IP can be used more than 3,000 times without causing significant changes in the average pixel value; however, corner artifacts appear in most images, so it is recommended not to use IP more than 3,000 times. Therefore, in this study, measurements were continued until 64 weeks, when the maximum irradiation frequency exceeded 3,000 times and the total line dose was the same for each group. Image contrast was evaluated by measuring the contrast-to-noise ratio (CNR) and low contrast value (LCV). Image background granularity was evaluated by measuring root-mean-square (RMS) value. Digora Optime IPs showed a large percentage change and significant differences in CNR, LCV, and RMS values at 64 weeks. In contrast, VistaScan Perio only showed significant changes in LCV at 64 weeks. However, a trend for greater changes in CNR, LCV, and RMS values in the group with higher exposure frequency (Groups A and B) than the group with lower exposure frequency (Group C) was observed in both IP systems. These findings indicate that the exposure frequency affects both the contrast and granularity of images obtained using IPs. This effect was stronger in IP systems equipped with automatic exposure control (AEC) (Digora Optime) than in those without AEC (VistaScan Perio).

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Background: Cellulitis is an acute bacterial infection of the dermis and subcutaneous tissue characterized by diffuse inflammation, erythema, swelling, warmth, and tenderness. If the disease progresses, it can lead to serious complications such as sepsis. In this report, we present the clinical course of a patient with cerebral palsy and intellectual disability in whom a progressive odontogenic infection was identified following the onset of lip swelling.
Case presentation: A 53-year-old man presented with a chief complaint lip swelling. Marked lower lip swelling was observed along with dental caries, accompanied by abscess in the anterior mandibular region. Blood tests revealed a C-reactive protein (CRP) level of 10.9 mg/dl, and a White blood cell count of 12,600/μl. The affected teeth were extracted under general anesthesia after antibiotic therapy, incision, and drainage. The lip swelling resolved, and the patient was diagnosed with lower lip cellulitis secondary to apical periodontitis.
Conclusion: Lower lip cellulitis is rare. In the present case, the patient with intellectual disability was unable to express subjective symptoms; however, lip swelling was noticed by a caregiver, which led to the patient visiting our department. Although the extension of inflammation to the oral floor could have resulted in more severe symptoms, the spread to the lip allowed for early recognition and timely intervention. This case highlights the importance of close observation by caregivers and clinicians, especially in patients with communication difficulties, for early detection of potentially serious infections.

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