This study aimed to investigate the potential use of brown algae Sargassum polycystum as irreversible hydrocolloid (alginate) impression material. Potassium alginate extracted from Sargassum polycystum was prepared in three different compositions (14%, 15%, and 16%) and mixed with other standard components to form an alginate impression material. Prior to that, the purity of potassium alginate was quantified with Fourier Transform Infrared Spectroscopy (FTIR) analysis. As a control material, the alginate impression material from a commercially available product was used. All alginate impression materials were then applied to a die stone model. Dimensional accuracy was measured by calculating the mesiodistal width of incisors in the generated dental cast using a digital caliper 0.01 accuracy (five replications). In addition, to evaluate the dimensional stability, the impression results were poured at four different periods (immediately, 5 min, 10 min, and 15 min). An independent t-test was performed to compare the measurement results with p < 0.05 considered significant. Analytical results confirm that the impression material containing 15% potassium alginate gives the best dimensional accuracy similar to control (p > 0.05). Meanwhile, the optimal dimensional stability was produced in the impression material containing 16% potassium alginate. Our study suggested that brown algae Sargassum polycystum has a promising potential to be used as an alginate impression material in clinical application.

Pendahuluan: Terjadinya perubahan warna gigi membuat masyarakat ingin mendapatkan senyum lebih indah dan gigi lebih putih yang dapat dilakukan perawatan dengan prosedur pemutihan gigi (bleaching). Bahan alami yang dimanfaat seperti buah anggur, stroberi, tomat, apel, jeruk nipis dan madu. Salah satu bahan alami tersebut memiliki efek yang lebih baik dalam memutihkan gigi adalah buah stroberi karena memiliki kandungan asam ellegat (ellagic acid) dan asam malat (melic acid). Tujuan Penelitian: untuk mengevaluasi manfaat ekstrak buah stroberi sebagai bahan alternatif yang dapat digunakan untuk meningkatkan kecerahan warna pada email gigi. Bahan dan Metode: jenis penelitian ini adalah eksperimental laboratoris dengan desain penelitian pre and post test with kontrol design. Kelompok sampel terbagi menjadi tiga kelompok, yaitu kelompok 1: gigi premolar post-ekstraksi yang sudah didiskolorisasi dan direndam di dalam pasta buah stroberi 100%. Kelompok 2: gigi premolar post-ekstraksi yang sudah didiskolorasi direndam di dalam gel Karbamid Peroksida 10%. Kelompok 3: gigi premolar post-ektraksi yang sudah didiskolorisasi yang kemudian direndam di dalam air kemasan biasa. Hasil: Berdasarkan hasil penelitian yang ditemukan bahwa terdapat perbedaan warna email pada unsur sebelum dan sesudah diaplikasikan dengan buah Stroberi 100% dan Karbamid Peroksida 10%. Selain itu, juga terdapat perbedaan tingkat perubahan warna email gigi yang diaplikasikan dengan buah Stroberi 100% dan Karbamid peroksida 10%. Kesimpulan: ekstrak buah Stroberi dalam bentuk pasta terbukti efektif dalam meningkatkan warna pada email gigi.

Objective: This study was conducted to determine the effect of COVID-19 infection on the manifestations that arise in the oral environment. Methods : This study was conducted in the form of a literature review by collecting secondary data from online scientific article databases, such as PubMed, Google Scholar, and Science Direct. Results: There are various oral manifestations of COVID-19. The most common oral manifestations were xerostomia, impaired taste, burning sensation, and oral/dental pain. Conclusion : COVID-19 can cause manifestations in the oral environment which generally occur as early symptoms or in the acute phase of COVID-19.

Alveolar bone loss is a characteristic of the development of periodontitis; its prevention is a major clinical challenge in the treatment of periodontal disease. Alveolar bone loss can significantly affect a patient's quality of life. In addressing the chal-lenges of recovering alveolar bone loss, fucoidan has attracted attention as a potential material due to its numerous biological activities, one of which is its potential to regulate osteogenic cell function so as to facilitate osteoblast cell proliferation and promote bone mineralization and development. This literature discusses the role of fucoidan, especially in stimulating osteo-blast cells in cases of alveolar bone loss.