This research aims to explain 1) the different impact among Numbered Heads Together (NHT) model and direct instruction on the science learning outcomes. 2) the different effect among the high, medium and low self regulated learning on the students' learning outcomes of science. 3) the interaction among the learning models and self regulated learning towards the students' learning outcomes of science. The type of research was quasi-experimental research with factorial design 2×3. Population of this research was all students of fifth grade elementary school. The hypothesis test used two-way analysis variant with unbalanced cells. Based on data analysis, Numbered Heads Together model with high self regulated learning was the most effective.
Media pembelajaran menjadi menarik perhatian siswa pada kegiatan belajar mengajar jika merangsang kegiatan belajar siswa. Salah satu media tersebut adalah media permainan. Penelitian ini bertujuan adalah untuk mengetahui implementasi media permainan dalam peningkatan kualitas pembelajaran matematika di sekolah dasar. Penelitian ini menggunakan prosedur penelitian tindakan kelas yang terdiri dari 3 siklus. Teknik pengumpulan data adalah observasi, dokumentasi, rubrik, tes dan catatan lapangan. Permainan yang diterapkan adalah permainan ular tangga, permainan sirkuit, dan monopoli bintang yang dimodifikasi dengan materi matematika sekolah dasar. Media permainan dalam ketiga sub penelitian tersebut bukan dimaksudkan untuk menerapkan konsep, melainkan sebagai pelatih ketrampilan. Media permainan membangkitkan semangat bagi siswa untuk meningkatkan keterampilannya dengan perasaan senang. Perasaan senang inilah yang mendorong siswa untuk terus berlatih. Hasil penelitian ini menunjukkan bahwa media permainan dapat membantu dalam meningkatkan kualitas pembelajaran matematika di sekolah dasar ditinjau dari aspek keterampilan guru, aktivitas siswa, peningkatan hasil belajar, kualitas materi dan iklim belajar. Dibuktikan dari hasil skor yang mengalami peningkatan pada setiap siklus (I, II dan III) melalui implementasi ketiga media. Media permainan dapat membantu dalam peningkatan kualitas pembelajaran matematika di sekolah dasar khusunya kelas tinggi.
Direct composite veneer is often done to increase the aesthetics of teeth after bleaching. In direct composite veneer treatment, the presence of free radicals residual after bleaching can inhibit the polymerization of the bonding agent and decrease composite shear bond strength. Increasing shear bond strength of composite resin after bleaching can be done with the application of antioxidant agent. Guava is a fruit rich in antioxidant such as ascorbic acids, carotenoids and fenols. This study aims to evaluate the difference between the effectiveness of 10%, 20%, and 40% guava extract solution as natural antioxidants to improve the shear bond strength of direct composite veneer to bleached enamel. This cross-sectional study design divided 20 permanent premolar teeth into four groups: control group, 10%, 20%, and 40% guava extract solution group. Composite shear bond strength was measured with Universal Testing Machine. Data were analyzed using ANOVA followed by a Post Hoc test. The result showed shear bond strength of the four groups' scores was 1.33 ± 0.42 MPa, 3.0 ± 1.06 MPa, 2.11 ± 0.61 MPa, and 1.94 ± 0.65 MPa, respectively. Significant highest shear bond strength values were observed in the 10% guava extract solution group (p < 0.05). 10% guava extract solution was the most effective natural antioxidant to improve the shear bond strength of direct composite veneer to bleached enamel.In conclusion, 10% guava extract solution was the most effective natural antioxidant to improve shear bond strength of direct composite veneer to bleached enamel. The significance of this study was to find alternative natural antioxidants applications after tooth bleaching.
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