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Microhardness of packable and bulkfill composite resin with different cavity depths . Bulkfill composite resin restorations are increasingly popular because the material can be irradiated with a thickness reaching 4 mm, making it easier to apply. The objective of this study was to determine the differences in the microhardness between packable and bulkfill composite resin restorations with a cavity depth of 2 mm and 4 mm. This study was done using 32 Teon molds (5 mm diameter), and grouped randomly into 4 groups in which each consisted of 8 samples. Group 1A, packable composite resin was applied to the mold with a cavity depth of 2 mm. Group 1B, bulkfill composite resin was applied to the mold with a cavity depth of 2 mm. Group 2A, packable composite resin was applied with a depth of 4 mm. Group 2B, bulkfill composite resin was applied with a depth of 4 mm. Each sample was immersed in articial saliva with a pH of 6.8 and stored in an incubator at a temperature of 37°C for 24 hours. The hardness of each sample was tested using Vickers indenter microhardness tester. The data obtained were then analyzed by using two-way ANOVA, followed by Tukey’s test. The results showed that bulkfill composite resin with a cavity depth of 2 mm has the highest average of microhardness (31.09 ± 2.02 VHN), followed by packable composite resin with a depth of 2 mm (17.52 ± 1.25 VHN), bulkfill with a depth of 4 mm (11.97 ± 1.23 VHN) and packable with a depth of 4 mm (3.18 ± 0.85 VHN). The two-way ANOVA analysis showed that there are significant differences between the types of composite resin and cavity depths (p < 0.05), and there is interaction between the types of composite resin and cavity depth (p<0.05). In conclusion, the microhardness of packable composite resin is lower than that of bulkfill at a cavity depth of 2 and 4 mm. ABSTRAK Restorasi resin komposit dengan bulkfill semakin populer karena material tersebut dapat disinar dengan ketebalan sampai 4 mm, sehingga mudah diaplikasikan. Tujuan dari penelitian ini adalah untuk mengetahui perbedaan kekerasan mikro restorasi resin komposit packable dan bulkfill dengan kedalaman kavitas 2 mm dan 4 mm. Penelitian ini dilakukan dengan menggunakan 32 cetakan Teflon (diameter 5 mm), dan dikelompokkan secara random menjadi 4 kelompok yang masing-masing terdiri dari 8 sampel. Kelompok 1A, cetakan diaplikasikan resin komposit packable dengan kedalaman kavitas 2 mm. Kelompok 1B, diaplikasikan komposit bulkfill dengan kedalam 2 mm. Kelompok 2A, diaplikasikan komposit packable dengan kedalaman 4 mm. Kelompok 2B, diaplikasikan komposit bulkfill dengan kedalaman 4 mm. Setiap sampel direndam dalam saliva buatan dengan pH 6,8 dan disimpan dalam inkubator dengan suhu 37 °C selama 24 jam. Setiap sampel diuji kekerasannya menggunakan Vickers indenter microhardness tester . Data yang diperoleh dianalisis dengan ANOVA dua jalur, dilanjutkan uji Tukey’s. Hasil penelitian menunjukkan resin komposit bulkfill dengan kedalaman kavitas 2 mm memiliki rerata kekerasan mikro tertinggi (31,09 ± 2,02 VHN), diikuti oleh resin komposit packable dengan kedalaman 2 mm (17,52 ± 1,25 VHN), bulkfill dengan kedalaman 4 mm (11,97 ± 1,23 VHN) dan packable dengan kedalaman 4 mm (3,18 ± 0,85 VHN). Analisis ANOVA dua jalur menunjukkan bahwa terdapat perbedaan yang signifikan antara jenis resin komposit dan antara kedalaman kavitas (p < 0,05), serta terdapat interaksi antara jenis resin komposit dan kedalaman kavitas (p < 0,05). Kesimpulannya, kekerasan mikro resin komposit packable lebih rendah dibandingkan bulkfill baik pada kedalaman kavitas 2 dan 4 mm.

Kekerasan mikro resin komposit packable dan bulkfill dengan kedalaman kavitas berbeda