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"Penelitian ini bertujuan untuk mengetahui pengaruh perendaman larutan nanas terhadap kekerasan permukaan resin komposit bulk-fill. Enam puluh spesimen resin komposit Tetric®N-Ceram Bulk-Fill shadeIVB berdiameter 6 mm dan tebal 3 mm dibagi menjadi dua kelompok perlakuan, yaitu perendaman dengan aquades sebagai kontrol dan larutan nanas pH: 3,8±0,1(n= 30). Sebelumnya seluruh kelompok direndam terlebih dahulu dalam aquades selama 24 jam dalam inkubator bersuhu 37oC sebagai baseline. Kemudian masing-masing kelompok tadi akan direndam kembali dalam larutan selama 1 hari, 3 hari dan 7 hari (n= 10). Kekerasan permukaan diukur menggunakan HMV-G SeriesVickers Micro Hardness Tester Shimadzu®dengan indenter Knoop. Setiap spesimen akan diindentasi dengan beban sebesar 50 gf, sebanyak 5 kali indentasi. Hasil penelitian menunjukkan bahwa terdapat perbedaan bermakna (p<0,05)antara perendaman 1 hari, 3 hari dan 7 hari pada kelompok perendaman larutan nanas dengan uji One-way ANOVA. Disimpulkan bahwa larutan nanas dapat menurunkan kekerasan permukaan resin komposit bulk-fill.

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This study aims to determine effect of pineapple solution immersion on surface hardness of bulk-fill composite resin. Sixty specimens of Tetric®N-Ceram Bulk-Fill composite resin shade IVB, 6 mm in diameter and 3 mm thick were divided into two groups, with immersion in aquades as a control and pineapple solutionpH: 3,8±0,1 (n= 30). Before immersion, all specimens were immersed in aquades for 24 hours and were saved in incubator at 37oC as a baseline.Each group of immersions would be divided into three groups, with immersion for 1 day, 3 days and 7 days (n= 10). The surface hardness was measured using HMV-G Series Vickers Micro Hardness Tester Shimadzu®with Knoop Indenter. Each specimen was indented with load of 50 gf for 5 times. The results showed that there were statistically significant differences (p <0.05) between pineapple solution immersion for 1 day, 3 days and 7 days with One-way ANOVA test. It can be concluded that pineapple solution can reduce surface hardness of bulk-fill composite resin."

"ABSTRAKBackground: Currently, there has been a lot of bulk fill resin, such as bulk fill giomer which has S-PRG filler particles and other bulk fill resin composites which have their own uniqueness. Polymerization with irradiance

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ABSTRACTLatar Belakang Saat ini telah banyak berkembang komposit resin bulk fill, seperti giomer bulk fill yang memiliki partikel filler S PRG serta komposit resin bulk fill lain yang memiliki keunikan tersendiri. Polimerisasi dengan LED irradiansi "

"Tujuan penelitian ini adalah untuk mengetahui pengaruh jarak sumber sinar Light Emitting Diode (LED) terhadap kekuatan tarik diametral resin komposit bulk-fill. Resin komposit bulk-fill Tetric® N-Ceram Bulk-Fill, shade IVA (setara dengan warna VITA A2-A3) dibuat menjadi 30 spesimen berbentuk silinder dengan ukuran tebal 3 mm dan diameter 6 mm. Spesimen dibagi menjadi 3 kelompok variasi jarak penyinaran, yaitu 0 mm, 3 mm dan 5 mm. Penyinaran menggunakan LED Light Curing Unit Bluephase® Style (Ivoclar-Vivadent, Liechtenstein) dengan durasi penyinaran selama 10 detik sesuai instruksi pabrik. Data dianalisis secara statistik menggunakan metode ANOVA satu arah. Hasil analisis tidak menunjukkan perbedaan bermakna (p>0,05) pada semua kelompok. Jarak sumber sinar LED ≤ 5 mm tidak memberikan pengaruh yang signifikan terhadap kekuatan tarik diametral resin komposit bulk-fill.

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This study aimed to evaluate the effect of LED light source distance on diametral tensile strength of bulk-fill composite restorative material. Bulk-fill composite Tetric® N-Ceram Bulk-Fill, shade IVA (equal to VITA shade A2-A3) was formed into 30 cylindrical specimens with 3 mm in thickness and 6 mm in diameter. Specimens were divided into 3 groups with various curing distance: 0 mm, 3 mm and 5 mm. All groups were polymerized by LED Light Curing Unit Bluephase® Style (Ivoclar-Vivadent, Liechtenstein) for 10 seconds based on manufacturer’s instruction. Data were statistically analyzed by one-way ANOVA The result showed insignificant differences in all groups (p>0,05). LED light source distance ≤ 5 mm was not significantly affected the diametral tensile strength of bulk-fill composite."

"Penelitian ini bertujuan untuk mengevaluasi pengaruh durasi penyinaran dengan LED terhadap kebocoran tepi mikro restorasi resin komposit bulk-fill. Tiga puluh gigi premolar dipreparasi pada permukaan oklusal dengan panjang 4 mm, lebar 3 mm, dan kedalaman 4 mm yang disesuaikan dengan anatomi masing-masing gigi. Spesimen dibagi menjadi tiga kelompok secara acak berdasarkan durasi penyinaran 10 detik, 20 detik, dan 30 detik. Pengukuran kebocoran tepi mikro dilakukan menggunakan metode penetrasi zat warna, larutan methylene blue 1. Data yang diperoleh dianalisis menggunakan uji statistik Kruskal-Wallis. Hasil analisis tidak menunjukan perbedaan bermakna p>0,05 pada semua kelompok. Durasi penyinaran tidak memberikan pengaruh yang signifikan terhadap kebocoran tepi mikro restorasi resin komposit bulk-fill.

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This aims to evaluate the influence of different exposure time on its microleakage. Cavity preparation was perfomed on the occlusal side of thirty human premolar teeth with 4 mm length, 3 mm width, and 4 mm depth. Specimen were randomly divide into three groups according to exposure times 10s, 20s, and 30s. The microleakage was measured using 1 methylene blue. Data were statistically analyzed by Kruskal Wallis. The result showed insignificant differences in all groups p 0,05. Exposure times was not significantly affected the microleakage of bulk fill composite resin restoration. "

"Latar Belakang : Pada penelitian sebelumnya, iradiasi menggunakan iradiasi pulsa LCU cenderung diikuti dengan suhu cahaya yang relatif rendah sehingga aman untuk pulpa gigi dan telah diaplikasikan untuk polimerisasi resin komposit nanofil dalam waktu 20 detik. berdenyut melawan kekuatan kompresi selama 5, 10, 20 detik. Metode : 60 spesimen resin komposit isi curah silinder diameter 3 mm dan tebal 6 mm, diiradiasi dengan LCU eksperimental iradiasi pulsa dan LCU komersial iradiasi kontinyu sebagai kontrol selama 5, 10, 20 detik. Kemudian direndam dengan air suling selama 24 jam. Spesimen kemudian diuji kuat tekannya menggunakan mesin uji universal (Shimadzu AGS-X 5kN, Jepang) dengan kecepatan crosshead 0,5m/s. Hasil: terjadi peningkatan kuat tekan resin komposit isian curah iradiasidengan LCU eksperimental selama 5, 10, 20 detik, memiliki hasil berturut-turut sekitar 209,43 hingga 241,80 MPa. Kemudian dengan iradiasi kontinyu LCU komersial memiliki hasil berturut-turut sekitar 210,69 hingga 261,72 MPa. Analisis one-way ANOVA dan post hoc bonferroni menunjukkan hasil yang tidak berbeda nyata (p>0,05) nilai kuat tekan antara kedua metode penyinaran pada lama waktu yang sama. Tidak terdapat perbedaan yang signifikan pada masing-masing metode iradiasi pada durasi yang berbeda. Sementara itu, mendeteksi perbedaan yang signifikan (p<0,05) pada kekuatan tekan resin komposit pengisian curah dengan penyinaran antara 5 dan 10 detik dan 5 dan 20 detik dengan metode penyinaran kontinu. Kesimpulan: kuat tekan resin komposit bulk fill baik dengan iradiasi pulsa maupun kontinyu selama 5, 10, 20 detik meningkat dengan bertambahnya lama iradiasi, dan iradiasi menggunakan metode pulsa dankuat tekan kontinyu menghasilkan resin komposit bulk fill yang tidak berbeda nyata.Background : In previous studies, irradiation using LCU pulse irradiation tends to be followed by a relatively low light temperature so that it is safe for dental pulp and has been applied to polymerize nanofil composite resins within 20 seconds. pulse against the force of compression for 5, 10, 20 seconds. Methods : 60 specimens of cylindrical bulk-filled composite resin with a diameter of 3 mm and a thickness of 6 mm, were irradiated with pulse irradiation experimental LCU and continuous irradiated commercial LCU as control for 5, 10, 20 seconds. Then soaked with distilled water for 24 hours. The specimens were then tested for compressive strength using a universal testing machine (Shimadzu AGS-X 5kN, Japan) with a crosshead speed of 0.5m/s. Result: there was an increase in the compressive strength of the irradiated bulk filled composite resin with the experimental LCU for 5, 10, 20 s, had successive yields of about 209.43 to 241.80 MPa. Then with continuous irradiation commercial LCU has successive yields of about 210.69 to 261.72 MPa. One-way ANOVA and post hoc bonferroni analysis showed that the results were not significantly different (p>0.05) in the compressive strength between the two irradiation methods at the same time. There was no significant difference in each irradiation method at different durations. Meanwhile, detecting a significant difference (p<0.05) in the compressive strength of composite resin bulk filling with irradiation between 5 and 10 seconds and 5 and 20 seconds with the continuous irradiation method. Conclusion: the compressive strength of bulk fill composite resins both with pulse and continuous irradiation for 5, 10, 20 seconds increased with increasing irradiation time, and irradiation using pulse and pulse irradiation methods continuous compressive strength resulted in bulk fill composite resin which was not significantly different."

"Resin komposit bulk-fill adalah jenis resin komposit yang dapat menghemat waktu pengerjaan dan mengurangi kemungkinan jebakan udara karena mempunyai kemampuan untuk berpolimerasi secara memadai dengan depth of cure 4-5 mm. Ketahanan resin komposit terhadap keausan dipengaruhi oleh beberapa faktor salah satunya adalah kekerasan permukaan. pH asam adalah salah satu faktor yang bisa menyebabkan terjadinya penurunan tingkat kekerasan resin komposit. Obat kumur herbal adalah salah satu produk dengan variasi pH yang banyak digunakan untuk mengatasi masalah pada rongga mulut. Tujuan: Penelitian ini bertujuan untuk mengetahui pengaruh pH beberapa jenis obat kumur herbal terhadap kekerasan permukaan resin komposit bulk-fill Metode: Tiga puluh dua (32) spesimen resin komposti bulk-fill (Tetric® N-Ceram bulk-fill shade IVA dengan diameter 6 mm dan tinggi 3 mm) dibagi menjadi 4 kelompok dengan masing-masing kelompok terdiri dari 8 spesimen. Masing-masing spesimen akan dilakukan perendaman pada suhu 370 C selama 6 jam dalam 20 ml larutan yang terdiri dari akuades (pH 6,78), pepsodent herbal natural (pH 6,54), total care lemon herbs (pH 5,04), listerine gum care jahe herbal (pH 4,07). Sebelum dan sesudah perendaman masing-masing spesimen akan diukur nilai kekerasan permukaan dengan Knoop Hardness Tester (HMV-G®: G21 Series Micro Vickers Hardness Tester Shimadzu) Hasil: Terjadi penurunan kekerasan permukaan resin komposit Tetric® N-Ceram Bulk-fill setelah direndam dalam semua larutan. Nilai rata-rata kekerasan permukaan sebelum perendaman untuk semua spesimen adalah 37,89±0,50 KHN. Sedangkan nilai rata-rata kekerasan permukaan sesudah perendaman pada masing-masing kelompok adalah akuades (pH 6,78) sebagai kelompok kontrol 36,36±1,01 KHN, obat kumur pepsodent 34,31±0,65 KHN, total care lemon herbs (pH 5,04) 32,41±0,61 KHN, obat kumur listerine gum care jahe herbal 30,68±0,43 KHN. Berdasarkan hasil uji One-Way ANOVA dan uji Post Hoc Post Hoc Tamhane menunjukkan bahwa terdapat perbedaan bermakna (p < 0,05) antar semua kelompok perendaman. Kesimpulan: Terdapat penurunan nilai kekerasan permukaan resin komposit bulk-fill setelah dilakukan peredaman dalam larutan akuades, pepsodent herbal natural, total care lemon herbs, listerine gum care jahe herbal mouthwash selama 6 jam dan penurunan nilai kekerasan permukaan tertinggi terjadi kelompok listerine gum care jahe herbal dan penurunan kekerasan terendah terjadi pada kelompok akuades.

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Background: Bulk-fill resin composite is a type of resin composite that not only allows minimal processing time but also minimal possibility of air trapping due to its ability to properly polymerize with the depth of cure 4-5 mm. There are several factors that affect the wear resistance of resin composite, one of which is surface hardness which is highly impacted by the acidity level (pH). Herbal mouthwash is an example of product that offers wide variety of pH content used for oral cavity treatment. Aims: This study aims to determine the impact of pH level of several herbal mouthwash on the surface hardness of bulk-fill resin composite. Methods: There were thirty two (32) bulk fill resin composite specimens prepared (Tetric® N-Ceram bulk-fill shade IVA with a diameter of 6 mm and a thick of 3 mm), which then equally divided into four different groups, based on the solution used for soaking. The first group used 20ml of distilled water that has pH of 6.78. The second group was soaked in 20 ml of pepsodent herbal natural mouthwash solution with slightly lower pH content of 6.52. Group three had 20 ml of total care lemon herbs with even lower pH content of 5.04. Lastly, the last group (group four) used 20ml listerine gum care herbal ginger solution that has the least pH content of 4.07. The soaking process for each specimen was done at temperature of 37 celcius for approximately six hours. The measurement of the specimens’ surface hardness was performed using Knoop Hardness Tester (HMV-G®: G21 Series Micro Vickers Hardness Tester Shimadzu), prior to and after the soaking process. Results: There was a decrease in the surface hardness of the Tetric® N-Ceram bulk-fill composite resin after being immersed in all solutions. The average value of surface hardness before immersion for all specimens was 37.89±0.50 KHN. While the average value of surface hardness after soaking in each group was distilled water (pH 6.78) as the control group 36.36±1.01 KHN, Pepsodent mouthwash 34.31±0.65 KHN, total care lemon herbs (pH 5.04) 32.41±0.61 KHN, mouthwash listerine gum care herbal ginger 30.68±0.43 KHN. Based on the One-Way ANOVA test and the Post Hoc Tamhane test, it can be inferred that there is a significant difference (p<0.05) among the immersion groups. Conclusion: There was a decrease in the surface hardness value of the Bulk-fill composite resin after soaking in a solution of distilled water, natural herbal pepsodent, total care lemon herbs, listerine gum care ginger herbal mouthwash for 6 hours and the highest decrease in surface hardness value occurred in the listerine gum care herbal ginger group and the lowest decrease in hardness occurred in the distilled water group."

"Latar Belakang: Resin komposit bulk-fill dapat merestorasi kavitas dengan kedalaman 4-5 mm dalam sekali penyinaran sehingga dapat mempersingkat prosedur restorasi, Polimerisasi resin komposit dapat dipengaruhi oleh suhu, termasuk suhu penyimpanan dan preheating resin komposit. Polimerisasi yang adekuat diperlukan untuk mendapatkan kekerasan permukaan yang optimal. Tujuan: Mengetahui pengaruh suhu penyimpanan dan preheating terhadap kekerasan permukaan resin komposit bulk-fill. Metode: Tiga puluh spesimen Tetric® N-Ceram Bulk-Fill shade IVA (diameter 6 mm dan tebal 3 mm) dibuat dari 3 kelompok perlakuan yaitu resin komposit yang disimpan pada suhu ruangan 23±1°C selama 24 jam (kontrol), lemari pendingin 4±1°C selama 24 jam, dan preheating 39°C selama 10 menit. Spesimen dipolimerisasi menggunakan light curing unit LED berintensitas 1100 mW/cm2 selama 10 detik dan disimpan di inkubator pada suhu 37°C selama 24 jam. Uji kekerasan menggunakan Knoop Microhardness Tester. Analisis data dengan uji statistik One-Way ANOVA dan Post Hoc Bonferroni. Hasil: Kekerasan permukaan antara kelompok perlakuan suhu penyimpanan dan preheating menunjukkan terdapat perbedaan bermakna secara statistik (p<0,05). Kesimpulan: Kekerasan permukaan resin komposit bulk-fill pada suhu penyimpanan di lemari pendingin 4±1˚C lebih rendah dibandingkan di ruangan 23±1˚C, sedangkan kekerasan permukaan resin komposit bulk-fill dengan suhu preheating 39˚C lebih tinggi dibandingkan penyimpanan di ruangan 23±1˚C.

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Background: Bulk-fill composite resin could be used in 4-5 mm thickness for each photo-polymerization so that it can shorten the restoration procedure time. Polymerization of composite resin can be affected by temperature, including composite resin’s storage temperature and preheating. Adequate polymerization needed to achieve optimal surface hardness or composite resin. Objective: To evaluate the influence of storage temperature and preheating on surface hardness of Bulk-fill Composite Resin. Methods: Thirty specimens of Tetric® N-Ceram Bulk-Fill shade IVA (6 mm of diameter and 3 mm of thickness) were made from 3 groups according to storage temperature and preheating of the composite: (1) room temperature 23±1°C for 24 hours (control), (2) refrigerator temperature 4±1°C for 24 hours, and (3) preheating 39°C for 10 minutes. Each specimen was polymerized using LED Curing Unit for 10 minutes with 1100 mW/cm2 intensity, then immersed in 5 ml of aquadest and kept in 37°C incubator for 24 hours. urface hardness was measured using Knoop Microhardness Tester at the top surfaces. Data were statistically analyzed using One-Way ANOVA and Post Hoc Bonferroni test. Result: There was a statistically significant difference (p0,05) of surface hardness value between all test groups. Conclusion: Surface hardness of bulk-fill composite resin at refrigerator temperature 4±1˚C are lower than room temperature 23±1˚C, while surface hardness of bulk-fill composite resin with preheating 39°C are higher than room temperature 23±1˚C."

"Tujuan: Penelitian ini bertujuan untuk menganalisis pengaruh gel acidulated phosphate fluoride (APF) terhadap kerentanan perubahan warna resin komposit bulk-fill flowable dalam larutan teh hitam. Metode penelitian: Dua puluh spesimen dengan diameter 6mm dan tebal 2mm dibagi menjadi dua kelompok. Salah satu kelompok diaplikasikan gel APF selama 30 menit kemudian kedua kelompok direndam dalam larutan teh hitam selama 7 hari. Seluruh spesimen dibersihkan menggunakkan ultrasonic cleaner sebelum pengukuran warna. Pengukuran warna dilakukan dengan colorimeter kemudian dilakukan perhitungan perubahan warna. Hasil: Analisis data hasil penelitian menunjukkan bahwa tidak terdapat perbedaan perubahan warna yang bermakna berdasarkan uji independent t-test (p>0,05) antara kelompok yang sebelumnya diaplikasikan gel APF dan tidak diaplikasikan gel APF.Kesimpulan: Aplikasi APF tidak memiliki pengaruh terhadap perubahan warna resin komposit bulk-fill flowable dalam larutan teh hitam.

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Objective: This study aims to analyze the influence of acidulated phosphate fluoride gel on bulk-fill composite resin discoloration by black tea solution.

Research method: Twenty specimen 2 mm in thickness and 6 mm in diameter divided into two groups. APF gel applied on one of the group for 30 minutes, then each group was immersed in black tea solutions for 7 days. The specimens were then cleaned with ultrasonic cleaner for 3 minutes. The color measured using colorimeter then color differences were calculated.

Result: The result showed that there were statistically insignificant color change differences (p>0.05) between two groups.

Conclusion: APF application had no effect on the discoloration of the bulk-fill composite resin in black tea solution."

"ABSTRAKKavitas kelas I sering ditemui pada permukaan gigi molar karena mempunyai bentuk anatomi pit dan fisur yang dalam sehingga sering menyebabkan sisa makanan tertinggal yang nantinya dapat menyebabkan karies gigi. Bahan restorasi yang sesuai untuk penumpatan kavitas kelas I adalah resin komposit. Namun resin komposit memiliki kelemahan yaitu mengalami penyusutan polimerisasi yang menyebabkan kebocoran tepi. Kavitas kelas I juga memiliki c-factor terbesar dibandingkan kavitas lainnya yang dapat menyebabkan kebocoran, sehingga untuk mengatasinya dapat menggunakan liner SIKMR serta teknik Bulk-fill dan inkremental oblik. Tujuan dari penelitian ini adalah menganalisis kebocoran tepi restorasi resin komposit teknik Bulk-fill dengan liner dan teknik inkremental dengan liner. Sebanyak 70 sampel dipreparasi dibagian bukal dengan ukuran 3 mm x 3 mm, terdiri dari 10 sampel kelompok Bulk-fill, 30 sampel kelompok Bulk-fill dengan liner SIKMR dan 30 sampel kelompok inkremental oblik. dengan liner SIKMR direndam dalam air destilasi selama 24 jam. Kemudian dilakukan Thermocycling 250x, suhu 5-550C dilanjutkan dengan aplikasi cat kuku dan rendam dalam metilen biru selama 24 jam. Sampel dibelah dalam arah buko-palatal dan dilakukan pengamatan menggunakan mikroskop stereo kemudian hasilnya diuji statistik menggunakan uji Chi-Square. Hasil uji statistik menunjukkan adanya perbedaan yang bermakna diantara semua kelompok dengan nilai signifikansi p≤0,05. Inkremental oblik dengan liner menunjukkan tingkat kebocoran lebih rendah dibandingkan Bulk-fill dengan liner.

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ABSTRACTCavity class I often found on the surface of the molars because they have the anatomical shape of pits and fissures are deep that often cause food scraps left behind which can later lead to dental caries. Restorative material suitable for cavities penumpatan class I is the composite resin. However, a drawback of composite resin namely polymerization shrinkage which causes microleakage. Cavity class I also have a c-factor compared to most other cavity which can cause leaks, so to overcome SIKMR can use the liner as well as bulk-fill technique and incremental oblique. The purpose of this study was to analyze the microleakage of composite resin restorations Bulk-fill technique and oblique incremental techniques with liner. A total of 70 samples were prepared on the buccal with the size of 3 mm x 3 mm, consisting of 10 groups of Bulk-fill samples, 30 samples of Bulk-fill groups with liner SIKMR and oblique incremental groups of 30 samples. with liner SIKMR soaked in distilled water for 24 hours. Then do the Thermocycling 250X, 5-550 C temperature followed by application of nail polish and soak in methylene blue for 24 h. Samples were cleaved in buko-palatal direction and made observations using a stereo microscope and the result was tested statistically using Chi-Square. Statistical analysis showed significant differences among all groups with significant value p≤0,05. Incremental oblique with liner show a lower leakage rate than the Bulk-fill with liner."

"Penelitian ini bertujuan untuk mengetahui pengaruh perendaman minuman isotonik terhadap kekerasan permukaan resin komposit bulk-fill. Enam puluh spesimen Tetric N-Ceram Bulk-Fill berdiameter 6 mm dan tinggi 3 mm dibagi menjadi 2 kelompok perendaman yaitu dengan akuades (kontrol) dan minuman isotonik. Setiap kelompok direndam dengan lama perendaman 1 hari, 3 hari dan 7 hari. Kekerasan permukaan diuji menggunakan HMV-G Series Micro Vickers Hardness Tester.Hasil menunjukan terdapat perbedaan bermakna (p<0,05) antara perendaman akuades dan minuman isotonik uji Independent T-Test. Hasil menunjukkan bahwa terdapat perbedaan bermakna (p<0,05) antara semua kelompok perendaman minuman isotonik dengan lama perendaman 1 hari, 3 hari dan 7 hari dengan uji statistik One-Way Anova dan PostHoc Tukey HSD. Dapat disimpulkan bahwa minuman isotonik mempengaruhi kekerasan permukaan resin komposit bulk-fill.

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This study aims to determine the influence of isotonic drink immersion on surface hardness of bulk-fill composite. Sixty specimens of Tetric N-Ceram Bulk-Fill, 6 mm in diameter and 3 mm height were divided into two groups of storage media; deionized water (control) and isotonic drink. Each group was for 1 day, 3 days and 7 days. The surface hardness is measured using a HMV-G Series Micro Vickers Hardness Tester.

The results showed that there were significant differences (p <0.05) between immersion of control and isotonic drink with Independet T-Test. The results showed that there were significant differences (p <0.05) between all isotonic drink immersion groups with immersion duration of 1 day, 3 days and 7 days with One-Way Anova Test and Post Hoc Tukey HSD. It can be concluded that isotonic drinks affect the surface hardness of bulk-fill composite."