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Andi Soufyan
"Composite resin are restorative materials having color similar to teeth and have been widely used in dentistry. The successful application of composite resin influences the duration of the restoration in the oral cavity. The aim of this research is to describe the influence of artificial saliva contamination and the application of re-conditioning on tensile bond strength of composite resin to dentin. In the control group, the dentin were etched, bonding were applied and composite resin were restored on the dentin. In the group with artificial saliva contamination without re-conditioning, the dentin were etched, bonding were applied and then contaminated with artificial saliva, dried and then restired with composite resin. While the group with artificial saliva contamination with re-conditioning, the dentin were etched, bonding were applied and contaminated with artificial saliva, and then etched and applied bonding agent and restored composite resin.Bond strength test used “Universal testing machine, AG 5000. The results showed that highest value of tensile bond strength of composite resin to dentin was at the control group. It can be concluded that artificial saliva contamination decreased tensile bond strength while re-conditioning application increased it."
Fakultas Kedokteran Gigi Universitas Indonesia, 2008
AJ-Pdf
Artikel Jurnal  Universitas Indonesia Library
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"The use of resin composites as posterior restoratives has markedly increased over the past decade. The patients demand for better esthetics, concerns related to possible mercury toxicity from amalgam and improvements in resin composite materials have significantly contributed the popularity of these materials. Early problems related to composites included excessive wear, less of anatomic form, post operative sensitivity, secondary caries and marginal leakage. Marginal adaptation still remains an unavoidable problem for composite restoration, especially at the gingival wall of cervical or Class II restoration. In an attempt to improve marginal sealing, many techniques and lining materials have been designed. To reduce stress generated by polymerization shrinkage, applying and curing of resin composites in layers is often recommended. Using a thick adhesive layer or a low-viscosity resin may, due to its elastic properties, serve as a flexible intermediate layer and compensate for the polymerization stress created in resin composite. Flowable composites were created by retaining the same small practicle size of traditional hybrid composite but reducing the filler content and allowing the increased resin to reduce the viscosity of the mixture. Flowable composites were introduced in 1996 as liners, fissure sealants and also in tunnel preparations. They have been suggested for Class I, II, III and V cavity restorations, preventive resin restorations and composite, porcelain and amalgam repairing. Their usage as a liner under high filled resins in posterior restorations has been shown to improve the adaptation of composites and effectively achieve clinically acceptable results. This article attempts to give a broad characteristics of different types of flowable composites. "
Journal of Dentistry Indonesia, 2005
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Artikel Jurnal  Universitas Indonesia Library
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Lutfi Laili Nurhidayat
"ABSTRACT
Latar Belakang: Jumlah penduduk lansia di kota Depok terus mengalami peningkatan. Lansia memiliki kerentanan terhadap penyakit sistemik maupun gigi dan mulut yang saling berhubungan, salah satunya perubahan kualitas dan kuantitas saliva. Namun, belum ada penelitian dengan subjek lansia mengenai profil saliva yang dilakukan di kota Depok. Tujuan: Mengetahui profil saliva antar jenis kelamin, kelompok usia, jenis penyakit sistemik, medikasi dan persepsi serostomia pada lansia di kota Depok. Metode: Studi analitik observasional dengan desain penelitian potong lintang. Pengambilan sampel dengan teknik consecutive sampling pada subjek berusia ge; 60 tahun yang berdomisili di Depok. Subjek diperiksa volume saliva tanpa stimulasi, terstimulasi, derajat keasaman dan kapasitas dapar. Subjek menjawab kuesioner Fox mengenai serostomia dan kuesioner tentang penyakit sistemik dan medikasi. Penelitian ini dianalisis dengan uji Mann Whitney-U, Kruskal Wallis dan korelasi Spearman ?=5 . Hasil: Jenis kelamin memiliki hubungan dengan laju alir saliva, tetapi derajat keasaman dan kapasitas dapar tidak. Tidak terdapat perbedaan profil saliva antar kelompok usia, jenis penyakit sistemik dan medikasi. Koefisien korelasi antara serostomia dengan laju alir terstimulasi lebik kuat 0,426 dibanding tanpa stimulasi 0,303 . Kesimpulan: Laju alir saliva memiliki perbedaan bermakna antara laki-laki dan perempuan, tetapi tidak berbeda bermakna antar kelompok usia, jenis penyakit sistemik dan medikasi. Derajat keasaman dan kapasitas dapar tidak berbeda bermakna antar jenis kelamin, kelompok usia, jenis penyakit sistemik dan medikasi. Persepsi serostomia berhubungan dengan laju alir saliva.

ABSTRACT
Latar Belakang Jumlah penduduk lansia di kota Depok terus mengalami peningkatan. Lansia memiliki kerentanan terhadap penyakit sistemik maupun gigi dan mulut yang saling berhubungan, salah satunya perubahan kualitas dan kuantitas saliva. Namun, belum ada penelitian dengan subjek lansia mengenai profil saliva yang dilakukan di kota Depok. Tujuan Mengetahui profil saliva antar jenis kelamin, kelompok usia, jenis penyakit sistemik, medikasi dan persepsi serostomia pada lansia di kota Depok. Metode Studi analitik observasional dengan desain penelitian potong lintang. Pengambilan sampel dengan teknik consecutive sampling pada subjek berusia ge 60 tahun yang berdomisili di Depok. Subjek diperiksa volume saliva tanpa stimulasi, terstimulasi, derajat keasaman dan kapasitas dapar. Subjek menjawab kuesioner Fox mengenai serostomia dan kuesioner tentang penyakit sistemik dan medikasi. Penelitian ini dianalisis dengan uji Mann Whitney U, Kruskal Wallis dan korelasi Spearman 5 . Hasil Jenis kelamin memiliki hubungan dengan laju alir saliva, tetapi tidak pada pada derajat keasaman dan kapasitas dapar. Tidak terdapat perbedaan profil saliva antar jenis penyakit sistemik dan medikasi yang dikonsumsi subjek. Koefisien korelasi antara serostomia dengan laju alir terstimulasi lebik kuat 0,426 dibanding laju alir tanpa stimulasi 0,303 . Kesimpulan Laju alir tanpa stimulasi dan terstimulasi, memiliki perbedaan yang bermakna antara laki laki dan perempuan, tetapi tidak berbeda bermakna antar kelompok usia, jenis penyakit sistemik dan medikasi. Derajat keasaman dan kapasitas dapar tidak berbeda bermakna antar jenis kelamin, kelompok usia, jenis penyakit sistemik dan medikasi. Persepsi serostomia berhubungan dengan laju alir saliva. "
2016
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UI - Skripsi Membership  Universitas Indonesia Library
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"The aim of this research is to see the effect of various dentin conditioners (phosphoric acid) to the bond strength between resin adhesive HNPM/TEGDMA (2 Hydroxy-3,2-Napthoxy-Propyl Methacrylate/Trietilen Glikol di Methacrylate) and dentin tissue of bovine teeth. Dentin conditioner that was used are phosphoric acid solution 10%, 25%, 35% (Group A1, A2, A3). Specimens was divided into 3 Groups, each group has 10 specimens. Bond strength test used "Universal Testing Machine". A G 5000 and SHIMADZU type.
The result of this research shows average differences of bond strength of each group. Anova test there is a significant difference (8.485 and p < 0,05). Double comparison Tukey test among groups generally are significant different (p<0,05) except between A2 and A3 group. The result of the research states there are effects of various dentin conditioners to the bond strength between resin adhesive NHPM/TEGDMA and dentin tissue."
Jakarta: Journal of Dentistry Indonesia, 2003
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Artikel Jurnal  Universitas Indonesia Library
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Ayuna Ajeng Ratna
"Penelitian ini bertujuan untuk mengetahui pengaruh lama perendaman dalam saliva buatan terhadap perubahan pH-nya dan kekasaran permukaan resin komposit Giomer Bulk-Fill. Jumlah spesimen 63 buah dibagi dalam sembilan kelompok perlakuan yaitu perendaman dalam saliva buatan pH 7; 5,5; dan 4,5 selama masing-masing 1 jam, 24 jam, dan 72 jam pada suhu 370C. Perubahan pH saliva buatan diukur menggunakan pH meter dan pengujian kekasaran permukaan spesimen menggunakan surface roughness tester. Hasil menunjukkan bahwa terdapat perbedaan yang bermakna pada setiap kelompok perlakuan.

This study aimed to determine the effect of immersion time on artificial saliva pH changes and surface roughness of Giomer Bulk Fill composite resin. Sixty three specimens were divided into nine groups with immersion in artificial saliva pH 7, 5.5, and 4.5 for 1 hour, 24 hours, and 72 hours at 370C respectively. The changes in artificial saliva pH were measured using a pH meter and the surface roughness measured using surface roughness tester. The results showed that there were significant differences between each groups."
Jakarta: Fakultas Kedokteran Gigi Universitas Indonesia, 2016
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UI - Skripsi Membership  Universitas Indonesia Library
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Christhania Cornelius
"ABSTRAK
Resin komposit alkasit mampu melepaskan ion hidroksida sehingga dapat mempertahankan pH netral saliva. Ion yang dilepaskan lebih banyak pada suasana asam. Resin komposit alkasit dapat dipolimerisasi secara kimia dan/atau menggunakan sinar. Penelitian ini dilakukan untuk mengetahui kemampuan resin komposit alkasit polimerisasi kimia dan sinar dalam menetralkan saliva buatan. Jumlah spesimen 96 buah dibagi menjadi 16 kelompok perlakuan yang terdiri dari 2 kelompok saliva buatan (pH 4,5 dan 5,5), 2 kelompok metode polimerisasi (kimia dan sinar), dan 4 kelompok waktu perendaman (1, 3, 5, dan 7 hari). Spesimen berbentuk lempeng dengan diameter 15 mm dan tebal 1 mm yang direndam dalam 5 ml saliva buatan dan disimpan dalam inkubator bersuhu 37˚C. Hasil penelitian menunjukkan adanya peningkatan pH saliva buatan pada seluruh kelompok perlakuan seiring dengan waktu perendaman. Berdasarkan uji statistik Independent T test dan Mann Whitney U, secara umum tidak terdapat perbedaan bermakna dalam meningkatkan pH saliva buatan antara kelompok metode polimerisasi kimia dan sinar. Sedangkan, terdapat perbedaan bermakna kenaikan pH saliva buatan pada kelompok yang direndam pada saliva buatan pH 4,5 dan 5,5. Dapat disimpulkan bahwa kemampuan resin komposit alkasit polimerisasi kimia dan sinar sama baik dalam meningkatkan pH saliva buatan hingga hari ke 7, terutama dalam suasana yang lebih asam.

ABSTRACT
Alkasite composite resin is able to release hydroxide ions so it can maintain a neutral pH of saliva. More ions released in an acid condition. This composite resin can be polymerized chemically or using LED light. This study aimed to determine the ability of self-cured and light-cured alkasite composite resin to neutralize artificial saliva pH. Ninety-six specimens were immersed in 5 ml of artificial saliva, 15 mm in diameter and 1 mm thick were divided into 16 groups consist of 2 groups of artificial saliva (pH 4,5 and 5,5), 2 groups of polymerization method (self-cured and light-cured), and 4 groups of immersion time (1, 3, 5, and 7 days). The result showed that there was an increase in the pH of the artificial saliva in all treatment groups over the time of immersion. The statistical test using Independent T test and Mann Whitney U showed that in general there were no significant differences between the polymerization method. Meanwhile, there were significant differences between the groups that immersed in each artificial saliva pH. It was concluded that self cured and light cured composite resin alkasite have the same ability to increase the pH of artificial saliva until the 7th day, especially in an acid condition."
Jakarta: Fakultas Kedokteran Gigi Universitas Indonesia, 2019
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UI - Skripsi Membership  Universitas Indonesia Library
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Marisa Amini
"ABSTRAK
Dalam penggunaannya di rongga mulut, resin komposit dapat mengalami degradasi oleh asam, terutama pada pasien dengan resiko karies tinggi. Resin komposit alkasit merupakan material dual-cured yang berbasis UDMA dan mampu melepaskan ion fluor, kalsium, dan hidroksida. Adanya ion hidroksida yang dilepaskan diketahui dapat menetralkan suasana asam. Namun, belum diketahui bagaimana pengaruh pH saliva buatan terutama pH kristis hidroksiapatit dan fluoroapatit terhadap sifat kekerasan resin komposit alkasit. Penelitian ini dilakukan untuk melihat pengaruh pH saliva buatan terhadap kekerasan resin komposit alkasit polimerisasi kimia dan cahaya. Penelitian berupa eksperimental laboratorik dengan menggunakan masing-masing 48 spesimen resin komposit alkasit (Cention-N, Ivoclar-Vivadent, Liechstenstein) polimerisasi kimia dan cahaya. Spesimen berbentuk silindris dengan diameter 6 mm dan tinggi 2 mm yang dibagi menjadi 16 kelompok perendaman. Perendaman dilakukan pada pH saliva buatan 4,5 dan 5,5 dengan lama perendaman 1, 3, 5, dan 7 hari di dalam inkubator dengan suhu 37°C. Uji kekerasan menggunakan Knoop Microhardness Tester (HMV-G Shimadzu). Hasil penelitian menunjukkan adanya penurunan kekerasan pada resin komposit alkasit polimerisasi kimia dan cahaya setelah dilakukan perendaman selama 1, 3, 5, dan 7 hari dalam saliva buatan dengan pH 4,5 dan 5,5. Nilai kekerasan tertinggi terlihat pada resin komposit alkasit polimerisasi cahaya setelah perendaman 1 hari pada pH saliva buatan 5,5 yaitu 58,41±0,23 KHN. Sedangkan nilai kekerasan terendah terlihat pada resin komposit alkasit polimerisasi kimia setelah perendaman 7 hari pada pH saliva buatan 4,5 yaitu 47,38±0,49 KHN. Berdasarkan uji statistik One-way Anova terdapat perbedaan bermakna (p<0,05) antar kelompok lama perendaman pada pH saliva buatan 4,5 dan 5,5. Hasil uji statistik Independent T-test menunjukkan terdapat perbedaan bermakna (p<0,05) antar kelompok pH saliva buatan dan antar kelompok metode polimerisasi. Dapat disimpulkan bahwa terdapat penurunan nilai kekerasan resin komposit alkasit seiring dengan semakin rendahnya pH saliva buatan dan semakin lamanya perendaman dengan penurunan terbesar pada perendaman 1 hari pertama.

ABSTRACT
In its application in the oral cavity, composite resins can be degraded by acids, especially in patients with a high caries risk. Alkasite composite resin is a dual-cured material based on UDMA and capable of releasing fluoride, calcium, and hydroxide ions. The presence of hydroxide ion which released to its environtment can neutralize the acidic condition. However, it has not yet determined how saliva pH, especially the critical saliva pH for hydroxyapatite and fluoroapatite, affects the hardness properties of alkasite composite resins. The aim of this study was to determine the effect of artificial saliva pH on the hardness of self-cured and dual-cured alkasite composite resin. This laboratory study used 48 cylindrical-shaped specimens with 6 mm in diameter and 2 mm in thickness of alkasite composite resin specimens (Cention-N, Ivoclar-Vivadent, Liechstenstein) for each polymerization methods. The specimens were divided into 16 groups for immersion in artificial saliva pH 4.5 and 5.5 and then stored in an incubator at 37°C for the next 1, 3, 5, 7 days. The hardness test was performed using a Knoop Microhardness Tester (HMV-G Shimadzu). The results showed that the hardness of self-cured and dual-cured alkasite composite resins decreased after immersion. The highest hardness value was seen in dual-cured alkasite composite resin after 1 day immersion in artificial saliva pH of 5.5 (58.41 ± 0.23 KHN). While the lowest hardness value was seen in the self-cured alkasite composite resin after 7 days immersion in artificial saliva pH 4.5 (47.38 ± 0.49 KHN). Based on the One-way Anova statistical test, there were significant differences (p <0.05) between the different immersion time groups in each artificial saliva pH. The results of the Independent T-test statistical test showed that there were significant differences (p <0.05) between the artificial saliva pH groups and between polymerization methods groups. It was concluded that there was a decrease in the hardness of alkasite composite resin along with the lower pH of artificial saliva and the increasing immersion time. The greatest decrease occured in the first day of immersion."
Jakarta: Fakultas Kedokteran Gigi Universitas Indonesia, 2019
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UI - Skripsi Membership  Universitas Indonesia Library
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Fajar Nurrachman
"Tujuan: Penelitian ini bertujuan untuk mengetahui perbedaan nilai kekerasan resin komposit microhybrid G-aenial Posterior™ setelah perendaman dalam saliva buatan dengan pH 4,5; 5,5; dan 7 selama 1 hari dan 7 hari.Metode Penelitian: Dalam penelitian ini digunakan 36 spesimen resin komposit microhybrid G-aenial Posterior™ berbentuk silinder dengan ukuran diameter 6 mm dan tebal 2 mm. Selembar mylar strip diletakkan diatas permukaan resin komposit sebelum dilakukan proses curing. Polimerisasi dilakukan menggunakan Light Curing Unit (LED DBA iLed) selama 10 detik dengan irradiansi 1200 mW/cm2. Setelah polimerisasi, spesimen direndam dalam akuades pada suhu 37oC selama 24 jam. Spesimen dibagi menjadi enam kelompok (n = 6) yaitu; perendaman pada saliva buatan pH 4,5 selama 1 hari, saliva buatan pH 5,5 selama 1 hari, saliva buatan pH 7 selama 1 hari, saliva buatan pH 4,5 selama 7 hari, saliva buatan pH 5,5 selama 7 hari, dan saliva buatan pH 7 selama 7 hari. Spesimen diuji menggunakan HMV-G Series Micro Vickers Hardness Tester (Shimadzu, Jepang) dengan beban 50 gram selama 15 detik untuk mendapatkan nilai kekerasan. Data dianalisis dengan uji statistik One-Way ANOVA dan Post-Hoc Bonferroni. Hasil Penelitian: Hasil uji statistik menunjukkan penurunan bermakna nilai kekerasan material G-aenial PosteriorTM setelah dilakukan perendaman selama 1 dan 7 hari dalam saliva buatan dengan pH 4,5; 5,5; dan 7. Nilai kekerasan tertinggi terlihat pada resin komposit microhybrid G-aenial Posterior™ setelah perendaman 1 hari pada pH saliva buatan pH 7 yaitu sebesar 19,14 ± 0,61 VHN. Sedangkan nilai kekerasan terendah terlihat pada resin komposit microhybrid G-aenial Posterior™ setelah perendaman 7 hari pada pH saliva buatan pH 4,5 yaitu sebesar 14,37 ± 0,31 VHN. Kesimpulan: Disimpulkan bahwa dengan pertambahan waktu perendaman, dan penurunan pH saliva buatan didapatkan nilai kekerasan yang menurun pada resin komposit microhybrid G-aenial PosteriorTM.

Objective: The aim of this study was to determine the difference of Microhybrid G-Aenial Posterior™ Composite Resin hardness value after immersion in artificial saliva with pH 4.5; 5.5; and 7 for 1 day and 7 days. Method: 36 specimens of Microhybrid G-Aenial Posterior™ Composite Resin were used in this study. All materials were prepared into disk-shaped specimens of 6 mm in diameter and 2 mm in thickness. A piece of mylar strip was placed on the top of the specimens just before the polymerization. Polymerization was done using LED curing unit (LED DBA iLed) in 10 seconds with irradiance 1200 mW/cm2. After polymerization, specimens were immersed in 37C aquadest solution for 24 hours. Specimens were divided into six groups (n=6) immersed with artificial saliva pH 4,5 in a day; pH 5,5 in a day; pH 7 in a day; pH 4,5 in 7 days; pH 5,5 in 7 days; and pH 7 in 7 days. Specimens were tested with HMV-G Series Micro Vickers Hardness Tester (Shimadzu, Japan) with 50 gram indentation in 15 seconds. Data were analyzed using One-Way ANOVA and Post-Hoc Bonferroni to assess the significant differences among groups. Result: The result showed hardness significant decreased of G-aenial PosteriorTM after were immersed in 1 and 7 days in 4,5; 5,5; dan 7 pH of artificial saliva. The highest and lowest hardness value seen in microhybrid G-aenial Posterior™ composite resin after were immersed in one day with pH 7 of artificial saliva (19,14 ± 0,61 VHN) and 7 days with pH 4,5 (14,37 ± 0,31 VHN) respectively. Conclusion: It was concluded that the increased immersion time and the decrease in the pH value of the artificial saliva decreased the hardness value of the G-aenial PosteriorTM microhybrid composite resin."
Depok: Fakultas Kedokteran Gigi Universitas Indonesia, 2021
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UI - Skripsi Membership  Universitas Indonesia Library
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Rivandy Holil
"Latar Belakang: Dalam dunia kedokteran gigi, terdapat banyak pilihan material restoratif yang dapat digunakan, salah satunya yaitu resin komposit. Seiring dengan perkembangan teknologi, para peneliti berhasil mengembangakan resin komposit baru yaitu Bulk-Fill. Sebagai contoh adalah resin komposit Giomer Bulk-Fill yang memiliki berbagai sifat seperti sifat mekanik, fisis dan biologis. Namun, belum ada penelitian pada resin komposit Giomer Bulk-Fill yang secara spesifik menguji nilai kekuatan tarik diametral yang merupakan salah satu sifat mekanik material restoratif.
Tujuan Penelitian: Penelitian ini bertujuan untuk mengetahui pengaruh lama perendaman 1, 24, dan 72 jam serta perbedaan nilai pH saliva buatan 7; 5,5; dan 4,5 terhadap kekuatan tarik diametral resin komposit Giomer Bulk-Fill.
Metode: Penelitian eksperimental laboratorik dengan menggunakan 90 spesimen berbentuk silindris pejal dengan diameter 6 mm dan tinggi 3 mm yang diuji menggunakan Universal Testing Machine (Shimadzu AGS-X 5kN, Japan) dan dibagi ke dalam 3 kelompok pH larutan saliva buatan yaitu 7; 5,5; dan 4,5; serta 3 kelompok lama perendaman yaitu 1, 24, dan 72 jam.
Hasil: Hasil pengujian menggunakan uji One-way ANOVA menunjukkan adanya perbedaan bermakna pada spesimen-spesimen yang digunakan (p<0,05). Pada kelompok spesimen yang direndam dalam larutan saliva buatan dengan pH 7, hasil rerata kekuatan tarik diametral pada perendaman selama 1 jam adalah sebesar 36,7 ± 2,7 MPa. Kemudian mengalami penurunan setelah perendaman 24 jam dengan rerata nilai kekuatan tarik diametralnya sebesar 35,2 ± 2,2 MPa dan meningkat kembali setelah perendaman 72 jam dengan hasil rerata kekuatan tarik diametralnya sebesar 40,1 ± 3,6 MPa. Pada kelompok spesimen yang direndam dalam larutan saliva buatan dengan pH 4,5, pada perendaman selama 1 jam hasil rerata kekuatan tarik diametralnya sebesar 33,6 ± 2,4 MPa. Kemudian setelah perendaman 24 jam dan 72 jam meningkat menjadi 42,6 ± 2 MPa dan 44,2 ± 2,8 MPa. Pada kelompok spesimen yang direndam dalam larutan saliva buatan dengan pH 5,5, hasil rerata kekuatan tarik diametral setelah perendaman selama 1 jam adalah sebesar 34 ± 2,4 MPa. Namun, terjadi perbedaan jika dibandingkan dengan kelompok pH 4,5 yaitu pada kelompok dengan pH 5,5 pada lama perendaman 24 jam terjadi peningkatan yaitu sebesar 44,7 ± 2,8 MPa kemudian menurun setelah perendaman 72 jam dengan nilai rerata sebesar 39 ± 3,3 MPa.
Kesimpulan: Nilai kekuatan tarik diametral resin komposit Giomer Bulk-Fill tidak dipengaruhi oleh pH saliva buatan 4,5; 5,5; dan 7 yang digunakan di dalam penelitian ini. Nilai kekuatan tarik diametral resin komposit Giomer Bulk-Fill yang direndam selama 1, 24, dan 72 jam di dalam saliva buatan dengan pH 4,5; 5,5; dan 7 secara umum mengalami peningkatan sehingga lama perendaman dalam penelitian ini mempengaruhi nilai kekuatan tarik diametral resin komposit Giomer Bulk-Fill.

Background: In the world of dentistry, there are many choices of restorative materials that can be used, one of them is composite resin. Along with the development of technology, the researchers succeeded in developing a new composite resin called Bulk-Fill. One example is Giomer Bulk-Fill composite resin which has various properties such as mechanical, physical and biological properties. However, there is no research on Giomer Bulk-Fill composite resin which specifically tests the value of diametral tensile strength which is one of the mechanical properties of restorative material.
Objective: This study aims to determine the effect of immersion time and the difference in pH value 7; 5,5; and 4,5 of the artificial saliva solution on the value of diametral tensile strength of Giomer Bulk-Fill composite resin.
Method: Laboratory experimental research using 90 solid cylindrical specimens with a diameter of 6 mm and a height of 3 mm which were tested using Universal Testing Machine (Shimadzu AGS-X 5kN, Japan) and were divided into 3 groups pH of artificial saliva solution (7; 5.5; and 4.5) and 3 groups of immersion periods (1, 24 and 72 hours).
Results: The test results using the One-way ANOVA test showed significant differences in the specimens used (p <0.05). In the group of specimens which were immersed in artificial saliva solution with pH 7, the results of the average diametral tensile strength at immersion for 1 hour were 36.7 ± 2.7 MPa. Then it decreased for 24 hours immersed time with a mean value of diametral tensile strength of 35.2 ± 2.2 and increased again at 72 hours immersed time with an average value of diametral tensile strength 40.1 ± 3.6 MPa. In the group of specimens which were immersed in artificial saliva solution with pH 4.5, at immersion for 1 hour the average value of diametral tensile strength was 33.6 ± 2.4 MPa. Then in 24-hour and 72-hour immersion, it increased to 42.6 ± 2 MPa and 44.2 ± 2.8 MPa. In the group of specimens immersed in artificial saliva solution with a pH of 5.5, the average value of diametral tensile strength for 1 hour was 34 ± 2.4 MPa. However, there was a difference when compared to the pH 4.5 group, which was in the group with a pH of 5.5 in the 24-hour immersion period, the value increase for 44.7 ± 2.8 MPa and then decreased for 72 hours of immersion with an average value of 39 ± 3.3 MPa.
Conclusion: The value of diametral tensile strength of Giomer Bulk-Fill composite resin is not affected by pH of artificial saliva 4.5; 5.5; and 7 that used in this study. The value of diametral tensile strength of Giomer Bulk-Fill composite resin, which is immersed for 1, 24, and 72 hours in artificial saliva with pH 4.5; 5.5 and 7 generally increased so that the immersion time in this study affected the diametral tensile strength of Giomer Bulk-Fill composite resin.
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Jakarta: Fakultas Kedokteran Gigi Universitas Indonesia, 2018
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"Objectives. The aim of this study was to compare the fracture toughness of a microhybrid and a flowable microhyrid resin composites. Methods. Test specimens (30x15x2)mm made of a
microhybrid and a flowable microhybrid were prepared in a double torsion mould and were then polymerized for 20 seconds using a light-curing device. Taken out from the mould, the specimens were than soaked in disfilled water (37°C) for 1 hour and then fractured in a double-torsion technique. t-Test was used to test significance difference between the microhybrid and flowable microhybrid resin composites. Result. The use of double-torsion technique resulted in crack initition and crack arrest which revealed Klc of 1.14 MN/m3/2 and 1.045 MN/m3/2 for the microhybrid and the flowable microhybrid resin composites, respectively. Both resin composites were insignificantly different in the fracture toughness values showed by t–Test. Conclusions. The present study suggested that there was no significant difference between the microhybrid and the flowable microhybrid resin composites tested. It appreared that filler fraction might not affect the fracture toughness of the resin composties tested.
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[Fakultas Kedokteran Gigi Universitas Indonesia, Journal of Dentistry Indonesia], 2009
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Artikel Jurnal  Universitas Indonesia Library
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