Widjijono Widjijono
Universitas Gadjah Mada Yogyakarta

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Mechanical properties of carving wax with various Ca-bentolite filter composition Widjijono, Widjijono; Agustiono, Purwanto; Irnawati, Dyah
Dental Journal (Majalah Kedokteran Gigi) Vol 42, No 3 (2009): (September 2009)
Publisher : Faculty of Dental Medicine, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (223.079 KB) | DOI: 10.20473/j.djmkg.v42.i3.p114-117

Abstract

Background: The carving wax is used as a medium in dental anatomy study. This wax composes of many waxes and sometimes a filler is added. Carving wax is not sold in Indonesian market. Whereas the gradients of carving wax such as beeswax, paraffin and bentonite are abundant in Indonesia. Based on that fact, to make high quality and standard,the exact composition if this carving wax should be known. Purpose: The aim of this study was to investigate the effect of carving wax composition with Ca-bentonite filler on the melting point, hardness, and thermal expansion. Methods: Five carving wax compositions were made with paraffin, Ca-bentonite, carnauba wax, and beeswax in ratio (% weight): 50:20:25:5 (KI), 55:15:25:5 (KII), 60:10:25:5 (KIII), 65:5:25:5 (KIV), 70:0:25:5(KV). All components were melted, then poured into the melting point, hardness, and thermal expansion moulds (n = 5). Three carving wax properties were tested: melting point by melting point apparatus; hardness by penetrometer; thermal expansion by digital sliding caliper. The data were analyzed statistically using One-Way ANOVA and LSD0.05. Result: The Ca-bentonite addition influenced the melting point and thermal expansion of carving wax with significant differences between KI and other groups (p < 0.05). Ca-bentonite addition influenced the carving wax hardness and the mean differences among the groups were significant (p < 0.05). Conclusion: Ca-bentonite filler addition on the composition of carving wax influenced the physical and mechanical properties. The carving wax with high Ca-bentonite concentration had high melting point and hardness, but low thermal expansion.
The effect of monofluorophosphate implant in white rat mothers towards the level of fluor in the incisors of their young babies (Rattus-rattus) Widjijono, Widjijono
Dental Journal (Majalah Kedokteran Gigi) Vol 43, No 2 (2010): (June 2010)
Publisher : Faculty of Dental Medicine, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (190.255 KB) | DOI: 10.20473/j.djmkg.v43.i2.p72-75

Abstract

Background: Fluoride has been widely used in the prevention of dental caries for a long time. To prevent dental caries, fluoride must be induced in low amount at high frequency. Inducing it through implantation process even make slow release of small concentration of fluoride. Purpose: The aim of this research was to analyze whether the induction of monofluorophosphate (MFP) implant into the white rat mothers affects the level of fluoride in the incisors of their young babies. Method: The objects of the research were twenty white rat mothers in two days of pregnancy which then were divided into four groups (n=5). First, those mothers have been induced with implant under their back skin until their born young babies in the age of 35 days (n=5). The level of fluoride in the incisors of those young babies then is measured with Potentiometer. The obtained data were finally analyzed with One-Way ANOVA test and continued by with LSD test (p=0.05). Result: The result of this research showed that the means of the fluoride level in the incisors of those babies divided into those four groups in series were about 11956.16±201.35 ppb (K), 27328.04±234.56 ppb (P1), 37267.21±248.86 ppb (P2), and 18103.50±267.11 ppb (P3). The result of ANOVA test then showed that the induction of various MFP implant levels significantly affected the level of fluoride in the incisors of the babies. The mean differences among the treatment groups after being tested with LSD 0.05 were also significant. Conclusion: The finding confirm that the significant increasing of the optimal fluoride retention in the incisors of white rat babies can be achieved with the induction of fluoride with MFP ions implant in about 52.98 mg.Latar belakang: Pencegahan karies gigi menggunakan senyawa fluor telah banyak dilakukan dan berlangsung dalam jangka waktu lama. Pemberian fluor dalam jumlah rendah dan frekuensi tinggi merupakan pemenuhan kebutuhan pencegahan karies gigi. Pemberian dengan cara implantasi memberikan keluaran fluor jumlah kecil dan waktu lama. Tujuan: Penelitian ini bertujuan untuk mengetahui apakah induk tikus yang diberi implan-MFP berpengaruh terhadap kandungan fluor gigiseri anak tikus. Metode: Subjek penelitian adalah 20 ekor induk tikus putih bunting 2 hari dibagi 4 kelompok (n=5). Induk diberi implan pada bawah-kulit punggung hingga anak tikus lahir dan pada umur 35 hari (n=5). Kandungan fluor pada gigi seri anak tikus diukur menggunakan Potensiometer. Data yang diperoleh dianalisis dengan Anova 1 jalur dilanjutkan uji LSD (p=0,05). Hasil: penelitian menunjukkan rerata fluor gigiseri anak tikus berturut-turut sebesar: 11956,16±201,35 ppb (K), 27328,04±234.56 ppb (P1), 37267,21±248.86 ppb (P2), dan 18103,50±267,11 ppb (P3). Hasil: Anava membuktikan bahwa ada pengaruh bermakna akibat variasi kadar MFP dalam implan terhadap kandungan fluor gigi anak tikus. Beda rerata antar kelompok perlakuan diuji dengan LSD0,05 memperlihatkan perbedaan bermakna pada semua kelompok. Kesimpulan: Penelitian dapat disimpulkan bahwa kenaikan secara bermakna terhadap retensi fluor optimal dalam gigiseri tikus putih pada pemberian fluoridasi menggunakan implan dengan muatan MFP: 52,98 mg.
Effect of Copper (II) Chloride Concentration towards Copper Ions Sorption on Natural Zeolite from Wonosari Irnawati, Dyah; Widjijono, Widjijono; Wijaya, Karna; Asmara, Widya
The Indonesian Journal of Dental Research Proceeding Book
Publisher : The Indonesian Journal of Dental Research

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Abstract

Copper-containing zeolite has been developed as an antibacterial material. It is obtained by reacting zeolite and salt solution with varied concentration of copper. Natural zeolite is abundant in Wonosari, Yogyakarta. The aim of this research was to investigate the concentration effect of copper (II) chloride solutions towards copper ions sorption on natural zeolite from Wonosari. Copper (II) chloride dihydrate powders, CuCl2. 2H2O, (Merck, Germany) and natural zeolite (Wonosari, Indonesia) were used. Zeolite powder (100 mesh) was washed and dried (200oC/2 hours). Copper (II) chloride solution with different concentrations (0.05 M, 0.10 M, 0.15 M, 0.20 M, and 0.25 M) were prepared. Zeolite and CuCl2 solutions (50 g/250 ml) were reacted at 60oC for 1 hour (n=5). The solutions were filtered, washed, and dried (100oC/24 hours). Copper ions amount were measured by XRF (Canberra Inc., USA). The data were analyzed by one way Anova. Mean values (% weight) of copper ions amount were 0.441 ± 0.029 % (0.05 M group), 0.588 ± 0.027 % (0.10 M group), 0.657 ± 0.014 % (0.15 M group), 0.676 ± 0.037 % (0.20 M group), and 0.737 ± 0.039 % (0.25 M group). The Anova showed that CuCl2 concentration influenced copper ions amount significantly (p&lt;0.01). The differences among the groups were significant, except between 0.15 M and 0.20 M groups (p&gt;0.05). Copper (II) chloride concentration influenced the copper ions sorption on natural zeolite from Wonosari. The 0.25M CuCl2 solution gave the highest copper ions amount.
Pengaruh Kombinasi Posisi Fiber Terhadap Kekuatan Fleksural dan Ketangguhan Retak Fiber Reinforced Composite Polyethylene Widyapramana, Widyapramana; Widjijono, Widjijono; Sunarintyas, S.
Insisiva Dental Journal Vol 2, No 2 (2013)
Publisher : Insisiva Dental Journal

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Abstract

Kehilangan gigi akibat karies, trauma, kondisi sistemik dan penyakit periodontal, dapat menyebabkan gangguan fungsional terutama pada saat digunakan untuk pengunyahan. Restorasi gigi tiruan cekat (GTC) secara direct yang menggunakan material komposit dengan penguatan fiber sering disebut sebagai fiber reinforced composite (FRC). UHMWPE merupakan non-impregnated polyethylene fiber yang mempunyai kekuatan fleksural lebih baik dari Pre-impregnated glass fiber. Penelitian ini bertujuan untuk mengetahui pengaruh kombinasi posisifiber terhadap kekuatan fleksural dan ketangguhan retak (fracture toughness) FRC UHMWPE. Penelitian ini merupakan jenis penelitian eksperimental laboratoris. Bahan penelitian menggunakan fiber Polyethylene (Construct, Kerr, USA) lebar 2mm, resin komposit flowable (Filtek Z350 XT 3M ESPE, USA), silane (RelyX 3M ESPETMSil, Germany). Sampel dalam penelitian ini adalah batang polyethylene fiber reinforced composite (FRC) dengan ukuran 2 x 2 x 25 mm terbagi dalam 3 kelompok kombinasi posisi fiber. Kelompok pertama adalah kombinasi posisi compression – neutral, kelompok kedua posisi neutral – tension dan kelompok ketiga posisi compression – tension dengan jumlah total sampel adalah 18. Sampel FRC diuji dengan menggunakan universal testing machine untuk mengetahui kekuatan fleksural (Mpa) dan ketangguhan retak/fracture toughness (MPa-m1/2). Perbedaan pengaruh diukur menggunakan analisis data Anova 1 jalur dan LSD (p&lt;0,05). Hasil uji statistik pada sampel FRC menunjukkan terdapat pengaruh perbedaan yang bermakna pada semua sampel yangdiuji p=0,00. Sampel batang polyethylene fiber reinforced composite (FRC) dengan kombinasi posisi compression – tension memiliki kekuatan fleksural 189 MPa dan ketangguhan retak 91,08 MPa-m1/2 tertinggi dibandingkan dengan kelompok sampel yang lainnya. Terdapat pengaruh perbedaan kombinasi posisi fiber polyethylene pada sampel FRC UHMWPE terhadap kekuatan fleksural dan ketangguhan retak (fracture toughness). Berdasarkan hasil uji sampel tersebut dapat dikatakan bahwa kombinasi posisi fiber compressiontension pada aplikasi gigi tiruan cekat (GTC) dapat memberikan kekuatan fleksural 189 Mpa yang optimal dan mendekati rerata tekanan pengunyahan sebesar 193 Mpa.
Pengaruh Penambahan Polyethylene Fiber Dan Serat Sisal Terhadap Kekuatan Fleksural Dan Impak Base Plate Komposit Resin Akrilik Hadianto, Eko; Widjijono, Widjijono; Herliansya, M.K.
Insisiva Dental Journal Vol 2, No 2 (2013)
Publisher : Insisiva Dental Journal

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Abstract

Resin Akrilik Menjadi Pilihan Untuk Pembuatan Gigi Tiruan Lepasan Karena Harganya Relatif Murah, Mudah Direparasi Dan Proses Pembuatan Mudah. Kelemahan Resin Akrilik Adalah Terbatasnya Terhadap Kekuatan Fleksural Dan Impak. Tujuan Dari Penelitian Ini Adalah Untuk Mengetahui Pengaruh Penambahan Polyethylene Fi ber Dan Serat Sisal Dengan Konsentrasi 1,6% Berat Terhadap Kekuatan Fleksural Dan Impak Basis Gigi Tiru an Resin Akrilik. Penelitian Ini Menggunakan Resin Akrilik Kuring Panas Merek Qc 20 Dengan Ukuran 65x10x2,5 Mm Untuk Uji Fleksural Dan 65x10x8 Mm Untuk Uji Impak. Sampel Penelitian Masing-Masing Terbagi Menjadi 3 Kelompok, Setiap Kelompok Terdiri Dari 4 Subyek. Kelompok I Tanpa Penambahan Fiber, Kelompok Ii Dengan Penambahan Polyethylene Fiber, Kelompok Iii Dengan Penambahan Serat Sisal. Seluruh Plat Resin Akrilik Direndam Di Dalam Air Destilasi Selama 24 Jam Pada Suhu 370c. Pengujian Kekuatan Fleksural Menggunakan Universal Testing Machine Dan Pengujian Kekuatan Impak Menggunakan Metode Charpy. Analisis Data Menggunakan One Way Anova Dengan Tingkat Kepercayaan 95% (Α=0,05) Dan Analisis Lsd. Hasil Penelitian Menunjukkan Rerata Kekuatan Fleksural (Mpa) Tanpa Penambahan Fiber (109,79±5,93);Penambahan Polyethylene Fiber (134,18 ±3,80); Serat Sisal (170,15±5,50). Pada Kekuatan Impak (Kj/M2) Tanpa Penambahan (4,45±1,95) Penambahan Polyethylene Fiber (60,79±26,49); Penambahan Serat Sisal (16,23±3,02). Hasil Analisis One Way Anova Menunjukkan Pengaruh Bermakna Akibat Penembahan Fiber Terhadap Kekuatan Fleksural Dan Impak Base Plate Resin Akrilik (P&lt;0,05). Analisis Lsd Menunjukkan Perbedaan Bermakna Rerata Kekuatan Fleksural Antar Kelompok (P&lt;0,05). Pada Hasil Uji Impak Menunjukkan Bahwa Rerata Kelompok Tanpa Fiber Berbeda Bermakna Dengan Kelompok Dengan Penambahan Fiber (P&lt;0,05), Dan Antara Kelompok Penambahan Polyethylene Fiber Dengan Penambahan Serat Sisal Tidak Berbeda Bermakna. Kesimpulan Dari Penelitian Ini Adalah Terdapat Peningkatan Kekuatan Fleksural Dan Impak Base Plate Komposit Resin Akrilik Pada Penambahan Polyethylene Fiber Dan Serat Sisal. Base Plate Dengan Penguat SeratSisal Memiliki Rerata Kekuatan Fleksural Paling Tinggi, Sedangkan Base Plate Dengan Penguat Polyethylene Fi ber Memiliki Rerata Kekuatan Impak Tertinggi.
Pengaruh posisi dan fraksi volumetrik fiber polyethylene terhadap kekuatan fleksural fiber reinforced composite (The effect of position and volumetric fraction polyethylene fiber on the flexural strength of fiber reinforced composite) Septommy, Catur; Widjijono, Widjijono; Dharmastiti, Rini
Dental Journal (Majalah Kedokteran Gigi) Vol 47, No 1 (2014): (March 2014)
Publisher : Faculty of Dental Medicine, Universitas Airlangga

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (433.54 KB) | DOI: 10.20473/j.djmkg.v47.i1.p52-56

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Background: Composite resin is a combination of filler and matrix. The additional of fiber in the composite resin has a function as load-bearing in mastication. Polyethylene fiber has been used as a reinforced to receive the forces on the fixed denture fiber reinforced composite (FRC). Purpose: The purpose of this study was to determine effect of position and olumetric fraction of fibers on the flexural strength and modulus polyethylene FRC. Methods: This study used 7 groups with variations in the position and the volume of fiber. Group I, position compression volume 1 sheet; group II, 2 volume compression sheet position; group III, volume 1 sheet neutral position; group IV, neutral position volume 2 sheets; group V, position tension volume 1 sheet; group VI position tension volume 2 sheets; and group VII without fiber. Each group consisted of 6 samples and FRC rod-shaped samples with size (25 x2 x 2) mm. Samples were tested by three-point bending test with a universal testing machine. The data were analyzed by two-way Anova and LSD test continued (α = 0,05). Results: Group VI had the highest mean flexural strength than others (360.74 MPa) and group IV had the highest flexural modulus than others (3.56 GPa). The flexural strength and modulus with the variation of position or volume showed a significant differences (p<0.05), while the interaction between position and volume showed no significant difference (p>0.05). Conclusions: The position fiber on tension and additional two strips on volumetric fiber affected the increasing flexural strength and modulus of FRC.Latar belakang: Komposit merupakan gabungan filler dan matriks. Penambahan fiber pada komposit berfungsi sebagai penahan beban pengunyahan. Polyethylene fiber telah digunakan sebagai penguat dalam menerima gaya-gaya pada gigi tiruan cekat fiber reinforced composite (FRC). Tujuan: Penelitian ini bertujuan untuk mengetahui pengaruh posisi dan fraksi volumetrik fiber pada kekuatan fleksural polyethylene FRC. Metode: Penelitian ini membuat 7 kelompok sampel polyethylene FRC dengan variasi posisi dan volume fiber. Kelompok I, posisi compression volume 1 lembar; kelompok II, posisi compression volume 2 lembar; kelompok III, posisi netral volume 1 lembar; kelompok IV, posisi netral volume 2 lembar; kelompok V, posisi tension volume 1 lembar; kelompok VI, posisi tension volume 2 lembar; dan kelompok VII, tanpa fiber. Setiap kelompok terdiri atas 6 sampel dan sampel berbentuk batang FRC dengan ukuran (25x2x2) mm. Sampel diuji dengan three-point bending test dengan universal testing machine. Data dianalisis dengan two-way anova dan dilanjutkan uji LSD (α=0.05). Hasil: Rerata kekuatan fleksural kelompok VI paling tinggi (360.74 MPa) dan kelompok IV memiliki modulus fleksural tertinggi (3.56 GPa). Kekuatan dan modulus fleksural dengan variasi posisi atau volume menunjukkan perbedaan bermakna (p<0.05) sedangkan interaksi antara posisi dan volume menunjukkan perbedaan tidak bermakna (p>0.05). Simpulan: Posisi fiber pada sisi tension FRC dan penambahan volume 2 lembar fiber akan meningkatkan kekuatan fleksural FRC.
Pengaruh Jenis dan Volumetrik Fiber terhadap Kekuatan Transversal Reparasi Plat Resin Akrilik Aditama, Pramudya; Sunarintyas, Siti; Widjijono, Widjijono
Majalah Kedokteran Gigi Indonesia Vol 1, No 1 (2015): August
Publisher : Faculty of Dentistry, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (258.885 KB) | DOI: 10.22146/majkedgiind.9021

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Resin akrilik merupakan bahan yang sering digunakan dalam pembuatan basis gigi tiruan. Kelemahan resin akrilik adalah mudah patah. Salah satu cara untuk mengatasi masalah tersebut adalah dengan menambahkan polyethylene (PE) atau glass fiber. Tujuan dari penelitian ini untuk mengetahui pengaruh jenis dan volumetrik fiber terhadap kekuatan transversal reparasi plat resin akrilik. Penelitian ini menggunakan dua puluh lima plat resin akrilik kuring panas berukuran 65 x 10 x 2,5 mm. Subjek dipreparasi untuk membuat jarak 3 mm dan sudut bevel 45o. Subjek dibagi menjadi 5 kelompok, masingmasing kelompok terdiri dari 5 subjek. Kelompok 1 (kontrol) tanpa penambahan fiber, kelompok II dengan penambahan 3,7% v/v PE fiber, kelompok III dengan penambahan 7,4% v/v PE fiber, kelompok IV dengan penambahan 3,7% v/v E-glass fiber, dan kelompok V dengan penambahan 7,4% v/v E-glass fiber. Seluruh plat direndam dalam air destilasi selama satu hari pada suhu 37oC. Pengujian kekuatan transversal plat resin akrilik dengan menggunakan Universal Testing Machine dan data yang didapat dianalisis menggunakan ANAVA dua jalur dengan tingkat kepercayaan 95%. Rerata kekuatan transversal (MPa) reparasi plat resin akrilik yang diperkuat fiber: 3,7% v/v PE fiber (67,77±3,34); 7,4% v/v PE fiber (80,37±8,42); 3,7% v/v E-glass fiber (96,72±5,43); 7,4% v/v E-glass fiber (109,44±4,98); sedangkan reparasi plat resin yang tidak diperkuat fiber menghasilkan kekuatan transversal 56,27±4,7 MPa. Hasil analisis menggunakanANAVA dua jalur menunjukkan variabel jenis dan volumetrik fiber memberikan pengaruh signifikan (p<0,05), sedangkan interaksi antara jenis dan volumetrik fiber tidak berpengaruh signifikan (p>0,05). Uji post hoc Tukey menunjukkan perbedaan signifikan (p<0,05) untuk seluruh kelompok perlakuan. Penambahan E-glass fiber dalam reparasi plat resinakrilik mampu meningkatkan kekuatan transversal lebih tinggi dibandingkan dengan menggunakan PE fiber. Peningkatan volumetrik fiber dapat meningkatkan kekuatan transversal reparasi plat resin akrilik. Effect Of Type And Volumetric Fiber On Transverse Strength Of Acrylic Resin Plate Repair. Acrylic resin is the most common denture base material. A disadvantage of acrylic resin is that it is easily fractured. One way to resolve this problem is by adding polyethylene (PE) or glass fibers. The purpose of this research is to find out about the effect of type and volumetric fiber on transverse strength of acrylic resin plate repaired. The experiment involved twenty five plates of heat cured acrylic with the dimensions of 65 x 10 x 2.5 mm. The speciments were prepared to create a 3 mm gap and 45° bevel. The subjects were divided into 5 groups; each group consisted of 5. Group I (control) was without fiber reinforcement, group II reinforced with 3.7% v/v PE fiber, group III reinforced with 7.4% v/v PE fiber, group IV reinforced with 3.7% v/v E-glass fiber, and group V reinforced with 7.4% v/v E-glass fiber. All plates were soaked in distilled water for one day at 37° C temperature. The plates were tested for transverse strength with Universal Testing Machine and all data obtained were analyzed with two way ANOVA at 95% confidence level. The mean of transverse strength (MPa) of the acrylic resin plate repair reinforced with fiber: 3.7% v/v PE fiber was (67.77±3.34); 7.4% v/v PE fiber (80.37±8.42); 3.7% v/v E-glass fiber (96.72±5.43); 7.4% v/v E-glass fiber (109.44±4.98); while the transverse strength of the acrylic resin plate with no fiber reinforced was 56.27±4.7 MPa. Two way ANOVA analysis shows that type and volumetric fiber had significant effect (p<0.05), while the interaction between type and volumetric fiber had no significant effect (p>0.05). Tukey post hoc test shows significant difference (p<0.05) for all groups. The addition of E-glass fibers in the acrylic resin plate repaired increased the transverse strength higher than that with PE fibers. The increase in volumetric fibers might improve the transverse strength of the acrylic resin plate repaired.
PENGARUH JENIS DAN LAMA PERENDAMAN NON DENTAL GLASS FIBER REINFORCED COMPOSITE TERHADAP SITOTOKSISITAS SEL FIBROBLAS Murdiyanto, Dendy; Widjijono, Widjijono; Nuryono, Nuryono
B-Dent: Jurnal Kedokteran Gigi Universitas Baiturrahmah Volume 2, Nomor 1, Juni 2015
Publisher : Universitas Baiturrahmah

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (93.801 KB) | DOI: 10.33854/JBDjbd.13

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Perawatan di kedokteran gigi mulai menggunakan material fiber reinforced composite (FRC) sebagai bahan penyusun alat-alat tertentu seperti gigi tiruan cekat, restorasi onlay, splinting gigi goyah, pasak gigi dan space maintainer. Penyusun FRC terdiri dari fiber dengan jenis terbanyak glass fiber dan matriks berupa dental composite. Non dental glass fiber merupakan jenis glass fiber yang digunakan pada pembuatan gypsum, patung dan alat-alat otomotif yang mudah dijumpai di pasaran dengan harga terjangkau. Tujuan penelitian ini adalah untuk mengetahui potensi sitotoksisitas jenis dan lama perendaman non dental glass fiber reinforced composite terhadap sel fibroblas yang mati. Penelitian ini menggunakan FRC yang diperkuat oleh 3 jenis non dental glass fiber I, II, III dan dental E-glass fiber sebagai pembanding. Uji sitotoksisitas dilakukan dengan methyl tetrazolium test (MTT) menggunakan sel vero terhadap air hasil rendaman FRC selama 1, 4, 7 dan 10 hari masing-masing 6 pengulangan sampel tiap kelompok. Jumlah sel yang mati menunjukkan tingkat sitotoksisitas dan kemudian dianalisa dengan Anava dua jalur (α = 0,05).Hasil penelitian menunjukkan rata-rata kematian sel tertinggi yaitu 8,55 ± 0,27 % pada FRC III dengan lama perendaman 10 hari, sedangkan rata-rata kematian sel terendah yaitu 8,48 ± 0,35 % pada dental glass fiber dengan lama perendaman 1 hari. Berdasarkan pedoman dari Sjögren bahan tidak bersifat sitotoksis jika kematian sel masih dibawah 10%. Uji Anava dua jalur menunjukkan bahwa jenis non dental glass fiber reinforced composite dan lama perendaman mempunyai pengaruh tidak bermakna (p>0,05) terhadap sitotoksisitas sel fibroblas. Kesimpulan hasil penelitian yaitu non dental glass fiber reinforced composite tidak bersifat sitotoksis terhadap sel fibroblas, jenis non dental glass fiber reinforced composite dan lama perendaman tidak berpengaruh terhadap sitotoksisitas sel fibroblas
Effect of glass fiber non-dental’s length and position on the flexural strength of FRC Maharani, Adella Syvia; Widjijono, Widjijono; Wahyuningtyas, Endang
Majalah Kedokteran Gigi Indonesia Vol 5, No 1 (2019): April
Publisher : Faculty of Dentistry, Universitas Gadjah Mada

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (326.898 KB) | DOI: 10.22146/majkedgiind.40074

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Glass fiber non-dental has a similar composition to E-glass fiber dental that commonly used as fiber reinforced composite (FRC) materials in resin bonded prosthesis. Fiber effectiveness can be determined by the length and the position. The aim of this study was to examine the effect of glass fiber non dental?s length and position on the flexural strength of FRC in resin bonded prosthesis. This study has been done used 36 FRC samples with beam shaped (15 mm x 2 mm x 2 mm). Fiber reinforced composite  samples were consisted of 9 groups (a combination between length: 4 mm, 6 mm, and 12 mm and position: compression, neutral, tension zone). The flexural strength was tested by universal testing machine and statistically analyzed using two-way ANOVA (p<0.05). The result showed that the lowest (compression, 4 mm) and the highest (tension, 12 mm) flexural strength were 104.30 ± 13.90 MPa and 166.18 ± 8.59 MPa. The two-way ANOVA test showed that variation of position, length, and interaction between placement-length had a significant effect on the flexural strength (p<0.05). The conclusion of this study was fiber position on compression zone with 4 mm length had the lowest flexural strength. In addition, fiber position on tension zone with 12 mm length had the highest flexural strength. 
Pengaruh Lama Perendaman Fiber Reinforced Composite dengan Fiber Sisal (Agave sisalana) Terkalissai dalam Saliva Buatan Terhadap Perubahan Dimensi Wibowo, Diva Agrita Dentisia; Widjijono, Widjijono; Siswomihardjo, Widowati
Jurnal Material Kedokteran Gigi Vol 7 No 1 (2018): JMKG Vol 7 No 1 Maret 2018
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (290.909 KB) | DOI: 10.32793/jmkg.v7i1.277

Abstract

Fiber reinforced composite is a material composed of matrix and reinforced by fiber. Fiber sisal is a natural fiber an alternatives synthetic fiber developed as dental material. Resin composite matrix is a hydrophilic substance that cause dimensional change. Alkalization of sisal fiber reduces the ability of hydrophilic sites which affects the dimensional changes. The aim of this study was to determine how different period of immersion affect dimensional change in samples. The samples used in this research were FRC made from flowable resin composite (Master Flow, Brazil), and alkalized sisal fiber. The samples were shaped into cuboid measuring 25x2x2 mm. Fiber was placed in the middle of sample with continuous unidirectional direction and then irradiated for 20 seconds using LCU. A total of 16 samples were divided to 4 groups, each group with the&nbsp; different period of immersion 0, 7, 14 and 21 days respectively. Dimensional changes were measured by the final dimension minus the initial dimension. Dimensional change was measured by the length, width, and height using digital sliding caliper with 0.001 mm nonius. The samples were immersed in the artificial saliva with pH 7. The data was analyzed using one way Anova and followed by LSD0.05. The result shows the mean value and standard deviation of dimensional changes with period of immersion at 0, 7, 14 and 21 days were 0.264±0.085, 2.856±0.089, 4.417±0.115 and 4.294±0.087 mm3. The F&nbsp; value &nbsp;obtained from one way Anova was 1.640±103 and the significance was 0.001 (p&lt;0.05), indicated a significance difference. LSD presented a significance difference of mean to all treat,ent except for 14th and 21th day. This study concluded that various period of immersion increase effect to the dimensional changes of FRC with alkalized fiber sisal.