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All Journal Dentika Dental Journal Jurnal Teknosains The Indonesian Journal of Dental Research Majalah Kedokteran Gigi Indonesia ODONTO Dental Journal Insisiva Dental Journal : Majalah Kedokteran Gigi Insisiva Mutiara Medika: Jurnal Kedokteran dan Kesehatan INDONESIAN JOURNAL OF PHARMACY Dental Journal (Majalah Kedokteran Gigi) Indonesian Journal of Chemistry B-Dent, Jurnal Kedokteran Gigi Universitas Baiturrahmah Jurnal Material Kedokteran Gigi Journal of Material Processing and Characterization (JMPC) Odonto dental journal Indonesian Journal of Dentistry Jurnal Akuntansi Kontemporer

W. Widjijono

Departemen Biomaterial, Fakultas Kedokteran Gigi, Universitas Gadjah Mada, Yogyakarta

Author-ID : 416011

Biochemistry, Genetics & Molecular Biology Chemical Engineering, Chemistry & Bioengineering Chemistry Civil Engineering, Building, Construction & Architecture Dentistry Economics, Econometrics & Finance Engineering Health Professions Industrial & Manufacturing Engineering Materials Science & Nanotechnology Mechanical Engineering Medicine & Pharmacology Public Health

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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) Catur Septommy; Widjijono Widjijono; Rini Dharmastiti
Dental Journal (Majalah Kedokteran Gigi) Vol. 47 No. 1 (2014): March 2014
Publisher : Faculty of Dental Medicine, Universitas Airlangga https://fkg.unair.ac.id/en

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.

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 https://fkg.unair.ac.id/en

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.

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

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.

Effects of filler volume of nanosisal in compressive strength of composite resin Dwi Aji Nugroho; W. Widjijono; N. Nuryono; Widya Asmara; Wijayanti Dwi Aastuti; Dana Ardianata
Dental Journal (Majalah Kedokteran Gigi) Vol. 50 No. 4 (2017): December 2017
Publisher : Faculty of Dental Medicine, Universitas Airlangga https://fkg.unair.ac.id/en

Background: One of the composite resin composition is inorganic filler. The production of inorganic filler materials was highly dependent on non-degradable, and nonrenewable fossil fuels. Therefore, natural fibers can be used as substitute for inorganic fillers. One that can be developed is sisal. Purpose: This study aimed to determine the effects of nanosisal filler volume on compressive strength of composite resin. Methods: In this study, composite resins with nano-sized sisal as filler were manufactured and labeled as nanosisal composites. This research processed sisal fibers into nano size and mixed them with Bis-GMA, UDMA, TEGDMA, Champhorquinone (Sigma Aldrich). Nanofiller composite (Z350 XT, 3M, ESPE) was utilized as a control. The 20 samples utilized were divided into 4 groups (each group containing five samples): Group A contained nanosisal composite of 60% filler volume, group B, nanosisal composite of 65% filler volume, group C, nanosisal composite of 70% filler volume and group D, nanofiller composite (Z350 XT, 3M, ESPE). Samples were 2 mm in diameter and 6 mm in height. The sample was tested for compressive strength using a universal testing machine (UTM). Data was analyzed by means of a Kruskal Wallis procedure. Results: The mean of the compressive strength of the nanosisal composite 60% was 16.80 MPa; the nanosisal composite 65% was 10.80 MPa, the nanosisal composite 70% was 7.20 MPa and the nanofiller composite was 7.40 MPa. There was a significant difference in data analysis (p = 0.033; p < 0.05). Conclusion: In this study, the filler volume of nanosisal influenced the compressive strength of a composite resin and the nanosisal filler volume was recomended at 60%.

Effect of corncob powder concentration on properties of inlay waxes Irnawati, Dyah; Harsini; Widjijono; Siswomihardjo, Widowati; Sunarintyas, Siti; Yasnawi, Mohammad Imanuddin; Verani, Dhea Maurilla
Dental Journal (Majalah Kedokteran Gigi) Vol. 58 No. 3 (2025): September
Publisher : Faculty of Dental Medicine, Universitas Airlangga https://fkg.unair.ac.id/en

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.20473/j.djmkg.v58.i3.p242-248

Background: Corncob powder is a promising filler that needs to be assessed when it is incorporated into inlay waxes to modified its properties. Purpose: This study aims to investigate the effect of different concentrations of corncob powder filler on physical and mechanical properties of inlay waxes. Methods: Five groups of inlay waxes were prepared from paraffin, corncob powder, carnauba wax, and beeswax in varying proportions (w/w%), namely, group I (70:0:25:5), II (65:5:25:5), III (60:10:25: 5), IV (55:15:25:5), and V (50:20:25:5). The wax mixture was heated at 80°C, filtered, added with corncob powder, and stirred until homogeneous then poured into mold for melting point, residue on ignition, flow, hardness, and trimming samples. They were based on ANSI/ADA specification no.122 and ASTM D 1321. The data were analyzed through one-way ANOVA, post-hoc LSD, and Tamhane tests (p = 0.05), except trimming test data. Results: One-way ANOVA revealed that the concentration of corncob filler influenced all inlay waxes properties (p<0.05). LSD and Tamhane post-hoc test, showed significant different among mostly between groups of tests. Addition corncob powder increased the melting point, hardness, and residue of inlay waxes but decreased the flow of inlay waxes. Addition corncob did not influence the trimming property of inlay waxes. Conclusion: The concentration of corncob filler added in inlay wax compositions influenced the melting point, flow, hardness and residue properties but did not influence trimming properties. Inlay wax containing 10% corncob filler potential as a local inlay wax, but further research should be done to overcome the residue on ignition property that higher than standards.

Co-Authors Adella Syvia Maharani Agustin Wulan Agustin Wulan Akhmad Kharis Nugroho Ariyani Faizah Budiono Budiono Catur Septommy Dana Ardianata Dendy Murdiyanto Dewi Arsih Sulistiani Diatri Nari Ratih Diyah Fatmasari Dwi Aji Nugroho, Dwi Dyah Irnawati Eko Hadianto Eko Hadianto, Eko Eko Sri Kunarti Endah Ariyati Eko Ningtyas Endang Wahyuningtyas Erna Prawita Setyowati Etny Dyah Harniati Gustina, Mara Harsini Harsini, Harsini Ikmal Hafizi Iwan Dwi Prahasto Iwan Dwi Prahasto Izfan Yulviansyah Karna Wijaya Leny Yuliatun Leny Yuliatun M.K. Herliansya M.K. Herliansya, M.K. Marsetyawan HNE Soesatyo N Nuryono N. Nuryono Nisaa, Khairun Nuryono Nuryono Nuryono Nuryono Nuryono Nuryono Pramudya Aditama Prihashinta Uswatun Hasanah Purwanti, Sari Purwanto Agustiono Purwanto Agustiono Raphael Tri Endra Untara Resti Efrata Eka Rethy Den Rini Dharmastiti Rini Dharmastiti S. Sunarintyas S. Sunarintyas, S. Sari Purwanti Siti Sunarintyas Siti Sunarintyas Soesatyo, Marsetyawan Heparis Nur Ekandaru Suryono Suryono . Tri Windarti Verani, Dhea Maurilla Wehartaty, Tineke Wibowo, Diva Agrita Dentisia Widowati Siswomihardjo Widya Asmara Widya Asmara Widya Asmara Widyapramana Widyapramana Widyapramana Widyapramana, Widyapramana Wijayanti Dwi Aastuti Yasnawi, Mohammad Imanuddin Yoga Yuniadi Yosaphat Bayu Rosanto Zwista Yulia Dewi

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