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Purwanto Agustiono
Departemen Ilmu Biomaterial Kedokteran Gigi Fakultas Kedokteran Gigi, Universitas Gadjah Mada Yogyakarta.
Dentistry Materials Science & Nanotechnology

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Penambahan Sisal-mikro Terhadap Kekuatan Flexural pada Base Plate Resin Akrilik Micro Sisal Adduction toward Flexural Strength Base Plate Acrylic Resin Anastasia Anastiti Sari Dewanti; Widjiono Widjiono; Purwanto Agustiono
Jurnal Material Kedokteran Gigi Vol 5 No 1 (2016): JMKG Vol 5 No 1 Maret 2016
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

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Abstract

Composite dental resin consists of polymer with reinforcement materials, such as quartz, silica, glass, and short fibers, they generally came from natural resources that cannot be renewed. Natural fibers sisal (Agave sisalana), has an abundance of it and can be cultivated and renewed, which protects the environment’s ecosystem. Generally, natural fibers are hydrophilic, but can change to hydrophobic by alkalization. This can be used as an alternative reinfocrmrnt material to used instead in dental composite. This research used sisal fiber (Balittas-Malang), acrylic resin (QC-20). Alkalization used NaOH 6%, neutralization used acetic acid 2%. Utilities that used such were: SEM and universal testing machine. The data of 8 sample sized 60×10×4 mm were analyzed with independent t-test. The micro sisal preparation resulted in particle sized 0,075-100 µm, the mean of unfilled acrylic resin was 109,20 ± 3,12 MPa micro sisal reinforced acrylic resinwas and 94,42 ± 9,35 MPa (K) with significant difference. A decreasing flexural strength is caused by a change of characteristic from hydrophilic (beginning) to hydrophobic (scouring) and changed to hydrophilic again in the neutralization process using acetate acid. Conclusion of this research was the adduction of microsisal without coupling agent reduced the flexural strength of acrylic resin.
Pengaruh pH Saliva terhadap Kelarutan Ion Aluminium Pada Resin Komposit Nanohybrid Aufia Espressivo; Dyah Irnawati; Purwanto Agustiono
Jurnal Material Kedokteran Gigi Vol 6 No 2 (2017): JMKG Vol 6 No 2 September 2017
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (529.533 KB) | DOI: 10.32793/jmkg.v6i2.268

Abstract

Nanohybrid composite resin is a type of composite resin restorative material containing micro-sized filler particles incorporated with nanoparticles. Composite resin restoration in the oral cavity can release its filler particles, one of them is aluminum ion. The pH of saliva is varied. This research aimed to determine the influence of salivary pH on aluminum ion solubility of nanohybrid composite resin. The materials used were nanohybrid composite resin Tetric Evoceram (Ivoclar Vivadent, Austria) and artificial saliva with pH of 5.6, 6.7, and 8.0. Twelve disc-shaped composite resin samples sized 5 mm in diameter and 2 mm thick were made. Samples were polymerized using light curing unit for 20 seconds. Composite resin samples were divided into three pH groups (n=4) and then each sample was soaked in 10 mL artificial saliva inside of polyethylene bottle. The immersion was done in the incubator for 14 days at 37ºC. The concentration of aluminum ion in artificial saliva solutions subsequently was calculated using AAS. Data were analyzed using One-way ANOVA (a=0,05). The mean concentration of aluminum ion released into saliva with pH 5.6, 6.7, and 8.0 were 0.538 ± 0.996 ppm, 0.431 ± 0.981 ppm, and 0.350 ± 0.071 ppm respectively. The result of One-way ANOVA showed a significant influence of salivary pH variation to the solubility of aluminum ion on nanohybrid composite resin (p<0,05). LSD test showed a significant difference only between saliva pH 5,6 and 8,0. The conclusion of this research was that low salivary pH increased the solubility of aluminum ion on nanohybrid resin composite in saliva.
Perbandingan Kekuatan Fleksural Antara Orientasi Unidirectional dan Bidirectional Fiber Agave Sisalana pada Fiber Reinforced Composite Erfandi Ahmad; Purwanto Agustiono; Dyah Irnawati
Jurnal Material Kedokteran Gigi Vol 3 No 2 (2014): JMKG Vol 3 No 2 September 2014
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

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Abstract

Fiber reinforced composite (FRC) contains a polimer matrix and fibers. The FRC application as a dental splinting material requires a considerable fleksural strength to withstand the mastication forces. The fiber orientation is one factor influences the mechanical strength of FRC. The aim of study was to compare the fleksural strength between unidirectional and bidirectional orientations of sisal fiber (Agave sisalana) on FRC. The FRC with a flowable composite matrix (Master Flow, Brazil) and sisal fiber (Agave sisalana) (Balittas, Indonesia) were used. The FRC samples (25x2x2mm) were made with unidirectional and bidirectional fibers orientation (n=4). The fleksural strengths were measured using the universal testing machine and the data were analyzed statistically using an independent t-test (a=0,05). The results showed that the average fleksural strength of FRC unidirectional group was 36.56 ± 2.91 MPa and bidirectional group was 24.09 ± 2.08 MPa. The independent t-test showed a significant difference in fleksural strength between unidirectional orientation and bidirectional orientation fiber (p <0.05). This study reveals that the fleksural strength of FRC with unidirectional orientation was greater than the bidirectional orientation of sisal fiber (Agave sisalana).
Pengaruh Konsentrasi Suspensi Cu-zeolit Alam Aktif dalam Akuades terhadap Daya Antimikroba pada Candida albicans Nabilah Aulia Putri; Dyah Irnawati; Purwanto Agustiono
Jurnal Material Kedokteran Gigi Vol 6 No 2 (2017): JMKG Vol 6 No 2 September 2017
Publisher : Ikatan Peminat Ilmu Material dan Alat Kedokteran Gigi (IPAMAGI)

Show Abstract | Download Original | Original Source | Check in Google Scholar | Full PDF (509.042 KB) | DOI: 10.32793/jmkg.v6i2.271

Abstract

Activated Cu-natural zeolite is an antimicrobial agent (fungicide) combination of copper and carrier agent activated natural zeolite. The aim of this study was to determine the effect of concentration of activated Cunatural zeolitesuspension in aquadest on antimicrobial activity in C albicans. Materials used were natural zeolite (Wonosari), 2 M HCl solution, CuCl2.2H O powder (Merck, Germany), cultured C. albicans, and Sabouraud agar (Merck, Germany). Natural zeolite (50 g) was activated with500 mL 2 M HCl (1 hour/100o C). Activated natural zeolite was reacted with 250 mL 0.2 M CuCl2 (1 hour/100 C). Cu-natural zeolite suspension in aquadest were divided to 3 groups (9 mg/mL, 18 mg/mL, and 36 mg/mL) (n=4). The suspensionwas contacted with C. albicans(120 minutes), diluted, grown on Sabouraud agar, then incubated (48 hours/37oC). The colonies was countedin CFU/mL. Data were analyzed with one way ANOVA test (a = 0,05) and LSD The mean and standard deviation were 36.800 6.453 (9 mg/mL), 31.675 6.445 (18 mg/mL), and 22.375 3.025 (36 mg/mL) (CFU/mL). The result of one way ANOVA test showed that there is influence of the concentration of the suspension to antimicrobial activity in C. albicans (p<0,05). The result of LSD0,05 test showed significant differences between the concentration 36 mg/mL with 9 mg/mL and 18 mg/mL (p<0,05). High concentration of activated Cu-natural zeolite could increase its antimicrobial activity against C. albicans.
Co-Authors Anastasia Anastiti Sari Dewanti Aufia Espressivo Dyah Irnawati Erfandi Ahmad Nabilah Aulia Putri Widjiono Widjiono