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All Journal Jurnal Kedokteran Gigi Universitas Padjadjaran Padjadjaran Journal of Dentistry Jurnal Material Kedokteran Gigi

Zulia Hasratiningsih, Zulia

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Author-ID : 614403

Biochemistry, Genetics & Molecular Biology Dentistry Health Professions Immunology & microbiology Materials Science & Nanotechnology Medicine & Pharmacology Public Health

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Composition, tensile strength, and elastic modulus of Orden as cast post alloy Anggraini, Novi; Hasratiningsih, Zulia; Subrata, Gantini
Padjadjaran Journal of Dentistry Vol 22, No 1 (2010): March 2010
Publisher : Universitas Padjadjaran

Post is one element of the fixed restorations that is generally used to restore endodontically treated teeth at Prosthodontic Installation of Oral and Dental Hospital (RSGM) Faculty of Dentistry Universitas Padjadjaran, whereas Orden alloy is still used as cast post material. The faculty supplies Orden without packaging or manuals, so the information about its composition and mechanical properties are not available. This study was conducted to search the composition, tensile strength, and elastic modulus of Orden. For the composition test, a specimen with size 20x20x2 mm3 was tested with Optical Emission Spectroscopy (OES). For tensile test, 6 specimens were made according to ASTM Standard E8. While for bending test, 6 specimens were made according to ASTM Standard E855. The Universal Testing Machine Instron 1195 was used to test the tensile strength and elastic modulus. The value of tensile strength of Orden was compared to gold alloy type III and the value of elastic modulus of Orden was compared to dentin. Composition test found that Orden was a brass with the largest ingredient of copper 53.76 wt%, followed by zinc 44.94 wt%, and aluminum 1.17 wt%. The statistic calculation showed that tensile strength of Orden was lower than gold alloy type III and the elastic modulus of Orden was higher than dentin.

The effect of disinfection of alginate impressions with 35% beetle juice spray on stone model linear dimensional changes Ramadianto, Anggra Yudha; Hasratiningsih, Zulia; Manurung, Rosida
Padjadjaran Journal of Dentistry Vol 19, No 2 (2007): July 2007
Publisher : Universitas Padjadjaran

Dimensional stability of alginate impression is very important for treatment in dentistry. This study was to find the effect of the beetle juice spray procedure on alginate impression on gypsum model linear dimensional changes. This experimental study used 25 samples, divided into 5 groups. The first group, as control, were the alginate impressions filled with dental stone immediately after forming. The other four groups were the alginate impressions gel spray each 1,2,3, and 4 times with 35% beetle juice and then filled with dental stone. Dimensional changes were measured in the lower part of the plaster model from buccal-lingual and mesial-distal direction and also measured in the outer distance between the upper part of the stone model by using Mitutoyo digital micrometre and profile projector scaled 0,001 mm. The results of mesial-distal diameter average of the control group and group 2,3,4, and 5 were 9.909 mm, 9.852 mm, 9.845 mm, 9.824 mm, and 9.754 mm. Meanwhile, the results of buccal-lingual diameter average were 9.847 mm, 9.841 mm, 9.826 mm, 9.776 mm, and 9.729 mm. The results of the outer distance between the upper part of the stone model were 31.739 mm, 31.689 mm, 31.682 mm, 31.670 mm, and 31.670 mm. The data of this study was evaluated statistically based on the variant analysis. The conclusion of this study was statistically, there was no significant effect on gypsum model linear dimensional changes obtained from alginate impressions sprayed with 35% beetle juice.

Differentiation of physical and mechanical properties analysis of self made gypsum product with raw material from Tasikmalaya with standar ISO and factory made AP, Wahyuning; Hasratiningsih, Zulia; Manurung, Rosida
Padjadjaran Journal of Dentistry Vol 20, No 3 (2008): November 2008
Publisher : Universitas Padjadjaran

In early research, gypsum’s product from Padalarang and Tasikmalaya had been compared and it is found that Tasikmalaya gypsum was better. In these research, it’s used gypsum product from Tasikmalaya with wet calcination method using autoclave. This research consisted of four samples divided into three control groups and one treatment group. Research’s sample consisted of 45 units and 15 units data from the last research. To compared physical and mechanical properties, every samples was tested in three treatments. Research results showed that the average setting time, setting expansion and compressive strength of wet calcination gypsum product are respectively 487.6 seconds, 0.492%, and 12.708 Mpa. The results were statistically analyzed with MANOVA and Tukey test. The analysis showed differences in physical and mechanical properties between self made gypsum product from Tasikmalaya with Padalarang’s and two marketed gypsum products. Setting time self made gypsum product meets the ISO for type III, while compressive strength and setting expansion were not. But gypsum’s production from Tasikmalaya done by wet calcinations had better physical and mechanical properties, so it can be used in dentistry.

Stress distribution analysis of seat and non-seat preparation design for orden cast post using 2D finite element method Miranda, Aldilla; Subrata, Gantini; Hasratiningsih, Zulia; Dirgantara, Tatacipta
Padjadjaran Journal of Dentistry Vol 23, No 3 (2011): November 2011
Publisher : Universitas Padjadjaran

The post is used to retain a core that supports the definitive restoration. One of the important factors in the prognosis of post-endodontic restoration system is the post space preparation design which effects to the distribution of stresses. The purpose of this study was to analyze the effect of post space preparation design at the cervical area of the root to the stress distribution on static loading using (two dimensions) finite element method. This was a numeric simulation study using two 2D digital models: seat and non-seat design of maxillary central incisors using commercial software of finite element. The procedures of pre-processing, solution, and post-processing were used to evaluate the distribution of internal stress caused by static loading 110 N which was applied at 135° angle with tooth longitudinal axis on the palatal surface of the core. Both models of restoration with cast post-core of Orden alloy were divided into 15,400 triangular elements. This study showed that the stress distribution from the loading location to the location of stress concentration and the value of maximum stress at cervical part of the root at non-seat design was lower than the seat design (seat design 3.69 times greater than non-seat). This study proved that non-seat design distributes stress better than seat design.

Co-Authors agustina dewi Aldilla Miranda Anggra Yudha Ramadianto, Anggra Yudha Bambang Sunendar Bambang Sunendar Purwasasmita, Bambang Sunendar DIYAN HERDIYANTORO Elin Karlina Erna Kurnikasari Frahdian, Tommy Frahdian, Tommy Gantini Subrata, Gantini Gema Gempita, Gema Gunawan, Joseph Gunawan, Joseph Hakim, Muhammad Lukman Nur Hakim, Muhammad Lukman Nur Hasna Dziab, Hasna Nadia Greviana, Nadia Nina Djustiana Novi Anggraini, Novi Prameshwari, Fadilla Rizky Rosida Manurung, Rosida Susi, Bernadeta Tatacipta Dirgantara, Tatacipta Taufik, Dede Veni Takarini Wahyuning AP, Wahyuning Yanwar Faza Yusuf, Muhammad Erlangga Maulana

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