Kholidina Harahap - Academia.edu (original) (raw)

Papers by Kholidina Harahap

Corrosion of copper nickel titanium archwire in chlorhexidine, sodium fluoride, and chitosan mouthwashes

F1000Research, Feb 10, 2023

The objective of this study was to evaluate the effect of titanium oxide (TiO2) nanoparticles add... more The objective of this study was to evaluate the effect of titanium oxide (TiO2) nanoparticles addition on the impact strength, tensile strength, and hardness of polymethyl methacrylate denture base material. Polymethyl methacrylate bar, sized 60x6x4 mm3 (n=27) for impact strength, 60x12x4 mm3 (n=27) for tensile strength, and 25x10x3 mm3(n=27) for hardness were evaluated. The samples were divided into three concentration groups: the control group, 0.5% of titanium oxide nanoparticles, and 1% of titanium oxide nanoparticles. The impact strength was tested using izod impact tester, the tensile strength was tested using universal testing machine, and the hardness was tested using Vickers micro hardness tester. Data were analysed using one-way ANOVA and continued with Least Significant Difference (LSD) test (α=0.05). The results showed that there were significant differences on impact strength, tensile strength, and hardness of PMMA among the tested concentration (P<0.05). The additio...

Padjadjaran Journal of Dentistry, 2021

Introduction: Orthodontic elastomeric chain is polyurethane elastomer that is widely used among o... more Introduction: Orthodontic elastomeric chain is polyurethane elastomer that is widely used among orthodontists due to its functions. Chlorhexidine (CHX) and sodium fluoride (NaF) are listed in mouthwash composition which could affect the mechanical properties of the elastomeric chain. This study was aimed to analyze the effect of sodium fluoride in chlorhexidine mouthwashes on force decay and permanent deformation of orthodontic elastomeric chains. Methods: This research is an experimental analytic laboratory with pretest-posttest control group design. 150 samples of orthodontic chains were divided into three groups. Group 1: artificial saliva (control group); Group 2: 0,1% chlorhexidine gluconate solution (CHX); Group 3: 0,1% chlorhexidine digluconate with sodium fluoride solution (CHX-NaF). The orthodontic elastomeric chain was stretched and maintained at a standardized distance equivalent to a force of 300 g. The measurement of force decay and permanent deformation were performed ...

Identifikasi Elemen Resin Komposit Mikrohibrid dan Nanohibrid dengan Energy Dispersive X-ray dan Gambaran Mikrostruktur dengan Scanning Electrone Microscopy

Jurnal Material Kedokteran Gigi, Sep 1, 2012

Perubahan elemen resin komposit mikrohibrid setelah direndam di dalam saliva buatan

Makassar Dental Journal, 2013

Dentika: Dental Journal, 2013

Resin komposit sebagai bahan restorasi di dalam mulut akan selalu berkontak dengan saliva sehingg... more Resin komposit sebagai bahan restorasi di dalam mulut akan selalu berkontak dengan saliva sehingga terjadi penyerapan air ke dalam resin komposit. Penyerapan air pada resin komposit dapat menurunkan sifat fisis dan mekanis serta menimbulkan kelarutan elemen resin komposit sehingga akan memperpendek masa pakai dan menimbulkan toksis. Penelitian ini bertujuan untuk membandingkan besaran serapan air, kedalaman dan kecepatan penyerapan air antara resin komposit mikrohibrid dengan nanohibrid setelah direndam di dalam saliva buatan. Sampel yang digunakan pada penelitian ini dibuat dari resin komposit mikrohibrid dan nanohibrid berbentuk tablet berdiameter 15 mm dan tebal 1 mm dengan pengerasan sinar tampak biru. Penelitian dilakukan dengan merendam sampel di dalam saliva buatan selama 2, 4, 6, dan 8 jam. Besaran serapan air dihitung dari perubahan berat yang terjadi dan kedalaman penyerapan air diukur dengan menggunakan mikrograf mikroskop. Kecepatan penyerapan dihitung dengan membandingk...

Effect of Hydroxyapatite Synthesized from Tilapia Fish Scale Waste on the Shear Bond Strength of GIC and RMGIC to Enamel Layer (<i>In Vitro</i> Study)

Materials Science Forum, Aug 31, 2022

Pelayanan Kesehatan Gigi Dan Mulut Pada Murid SDN 060847 Dan 060848 Medan Petisah

Prosiding Seminar Nasional Program Pengabdian Masyarakat, 2018

Composite resin as a restorative material will contact with saliva continuously and will absorb w... more Composite resin as a restorative material will contact with saliva continuously and will absorb water in the mouth. Water absorption will decrease physical and mechanical properties and leach the elements of composite resin causes shortening shelf life and toxicity will occur. The aim of this study was to compare the amount, depth and rate of water absorption between microhybrid and nanohybrid composite resin and identifying the elements after immersed in artificial saliva. Microhybrid and nanohybrid composite resins were used in this study. Samples were made in tablet shape with 15 mm in diameter and 1 mm in thickness and cured with visible blue light. This study was performed by immersing the samples in artificial saliva for 2, 4, 6, and 8 hours. Amount of water absorption was calculated by using the changes on weight of samples and depth of water absorption were measured by using micrograph microscope. The rate of water absorption was calculated by comparing depth of water absorp...

Differences in Radiopacity Value of Rmgic, Gic and Composite Resin Materials with Secondary Caries using Conventional and Digital Radiography

Perubahan Warna Resin Komposit Mikrohibrid Setelah Pemutihan Dengan Hidrogen Peroksida 15

Sekarang ini dental estetik berkembang dengan maju dan salah satunya adalah berkaitan dengan warn... more Sekarang ini dental estetik berkembang dengan maju dan salah satunya adalah berkaitan dengan warna gigi. Pasien lebih memilih restorasi yang memiliki warna seperti warna gigi aslinya ataupun menjalani pemutihan gigi untuk mendapatkan warna yang lebih terang sehingga mungkin saja pasien yang memiliki tambalan resin komposit akan melakukan pemutihan gigi juga. Oleh karena itu, tujuan penelitian ini adalah untuk mengevaluasi efek bahan pemutih gigi hidrogen peroksida 15% terhadap perubahan warna resin komposit mikrohibrid. Penelitian ini menggunakan 25 sampel resin komposit mikrohibrid warna A3 dengan diameter 7 mm dan tebal 2 mm. Pengamatan warna dilakukan pada seluruh sampel sebelum dan setelah perlakuan dengan menggunakan shade guide dan diberikan skor untuk setiap hasil pengamatan. Aplikasi bahan pemutih hidrogen peroksida 15% dilakukan selama 20 menit dan perlakuan diulang untuk 10 hari. Hasil analisis statistik uji t-dependent menunjukkan perbedaan signifikan antar kelompok (p&lt...

Effect of Hydroxyapatite From Nile Tilapia (Oreochromisniloticus) Scale on Surface Hardness of Conventional and Resin Modified Glass Ionomer Cement (In Vitro Study)

Serapan Cairan dan Kelarutan Elemen-elemen Bahan Restorasi Resin Komposit Mikrohibrid dan Nanohibrid Setelah Direndam di Dalam Saliva Buatan (In Vitro)

Effect of bench time polymerization on depth of cure of dental composite resin

IOP Conference Series: Materials Science and Engineering

The aim of this research was to investigate the effect of bench time before light cured polymeriz... more The aim of this research was to investigate the effect of bench time before light cured polymerization on the depth of cure of dental composite resin. Nanofiller composite resin (Filtek Z350 XT,3M, ESPE,China) was used in this study. Sixty samples of nanofiller composite resin were made and divided into control and test groups with bench time for 0, 15, 30, 45, and 60 min. For the test group, composite resins were stored in refrigerator with 4°C temperatures. Meanwhile, for the control groups, the composite resin was stored at room temperature. The samples were prepared using metal mould with size diameter of 6 mm and 4 mm in thickness. Samples were cured for 20 s by using visible blue light curing unit. Part of samples that unpolymerized were removed by using a plastic spatula. The remaining parts of samples were measured by digital caliper and noted as depth of cure (mm). Data were analyzed to one-way ANOVA and LSD tests (p≤0.05). Results showed there was no significance differences between test groups (p=0.5). A 60 minutes bench time group showed the highest depth of cure value among test group, and it was almost similar with control group value. It can be concluded that longer bench time can increase the depth of cure of composite resin.

Proceedings of the International Dental Conference of Sumatera Utara 2017 (IDCSU 2017), 2018

Heat cured acrylic resin has been used as dental prosthetic devices because of its excellent appe... more Heat cured acrylic resin has been used as dental prosthetic devices because of its excellent appearance, simple processing technique and easy repair. The absence of filler on acrylic resin causes limitation of flexural strength at the time of use. Fish scales can be used as filler to reinforce the acrylic resin because they contain collagen and hydroxyapatite minerals. This study was designed to evaluate the flexural strength of acrylic resin reinforced with fish scale powder. Thirty samples was made from heat cured acrylic resin sized 65x10x2 mm. Samples were divided into control group and treatment group which is added by fish scale powder in 5% and 10% by weight. Flexural strength of heat cured acrylic resin was tested by using three point bending method. The result shows that the addition of 5% and 10% fish scale powder decreased flexural strength of heat cured acrylic resin. There is significant differences on flexural strength among all groups (p=0.00).The conclusion is fish scale powder in 5% and 10% did not improved the flexural strength of heat cured acrylic resin.

Majalah Kedokteran Gigi Indonesia

Nickel-titanium (NiTi) arch wire has properties that favor its use during the leveling and aligni... more Nickel-titanium (NiTi) arch wire has properties that favor its use during the leveling and aligning phase of orthodontic treatment. This NiTi orthodontic arch wire has the potential to experience nickel ion release. One factor that can cause the release of nickel ions is toothpaste. Nickel ions released can enter the body and cause carcinogenic, mutagenic, cytotoxic, and allergic effects. The purpose of this study was to see the differences of nickel ions released from NiTi orthodontic arch wire after immersion in detergent and non-detergent toothpaste. This was a laboratory experimental research to draft a comparative design. The sample size was 40 pieces of NiTi orthodontic arch wire which were divided into 2 groups, immersion in detergent toothpaste and immersion in non-detergent toothpaste. The sample used was NiTi arch wire solution immersed in toothpaste and distilled water for 24 hours in an incubator at 37 °C then measured using inductively coupled plasma (ICP) mass spectrom...

Dentika Dental Journal

Immersion and spraying with disinfectant solution are the effective disinfection methods for algi... more Immersion and spraying with disinfectant solution are the effective disinfection methods for alginate impression. However these methods causes dimensional changes on impression. Therefore mouthwash, which also has disinfectant function on microorganism can be used as mixing solution for alginate impression material. The aim of this study is to analyze antibacterial capacity of mouthwashes that used as admix solution for alginate impression. Samples was made from alginate impression material in tablet form with 15 mm diameter and 1 mm thickness. Total samples are 35 , 5 for admix with aquadest as control, chlorhexidine 0.1%, povidon iodine, sodium fluoride 0.1% wv, respectively. Samples were put on incubated Staphylococcus aureus in petri dish and kept in incubator for 24 hours at 37°C. Immersion was performed by dipping 15 samples of hygedent admix with aquadest into mouthwash liquids for 15 minutes. Inhibition zone was measured by using digital calliper. Statistic analysis was perf...

Dental Journal (Majalah Kedokteran Gigi)

Background: Stainless steel is a material that can be used in orthodontics for components of dent... more Background: Stainless steel is a material that can be used in orthodontics for components of dental braces, such as brackets, archwires and molar bands. Orthodontic archwires exposed to toothpaste can release nickel ions that cause hypersensitivity. The excessive use of sodium lauryl sulphate in detergent toothpaste can cause mouth irritation, severe ulceration, decreased salivary solubility and taste sensitivity changes. Purpose: The aim of this study is to compare the nickel ion released by stainless steel archwires after immersion in detergent and non-detergent toothpaste. Methods: Forty stainless steel archwires from Ortho Organizer (0.016 x 0.022in) were divided into two groups (n=20). Group 1 comprised stainless steel archwires immersed in detergent toothpaste. Group 2 consisted of stainless steel archwires immersed in non-detergent toothpaste. These archwires were immersed in 1.5g toothpaste then kept in an incubator at 37°C for around 24 hours. After that, the archwires were...

Intisari Sains Medis, Sep 14, 2018

Introduction: Temperature plays a role in polymerization process of composite resin. Depth of cur... more Introduction: Temperature plays a role in polymerization process of composite resin. Depth of cure is often used as a marker of polymerization adequacy in composite resins. Adequate polymerization will increase the mechanical properties of composite resin. The aim of this study was to evaluate the effect of storage temperature on depth of cure and compressive strength of composite resin. Method: Samples were made from nanofiller composite resin (Filtek Z350 XT,3M,ESPE,USA) after the materials were stored at 4°C and 24°C for two weeks. Twenty samples of nanofiller composite resins for each test group were prepared using metal mould with 6 mm in diameter and 4 mm thick. Samples were cured under visible blue light for 20 second. The polymerized composite resin was measured for determining the depth of cure. Compressive strength of samples was tested by using Universal Testing Machine. Result: The results showed that depth of cure value of 24°C (3.90 ± 0.07 mm) was higher than 4°C (3.83 ± 0.17 mm) and compressive strength of 24°C (35.20 ± 4.63 MPa) was higher than 4°C (26.47 ± 3.13 MPa). Statistical analysis showed that depth of cure were no siginificant differences (p > 0.05) but in compressive strength were significant differences between test groups (p < 0.05). Conclusion: Storage temperature can affect the depth of cure and compressive strength of composite resin, although no significant difference on the depth of cure.

Talenta Conference Series: Tropical Medicine (TM), Oct 2, 2018

To mantain digestive health, people usually consume yogurt that has acidity 4-5. Acidic solutions... more To mantain digestive health, people usually consume yogurt that has acidity 4-5. Acidic solutions can cause the surface roughness of acrylic resin heat cured is used as denture base material. Denture with rough surfaces facilitate the attachment of plaque and bacteria that can degrade the cleanliness and health of the patient. The purpose of this study was to analyze the surface roughness of acrylic resin heat cured after being immersed in yogurt with different immersion time. Thirty acrylic resin heat cured specimens (12 mm in length, 12 mm in wide and 2 mm height) were prepared and divided into three experimental groups (n=10): I (specimens immersed in yogurt for 60 minutes), II (specimens immersed in yogurt for 120 minutes) and III (specimens immersed in yogurt for 180 minutes). Surface roughness before and after immersion was measured using Profilometer. Data will be analyzed using T test (p<0,05). After immersion, the specimens showed significantly different on surface roughness (p=0,04). Among the experimental groups, immersion for 180 minutes showed the highest surface roughness value than 60 and 120 minutes. It can be concluded that yogurt can make surface roughness of acrylic resin heat cured. Increasing surface roughness depends on exposure time of yogurt on acrylic resin heat cured.