scholarly journals UJI KEKERASAN RESIN KOMPOSIT AKTIVASI SINAR DENGAN BERBAGAI JARAK PENYINARAN

e-GIGI ◽  
2015 ◽  
Vol 3 (2) ◽  
Author(s):  
Jimmy Allorerung ◽  
P. S. Anindita ◽  
Paulina N. Gunawan
Keyword(s):  
Visible Light ◽  
Light Source ◽  
Vickers Hardness ◽  
Sampling Method ◽  
Composite Resin ◽  
Composite Surface ◽  
Purposive Sampling ◽  
Hardness Tester ◽  
Post Test ◽  
Nanohybrid Composite

Abstract: Composite resin is a dental material which is used to fix the caries teeth because it have good esthetic and hardness. Visible light cured (VLC) composite resin hac better polymerization than chemical reaction composite resin. However, it does not have any abutment, therefore, the distance between light source and the composite surface is mostly ignored by the operator. Lightning process is very important to obtained good polymerization, so that the composite has enough hardness to hold back human masticate pressure. Composite which does not have enough hardness will be easily cracked. This study aimed to find out the correct distance of polymerization so that the composite resin has enough hardness to hold back human masticate pressure. This study used a post-test only design group and was conducted at the Laboratory of Metalurgy University of Sam Ratulangi. There were 27 samples of nanohybrid composite resin obtained by using a purposive sampling method. The measurement used was the Vickers method and micro Vickers hardness tester. The results showed that the group that had the highest hardness value was the first group with a lightning distance of 0 mm or light source touching composite resin surface, the value of hardness was 841.49 N/mm2. This value step by step decreased because the lightning distance increased, so that the lowest hardness value is 290,95 N/mm2 which on ninth group. Conclusion: The lightning distance of nanohybrid composite resin which could hold back the maximum human masticate pressure was on distance 0-6 mm.Keyword : distance of lightning, nanohybrid composite resin, hardness value.Abstrak: Resin komposit merupakan bahan tumpatan yang sering digunakan dalam kedokteran gigi karena memiliki nilai estetis serta kekerasan yang baik. Resin komposit aktivasi sinar berpolimerisasi lebih baik daripada resin komposit aktivasi kimia, tetapi alat visible light cured (VLC) yang digunakan tidak memiliki dudukan sehingga jarak antara sumber sinar dengan permukaan komposit saat penyinaran sering diabaikan. Proses penyinaran sangat penting agar terjadi polimerisasi yang baik sehingga komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah manusia. Kekerasan yang tidak cukup dapat menyebabkan komposit mengalami cracking atau pecahnya tumpatan didalam mulut. Tujuan penelitian ini untuk mengetahui jarak penyinaran yang tepat agar resin komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah manusia. Metode penelitian yang digunakan adalah metode post-test only design group yang diukur pada resin komposit jenis nanohibrid dan dilakukan di Laboratorium Metalurgi Jurusan Teknik Mesin Universitas Sam Ratulangi, dengan sampel sebanyak 27 sampel. Pengambilan sampel dilakukan dengan metode purposive sampling dan pengukuran kekerasan komposit menggunakan metode Vickers dan alat micro vickers hardness tester. Hasil penelitian menunjukan bahwa kelompok yang memiliki nilai kekerasan tertinggi terdapat pada kelompok pertama dengan jarak penyinaran 0 mm atau sumber sinar menyentuh permukaan komposit dengan nilai kekerasan 841,49 N/mm2. Nilai kekerasan ini secara bertahap menurun seiring dengan bertambah jauh jarak penyinaran, sehingga nilai kekerasan paling rendah terdapat pada kelompok penyinaran 8 mm yaitu 230,95 N/mm2. Kesimpulan dari penelitian ini yaitu jarak penyinaran terhadap resin komposit jenis nanohibrid sehingga resin komposit memiliki kekerasan yang cukup untuk menahan tekanan kunyah maksimal manusia berkisar pada jarak 0-6 mm.Kata kunci : jarak penyinaran, resin komposit nanohibrid, nilai kekerasan

scholarly journals KONTRIBUSI LATIHAN PNF DAN LATIHAN SHUTTLE RUN TERHADAP KEMAMPUAN TENDANGAN DOLLYO CHAGI PADA ATLET PRA-JUNIOR PUTRA USIA 10-13 TAHUN TIGER TAEKWONDO CLUB BINJAI TAHUN 2021

2021 ◽  
Vol 2 (1) ◽  
pp. 74-84
Author(s):  
Nisrina Naila ◽  
Imran Akhmad
Keyword(s):  
Data Collection ◽  
Experimental Method ◽  
Sampling Method ◽  
Purposive Sampling ◽  
Group Design ◽  
Independent Variables ◽  
Junior Athletes ◽  
Post Test ◽  
Shuttle Run ◽  
Two Independent Variables

This study aims to determine the contribution of PNF training and Shuttle Run training to Dollyo Chagi's kicking ability in male Pre-Junior athletes aged 10-13 years Tiger Sumatra Taekwondo Club Binjai 2021. The method used in this study is an experimental method with data collection techniques involving two independent variables, namely PNF and Shuttle Run on the dependent variable dollyo chagi kick ability. The population in this study amounted to 30 athletes, and the sample in this study amounted to 10 athletes who were selected by purposive sampling method. The design of this study used a post-test one group design. The results of this study indicate that (1) There is There is a contribution of PNF training to the dollyo chagi kick ability of 79% (2) There is a contribution of Shuttle Run training to the dollyo chagi kick ability 19.2%, (3) There is a contribution of PNF and Shuttle Run training to the dollyo chagi kicking ability known by looking at the value of R (r2 x 100%). The value of r2 is 0.911, so it is known that the amount of contribution is 91.1%.

scholarly journals Influence of increment thickness on microhardness and bond strength in composite resins

2021 ◽  
Vol 10 (9) ◽  
pp. e32810917974
Author(s):  
Isis Almela Endo Hoshino ◽  
Mariana de Oliveira Bachega ◽  
Paulo Henrique dos Santos ◽  
André Luiz Briso ◽  
Rodolfo Bruniera Anchieta
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Composite Resins ◽  
Third Molars ◽  
Microtensile Bond Strength ◽  
Significant Difference ◽  
Post Test ◽  
Knoop Microhardness ◽  
Nanohybrid Composite ◽  
New Generation

The aim of this study was to evaluate the Knoop microhardness and the microtensile bond strength of a second-generation of bulk-fill (BF) and a nanohybrid composite resins (NH) in different thicknesses of increments. For this, ninety disks of composite resin were made for Knoop microhardness, being divided into six groups (n = 15). The Knoop microhardness obtained in each millimeter of the internal face. For microtensile bond strength, ninety restored in third molars were used, divided into six groups (n = 15). For Knoop microhardness, the Wilcoxon and Friedman test was used. For the microtensile bond strength were used the Two-way Anova test and Tukey's post-test (p <0.05). The NH resin showed higher Knoop micro hardness than BF and it was observed that hardness value decreases as increases the thickness of the resin. There was no significant difference in microtensile bond strength comparing NH and BF. However, there was a significant difference between G2 and G4 for the NH groups, with the highest and lowest bond strength values, respectively. Thus, the new generation of the bulk-fill composite resin provided lower microhardness values as the thickness of the increments increases in comparison with the nanohybrid composite resin. The microtensile bond strength does not appear to have been influenced by the type of resin, or the thickness of the increment.

scholarly journals Polymerization shrinkage evaluation of three packable composite resins using a gas pycnometer

2003 ◽  
Vol 17 (3) ◽  
pp. 273-277 ◽  
Author(s):  
Ricardo Amore ◽  
Clóvis Pagani ◽  
Michel Nicolau Youssef ◽  
Camillo Anauate Netto ◽  
Hugo Roberto Lewgoy
Keyword(s):  
Light Source ◽  
Composite Resin ◽  
Composite Resins ◽  
Restorative Dentistry ◽  
Adhesive Systems ◽  
Posterior Teeth ◽  
Composite Surface ◽  
Polymerization Shrinkage ◽  
Before And After

Modern restorative dentistry has been playing an outstanding role lately since composite resins, allied to adhesive systems, have been widely applied on anterior and posterior teeth restorations. The evolution of composite resins has mostly been verified due to the improvement of their aesthetic behavior and the increase in their compressive and abrasive strengths. In spite of these developments, the polymerization shrinkage inherent to the material has been a major deficiency that, so far, has been impossible to avoid. Using a gas pycnometry, this research investigated the polymerization shrinkage of three packable composite resins: Filtek P60 (3M), Prodigy Condensable (Kerr), and SureFil (Dentsply/Caulk), varying the distance from the light source to the surface of the resins (2 mm or 10 mm). The pycnometer Accupyc 1330 (Micromeritics, USA) precisely records helium displacement, allowing fast and reliable measurements of the volume of composite resin immediately before and after polymerization, without interference of temperature or humidity. Results were not found to be statistically different for the three tested resins, either for 2 mm or 10 mm-distance from the light source to the composite surface.

scholarly journals Influence of light source and immersion media in surface roughness and hardness of a nanofilled composite resin

2013 ◽  
Vol 1 (2) ◽  
pp. 165
Author(s):  
Patrícia Aleixo dos Santos Domingos ◽  
Patrícia Petromilli Nordi Sasso Garcia ◽  
Ana Luisa Botta Martins Oliveira ◽  
Juliana Álvares Duarte Bonini Campos ◽  
Regina Guenka Palma Dibb
Keyword(s):  
Surface Roughness ◽  
Light Source ◽  
Vickers Hardness ◽  
Statistical Difference ◽  
Composite Resin ◽  
Artificial Saliva ◽  
Anova Test ◽  
Significant Statistical Difference ◽  
Light Curing ◽  
Respective Solution

The study evaluated the influence of light curing units and immersion media on superficial roughness and microhardness of the nanofilled composite resin Supreme XT (3M/ESPE). Light curing units used were: XL 3000 (3M/ESPE), Jet Lite 4000 Plus (JMorita) and Ultralume Led 5 (Ultradent) and immersion media were artificial saliva, Coke®, tea and coffee, totaling 12 experimental groups. Specimens (10mm x 2mm) were immersed in each respective solution for 5 seconds, three times a day, during 60 days and so, were submitted to measure of superficial roughness (Ra) and Vickers hardness. Data were subjected to two-way ANOVA test (p<0.05). Results showed that only the light source factor showed statistically difference for hardness. It was observed that the hardness of the composite resin Filtek Supreme XT (3M/ESPE) was influenced by the light source (p<0.01) independently of the immersion media (p= 0.35) and the Jet Lite 4000 Plus (JMorita) was the light curing unit that presented lower values. In relation to surface roughness, it was noted no-significant statistical difference for light source (p=0.84), when specimens were immersed in different beverages (p=0.35).

scholarly journals PENGGUNAAN ANTISEPTIK ALKOHOL 70% DAN OCTENIDINE DIHYDROCHLORIDE 0,1% PADA PROSEDUR PEMASANGAN INFUS UNTUK MENCEGAH PHLEBITIS

2017 ◽  
Vol 3 (1) ◽  
pp. 25
Author(s):  
Shella Beatrix ◽  
Gilny Aileen Joan ◽  
Denny Ricky
Keyword(s):  
Data Acquisition ◽  
Experimental Method ◽  
Sampling Method ◽  
Wound Closure ◽  
Test Statistics ◽  
Purposive Sampling ◽  
Octenidine Dihydrochloride ◽  
Significant Difference ◽  
Post Test ◽  
Infusion Method

ABSTRAK Pendahuluan: Antiseptik alkohol merupakan cairan antiseptik yang sering digunakan sebelum penusukan infus dalam pencegahan masuknya mikroorganisme. Pemberian antiseptik lain untuk kulit adalah Octenidine Dihydrochloride 0,1% yang terbukti efektif dalam melawan berbagai macam mikroorganisme, penutupan luka, dan tidak beracun. Octenidine Dihydrochloride 0,1% biasanya tidak dipakai dalam pengolesan antiseptik sebelum penusukan infus. Metode: Penelitian ini menggunakan metode eksperimen dengan Post-Test Only Design dan sampel dipilih dengan menggunakan metode Purposive sampling Hasil: Perolehan data nilai skala phlebitis dihitung menggunakan rumus median, kemudian dilanjutkan uji statisktik melalui uji Mann-Whitney didapatkan hasil tidak ada perbedaan angka yang signifikan dengan nilai p = 0,317 α > 0.05 dalam penurunan kejadian phlebitis kepada pasien rawat inap selama 3-4 hari perawatan. Diskusi: Kesimpulan penelitian ini menunjukkan tidak ada perbedaan angka kejadian phlebitis antara penggunaan antiseptik alkohol 70% dan Octenidine Dihydrochloride 0,1%. Octenidine Dihydrochloride 0,1% dapat digunakan sebagai antiseptik alternatif pada pemasangan infus.   Kata Kunci: Alkohol 70%, Octenidine Dihydrochloride 0,1%, Phlebitis   ABSTRACT Introduction: Antiseptic alcohol is a liquid antiseptic that is often used prior to insertion of the infusion in preventing the entry of microorganisms. Giving another antiseptic for skin is Octenidine Dihydrochloride 0.1% which proved effective against a variety of microorganisms, wound closure, and non-toxic. Octenidine Dihydrochloride 0.1% are usually not used in the application of an antiseptic before insertion of the infusion. Method: This study used an experimental method with Post-test Only Design and the sample was selected using purposive sampling method. Result: Data acquisition phlebitis scale value is calculated using the median, then proceed through the test statistics Mann-Whitney test showed no significant difference in the numbers, with p = 0.317 α> 0.05 decreased incidence of phlebitis in patients hospitalized for 3-4 days of treatment. Discussion: The conclusion of this study showed no difference in the incidence of phlebitis between the use of antiseptic alcohol 70% and Octenidine Dihydrochloride 0.1%. Octenidine Dihydrochloride 0.1% can be used as an antiseptic alternative to the infusion. Keywords: Alkohol 70%, Octenidine Dihydrochloride 0,1%, Phlebitis

scholarly journals PENGARUH JUS JERUK DAN MINUMAN BERKARBONASI TERHADAP KEKERASAN PERMUKAAN RESIN KOMPOSIT

2017 ◽  
Vol 4 (1) ◽  
pp. 38
Author(s):  
Rusna Fiki Kafalia ◽  
Muh. Dian Firdausy ◽  
Arlina Nurhapsari
Keyword(s):  
Vickers Hardness ◽  
Orange Juice ◽  
Composite Resin ◽  
Surface Hardness ◽  
Negative Control ◽  
Control Group ◽  
Control Group Design ◽  
Hardness Tester ◽  
Acid Agent ◽  
Group B

Background: Orange juice and Carbonat drink contains an acid agent which can affect the surface hardness of composite resin. Changes of surface hardness of composite resin is caused by infiltration of water containing the acid agent that affect the bonding of matrix to filler composite resin. This study purpose to determine the effect of immersed orange juice and carbonat drink on surface hardness of composite resin. Method: This was experimental laboratory study with a pre and post test control group design. The samples of composite resin had 12 mm in diameters and 2 mm in thickness (n=27). Composite resin used is FiltexTM Z350 XT shades A2. Samples were divided into three groups : group A immersed with orange juice, group B immersed with carbonat drink, and group C immersed with aquadest as the negative control. Samples were immersed for 24 hours. The pre and post immertion of composite resin surface hardness were measured with Micro Vickers Hardness Tester. Results: Post immertion Vickers hardness was compared by using one way anova test. The result showed that immersed orange juice and carbonat drink significantly reduced the surface hardness of composite resin (p < 0,05). Concluision: The conclusion Immersed carbonat drink more reduced the surface hardness of composite than orange juice. It is suggested to reduce the duration direct exprossure of consumption carbonat drink.

scholarly journals Perbedaan Perubahan Warna Permukaan Resin Komposit Nanohybrid Pasca Perendaman dalam Cuko Pempek (Saus Manis dan Asam) dan Jamu Kunyit Asam (Curcuma Domestica Val – Tamarindus Indica)

2019 ◽  
Vol 16 (2) ◽  
pp. 49
Author(s):  
Budiono Budiono ◽  
Nabila Farah Khoirunnisa ◽  
Seffy Vera Faylina
Keyword(s):  
Composite Resin ◽  
Color Change ◽  
Laboratory Research ◽  
Surface Color ◽  
Color Changes ◽  
Average Change ◽  
Post Test ◽  
Experimental Laboratory ◽  
Nanohybrid Composite ◽  
The Difference

The advantages of Nanohybrid composite resin are they have a smooth surface and greater strength, also minimal shrinkage. The disadvantages of composite resin are the color changes extrinsically and intrinsically. The color is changing extrinsically because of the dyes which attached to the surface of the composite resin and the color is changing intrinsically due to oxidation of monomers. Pempek and turmeric-tamarind herbal drink (jamu) are kind of foods and beverages that are very popular among Indonesian people, both of them are causing discoloration on the surface of the composite resin. The objective was to identify the difference composite resin color change after soaking in sweet and sour sauce (cuko pempek) and turmeric-tamarind herbal drink. This study was experimental laboratory research with pre-test and post-test research design. The samples were 32 pieces of Nanohybrid composite resin with the size of 10 x 2 mm. 16 samples of each test were soaked in 5 ml “cuko pempek” and turmeric-tamarind herbal drink in 37 0 C temperature in 7 days. The color change was measured using spechtrophotometer (UV-2401 PC). Results: There are differences between Nanohybrid composite resin surface color change which were soaked in “cuko pempek” and turmeric-tamarind herbal drink which marked in an average change of dE*ab “cuko pempek” (4.7244) and turmeric and tamarind herbal drink (39.1944). The results of independent T-Test also showed a significant color change that is p = 0,000 (p <0.05). This study concluded that there were differences between Nanohybrid composite resin surface color change which are soaked in “cuko pempek” and turmeric-tamarind herbal drink.

scholarly journals Pengaruh rendaman cuka (asam asetat) terhadap kekerasan amalgam

e-GIGI ◽  
2017 ◽  
Vol 5 (2) ◽  
Author(s):  
Rigel N.V. Taneh ◽  
Michael A. Leman ◽  
Johanna A. Khoman
Keyword(s):  
Vickers Hardness ◽  
Surface Hardness ◽  
T Test ◽  
Control Group ◽  
Filling Material ◽  
Control Group Design ◽  
Group Design ◽  
Hardness Tester ◽  
Post Test ◽  
The 19Th Century

Abstract: Amalgam filling has been used since the 19th century. The hardness of a filling material in the mouth may be affected by acidic drinks or foods. One of the foods normally consumed by the Indonesian is acidic due to its vinegar content. This study was aimed to determine the effect of vinegar on the change of amalgam hardness. This was a laboratory experimental study with a post test only control group design. There were 30 samples of amalgam plates with a diameter of 5 mm and 2 mm of thickness. The samples were divided into two groups with three different immersion times, as follows: 5, 10, and 20 minutes. After immersion, the samples’ hardness was measured by using the Micro Vickers Hardness Tester. Data normality was tested with Shapiro-Wilk test, then the data were statistically analyzed with independent sample t-test. The results showed a significant effect of vinegar immersion on changes in amalgam hardness (P <0.05). Conclusion: Vinegar immersion affected the hardness of amalgam.Keywords: amalgam, vinegar, surface hardness Abstrak: Amalgam merupakan bahan tumpatan yang digunakan sejak abad ke-19. Sifat keras suatu bahan tumpatan di dalam rongga mulut dapat dipengaruhi oleh minuman asam atau makanan yang dikonsumsi. Salah satu makanan yang biasanya dikonsumsi oleh orang Indonesia bersifat asam dan mengandung bahan cuka. Penelitian ini bertujuan untuk mengetahui pengaruh rendaman cuka terhadap perubahan kekerasan amalgam. Jenis penelitian ialah eksperimental laboratorik dengan desain post test only control group. Sampel penelitian ini ialah lempeng amalgam berbentuk lingkaran dengan ukuran diameter 5 mm dan tinggi 2 mm sebanyak 30 buah. Sampel dibagi menjadi dua kelompok dengan tiga durasi waktu perendaman yang berbeda yaitu 5, 10, dan 20 menit. Setelah perendaman, sampel diukur nilai kekerasannya menggunakan Micro Vickers Hardness Tester, kemudian dilakukan uji normalitas data menggunakan uji Shapiro-Wilk. Data dianalisis secara statistik dengan menggunakan uji independent sample t-test. Hasil penelitian menunjukkan adanya pengaruh bermakna dari perendaman cuka terhadap perubahan kekerasan amalgam (P < 0.05). Simpulan: Perendaman cuka memengaruhi kekerasan amalgam.Kata kunci: amalgam, cuka, kekerasan permukaan

scholarly journals UJI KEKERASAN KOMPOSIT TERHADAP RENDAMAN BUAH JERUK NIPIS (CITRUS AURANTIFOLIA)

e-GIGI ◽  
2015 ◽  
Vol 3 (1) ◽  
Author(s):  
Patar Sitanggang ◽  
Elita Tambunan ◽  
Jane Wuisan
Keyword(s):  
Vickers Hardness ◽  
Resin Composite ◽  
Surface Hardness ◽  
T Test ◽  
Control Group ◽  
Citrus Aurantifolia ◽  
Hardness Tester ◽  
Acid Agent ◽  
Post Test ◽  
Test Control

Abstract: Lime (Citrus aurantifolia) contains an acid agent which can affects the surface hardness of composite. Change of surface hardness of composite is caused by infiltration of water containing the acid agent that affects the bonding of matrix to filler of composite.This study aimed to determine the effect of immersed lime on surface hardness of composite. This was an experimental laboratory study with a pre and post test control group design. The samples of resin composite had 5 mm in diameters and 4 mm in thickness (n = 24). Samples were divided into two groups: mineral water as the control group and immersed lime as the trial group. Samples were alternately immersed for 30, 60, 120 minutes. Post immersion, the changes of composite hardness were measured with Mico Vickers Hardness Tester. Post immersion Vickers hardness was compared by using paired t-test. The result showed that immersed lime significantly reduced the surface hardness of composite (p<0.05). Duration of 60 and 120 minutes of lime immersion reduced significantly the surface hardness of composite (p<0.05). It is suggested to reduce the duration of acidic fruit exposure such as lime to the composite.Keywords: resin composite, surface hardness changes, limeAbstrak: Buah jeruk nipis (Citrus aurantifolia) mempunyai kandungan asa m yang dapat memengaruhi kekerasan komposit. Perubahan kekerasan komposit disebabkan oleh menyerapnya air yang mengandung asam pada komposit yang memengaruhi ikatan matriks dan filler. Penelitian ini bertujuan untuk mengetahui pengaruh perendaman buah jeruk nipis terhadap perubahan kekerasan komposit. Jenis penelitian ini ialah eksperimental laboratorium dengan desain pre and post test control group. Jumlah sampel penelitian ialah 24 resin komposit dengan diameter 5 mm dan tebal 4 mm. Sampel dibagi menjadi 2 kelompok yaitu kelompok kontrol air mineral dan kelompok perlakuan yang direndam dalam sari jeruk nipis dengan 3 durasi waktu yang berbeda 30, 60, dan 120 menit. Setelah perendaman diukur nilai perubahan kekerasan dengan Mico Vickers Hardness Tester. Hasil perendaman berdasarkan uji Vickers diuji banding secara statistik menggunakan uji paired sample t test. Hasil penelitian menunjukkan adanya pengaruh perendaman buah jeruk nipis terhadap perubahan kekerasan komposit (p<0,05). Pada durasi waktu 60 dan 120 menit terdapat pengurangan yang bermakna dari kekerasan permukaan resin komposit (p<0,05). Disarankan untuk mengurangi durasi paparan komposit terhadap buah-buahan yang mengandung asam seperti jeruk nipis.Kata kunci: resin komposit, perubahan kekerasan permukaan, jeruk nipis

scholarly journals PERENDAMAN DENGAN PERASAN BUAH JERUK LEMON (Citrus lemon) DAPAT MENURUNKAN KEKERASAN RESIN KOMPOSIT NANOHYBRID

2020 ◽  
Vol 16 (2) ◽  
pp. 49-53
Author(s):  
IGN Bagus Tista ◽  
◽  
IGAA Hartini Hartini ◽  
IA. Gitasanthi KDA ◽  
Keyword(s):  
Composite Resin ◽  
Applied Pressure ◽  
Surface Hardness ◽  
Composite Resins ◽  
Control Group ◽  
Control Group Design ◽  
Mechanical Condition ◽  
Hardness Tester ◽  
Significant Difference ◽  
Nanohybrid Composite

Composite resin is a restoration material that is often used because the composite resin has good aesthetic value like mimetic the teeth color. Composite resins have a physical and mechanical condition. One of the mechanical condition is hardness. The surface hardness of composite resins is the surface resistance of the composite resin material to the applied pressure. One of the factors influencing composite hardness is the food and beverages consumed. Consuming acidic drinks continuously for a long time period can erode composite resin filling. The purpose of this study was to determine the effect of soaking into a citrus lemon on the hardness of nanohybrid composite resin. This type of research was true experimental with pre-test post-test with control group design using 24 composite resin samples which are divided into 4 groups with 6 samples each. The groups in this study were nanohybrid composite resins soaked with citrus lemon and aqua dest for 60 minutes and 120 minutes. The hardness tested using a Vicker hardness tester. The results of the study using the LSD (Least Significant Difference) test showed that the significance value of p= 0.014 (p<0.05), which means that the use of citrus lemon for 120 minutes affected the hardness of nanohybrid composite resin. In conclusion, soaking with citrus lemon for 120 minutes reduces more the hardness of nanohybrid composite resin compared with soaking for 60 minutes.

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