UJI PENGARUH SALIVA BUATAN TERHADAP KEKUATAN TEKAN SEMEN IONOMER KACA TIPE II YANG DIRENDAM DALAM MINUMAN ISOTONIK

Abstract: The immersion of GIC type II in acid drink like isotonic drink could reduce the compressive strength (CS) of GIC type II. This is due to the matrix degradation process of GIC in acid condition. But on the other hand, there is artificial saliva that can neutralize this condition. Purpose: Purpose of this study was to evaluate the effect of artificial saliva on compressive strength of GIC type II immersed in isotonic drink. Method: The GIC specimens of 6mm x 6mm x 12mm (length x width x depth) were immersed for 24 hours in water, 24 hours in isotonic drink, 24 hours in isotonic drink and continue with 72 hours in artificial saliva, 48 hours in isotonic drink, and 48 hours in isotonic drink and continue with 144 hours in artificial saliva. The compressive strength was determined using Universal Testing Machine with a crosshead speed of 0.5 mm/min. Statistical analysis was performed by one-way ANOVA and post-hoc LSD test ( = 0.05). Result: Statistic test shows significant difference of CS (p<0,05). Conclusion: conclusion of this study artificial saliva gives effect to the rising of the compressive strength of GIC type II immersed in isotonic drink. Keywords: Isotonic drink, artificial saliva, compressive strength, Glass Ionomer Cement type II. Abstrak: Perendaman SIK tipe II dalam minuman asam seperti minuman isotonik dapat mengurangi kekuatan tekan SIK tipe II. Hal ini disebabkan proses degradasi matriks SIK pada kondisi asam. Namun di sisi lain, saliva buatan yang dapat menetralkan kondisi ini. Tujuan: untuk untuk mengetahui pengaruh saliva buatan terhadap kekuatan tekan SIK yang direndam dalam minuman isotonik. Metode: Spesimen SIK tipe II berukuran 6mm x 6mm x 12 mm (panjang x lebar x tinggi) direndam selama 24 jam dalam air, 24 jam di dalam minuman isotonik, 24 jam di dalam minuman isotonik dan lanjutkan dengan 72 jam pada saliva buatan, 48 jam di minuman isotonik, dan 48 jam di minum isotonik dan lanjutkan dengan 144 jam dalam saliva buatan. Kekuatan tekan diukur menggunakan Universal Testing Machine dengan kecepatan 0,5 mm / min. Analisis statistik dilakukan dengan one-way ANOVA dan post-hoc uji LSD ( = 0,05). Hasil: Uji statistik menunjukkan perbedaan yang signifikan dari kekuatan tekan (p <0,05). Simpulan: terdapat pengaruh saliva buatan terhadap kekuatan tekan SIK tipe II yang direndam dalam minuman isotonik. Kata kunci: minuman isotonik, saliva buatan, kekuatan tekan, Semen Ionomer Kaca tipe II.

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Saliva buatan meningkatkan kekuatan tekan semen ionomer kaca tipe II yang direndam dalam minuman isotonik (Artificial saliva increases the compressive strength of glass ionomer cement type II soaked in isotonic drinks)

Journal of Dentomaxillofacial Science ◽

10.15562/jdmfs.v13i2.397 ◽

2014 ◽

Vol 13 (2) ◽

pp. 101

Author(s):

Juliatri Juliatri ◽

D.H.C. Pangemanan ◽

Dwi Cahya Fitriyana

Keyword(s):

Compressive Strength ◽

Artificial Saliva ◽

Testing Machine ◽

Glass Ionomer Cement ◽

Degradation Process ◽

Type Ii ◽

Glass Ionomer ◽

Cement Type ◽

Significant Difference ◽

Ionomer Cement

Immersion of glass ionomer cement (GIC) type II in acid drink like isotonic drink could reduce its compressive strength.This is due to the matrix degradation process of GIC in acid condition. However, there is artificial saliva that canneutralize this condition. The purpose of this study was to evaluate the effect of artificial saliva on compressive strengthof glass ionomer cement type II immersed in isotonic drink. The GICspecimens of 6 x 6 x 12 mm3beam were immersed for24 hours in distilled water, 24 hours in isotonic drink, 24 hours in isotonic drink continued with 72 hours in artificial saliva,48 hours in isotonic drink, and 48 hours in isotonic drink continued with 144 hours in artificial saliva. The compressivestrength was measured using Universal Testing Machine with a crosshead speed of 0.5 mm/min. Statistical analysis wasperformed by one-way ANOVA and post-hoc LSD test (=0.05) showed a significant difference of compressive strength(p<0,05). It was concluded that artificial saliva increases the compressive strength of GIC immersed in isotonic drink.

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Pengaruh Jenis dan Volumetrik Fiber terhadap Kekuatan Transversal Reparasi Plat Resin Akrilik

Majalah Kedokteran Gigi Indonesia ◽

10.22146/majkedgiind.9021 ◽

2015 ◽

Vol 1 (1) ◽

pp. 102

Author(s):

Pramudya Aditama ◽

Siti Sunarintyas ◽

Widjijono Widjijono

Keyword(s):

Glass Fiber ◽

Glass Fibers ◽

Testing Machine ◽

Acrylic Resin ◽

Universal Testing Machine ◽

Transverse Strength ◽

Universal Testing ◽

Group I ◽

Significant Difference ◽

Post Hoc

Resin akrilik merupakan bahan yang sering digunakan dalam pembuatan basis gigi tiruan. Kelemahan resin akrilik adalah mudah patah. Salah satu cara untuk mengatasi masalah tersebut adalah dengan menambahkan polyethylene (PE) atau glass fiber. Tujuan dari penelitian ini untuk mengetahui pengaruh jenis dan volumetrik fiber terhadap kekuatan transversal reparasi plat resin akrilik. Penelitian ini menggunakan dua puluh lima plat resin akrilik kuring panas berukuran 65 x 10 x 2,5 mm. Subjek dipreparasi untuk membuat jarak 3 mm dan sudut bevel 45o. Subjek dibagi menjadi 5 kelompok, masingmasing kelompok terdiri dari 5 subjek. Kelompok 1 (kontrol) tanpa penambahan fiber, kelompok II dengan penambahan 3,7% v/v PE fiber, kelompok III dengan penambahan 7,4% v/v PE fiber, kelompok IV dengan penambahan 3,7% v/v E-glass fiber, dan kelompok V dengan penambahan 7,4% v/v E-glass fiber. Seluruh plat direndam dalam air destilasi selama satu hari pada suhu 37oC. Pengujian kekuatan transversal plat resin akrilik dengan menggunakan Universal Testing Machine dan data yang didapat dianalisis menggunakan ANAVA dua jalur dengan tingkat kepercayaan 95%. Rerata kekuatan transversal (MPa) reparasi plat resin akrilik yang diperkuat fiber: 3,7% v/v PE fiber (67,77±3,34); 7,4% v/v PE fiber (80,37±8,42); 3,7% v/v E-glass fiber (96,72±5,43); 7,4% v/v E-glass fiber (109,44±4,98); sedangkan reparasi plat resin yang tidak diperkuat fiber menghasilkan kekuatan transversal 56,27±4,7 MPa. Hasil analisis menggunakanANAVA dua jalur menunjukkan variabel jenis dan volumetrik fiber memberikan pengaruh signifikan (p<0,05), sedangkan interaksi antara jenis dan volumetrik fiber tidak berpengaruh signifikan (p>0,05). Uji post hoc Tukey menunjukkan perbedaan signifikan (p<0,05) untuk seluruh kelompok perlakuan. Penambahan E-glass fiber dalam reparasi plat resinakrilik mampu meningkatkan kekuatan transversal lebih tinggi dibandingkan dengan menggunakan PE fiber. Peningkatan volumetrik fiber dapat meningkatkan kekuatan transversal reparasi plat resin akrilik. Effect Of Type And Volumetric Fiber On Transverse Strength Of Acrylic Resin Plate Repair. Acrylic resin is the most common denture base material. A disadvantage of acrylic resin is that it is easily fractured. One way to resolve this problem is by adding polyethylene (PE) or glass fibers. The purpose of this research is to find out about the effect of type and volumetric fiber on transverse strength of acrylic resin plate repaired. The experiment involved twenty five plates of heat cured acrylic with the dimensions of 65 x 10 x 2.5 mm. The speciments were prepared to create a 3 mm gap and 45° bevel. The subjects were divided into 5 groups; each group consisted of 5. Group I (control) was without fiber reinforcement, group II reinforced with 3.7% v/v PE fiber, group III reinforced with 7.4% v/v PE fiber, group IV reinforced with 3.7% v/v E-glass fiber, and group V reinforced with 7.4% v/v E-glass fiber. All plates were soaked in distilled water for one day at 37° C temperature. The plates were tested for transverse strength with Universal Testing Machine and all data obtained were analyzed with two way ANOVA at 95% confidence level. The mean of transverse strength (MPa) of the acrylic resin plate repair reinforced with fiber: 3.7% v/v PE fiber was (67.77±3.34); 7.4% v/v PE fiber (80.37±8.42); 3.7% v/v E-glass fiber (96.72±5.43); 7.4% v/v E-glass fiber (109.44±4.98); while the transverse strength of the acrylic resin plate with no fiber reinforced was 56.27±4.7 MPa. Two way ANOVA analysis shows that type and volumetric fiber had significant effect (p<0.05), while the interaction between type and volumetric fiber had no significant effect (p>0.05). Tukey post hoc test shows significant difference (p<0.05) for all groups. The addition of E-glass fibers in the acrylic resin plate repaired increased the transverse strength higher than that with PE fibers. The increase in volumetric fibers might improve the transverse strength of the acrylic resin plate repaired.

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Compressive strength of calcium silicate-based cement

Stomatoloski glasnik Srbije ◽

10.2478/sdj-2018-0001 ◽

2018 ◽

Vol 65 (1) ◽

pp. 7-13

Author(s):

Vanja Opačić Galić ◽

Zoran Stamenić ◽

Violeta Petrović ◽

Vukoman Jokanović ◽

Slavoljub Živković

Keyword(s):

Compressive Strength ◽

Calcium Silicate ◽

Calcium Silicate Cement ◽

Crosshead Speed ◽

Universal Testing ◽

Significant Difference ◽

Calcium Silicate Cements ◽

Post Hoc ◽

One Way Anova ◽

Over Time

Summary Introduction The aim of this study was to compare compressive strength (Cs) of new nanostructural calcium silicate based cement (nCS) with commercial calcium silicate cement and conventional GIC. Methods Four nanostructural materials were tested: nanostructural calcium silicate based cement (nCS) (Jokanović et al.), MTA Plus (Cerkamed, Poland), Fuji IX (GC Corporation, Japan) and Ketac Universal Aplicap (3M ESPE, USA). Five samples of each material were mixed in accordance with manifecturer’s guidelines and positioned in metal moulds (ϕ4mm and 6mm). Compressive strength (Cs) expressed in MPa was determined after 24 hours, 7 days and 28 days respectively. Measurements were performed on universal testing equipment (Tinius Olsen, USA) at a crosshead speed of 1mm/min. For processing the results one-way ANOVA and post-hoc test were used. Results The highest values of compressive strength after 24h was found in conventional GIC Fuji IX (mean 38.56±13.31) and Ketac Universal (mean 40.77±7.96). Calcium silicate cements after 24h showed low values of compressive strength (MTA Plus 5.91±0.28 MPa, nCS 1.35±0.36 MPa). After 7 days, FUJI IX 47.42±9.33 MPa and Ketac Universal 35.25±10.60 MPa showed higher value of compressive strength than MTA Plus (15.09±2.77 MPa) and nCS (11.06±0.88 MPa). After 28 days the Cs value for conventional GIC Fuji IX was 48.03±7.82 MPa and Ketac Universal 36.65±11.13 MPa while for calcium silicate cements it was 16.47±1.89 MPa and nCS 14.39±1.63 MPa. There was statistically significant difference (p<0.05) in Cs between conventional GIC and CS cements after 24h, 7 and 28 days. Conclusions Calcium silicate cements initially showed lower values of compressive strength than conventional GIC that increased over time.

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Pengaruh bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit

Majalah Kedokteran Gigi Indonesia ◽

10.22146/majkedgiind.11235 ◽

2017 ◽

Vol 2 (1) ◽

pp. 35

Author(s):

Ema Mulyawati

Keyword(s):

Bond Strength ◽

Shear Bond Strength ◽

Composite Resin ◽

Artificial Saliva ◽

Testing Machine ◽

Group Iii ◽

Universal Testing Machine ◽

Universal Testing ◽

Group I ◽

Significant Difference

The Effect of desensitizing agent in post-extracoronal bleaching on shear bond strength of composite resin. The dentinal hypersensitivity is a common condition among patients after extracoronal bleaching treatment that usually needs the application of desensitizing agent. The purpose of this study was to evaluate the composite resin restoration shear bond strength with and without desensitizing application after extracoronal bleaching using 40% of H2O2. Twenty one extracted permanent human incisor teeth were randomly divided into 3 groups of 7 each. Group I was with the application of 40% H2O2 without any desensitizing agent. Group II was with the application of 40% of H2O2 with desensitizing agent and group III served as the control. The teeth were immersed in artificial saliva and stored in 37 °C incubator for 7 days. The teeth were restored using composite resin. After restoring the shear bond strength of composite resin was tested using a universal testing machine. Result and conclusion. there is no significant difference between bleaching group with and without desensitizing agent. The application of desensitizing agent after extracoronal bleaching did not impact the composite resin shear bond strength.ABSTRAKDentin hipersensitif merupakan kondisi yang biasa dialami pasien setelah perawatan bleaching ekstrakoronal yang biasanya memerlukan aplikasi bahan desensitasi. Penelitian ini bertujuan untuk mengetahui pengaruh bahan desensitasi pasca bleaching ekstrakoronal menggunakan H2O2 40% terhadap kekutan geser pelekatan restorasi resin komposit. Dua puluh satu gigi permanen insisivus yang telah dicabut dibagi dalam tiga kelompok masing-masing 7 gigi. Kelompok I dilakukan bleaching ekstrakoronal dengan H2O2 tanpa bahan desensitasi. Kelompok II dilakukan bleaching setelah itu diaplikasikan bahan desensitasi dan kelompok III sebagai kelompok kontrol. Semua gigi-gigi tersebut di rendam dalam saliva buatan dan dimasukkan inkubator selama 7 hari pada suhu 37 °C. Selanjutnya seluruh gigi dilakukan restorasi resin komposit menggunakan light cure halogen. Setelah itu dilakukan pengujian kekuatan geser pelekatan menggunakan universal testing machine. Data dianalisis menggunakan uji Kruskal - Wallis. Hasil penelitian menunjukkan bahwa tidak ada perbedaan kekuatan geser pelekatan pada semua kelompok perlakuan (p > 0,05). Dari penelitian ini disimpulkan bahwa tidak terdapat pengaruh aplikasi bahan desensitasi pasca bleaching ekstrakoronal terhadap kekuatan geser pelekatan restorasi resin komposit.

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Effect Of Accelerating Aging On Retention And The Release Period Of Clips In A Bar Retained Maxillary Implant Overdenture

Integrative Journal of Medical Sciences ◽

10.15342/ijms.2021.385 ◽

2021 ◽

Vol 8 ◽

Author(s):

Dalia El naggar ◽

Ahmed Mohamed Alam-Eldein ◽

Maha Mostafa Halim ◽

Hoda Mohammed Amin Rashad

Keyword(s):

Testing Machine ◽

Accelerated Aging ◽

The Other ◽

Universal Testing Machine ◽

Universal Testing ◽

Retention Loss ◽

Significant Difference ◽

Implant Overdenture

Objectives: This study was made to detect the effect of accelerating aging on retention and measuring the release period of clips in a 2 and 3 bar retained maxillary implant overdenture. Materials and Methods: Four implants were placed in two maxillary edentulous epoxy models. One model had two bar attachments with two clips overdenture while the other model had three bar attachments with three clips in the overdenture. Retention and release period of the clips were checked before applying insertion removal cycles. Retention was measured using universal testing machine after 540 cycles (6 months) and 1080 cycles (1 year) of insertion removal on a chewing simulator.Results and Conclusions: There was a significant difference in retention and release period between two bars and three bars implant retained maxillary overdentures. A significant difference was also seen in each group after accelerated aging. Therefore, the three bar implant retained overdenture had higher retention values than two bar. Retention loss occurred in both groups after the insertion removal cycles. Release period value was lower in two bar overdenture than three bar overdenture.

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The Effect of Thermoforming on Tear Strength of Ethylene Vinyl Acetate Mouthguard Material in Various Thicknesses

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.751.657 ◽

2017 ◽

Vol 751 ◽

pp. 657-662

Author(s):

Phakphum Srinuan ◽

Jeerapatr O. Baiyokvichit ◽

Rasana Boonpeng ◽

Tanapol Wongwisatekit ◽

Pacharaporn Pattanasukwasan ◽

...

Keyword(s):

Vinyl Acetate ◽

Testing Machine ◽

Ethylene Vinyl Acetate ◽

Strength Test ◽

Tear Strength ◽

Universal Testing ◽

Significant Difference ◽

The Mean ◽

Thermoforming Process ◽

One Way Anova

The effect of thermoforming on the tear strength of ethylene vinyl acetate (EVA) mouthguard material (Bioplast®) has not been widely investigated. The present study compared the tear strengths of non-processed and processed EVA specimens in various thicknesses. Two groups of EVA sheet (non-processed and processed) in three different thicknesses of 3, 4 and 5 mm were used in specimen fabrication. The processed EVA sheets were achieved by forming the EVA sheet on the cylindrical stone model with the pressure-molding device (Biostar®). Twelve of tear strength specimens of non-processed and processed group in each thickness were prepared following the modified ASTM D 624-00 guideline. The tear strength test was conducted using universal testing machine (Lloyd® 1K series) with the speed of 500 mm/min. The mean thickness and tear strength of the non-processed and processed specimens in each thickness were compared using independent T-test. The differences in the mean tear strength for each thickness of non-processed and process specimens were determined using one-way ANOVA. The mean tear strength and mean thickness of processed EVA specimens was significantly lower than the non-processed EVA specimens for every thickness (P ≤ 0.05). There was no significant difference in the mean tear strength of EVA specimens among each thickness in both non-processed and processed groups. It can be concluded that the thermoforming process has the significant effect on the tear strength of the EVA mouthguard material formed by pressure molding device in every thicknesses. The tear strength of processed specimens were significant lower than the non-processed. Thus, it is more relevant for testing properties of the processed mouthguard material that the mouthguard material before processing.

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Compressive strength of glass ionomer cements using different specimen dimensions

Brazilian Oral Research ◽

10.1590/s1806-83242007000300003 ◽

2007 ◽

Vol 21 (3) ◽

pp. 204-208 ◽

Cited By ~ 7

Author(s):

André Mallmann ◽

Jane Clei Oliveira Ataíde ◽

Rosa Amoedo ◽

Paulo Vicente Rocha ◽

Letícia Borges Jacques

Keyword(s):

Compressive Strength ◽

Testing Machine ◽

Glass Ionomer Cement ◽

Strength Test ◽

Glass Ionomer Cements ◽

Glass Ionomer ◽

Universal Testing ◽

Resin Modified Glass Ionomer ◽

Compressive Strength Test ◽

Ionomer Cement

The purpose of this study was to evaluate the compressive strength of two glass ionomer cements, a conventional one (Vitro Fil® - DFL) and a resin-modified material (Vitro Fil LC® - DFL), using two test specimen dimensions: One with 6 mm in height and 4 mm in diameter and the other with 12 mm in height and 6 mm in diameter, according to the ISO 7489:1986 specification and the ANSI/ADA Specification No. 66 for Dental Glass Ionomer Cement, respectively. Ten specimens were fabricated with each material and for each size, in a total of 40 specimens. They were stored in distilled water for 24 hours and then subjected to a compressive strength test in a universal testing machine (EMIC), at a crosshead speed of 0.5 mm/min. The data were statistically analyzed using the Kruskal-Wallis test (5%). Mean compressive strength values (MPa) were: 54.00 ± 6.6 and 105.10 ± 17.3 for the 12 mm x 6 mm sample using Vitro Fil and Vitro Fil LC, respectively, and 46.00 ± 3.8 and 91.10 ± 8.2 for the 6 mm x 4 mm sample using Vitro Fil and Vitro Fil LC, respectively. The resin-modified glass ionomer cement obtained the best results, irrespective of specimen dimensions. For both glass ionomer materials, the 12 mm x 6 mm matrix led to higher compressive strength results than the 6 mm x 4 mm matrix. A higher variability in results was observed when the glass ionomer cements were used in the larger matrices.

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Effects of various liquid-to-powder ratios on the compressive strength of calcium enriched mixture: Original research

Journal of Dental Research Dental Clinics Dental Prospects ◽

10.34172/joddd.2021.022 ◽

2021 ◽

Vol 15 (2) ◽

pp. 129-132

Author(s):

Mohammad Forough Reyhani ◽

Sheida Hosseinian Ahangarnezhad ◽

Negin Ghasemi ◽

Amin Salem Milani

Keyword(s):

Compressive Strength ◽

Testing Machine ◽

Original Research ◽

Significance Level ◽

Cem Cement ◽

Universal Testing ◽

Demineralized Water ◽

Compressive Strength Test ◽

The Mean ◽

One Way Anova

Background. Calcium-enriched mixture (CEM) cement has been introduced and marketed as a biomaterial for use in furcal perforation repair and apexogenesis procedures, in which the compressive strength that indicates the material’s resistance against crushing is of utmost importance. This study evaluated the effect of various liquid-to-powder ratios on CEM cement’s compressive strength. Methods. One gram of the cement was mixed with 0.5, 0.34, and 0.25 mL of demineralized water and transferred to stainless steel molds (6 and 4 mm in height and diameter, respectively). Five cells in the mold were considered for each group. The compressive strength test was conducted using the universal testing machine after incubating for seven days under 95% humidity at 37°C. One-way ANOVA was applied for data analysis at P≤0.05 significance level. Results. The mean compressive strength in the liquid-to-powder ratios of 0.5, 0.34, and 0.25 were 3.4456, 3.2960, and 3.3485, respectively, with no significant differences between them. Conclusion. Under this study’s limitations, changing the liquid-to-powder ratio did not affect CEM cement’s compressive strength.

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Pengaruh penambahan hidroksiapatit terhadap porositas dan compressive strength basis resin akrilik heat-curedEffect of hydroxyapatite addition towards porosity level and compressive strength of heat-cured acrylic resin base

Jurnal Kedokteran Gigi Universitas Padjadjaran ◽

10.24198/jkg.v32i2.26627 ◽

2020 ◽

Vol 32 (2) ◽

pp. 91

Author(s):

Chaterina Diyah Nanik Kusumawardani ◽

Ronaldo Triputro Chondro ◽

Ivan Andrian ◽

Rima Parwati Sari

Keyword(s):

Compressive Strength ◽

Testing Machine ◽

Acrylic Resin ◽

Load Cell ◽

Control Group ◽

Porosity Level ◽

Universal Testing ◽

White Spots ◽

Sem Imaging ◽

One Way Anova

Pendahuluan: Resin akrilik heat cured (HC) merupakan pilihan utama bahan sebagai basis gigi tiruan. Hidroksiapatit (HAP) adalah molekul kristalin yang sudah banyak digunakan di kedokteran gigi. Penelitian terdahulu membuktikan bahwa HAP mampu mengurangi monomer sisa pada resin akrilik HC, yang akan mengurangi juga porositas resin akrilik tersebut. Berkurangnya porositas resin akrilik, diharapkan akan meningkatkan kekuatan mekanik resin akrilik tersebut. Tujuan penelitian menganalisis pengaruh penambahan hidroksiapatit terhadap porositas dan compressive strength resin akrilik HC. Metode: Jenis penelitian eksperimental laboratoris. Sampel penelitian 20 resin akrilik HC berbentuk silindris (6x3mm), dibagi menjadi 4 kelompok. Kelompok kontrol (tanpa penambahan HAP), kelompok HAP 2%, kelompok HAP 5%, dan kelompok HAP 10%. Permukaan sampel diteliti menggunakan SEM untuk porositasnya. Penghitungan compressive strength sampel menggunakan Universal Testing Machine (load cell 300kg/mm2). Hasil: Uji one-way ANOVA dan Tukey-HSD menunjukkan perbedaan signifikan (p<0,05) antara kelompok kontrol (90±13,5MPa) dengan 5%HAP (105±4,3MPa) dan 10%HAP (113±10,2MPa), begitu pula antara 2%HAP (96±8,4MPa) dengan 10%HAP. Uji SEM menunjukkan tidak adanya reaksi kimia antara HAP dan resin akrilik HC. Tampak pula bercak putih tersebar tidak merata pada permukaan sampel akrilik di kelompok-kelompok perlakuan. Bercak putih ditemukan meningkat sebanding dengan peningkatan konsentrasi HAP, dengan diameter yang semakin besar. Simpulan: Penambahan HAP pada basis resin akrilik HC mampu menurunkan tingkat porositas dan meningkatkan nilai compressive strength. Penurunan tingkat porositas meningkat seiring dengan penambahan HAP. Compressive strength yang paling tinggi didapatkan pada basis resin akrilik heat cured dengan penambahan 10% hidroksiapatit.Kata kunci: Compressive strength, uji SEM, resin akrilik heat cured, hidroksiapatit. ABSTRACT Introduction: Heat-cured acrylic resin has been commonly used as a denture base, whereas hydroxyapatite (HAP) is a crystalline molecule widely used in the field of dentistry. Previous research has been proofed that HAP could reduce the residual monomer of heat-cured acrylic resin, which will reduce the porosity level in advance, so it was expected for better mechanical properties. This research was aimed to analyse the effect of HAP addition towards the porosity level and compressive strength of heat-cured acrylic resin. Methods: An experimental laboratory research was conducted towards 20 cylindrical samples (6 x 3 mm) of heat-cured acrylic resins, which were divided into four groups: Control group (without HAP addition), 2% HAP addition group, 5% HAP addition group, and 10% HAP addition group. Compressive strength was tested using Universal Testing Machine (load cell of 300kg / mm2). Each sample surface porosity was observed using the scanning electron microscope (SEM). Results: One-way ANOVA and Tukey-HSD tests results showed significant differences (p < 0.05) between compressive strength in the control group (90 ± 13.5 MPa) compared to 5% (105 ± 4.3 MPa) and 10% HAP addition group (113 ± 10.2 MPa), significant differences were also shown between the 2% (96±8.4MPa) and 10% HAP addition group. SEM imaging showed that there was no chemical reaction between HAP and heat-cured acrylic resin. It showed uneven white spots in acrylic sample’s surface in all treatment groups. Those white spots were likely to be found more in the higher concentration of HAP, so did the diameter of white spots was also found more in the higher concentration. Conclusion: The addition of hydroxyapatite to the base of heat-cured acrylic resin can reduce the level of porosity and increase the compressive strength value. The decrease in the porosity level increases with the addition of hydroxyapatite. The highest compressive strength is obtained with the addition of 10% hydroxyapatite.Keywords: Compressive strength, SEM imaging, heat-cured acrylic resin, hydroxyapatite.

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Comparison of Microleakage and Compressive Strength of Different Base Materials

THE JOURNAL OF THE KOREAN ACADEMY OF PEDTATRIC DENTISTRY ◽

10.5933/jkapd.2021.48.2.168 ◽

2021 ◽

Vol 48 (2) ◽

pp. 168-175

Author(s):

Eunyeong Jang ◽

Jaesik Lee ◽

Soonhyeun Nam ◽

Taeyub Kwon ◽

Hyunjung Kim

Keyword(s):

Methylene Blue ◽

Compressive Strength ◽

Composite Resin ◽

Testing Machine ◽

Base Material ◽

Methylene Blue Solution ◽

Universal Testing Machine ◽

Base Materials ◽

Universal Testing ◽

Blue Solution

This study compared the microleakages and compressive strengths of various base materials. To evaluate microleakages, 50 extracted permanent premolars were prepared. The teeth divided into 5 groups of 10 each according to the base materials. Cavities with a 5.0 mm width, 3.0 mm length, and 3.0 mm depth were formed on the buccal surfaces of the teeth. After filling the cavities with different base materials, a composite resin was used for final restoration. Each specimen was immersed in 2% methylene blue solution and then observed under a stereoscopic microscope (× 30). To evaluate the compressive strength, 5 cylindrical specimens were prepared for each base material. A universal testing machine was used to measure the compressive strength. The microleakage was highest in the Riva light cureTM group and lowest in the BiodentineTM and Well-RootTM PT groups. For the compressive strengths, in all groups, acceptable strength values for base materials were found. The highest compressive strength was observed in the Fuji II LCTM group and the lowest strength in the Well-RootTM PT group.

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