Flexural Strength Evaluation of Dental Post Prototype Contain ZAS-PMMA Composite Fiber with Electrospinning Methods

2019 ◽  
Vol 829 ◽  
pp. 93-99
Author(s):  
Nina Djustiana ◽  
Yanwar Faza ◽  
Elin Karlina ◽  
Zulia Hasratiningsih ◽  
Muhammad Miftahul Munir ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Sol Gel ◽  
Ceramic Powder ◽  
Testing Machine ◽  
Composite Fiber ◽  
P Value ◽  
Fiber Post ◽  
Test Analysis ◽  
Electrospinning Method ◽  
Dental Post

Composite fiber were already developed and looked promising in dentistry. PMMA, optically clear polymer, was combined with high mechanically properties ZrO2-Al2O3-SiO2 (ZAS) ceramic powder to improve the flexural strength value of dental post prototype. ZAS powder, with ratio 60:20:20, were first prepared via sol-gel technique. Afterwards, PMMA was dissolved in acetone then incorporate with ZAS powder 1% wt to gain ZAS-PMMA composite fiber via electrospinning method. Dental post prototype were fabricated into two groups, one group contain ZAS-PMMA composite fibers and one group contain neat BisGMA, as control, with amount of each groups samples was 10. As-prepared samples were tested by Universal Testing Machine (UTM) to evaluate the flexural strength values. Based on unpaired T-test analysis (p value < 0.05), the composite fiber post is significantly higher (48.17 %) than the neat BisGMA post. ZAS-PMMA composite fiber post was potential to be used as dental endodontic post in anterior.

scholarly journals Flexural properties of electrospun polymethyl methacrylate microfiber-reinforced BisGMA for dental post prefabrication

2021 ◽  
Vol 33 (3) ◽  
pp. 264
Author(s):  
Nina Djustiana ◽  
Yanwar Faza ◽  
Arief Cahyanto
Keyword(s):  
Flexural Strength ◽  
Polymethyl Methacrylate ◽  
Flexural Modulus ◽  
Testing Machine ◽  
Resin Matrix ◽  
Flexural Properties ◽  
P Value ◽  
Fiber Morphology ◽  
Tooth Structure ◽  
Dental Post

Introduction: A dental post is a restoration to preserve the remaining tooth structure thus can be functioned normally. Many researchers suggested a fiber dental post due to its biomechanical properties that are similar to dentin structure. This study aims to analyse the flexural properties of electrospun polymethyl methacrylate microfiber-reinforced BisGMA for dental post prefabrication. Methods: The sample used was following the ADA guideline, as well as for the number of samples. The sample size was 25×2×2mm, which is close to the average dental post size. PMMA microfibers were prepared by dissolving heat cure PMMA powder with 99% acetone, then electrospinning with a rotary collector. Acquired PMMA microfibers were immersed into the resin matrix containing BisGMA, camphorquinone, and 2-dimethylaminoethyl methacrylate (DMAEMA) as a monomer, initiator, and co-initiator, respectively, to prepare the dental posts. Results: PMMA microfibers structure and surface fracture of dental posts were confirmed by Scanning Electron Microscopy (SEM). PMMA microfibers show unaligned fiber morphology with an approximate diameter size of 1-5 µm.  A universal testing machine was used to measure the dental post's flexural properties (flexural strength and flexural modulus). Dental posts with PMMA fibers showed higher flexural strength (83.5 ± 10.7 MPa) compared to the dental post without PMMA fibers (61.7 ± 3.03 MPa) with a p-value <0.05. On the other hand, PMMA fibers' addition did not significantly increase the dental post's flexural modulus. Conclusion: The PMMA microfibers can intimately adhere to the BisGMA mixture as the resin matrix. Therefore, the PMMA microfiber significantly improves the flexural strength of the BisGMA for dental post prefabrication.

scholarly journals Comparative analysis of flexural strength of abraded and polished porcelain surfaces – an in vitro study

2021 ◽  
Vol 14 (1) ◽  
pp. 61-67
Author(s):  
Prathibha Nandagiri ◽  
◽  
Mamidi Praveen ◽  
Shikha Singh ◽  
Monika Singh ◽  
...  
Keyword(s):  
Flexural Strength ◽  
Testing Machine ◽  
The Other ◽  
Control Group ◽  
P Value ◽  
Diamond Bur ◽  
Significant Difference ◽  
Fine Diamond ◽  
Ceramic Restorations

Typically, prosthodontists adjust ceramic restorations glazed surface by grinding prior to insertion. Such alterations of surfaces are necessary for the correction of occlusal interferences. We aimed to evaluate and compare the change in flexural strength of ceramic surfaces after re-glazing and polishing. This study included 40 samples of ceramic blocks that were fabricated and glazed, and then fired in accordance with the manufacturer’s recommendations. The sample was randomly divided into four groups of 10 samples each. The first group was the control group with unaltered glazed samples. The second group was abraded with an extra-fine diamond bur followed by re-glazing, and the other two groups were polished with two commercially available polishing kits after abrading them with an extra-fine diamond bur. The samples were tested for their flexural strength using a universal testing machine. On the application of the F test on the means of all the groups, a value greater than 0.05 was found, which meant that there is no statistically significant difference in flexural strength values between the groups (P-value>0.05). Since the flexural strength values of the polished group were comparable to the other groups, polishing can be used instead of re-glazing for ceramic restorations. This reduces an additional clinical appointment for the patient and saves working time.

scholarly journals Surface Properties of Polymer Resins Fabricated with Subtractive and Additive Manufacturing Techniques

Polymers ◽  
2021 ◽  
Vol 13 (23) ◽  
pp. 4077
Author(s):  
Amal S. Al-Qahtani ◽  
Huda I. Tulbah ◽  
Mashael Binhasan ◽  
Maria S. Abbasi ◽  
Naseer Ahmed ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Flexural Strength ◽  
Testing Machine ◽  
Study Groups ◽  
Bending Test ◽  
P Value ◽  
Micro Hardness ◽  
Significant Difference ◽  
Cad Cam ◽  
Manufacturing Techniques

This study aimed to compare the surface roughness, hardness, and flexure strength of interim indirect resin restorations fabricated with CAD-CAM (CC), 3D printing (3D), and conventional techniques (CV). Twenty disk (3 mm × Ø10 mm) and ten bar specimens (25 × 2 × 2 mm) were fabricated for the CC, 3D, and CV groups, to be used for surface roughness, micro-hardness, and flexural strength testing using standardized protocol. Three indentations for Vickers micro-hardness (VHN) were performed on each disk and an average was identified for each specimen. Surface micro-roughness (Ra) was calculated in micrometers (μm) using a 3D optical non-contact surface microscope. A three-point bending test with a universal testing machine was utilized for assessing flexural strength. The load was applied at a crosshead speed of 3 mm/min over a distance of 25 mm until fracture. Means and standard deviations were compared using ANOVA and post hoc Tukey–Kramer tests, and a p-value of ≤0.05 was considered statistically significant. Ra was significantly different among the study groups (p < 0.05). Surface roughness among the CC and CV groups was statistically comparable (p > 0.05). However, 3D showed significantly higher Ra compared to CC and CV samples (p < 0.05). Micro-hardness was significantly higher in 3D samples (p < 0.05) compared to CC and CV specimens. In addition, CC and CV showed comparable micro-hardness (p > 0.05). A significant difference in flexural strength was observed among the study groups (p < 0.05). CC and 3D showed comparable strength outcomes (p > 0.05), although CV specimens showed significantly lower (p < 0.05) strength compared to CC and 3D samples. The 3D-printed provisional restorative resins showed flexural strength and micro-hardness comparable to CAD-CAM fabricated specimens, and surface micro-roughness for printed specimens was considerably higher compared to CAD-CAM and conventional fabrication techniques.

scholarly journals Evaluation of the effect of calcium hydroxide and endodontic irrigants on the push-out bond strength of fiber post - an in vitro study

2018 ◽  
Vol 91 (4) ◽  
pp. 458-461
Author(s):  
Anjum Chaudhary ◽  
Mohit Kumar ◽  
Sonali Taneja
Keyword(s):  
Bond Strength ◽  
Calcium Hydroxide ◽  
Testing Machine ◽  
In Vitro Study ◽  
Cervical Region ◽  
Control Group ◽  
P Value ◽  
Fiber Post ◽  
Push Out

Background. In recent years, fibre-reinforced composite posts have been proposed for the restoration of root filled teeth as an alternative to pre-fabricated posts or metal dowels.Aims and objectives. The aim of the study was to analyze the effect of endodontic irrigants used for removal of calcium hydroxide on the push-out bond strength of fiber posts to root canal dentin.Methods. Forty human permanent single-rooted mandibular premolars with relatively straight roots were taken and access cavities were prepared and biomechanical preparation done using Rotar Y protaper file till size F2. The samples were divided into Experimental group and Control group. In Experimental groups Intracanal dressing of calcium hydroxide was removed by 2.5% NaOCl and 17% EDTA (Group1), MTAD (Group II) and Qmix (Group III). Control group did not receive Intracanal calcium hydroxide dressing. Canals were obturated using size F2 protaper gutta-percha points and AH plus sealer. After storage for 24 hours, post space was prepared. Forty Tenax fiber post (Coltene) were cemented with Rely X U200 resin. The roots were then transversally sectioned into 3 slices of 1mm thickness corresponding to cervical, middle and apical third. The slices obtained were subjected to micro-push-out bond strength test using a universal testing machine. The data obtained was subjected to statistical analysis using One-Way ANOVA test. P value of .05 was considered as statistically significant level.Results. The mean push-out bond strength values for controls, NaOCl/EDTA, MTAD and QMIX group at cervical third were 10.17, 15.84, 20.39 and 20.98 whereas at apical third 4.78, 8.85, 11.66 and 12.10.Conclusion. Qmix showed higher push-out bond strength values followed by MTAD and NaOCl/EDTA. All the groups showed lowest push-out bond strength values in the apical third followed by middle and the maximum in the cervical region.

Magnesium Based Sol-Gel Derived Bioactive Glass Ceramics for Dental Tissue Regeneration

2011 ◽  
Vol 493-494 ◽  
pp. 884-889 ◽  
Author(s):  
Ourania Menti Goudouri ◽  
Eleni Theodosoglou ◽  
Anna Theocharidou ◽  
Eleana Kontonasaki ◽  
Lambrini Papadopoulou ◽  
...  
Keyword(s):  
Mechanical Properties ◽  
Flexural Strength ◽  
Tissue Regeneration ◽  
Sol Gel ◽  
Testing Machine ◽  
Glass Ceramics ◽  
High Rate ◽  
Apatite Formation ◽  
Dental Tissue ◽  
Dental Tissues

Scaffold-based tooth engineering is currently the most popular approach towards replacing dental tissues or even engineering a bio-tooth. Although, various scaffold materials have been employed in tooth regeneration, the scaffold-based tooth design has, until now, achieved only limited success. Recently, bioactive Mg-based ceramics have attracted interest as Mg plays an important role on skeletal metabolism and affects the quality and structure of hard dental tissues. Mg has been reported to improve the mechanical properties of calcium phosphate ceramics, control biodegradation rate and stabilize the cell-material interface improving cell attachment and growth. The aim of this study was the development of an experimental Mg-based ceramic material, with enhanced bioactivity and adequate mechanical properties, in order to be potentially used in dental tissue regeneration. The Mg-based ceramic was prepared by the sol-gel method, while the stabilization was performed at 1300, 1400 and 1450oC in order a fully crystalline material to be obtained. The characterization of the materials -before and after immersion is Simulated Body Fluid (SBF)- was performed by Fourier Tranform Infrared Spectroscopy (FTIR), X-Ray Diffractometry (XRD) and Scanning Electron Microscopy associated with an EDS analyzer (SEM-EDS), while the flexural strength of uniaxially pressed pellets was measured using a universal testing machine for 3- point bending tests (Instron 3344). FTIR spectra and XRD patterns of all powder samples before immersion in SBF solution confirmed the presence of three crystalline phases; akermanite, merwinite and diopside. The onset of apatite formation on the surface of all powders was observed even after three days of immersion, while the apatite formation on the surface of the sintered pellets was slightly delayed. Flexural strength values were in the range of 30Mpa. In conclusion, Mg-based glass-ceramics attain adequate mechanical integrity and high rate of bioactivity and could be potentially used in the construction of ceramic scaffolds for dental tissue regeneration.

Analisis Informasi Citra Anatomi Vaskular dengan Multi Planar Reformating (MPR) dan Maximum Intensity Projection (MIP) pada Fase Early Arteri Pemeriksaan MSCT Abdomen

2017 ◽  
Vol 3 (2) ◽  
pp. 240-244
Author(s):  
Ratna Istiningrum ◽  
Fatimah Fatimah ◽  
Tri Wulanhandarini
Keyword(s):  
Maximum Intensity Projection ◽  
Arterial Phase ◽  
P Value ◽  
Post Processing ◽  
Test Analysis ◽  
Vascular Abnormalities ◽  
Kappa Test ◽  
Anatomical Image ◽  
Parametric Statistical Test ◽  
Early Arterial Phase

Background: The development in the field of image reconstruction is growing rapidly along with the development of  CT Scan. In  the early stages of  MSCT abdominal artery is usually found  various kinds of vascular abnormalities such as stenosis, aneurism and others. Post processing image techniques commonly used include MPR and MIP. The purpose of this study is to determine whether there is a difference between MPR and MIP techniques and to know which one is better between the two.Methods: This  research was  quantitative study with experimental approach. The study was conducted at Bhakti Dharma Husada Surabaya Hospital  with 15 samples by performing reconstruction on vascular anatomical image of coronal examination of  abdominal MSCT. Assessment of anatomical information data is done by 2 respondents. Data analysis was done by kappa test followed by Wilcoxon sign rank test.Result : The results showed the difference between the post-processing of MIP and MPR on the coronal stages of the early arterial phase of the abdominal MSCT examination, based on the results of  non-parametric statistical test analysis (Wilcoxon) showed  a significant value of p value = 0.001. The result of MIP mean rank value (8,46) is higher than the mean rank value of MPR (1,50), it can be known that post proceeding MIP technique on coronal phase cuts early arterial examination of abdominal MSCT produces better anatomical image information.Conclusion: On examination of abdominal MSCT in the early arterial phase should be at the time of processing the image is also done by using post-processing MIP because more clearly than the MPR.

POLA ASUH ORANGTUA TERHADAP TINGKAT KEMANDIRIAN PERSONAL HYGIENE CUCI TANGAN DAN GOSOK GIGI PADA ANAK PRASEKOLAH

2020 ◽  
Vol 15 (2) ◽  
pp. 200-205
Author(s):  
Dina Dewi Anggraini
Keyword(s):  
Survey Research ◽  
Quantitative Study ◽  
Parenting Style ◽  
Cross Sectional Study ◽  
Personal Hygiene ◽  
P Value ◽  
Sectional Study ◽  
Cross Sectional ◽  
Test Analysis ◽  
The Relationship

ABSTRACT   The study aims todetermine the relationship between parenting style and the level of independence of Personal Hygiene Hand Wasting and Tooth Brush in Preschoolers in Kindergarten Negeri Pembina Blora in 2019. The study is a quantitative study, based on the research location including the type of field reseaerch, based on the ansence of the treatment of subjects including survey research, based on time is a cross sectional study, and based on objectives includin correlation analytics. The population in this study were all parents in Kindergarten Negeri Pembina Blora as many as 85 respondents. Based on the sample calculation, the sample obtained in this study that most parent in Kindergarten Negeri Pembina Blora amounted to 70 respondents. Srearmen’s rho test analysis results parenting parents with the level of independence of personal hygiene hand wasting result obtained p value = 0,000 < α (0,05), and parenting patters with the independence of personal hygiene tooth brush obtained results p value = 0,000 < α (0,05). So it can be concluded that were is a significant relationship between parenting parents with the level of independence of personal hygiene washing hands and brushing their tooth at preschoolers in Kindergarten Negeri Pembina Blora in 2019. Keywords: parenting; personal hygiene, preschool ABSTRAK   Penelitian ini bertujuan untuk mengetahui Hubungan Pola Asuh Orangtua Terhadap Tingkat Kemandirian Personal Hygiene Cuci Tangan dan Gogok Gigi pada Anak Prasekolah di TK Negeri Pembina Blora Tahun 2019. Penelitian ini adalah penelitian kuantitatif, berdasarkan tempat penelitian termasuk jenis penelitian lapangan, berdasarkan tidak adanya perlakuan terhadap subjek termasuk penelitian survey, berdasarkan waktu merupakan penelitian cross sectional, dan berdasarkan tujuan termasuk analitik korelasi. Populasi dalam penelitian ini adalah seluruh orangtua di TK Negeri Pembina Blora sebanyak 85 responden. Berdasarkan perhitungan sampel  maka diperoleh sampel pada penelitian ini adalah sebagian orangtua di TK Negeri Pembina Blora sebanyak 70 responden. Hasil analisis uji spearmen’s rho pola asuh orangtua dengan tingkat kemandirian personal hygiene cuci tangan didapatkan hasil p value = 0,000 < α (0,05), dan pola asuh orangtua dengan kemandirian personal hygiene gosok gigi didapatkan hasil p value = 0,000 < α (0,05). Sehingga dapat disimpulkan bahwa ada hubungan yang signifikan antara pola asuh orang tua dengan tingkat kemandirian personal hygiene cuci tangan dan gosok gigi pada anak prasekolah di TK Negeri Pembina Blora Tahun 2019. Kata kunci: pola asuh; personal hygiene; prasekolah

scholarly journals Comparative Evaluation of Fracture Resistance of Endodontically Treated Teeth Restored with Resin Fiber Post and Stainless Steel Post: An In Vitro Study

2015 ◽  
Vol 03 (02) ◽  
pp. 080-084
Author(s):  
Vijay Singh ◽  
Poonam Bogra ◽  
Saurabh Gupta ◽  
Navneet Kukreja ◽  
Neha Gupta
Keyword(s):  
Stainless Steel ◽  
Fracture Resistance ◽  
Testing Machine ◽  
Compressive Force ◽  
Control Group ◽  
Fiber Post ◽  
Endodontically Treated Teeth ◽  
Group I ◽  
Significant Difference

AbstractFracture resistance of endodontically treated teeth restored with post. Aims: This study aims to compare the fracture resistance of endodontically treated teeth restored with resin fiber and stainless steel post. Commercially available prefabricated resin fiber post(Dentsply Maillefer Easy Post), prefabricated stainless steel post(Coltene/Whaledent Parapost) were used. Methods and Material: Forty five maxillary central incisors were obturated and divided into 3 groups: Control Group (Group I) without any post (n = 15), Resin Fiber Post Group (Group II) (n = 15) and Stainless Steel Post Group (Group III) (n = 15). In all Groups except control group, post space was prepared; a post was cemented, and a core build-up was provided. All the specimens were subjected to compressive force under a universal testing machine until fracture. Statistical analysis used: The results were analyzed using the variable analysis test (ANOVA). Results: One-way analysis of variance revealed significant difference among test groups. The control group demonstrated highest fracture resistance (925.2183 N), followed by the resin fiber post group (486.7265 N) and stainless steel post group (423.539N). Conclusions: Teeth restored with resin fiber post showed higher fracture resistance values than prefabricated stainless steel post.

scholarly journals Preparation and Characterization of a Sol–Gel AHEC Pore-Sealing Film Prepared on Micro Arc Oxidized AZ31 Magnesium Alloy

Metals ◽  
2021 ◽  
Vol 11 (5) ◽  
pp. 784
Author(s):  
Longlong Zhang ◽  
Yuanzhi Wu ◽  
Tian Zeng ◽  
Yu Wei ◽  
Guorui Zhang ◽  
...  
Keyword(s):  
Corrosion Resistance ◽  
Magnesium Alloy ◽  
Sol Gel ◽  
Oxide Coating ◽  
Az31 Magnesium Alloy ◽  
Hydroxyethyl Cellulose ◽  
Gel Spinning ◽  
Test Analysis ◽  
Pore Sealing ◽  
Micro Arc Oxidation

The purpose of this study was to improve the cellular compatibility and corrosion resistance of AZ31 magnesium alloy and to prepare a biodegradable medical material. An aminated hydroxyethyl cellulose (AHEC) coating was successfully prepared on the surface of a micro-arc oxide +AZ31 magnesium alloy by sol–gel spinning. The pores of the micro-arc oxide coating were sealed. A polarization potential test analysis showed that compared to the single micro-arc oxidation coating, the coating after sealing with AHEC significantly improved the corrosion resistance of the AZ31 magnesium alloy and reduced its degradation rate in simulated body fluid (SBF). The CCK-8 method and cell morphology experiments showed that the AHEC + MAO coating prepared on the AZ31 magnesium alloy had good cytocompatibility and bioactivity.

scholarly journals Estimation of Energy Requirement of Jatropha Curcas L. Seedcake Briquettes under Compression Loading

Energies ◽  
2018 ◽  
Vol 11 (8) ◽  
pp. 1980 ◽  
Author(s):  
Tatiana Ivanova ◽  
Abraham Kabutey ◽  
David Herák ◽  
Cimen Demirel
Keyword(s):  
Mechanical Behaviour ◽  
Jatropha Curcas ◽  
Energy Requirement ◽  
Testing Machine ◽  
P Value ◽  
Force Coefficient ◽  
Compression Loading ◽  
Jatropha Curcas L ◽  
Deformation Curves ◽  
Deformation Coefficient

The energy requirement of Jatropha curcas L. seedcake of different dimensions (4.5, 5.6, 6.7, 8 and 10 mm) for briquette compaction was investigated under compression loading (100, 200, 300 and 400 kN) using the universal compression-testing machine. The parameters measured and/or calculated were the deformation, thickness, numerical energy and theoretical energy. The statistical analysis results show that compression forces had a significant effect (P-value < 0.05) on the amounts of deformation and thickness, while that of the dimensions of the sample did not. The increase in compression forces increased the numerical energy while that of samples dimensions caused a decrease. Using the tangent curve mathematical model; the force coefficient of mechanical behaviour (kN), the deformation coefficient of mechanical behaviour and the fitting curve function exponent were determined for describing the experimental dependency between the force and deformation curves as well as the numerical energies of densified jatropha seedcake briquettes.

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