Hasil Pencarian  ::  Simpan CSV :: Kembali

"ABSTRACTFor a given sealant, successful pit and fissure sealing is principally governed by the enamel conditioning technique and the presence of moisture contamination. A new generation of hydrophilic resin sealants is reported to tolerate moisture. This study investigates the impact of Er YAG laser preconditioning and moisture contamination on the microleakage of a recent hydrophilic sealant. Occlusal surfaces of extracted human molars were either acid etched (n = 30), or successively lased and acid etched (n = 30). Ten teeth from each group were either air dried, water contaminated, or saliva-contaminated prior to sealing with UltraSeal XT hydro. Samples were inspected for penetration of fuchsin dye following 3000 thermocycles between 5 and 50 C, and the enamel sealant interfaces were observed by scanning electron microscopy (SEM). Significant differences in microleakage were evaluated using the Mann Whitney U test with Bonferroni adjustment (p = 0.05). Laser pre-conditioning significantly reduced dye penetration irrespective of whether the enamel surface was moist or dry. Microleakage of watercontaminated acid etched teeth was significantly greater than that of their air-dried or salivacontaminated counterparts. SEM analysis demonstrated good adaptation in all groups with the exception of water-contaminated acid etched teeth which exhibited relatively wide gaps. In conclusion, this hydrophilic sealant tolerates the presence of saliva, although water was found to impair its sealing ability. Laser pre-conditioning significantly decreases microleakage in all cases."

"[Latar Belakang: Kebocoran mikro tepi restorasi resin komposit dapat menyebabkan terjadinya perubahan warna dan karies sekunder. Salah satu upaya menguranginya adalah teknik rebonding pasca finishing dan polishing. Tujuan: Menganalisiskebocoranmikrotepirestorasi resin kompositsetelahdilakukanteknikrebondingmenggunakansurface sealant danbonding agent. Metode: 60 gigi premolar dipreparasi pada bagian bukal dengan diameter kavitas 3mm dan kedalaman 2mm. Sampel penelitian dibagi menjadi dua kelompok secaraacakuntukdilakukanrebonding.Kelompok 1 dilakukanrebondingmenggunakansurface sealant dan kelompok 2 menggunakanbonding agent. Pengukuran penetrasi zat warna biru metilen 1% dilakukan setelah thermocycling. Hasil: Terdapat perbedaan yang bermakna (p<0,05) antara jenis bahan rebonding dengan skala kebocoran, dimana kebocoran mikro tepi restorasi paling sedikit terdapat pada kelompok 1 dibandingkan kelompok 2. Kesimpulan: Prosedur rebonding dengan aplikasi surface sealant dapat menutup kebocoran mikro pada tepi restorasi resin komposit pasca finishing dan polishing lebih baik dibandingkan aplikasi bonding agent., Background:Microleakage at the marginal area of composite resin restoration can lead to discoloration and secondary caries. Performing rebonding after finishing and polishing can reduce microleakage of composite resin restoration. Aim: The aim of this study was to analyse the microleakageof composite resin restoration after rebonding with surface sealant and bonding agent. Methods: Cavity preparation was performed on the buccal side of sixty human premolar teeth with 3mm diameter and 2mm depth. Samples were randomly divided into two groups for rebonding with different materials. Samples in group 1 were rebonded with surface sealant, while samples in group 2 using bonding agent. The microleakage was measured using 1% methylene blue after thermocycling procedure. Results: Group 1shows less microleakage than group 2, statistic analysis show significant difference between the two groups ( p<0.05). Conclusion: Rebonding procedure with surface sealant can reduce marginal microleakage in composite resin restoration better than bonding agent.]"

"ABSTRAKLatar Belakang: Gel APF yang bersifat asam dapat meningkatkan kekasaranpermukaan bahan restorasi, yang menyebabkan adhesi bakteri dan karies sekunder.Tujuan: Menganalisis pengaruh aplikasi gel APF terhadap kekasaran permukaanresin sealant. Metode: Tiga puluh enam spesimen resin sealant dibagi secara acakke dalam enam kelompok, yaitu aplikasi gel APF dan akuades selama tiga puluhmenit sebanyak satu, dua dan tiga kali. Nilai kekasaran permukaan rerata diukurdengan surface roughness tester Mitutoyo SJ201. Hasil: Kekasaran permukaanmeningkat bermakna setelah satu kali aplikasi, dan menurun bermakna setelah duakali aplikasi. (p<0,05)Kesimpulan: Gel APF menurunkan kekasaran permukaanresin sealant setelah dua kali aplikasi.

---

ABSTRACTBackground: Acidity of APF gel could increase restorative material surfaceroughness, leading to increased bacterial adhesion and secondary caries. Aim: Toanalyze the effect of APF gel application on the surface roughness of resin sealant.Method: Thirty six resin sealant specimens were randomly divided into six groups,APF gel and aquadest one, two and three times application for thirty minutes each.Mean roughness was measured by Mitutoyo SJ201 surface roughness tester. Result:Surface roughness was significantly increased after one time gel application, anddecreased significantly after twice gel application. (p<0,05)Conclusion: APF geldecreased resin sealant surface roughness after second application."

"Efek sistem poles satu tahap dan multi-tahap pada kekasaran email setelah pelepasan bracket orthodonti. Setelah perawatan orthodonti selesai, tahap pekerjaan yang harus dilakukan adalah melepaskan bracket dan membersihkan sisa-sisa bahan perekat. Metode yang sering digunakan adalah dengan membersihkan sisa perekat menggunakan sistem poles bertingkat, yang dikenal sebagai multi-step polishing system. Kekurangan sistem ini adalah lamanya waktu kerja, karena banyaknya tahap pekerjaan. Saat ini produsen material kedokteran gigi telah memperbaiki sistem ini, dengan membuat suatu sistem poles satu tahap. Sistem baru ini disebut sebagai one-steppolishing system. Tujuan: Membandingkan tingkat kekasaran email setelah dilakukan debonding bracket orthodonti menggunakan one-step dan multi-step polishing system. Metode: Pemilihan dan penentuan kelompok sistem poles yang digunakan pada dua puluh delapan gigi premolar rahang atas dilakukan secara acak. Penelitian inimenggunakan one-step OpraPol (Ivoclar, Vivadent) dan multi-step AstroPol (Ivoclar, Vivadent). Setelah dilakukan debonding bracket, sisa bahan perekat dari setiap kelompok dibersihkan selama 90 detik menggunakan sistem yang telah dipilih menggunakan handpiece putaran lambat. Kekasaran email kemudian diukur menggunakanprofilometer, dengan dua parameter (Ra, Rz). Uji t digunakan untuk menganalisis perbedaan rerata kekasaran email dari kedua kelompok. Hasil: Tidak terdapat perbedaan bermakna pada rerata kekasaran email antara kedua sistem poles (p>0,005). Simpulan: Debonding bracket dan pembersihan sisa-sisa perekat menggunakan one-step polishing system memberikan kekerasan email yang serupa dengan multi-step polishing system.

---

The final procedures of orthodontic treatment are bracket debonding and cleaning the remaining adhesive. Multistep polishing system is the most common method used. The disadvantage of that system is long working time, because of the stages that should be done. Therefore, dental material manufacturer make an improvement to the system, to reduce several stages into one stage only. This new system is known as one-step polishing system. Objective: To compare the effect of one-step and multi-step polishing system on enamel roughness after orthodontic bracket debonding. Methods: Randomized control trial was conducted included twenty-eight maxillary premolar randomized into two polishing system; one-step OptraPol (Ivoclar, Vivadent) and multi-step AstroPol (Ivoclar, Vivadent). After bracket debonding, the remaining adhesive on each group was cleaned by subjective polishingsystem for ninety seconds using low speed handpiece. The enamel roughness was subjected to profilometer, registering two roughness parameters (Ra, Rz). Independent t-test was used to analyze the mean score of enamel roughness in each group. Results: There was no significant difference of enamel roughness between one-step and multi-step polishing system (p>0.005). Conclusion: One-step polishing system can produce a similar enamel roughness to multi-step polishing system after bracket debonding and adhesive cleaning."

"Skripsi ini membahas mengenai pengaruh aplikasi pasta CPP-ACP terhadap kekasaran permukaan semen ionomer kaca (SIK) pit dan fissure sealant (PFS) setelah perendaman dalam Coca Cola® dengan melakukan perendaman spesimen SIK PFS dalam akuabides (kontrol), perendaman Coca Cola®, pengaplikasian pasta CPP-ACP yang dilanjutkan dengan perendaman dalam Coca Cola® serta pengaplikasian pasta CPP-ACP yang didiamkan selama 30 menit lalu dilanjutkan dengan perendaman dalam Coca Cola®. Hasil penelitian menunjukkan peningkatan kekasaran permukaan yang signifikan pada spesimen yang direndam dalam Coca Cola®, penurunan kekasaran permukaan yang tidak signifikan pada spesimen yang diaplikasikan pasta CPP-ACP lalu direndam dalam Coca Cola®, serta penurunan kekasaran permukaan yang signifikan pada spesimen yang diaplikasikan pasta CPP-ACP dan didiamkan selama 30 menit kemudian direndam dalam Coca Cola®. Pengaplikasian pasta CPP-ACP yang didiamkan selama 30 menit menunjukkan perbedaan penurunan kekasaran permukaan yang signifikan dengan yang langsung direndam dalam Coca Cola®.

---

This thesis aims to analyze the effect CPP-ACP paste to surface roughness of pit and fissure sealant (PFS) Glass Ionomer Cement (GIC) after placed in Coca Cola® drink. Speciments placed in aquabidest, placed in Coca Cola®, application of CPP-ACP paste then immediately placed in Coca Cola®, and application of CPP-ACP, waited for 30 minutes then placed in Coca Cola®. Surface roughness increased significantly after placed in Coca Cola®. No significant differences were found after application of CPP-ACP placed in Coca Cola® immediately. Surface roughness decreased significantly after application of CPP-ACP waited for 30 minutes then placed in Coca Cola®. The application of CPP-ACP pasteafter waited for 30 minutes then placed in Coca Cola® shows significant differences of PFS GIC’s surface roughness with speciments applicated by CPP-ACP paste and immediately placed in Coca Cola®."

"Magnesium (Mg) merupakan logam ringan dan dapat diserap tubuh melalui proses degradasi atau bersifat biodegradable. Namun Magnesium dan paduannya mengalami degradasi yang sangat cepat di dalam lingkungan fisiologis akibatnya kekuatan mekanik dari implan akan menurun. Untuk meningkatkan ketahanan korosi dari paduan magnesium dapat dilakukan dengan metode anodizing. Lapisan oksida yang dihasilkan dari proses anodizing memiliki banyak retakan dan pori pada permukaannya. Retakan dan pori ini dapat ditutup melalui metode sealing beeswax-colophony. Proses anodizing dilakukan pada tegangan konstan 5 volt dalam elektrolit 0.5 M Na3PO4 pada suhu 30°C ± 1°C dengan variasi waktu 10, 20, dan 30 menit. Pada waktu 10, 20, dan 30 menit terukur tebal lapisan 6, 14, dan 16 μm. Optimasi waktu anodizing dihasilkan pada anodizing 20 menit. Untuk mengetahui laju korosi paduan magnesium yang telah di anodizing dan sealing dilakukan dengan uji hilang berat (invitro) selama 14 hari dalam larutan 0,9% NaCl pada suhu 37°C. Hasil uji hilang berat divalidasi dengan uji potentiodynamic polarization. Hasil uji hilang berat yang menunjukkan laju korosi dari substrat; anodizing; substrat + beeswax-colophony sealing; anodizing + hidrotermal sealing; anodizing + beeswax-colophony sealing berturut-turut yaitu 7,91; 6,26; 5,0; 6,06; dan 3,30 mmpy. Hasil uji polarisasi menunjukkan peningkatan ketahanan korosi yang diperlihatkan oleh kenaikan potensial korosi untuk substrat; anodizing; substrat + beeswax-colophony sealing; anodizing + hidrotermal sealing; anodizing + beeswax-colophony sealing berturut-turut adalah -1.49, -1.57, -1.54, -1.43, dan -1,17 VAg/AgCl dan penurunan arus korosi berturut-turut 5.72x10-4, 3.40x10-5, 2.54x10-8, 2.19x10-5 , dan 3.19x10-8 A/cm2. Hasil tersebut menunjukkan bahwa perlakuan anodizing dan sealing dengan beeswax-colophony terbukti dapat meningkatkan ketahanan korosi paduan AZ31 2 kali lipat.

---

Magnesium (Mg) is the light metals and absobable materials by the human body through a process of degragradation known as biodegradable. However, Mg and its alloys has a rapid corrosion rate in physiological environtment causes reduction of mechanical properties of implants. Anodizing is widely used to increase corrosion resistance of magnesium alloys. The oxide layer produced while anodizing process has many cracks and porous on its surface. Cracks and porous could covered by beeswax-colophony sealing method. The anodization process was carried out at constant voltage 5 volt in electrolyte of 0.5 M Na3PO4 at 30 ° C ± 1 ° C with variations of time 10, 20, and 30 minutes. The thickness of layer was measured at 10, 20, and 30 minutes are 6, 14, 16 μm respectively. Anodizing time optimization was obtained at 20 minutes. to determine the corrosion rate of anodized and sealed magnesium alloy was carried out by in-vitro test for 14 days on 0.9% NaCl solution at 37 ° C. The results of the weight loss test were validated by potentiodynamic polarization test. The weight loss test results exhibits the rate of corrosion of the substrate, anodizing; substrate + beeswax-colophony sealing; anodizing + hydrothermal sealing; anodizing + beeswax-colophony sealing are 7.91, 6.26, 5.0, 6.06, and 3.30 mmpy respectively. The results of corrosion on AZ31 show by increased corrosion potential, -1.49, -1.57, -1.54, -1.43, and -1.17 VAg/AgCl and decreased corrosion currents, 5.72x10-4, 3.40x10-5, 2.54x10-8, 2.19x10-5, and 3.19x10-8 A/cm2 on the substrate; anodizing; substrate + beeswax-colophony sealing; anodizing + hydrothermal sealing; anodizing + beeswax-colophony sealing. These results prove anodizing and coatings increase corrosion resistance of AZ31 twice.

"

"Lignocellulosic biomass (LCB) merupakan salah satu sumber daya yang paling banyak tersedia di alam yang kerap digunakan dalam penelitian pembakaran membara. Contoh biomasa lignoselulosa antara lain adalah tanah gambut, kertas, sabut kelapa, tembakau, jerami, dan batu bara. Sebelumnya, telah dilakukan beberapa penelitian terkait pembakaran membara pada tanah gambut di Laboratorium Thermodinamika, Fakultas Teknik, Universitas Indonesia. Oleh sebab itu, perlu adanya penelitian pembakaran membara pada biomasa lignoselulosa lainnya, seperti kertas. Penyalaan dan pembakaran bahan kertas dipengaruhi oleh moisture content (MC) sehingga perlu adanya pengeringan pada temperatur dan dalam waktu tertentu. Eksperimen dilakukan menggunakan lima sampel dengan tingkat MC yang berbeda (9.9%, 7.2%, 5.7%, 4.4%, dan 4.3%). Hasil percobaan menunjukkan bahwa hahan kertas sukar untuk membara dan mempertahankan pembakarannya pada MC >10% (tanpa pengeringan), bahan kertas dapat membara dan mempertahankan pembakarannya hingga ±10 menit setelah igniter dimatikan pada MC 7 – 10%, dan bahan kertas dapat membara dan mempertahankan pembakarannya hingga ±80 menit setelah igniter dimatikan pada MC ≤5.7%. Kemudian dapat diketahui hubungan antara moisture content dengan karakteristik penyebaran pembakaran membara bahan kertas dan besaran emisi yang dihasilkan. Hasil percobaan menunjukkan bahwa sampel dengan MC 4% (~4.4 cm²/min dan 500 cm²) menghasilkan laju perambatan dan luas area bakar yang lebih besar dibandingkan dengan sampel dengan MC 5.7% (2.86 cm²/min dan 387.72 cm²). Konsentrasi CO dan rata – rata partikulat yang dihasilkan pada eksperimen dengan MC 4% adalah ~550 ppm(vol) dan 380.82 μg/m³ serta MC 5.7% adalah ~500 ppm(vol) dan 347.48 μg/m³.

---

Lignocellulosic biomass (LCB) is one of the most abundant resources available in nature and is often used in smoldering combustion research. The examples of lignocellulosic biomass are peat, paper, coconut fiber, tobacco, straw, and coal. Previously, several studies had been carried out regarding smoldering of peat soil at the Thermodynamics Laboratory, Faculty of Engineering, University of Indonesia. Therefore, there is a need for research on smoldering combustion on other lignocellulosic biomass, such as paper. Ignition and burning of paper are influenced by moisture content (MC), thus drying at a certain temperatue within certain minutes is necessary. Experiments were carried out using five samples with different MC levels (9.9%, 7.2%, 5.7%, 4.4%, and 4.3%). The experimental results show that paper material is difficult to smolder and maintain its combustion at MC > 10% (without drying). paper material can smolder and maintain its combustion up to ± 10 minutes after the igniter is turned off at MC 7 – 10%, and paper material can smolder and maintain its combustion up to ±80 minutes after the igniter is turned off at MC ≤5.7%. Therefore, we can find out the relationship between moisture content and the characteristics of the smoldering of paper and the amount of emissions produced. The experimental results show that the sample with MC 4% (~4.4 cm²/min and 500 cm²) produces a greater propagation rate and burn area compared to the sample with MC 5.7% (2.86 cm²/min and 387.72 cm²). The average concentration of CO and particulates produced in the experiment with MC 4% was ~550 ppm(vol) and 380.82 μg/m³ and MC 5.7% was ~500 ppm(vol) and 347.48 μg/m³."

"Tujuan dari penelitian ini adalah untuk membandingkan tingkat perbaikan absolut pada lesi dini email secara in vivo akibat penggunaan pasta gigi yang mengandung nano CaCO3 dengan pasta gigi non-nano CaCO3 yang diperiksa menggunakan DIAGNOdent Pen. Dalam penelitian ini, empat puluh subjek yang sehat, berpuasa pada hari pemeriksaan, dan hasil pembacaan DIAGNOdent Pen menunjukkan angka 14-29 (demineralisasi lapisan email) dibagi secara acak menjadi dua kelompok. Kelompok non-nano CaCO3 dan kelompok nano CaCO3 masing-masing kelompok berisi dua puluh subjek. Seluruh subjek diminta untuk menyikat gigi menggunakan pasta gigi sesuai dengan kelompok penelitiannya. Periode pengujian berlangsung selama empat belas hari. Tingkat perbaikan absolut pada lesi dini email dievaluasi menggunakan DIAGNOdent Pen pada saat sebelum dan sesudah 14 hari perlakuan. Hasil dari kelompok kontrol dibandingkan dengan kelompok perlakuan dengan menggunakan uji statistik, Mann-Whitney. Tingkat perbaikan absolut pada pasta gigi nano CaCO3 berbeda bermakna dengan pasta non-nano CaCO3. Dapat disimpulkan bahwa, pasta gigi yang mengandung nano CaCO3 memiliki potensi yang lebih besar dalam memperbaiki lesi dini karies email dibandingkan pasta gigi non-nano CaCO3.

---

The aim of this study was to compare the degree of absolute repair of teeth in an early email lesion in vivo between the use of toothpaste containing nano CaCO3 and toothpaste containing non-nano CaCO3 as measured by DIAGNOdent Pen. In this study, fourty subjects with good general state of health, fasting at the examination day, and showed the reading of DIAGNOdent Pen at 14-29 (demineralization of the enamel layer) were divided into two groups by randomization. Non-nano CaCO3 toothpaste group consisted of twenty subjects and Nano CaCO3 toothpaste consists of twenty subjects.

All subjects are instructed to brush their teeth using the assigned toothpaste. Testing period lasted for fourteen days. The degree of repair were evaluated using DIAGNOdent Pen before, and after fourteen days of use.

The result obtained between two groups were compared statistically using Mann-Whitney U test. Degree of absolute repair in test group was statistically different with control group. It can be concluded that, toothpaste containing nano CaCO3 have greater potential in repairing early carious lesion compared to toothpaste containing non-nano CaCO3."

"Efek susu, kombinasinya dengan teh, dan NaF 0,2% terhadap demineralisasi email gigi: analisis microcomputed tomography. Fluor dan kalsium berperan penting dalam pencegahan karies gigi, karena dapat menghambat demineralisasi dan meningkatkan remineralisasi Tujuan: Menganalisis efek dari susu sendiri dan kombinasi dengan teh, dan NaF 0,2% pada demineralisasi email gigi menggunakan micro-computed tomography (micro-CT). Metode: Pada bagian koronal 40 gigi premolar manusia yang telah diekstraksi, dibuatkan region ofinterest. Permukaan oklusal tiap gigi tersebut ditutupi stiker 3x5 mm2 dan semua permukaan lainnya ditutupi dengan pernis tahan asam. Gigi-gigi yang telah dipersiapkan ini secara acak dan dialokasikan ke dalam empat kelompok yang direndam dalam larutan remineralisasi selama 26 menit, yakni: Grup A, susu; Grup B, susu dan teh; Grup C, susu dan NaF 0,2%; dan Grup D, deionized air (kontrol). Hasil: Setelah 3 hari perendaman dalam larutan buffer pada pH 4,4, dilakukan pemindaian dengan micro-CT. Nilai rata-rata grayscale dan standar deviasi secara berurutan: 98,1 ± 24,0; 90,8 ± 9,1; 92,6 ± 21,4; 81,1 ± 20,3. Nilai rata-rata grayscale yang berbeda bermakna secara signifikan antara empat kelompok tersebut (p<0,05), kecuali antara kelompok A dan B dan antara kelompok A dan C. Simpulan: Topikal aplikasi dengan susu saja menunjukkan efek perlindungan yang lebih tinggi terhadap demineralisasi dibandingkan dengan aplikasi sinergis susu dengan teh dan, susu dengan, 0,2% NaF.

---

Fluoride and calcium play an important role in the prevention of dental caries, promoting the inhibition of demineralization and the increase of remineralization. Objective: To investigate the effects of milk with/without the combination of tea and 0.2% NaF on enamel demineralization using micro-computed tomography (microCT). Methods: The coronal parts of 40 extracted sound premolars were prepared as tooth blocks. An unvarnished occlusal surface window was created for each tooth by covering the occlusal surface with a 3x5 mm2 sticker and painting all other surfaces with an acid-resistant varnish. These blocks were randomly allocated into four groups that were immersed in remineralizing solutions for 26 minutes: Group A, milk; Group B, milk and tea; Group C, milk and 0.2% NaF; and Group D, deionized water (control). Results: After 3 days of immersion in a buffered demineralization solution at pH 4.4, micro-CT scans were taken. The mean grayscale values and the standard deviations are: 98.1 ± 24.0; 90.8 ± 9.1; 92.6 ± 21.4; 81.1 ± 20.3, respectively. The mean grayscale values were significantly different among the four groups (p<0.05), except between groups A and B and between groups A and C. Conclusion: Topical application with milk alone showed a higher protective effect against demineralization compared to the synergic application of milk and tea and milk and 0.2% NaF."

"Based on scarce evidence, fatty acids have been described as anticariogenic. The aim was to evaluate the effect of different types of fatty acids on enamel demin- eralization and on the cariogenic properties of Strepto- coccus mutans biofilms on a biofilm/caries model. Mature biofilms of S. mutans UA159 growing on bovine enamel slabs were exposed to 10 % sucrose for 5 min, 3 times per day followed by exposure to a panel of free fatty acids, including monounsaturated (oleic), polyunsaturated (lino- leic) and saturated (stearic) fatty acids, in concentrations of 0.1, 1 and 10 mM for five additional minutes. Enamel demineralization was determined before and after the experiments by microhardness. Slabs were retrieved to analyze biofilm biomass, viable bacterial counts and polysaccharide production. Biofilms exposed to sucrose, followed by oleic and linoleic acids, showed less demin- eralization than sucrose alone (p \ 0.05). Biomass, S. mutans colonies and insoluble extracellular polysaccharide production were reduced from the biofilms treated with oleic and linoleic fatty acids (p \ 0.05). No differences with the positive control were observed with the saturated stearic acid. Poly and monounsaturated fatty acids presented to S. mutans biofilms after a cariogenic challenge appear to reduce demineralization on enamel and to interfere with cariogenicity of S. mutans biofilms"