Study on the acceleration of single‐cone PDC composite bit

2021 ◽  
Author(s):  
Chunyan Kong ◽  
Chongyang Wang ◽  
Rongjun Zhu ◽  
Guojun Wang ◽  
Chunlin Liu ◽  
...  
Keyword(s):  
Single Cone

A Single Cone Multiple‐Row Plot Seeder 1

Crop Science ◽  
1972 ◽  
Vol 12 (6) ◽  
pp. 871-872 ◽  
Author(s):  
H. G. Marshall
Keyword(s):  
Single Cone

scholarly journals Comparison of bacterial microleakage of three bioactive endodontic sealers in simulated underwater diving and aviation conditions

2021 ◽  
Vol 21 (1) ◽  
Author(s):  
Mehdi Dastorani ◽  
Behnam Malekpour ◽  
Mohsen AminSobhani ◽  
Mohammadsadegh Alemrajabi ◽  
Arezoo Mahdian ◽  
...  
Keyword(s):  
Atmospheric Pressure ◽  
Mineral Trioxide Aggregate ◽  
In Vitro Study ◽  
Chi Square ◽  
Custom Made ◽  
Single Cone ◽  
Registration Number ◽  
Chi Square Test ◽  
Pressure Changes

Abstract Background Bacterial microleakage is an important cause of apical periodontitis and endodontic treatment failure. This study aimed to assess the bacterial microleakage of nano-mineral trioxide aggregate (nano-MTA) as a sealer, Endoseal MTA, and GuttaFlow Bioseal sealers in atmospheric pressure, and simulated underwater diving and aviation conditions. Methods In this in vitro, experimental study, 180 extracted single-rooted teeth were cleaned and shaped, and were then randomly divided into three groups for single-cone obturation using Endoseal MTA, GuttaFlow Bioseal, or nano-MTA as a sealer. Each group was then randomly divided into three subgroups, and subjected to ambient atmospheric pressure, 2 atm pressure (to simulate underwater diving), and 0.5 atm pressure (to simulate aviation) using a custom-made pressure chamber. The teeth then underwent microbial leakage test using Streptococcus mutans (S. mutans), and the percentage of samples showing microleakage was recorded for up to 1 month, and analyzed using the Chi-square test. Results The three sealer groups were significantly different regarding bacterial microleakage (P < 0.05). The nano-MTA group showed significantly higher microleakage after 15 days than the other two groups (P = 0.006). The effect of pressure on bacterial microleakage was not significant in any sealer group (P > 0.05). Conclusion Within the limitations of this in vitro study, it may be concluded that single-cone obturation technique using nano-MTA as a sealer results in lower resistance to bacterial microleakage compared with the use of GuttaFlow Bioseal, and Endoseal MTA. Pressure changes in simulated underwater diving and aviation conditions had no significant effect on bacterial microleakage. Trial Registration Number This is not a human subject research.

scholarly journals Evaluación in vitro de la microfiltración de Enterococcus faecalis usando cinco técnicas de obturación / In Vitro Evaluation of Enterococcus faecalis Microleakage Using Five Obturation Techniques

2016 ◽  
Vol 35 (74) ◽  
Author(s):  
Silvia Elena Aragón Matamoros ◽  
Tomás Alberto Guindos Moya ◽  
Yanina Meza González ◽  
Diana Morales Herrera ◽  
María Alejandra Perera Díaz ◽  
...  
Keyword(s):  
Enterococcus Faecalis ◽  
Color Change ◽  
Three Dimensional ◽  
Brain Heart Infusion ◽  
Phenol Red ◽  
Root Canal Filling ◽  
Gutta Percha ◽  
Single Cone ◽  
Primary Lateral

<p><strong>ABSTRACT. </strong><em><strong>Background:</strong></em> The root canal filling technique named Hybrid-Mixed Condensation, combines the advantages of cold lateral and warm vertical condensation. The ability of avoiding microbial microleakage has not been proven. <em><strong>Purpose:</strong></em> To evaluate the differences of microbial microleakage using <em>Enterococcus faecalis</em>, in canals obturated with five different techniques: lateral, warm vertical, WaveOne® single cone, Guttacore®, and Hybrid-mixed condensation. <em><strong>Methods:</strong></em> 50 single-rooted human premolars extracted for orthodontic reasons were biomechanical prepared with primary file of WaveOne® system. Teeth were divided into 5 groups using different obturation techniques: single cone with WaveOne® Primary, lateral condensation using 2 % gutta-percha cones, Guttacore® 30, warm vertical condensation using down packing in a WaveOne® Primary cone and backfill with alpha gutapercha of Beefill®, and the hybrid mixed condensation modifying the lateral condensation with heat and a backfill using Beefill®. <em>Enterococcus faecalis</em> was inoculated in the coronal third and apices were immersed in brain heart infusion broth with phenol red incubated at 37 °C for 12 weeks. Microfiltration was determined with color change and turbidity of the medium. Specimens were observed by scanning electron microscopy. <em><strong>Results:</strong></em> Only 11 teeth (22 %) were positive for leakage. 46 % with single cone, 30 % with Guttacore®, 20 % with lateral condensation, 10 % with warm vertical condensation and no microleakage was found for Hybrid-Mixed Technique over the period of 12 weeks of study. <em><strong>Conclusion:</strong></em> Hybrid Mixed Technique showed to be the most efficient technique to get three-dimensional seal and prevent microbial contamination of canals in the endodontic therapy.</p>

scholarly journals Perawatan Saluran Akar Multi Kunjungan Protaper Rotary Files Single Cone pada Nekrosis Pulpa Disertai Asses Dentoalveolar Akut (terhadap Gigi Molar Pertama Kiri Mandibula)

2011 ◽  
Vol 18 (1) ◽  
pp. 44
Author(s):  
Billy Sujatmiko ◽  
Endang Retnowati Retnowati
Keyword(s):  
Single Cone ◽  
Crown Lengthening

Latar belakang. Perawatan saluran akar multi kunjungan merupakan perawatan endodonlik yang diperuntukan untuk kasus-kasus yang memerlukan proses penyembuhan antar kunjungan dan di peruntukan untuk lesi-Iesi akut dan merupakan kotra indikasi perawatan saluran akar satu kunjungan. Tujuan. Kasus ini adalah untuk untuk menginformasikan hasil evaluasi perawatan saluran akar multi kunjungan pada gigi molar pertama kiri mandibula yang nekrosis pulpa dengan abses dentoalveolar akut. Kasus. Pasien perempuan berusia 20 tahun datang ke klinik Konservasi Gigi RSGM FKG UGM ingin merawat gigi bawah kiri yang mengalami rasa sa kit aku!. Berdasarkan pemeriksaan subyektif, obyektif dan radiografis diperoleh diagnosis gigi molar pertama kiri mandibula nekrosis pulpa dengan abses dentoalviolar akut. Penanganan. Perawatan yang dilakukan perawatan saluran akar multi kunjungan protaper rotary files, kunjungan sebanyak 3 kali kunjungan dan diobturasi dengan metode single cone dan kemudian dilanjutkan dengan perawatan crown lengthening pemasangan pasak radix anchor, pembuatan inti dan pembuatan jaket full crown fused to metal. Hasil. Evaluasi klinis pad a waktu kontrol gigi menunjukkan perkusi, palpasi sudah tidak terasa sakit pemeriksaan radiografi menunjukkan sudah tidak ada kelainan gambaran radiolusen.

scholarly journals Is the ultraviolet waveband a special communication channel in avian mate choice?

2001 ◽  
Vol 204 (14) ◽  
pp. 2499-2507 ◽  
Author(s):  
Sarah Hunt ◽  
Innes C. Cuthill ◽  
Andrew T. D. Bennett ◽  
Stuart C. Church ◽  
Julian C. Partridge
Keyword(s):  
Mate Choice ◽  
Communication Channel ◽  
Visible Spectrum ◽  
Short Wave ◽  
Zebra Finches ◽  
Long Wave ◽  
Single Cone ◽  
Coloured Filters ◽  
Uv Reflection

SUMMARYThere is growing evidence that ultraviolet (UV) wavelengths play an important role in avian mate choice. One of the first experiments to support this idea showed that female zebra finches (Taeniopygia guttata) prefer UV-reflecting males to males whose ultraviolet reflection has been removed. The effect was very strong despite little or no UV reflection from several plumage areas. However, it is not clear how the importance of the UV waveband compares to other regions of the bird-visible spectrum. We tested whether the response of female zebra finches to the removal of male UV reflection is greater than to the removal of other wavebands. We presented females with a choice of males whose appearance was manipulated using coloured filters. The filters removed single blocks of the avian visible spectrum corresponding closely to the spectral sensitivities of each of the zebra finch’s single cone classes. This resulted in males that effectively had no UV (UV−), no short-wave (SW−), no medium-wave (MW−) or no long-wave (LW−) plumage reflection. Females preferred UV− and SW− males. LW− and MW− males were least preferred, suggesting that female zebra finches show the greatest response to the removal of longer wavelengths. Quantal catches of the single cone types viewing body areas of the male zebra finch are presented for each treatment. Our study suggests it is important to consider the role of the UV waveband in avian mate choice in conjunction with the rest of the avian visible spectrum.

scholarly journals Towards the single cone transducer function

2013 ◽  
Vol 13 (15) ◽  
pp. T17-T17
Author(s):  
S. Klein ◽  
T. Carney ◽  
G. Switkes ◽  
M. Choi ◽  
A. Roorda ◽  
...  
Keyword(s):  
Single Cone

scholarly journals Resolving single cone inputs to visual receptive fields

2009 ◽  
Vol 12 (8) ◽  
pp. 967-969 ◽  
Author(s):  
Lawrence C Sincich ◽  
Yuhua Zhang ◽  
Pavan Tiruveedhula ◽  
Jonathan C Horton ◽  
Austin Roorda
Keyword(s):  
Receptive Fields ◽  
Visual Receptive Fields ◽  
Single Cone
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