THE EFFECT OF FABRICATION TECHNIQUE AND CEMENT TYPE ON THE RETENTION STRENGTH OF IMPLANT SUPPORTED CROWNS

2021 ◽  
Vol 2 (4) ◽  
pp. 1-1
Author(s):  
Ali Mutlu ◽  
Mustafa Zortuk ◽  
Caner Öztürk ◽  
Fulya Bülte
Keyword(s):  
Fabrication Technique ◽  
Cement Type ◽  
Retention Strength

scholarly journals Influence of Hydrofluoric and Nitric Acid Pre-Treatment and Type of Adhesive Cement on Retention of Zirconia Crowns

Materials ◽  
2021 ◽  
Vol 14 (4) ◽  
pp. 960
Author(s):  
Osama Harb ◽  
Walid Al-Zordk ◽  
Mutlu Özcan ◽  
Amal Abdelsamad Sakrana
Keyword(s):  
Nitric Acid ◽  
Mean Value ◽  
Cement Type ◽  
Main Mode ◽  
Mode Of Failure ◽  
Zirconia Crowns ◽  
Pre Treatment ◽  
The Impact ◽  
Adhesive Cement ◽  
Retention Strength

Background: The aim of this study was to test the impact of hot acids etching and two types of adhesive cement on the retention of zirconia crowns. Methods: Forty maxillary premolars were prepared, and zirconia crowns were designed and fabricated with proximal extensions, then divided into 4 groups (n = 10). Group AP; the crowns were air-abraded and cemented using Panavia SA Cement. Group AL; the crowns were air- abraded and cemented using GC LinkForce. Group AHP; the crowns were air-abraded, etched with the hot acids (48% hydrofluoric acid and 69% nitric acid), and cemented using Panavia SA Cement. Group AHL; the crowns were air-abraded, etched with the hot acids, and cemented using GC LinkForce. Each zirconia crown was pre-treated and bonded to its corresponding tooth. After thermocycling (5–55 °C/10,000), the retention test was performed and the load required to dislodge the crown was reported in Newton (N), and mode of failure was recorded. The retention strength (MPa) was calculated for each tested variable and statistically analyzed. Results: Group AHP showed the highest mean value of the retention strength, followed by group AP then group AHL. Group AL showed the lowest value. A statistically significant effect (p = 0.001) of the hot acids etching on the retention of zirconia crown was found. Also, there was a significant effect (p = 0.000) of the cement type. The interaction between surface treatment and the cement type has no significant impact (p = 0.882). The main mode of failure for Panavia SA Cement is mixed mode of failure, while for G-CEM LinkForce is adhesive failure. Conclusions: Hot acid etching pre-treatment improved the retention of zirconia crown. Usage of Panavia SA Cement with hot acids etching is effective can be used for adhesive cementation of zirconia crown.

UHV-STM studies of silicon nano-pyramid growth on silicon surface at high temperature

1992 ◽  
Vol 50 (2) ◽  
pp. 1144-1145
Author(s):  
T. Sato ◽  
S. Kitamura ◽  
T. Sueyoshl ◽  
M. Iwatukl ◽  
C. Nielsen
Keyword(s):  
High Temperature ◽  
Relaxation Process ◽  
Thermal Effect ◽  
Bias Voltage ◽  
Silicon Surface ◽  
Growth Process ◽  
Tunneling Current ◽  
Fabrication Technique ◽  
Nano Fabrication ◽  
Electromigration Effect

Recently, the growth process and relaxation process of crystalline structures were studied by observing a SI nano-pyramid which was built on a Si surface with a UHV-STM. A UHV-STM (JEOL JSTM-4000×V) was used for studying a heated specimen, and the specimen was kept at high temperature during observation. In this study, the nano-fabrication technique utilizing the electromigration effect between the STM tip and the specimen was applied. We observed Si atoms migrated towords the tip on a high temperature Si surface.Clean surfaces of Si(lll)7×7 and Si(001)2×l were prepared In the UHV-STM at a temperature of approximately 600 °C. A Si nano-pyramid was built on the Si surface at a tunneling current of l0nA and a specimen bias voltage of approximately 0V in both polarities. During the formation of the pyramid, Images could not be observed because the tip was stopped on the sample. After the formation was completed, the pyramid Image was observed with the same tip. After Imaging was started again, the relaxation process of the pyramid started due to thermal effect.

scholarly journals One-Shot Fabrication of Polymeric Hollow Microneedles by Standard Photolithography

Polymers ◽  
2021 ◽  
Vol 13 (4) ◽  
pp. 520 ◽  
Author(s):  
Principia Dardano ◽  
Selene De Martino ◽  
Mario Battisti ◽  
Bruno Miranda ◽  
Ilaria Rea ◽  
...  
Keyword(s):  
Light Propagation ◽  
World Market ◽  
Emerging Technology ◽  
Standard Formulation ◽  
Proof Of Concept ◽  
Fabrication Technique ◽  
The World ◽  
Small Doses ◽  
Approved Drugs ◽  
Hollow Microneedles

Microneedles (MNs) are an emerging technology in pharmaceutics and biomedicine, and are ready to be commercialized in the world market. However, solid microneedles only allow small doses and time-limited administration rates. Moreover, some well-known and already approved drugs need to be re-formulated when supplied by MNs. Instead, hollow microneedles (HMNs) allow for rapid, painless self-administrable microinjection of drugs in their standard formulation. Furthermore, body fluids can be easily extracted for analysis by a reverse use of HMNs, thus making them perfect for sensing issues and theranostics applications. The fabrication of HMNs usually requires several many-step processes, increasing the costs and consequently decreasing the commercial interest. Photolithography is a well-known fabrication technique in microelectronics and microfluidics that fabricates MNs. In this paper, authors show a proof of concept of a patented, easy and one-shot fabrication of two kinds of HMNs: (1) Symmetric HMNs with a “volcano” shape, made by using a photolithographic mask with an array of transparent symmetric rings; and (2) asymmetric HMNs with an oblique aperture, like standard hypodermic steel needles, made by using an array of transparent asymmetric rings, defined by two circles, which centers are slightly mismatched. Simulation of light propagation, fabrication process, and preliminary results on ink microinjection are presented.

scholarly journals Fabrication of Nanowires Based on Polystyrene Derivatives by Single Particle Nano-Fabrication Technique

2012 ◽  
Vol 25 (5) ◽  
pp. 685-688
Author(s):  
Atsushi Asano ◽  
Yuta Maeyoshi ◽  
Katsuyoshi Takano ◽  
Masaaki Omichi ◽  
Masaki Sugimoto ◽  
...  
Keyword(s):  
Single Particle ◽  
Fabrication Technique ◽  
Nano Fabrication

The effects of abutment taper, length and cement type on resistance to dislodgement of cement-retained, implant-supported restorations

2003 ◽  
Vol 12 (2) ◽  
pp. 111-115 ◽  
Author(s):  
Guillermo Bernal ◽  
Mitsunobu Okamura ◽  
Carlos A. Mu[ntilde]oz
Keyword(s):  
Cement Type

An FTIR, SEM and EDS investigation of solidification/ stabilization of chromium using portland cement Type V and Type IP

1992 ◽  
Vol 30 (3) ◽  
pp. 273-283 ◽  
Author(s):  
M.Yousuf A. Mollah ◽  
Yung-Nien Tsai ◽  
Thomas R. Hess ◽  
David L. Cocke
Keyword(s):  
Portland Cement ◽  
Cement Type ◽  
Type V
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