New theoretical model to measure pressure produced during impression procedure for complete dentures—Visual inspection of impression material flow

2013 ◽  
Vol 29 (5) ◽  
pp. 530-534
Author(s):  
G. Nishigawa ◽  
Y. Maruo ◽  
M. Irie ◽  
M. Oka ◽  
Y. Tamada ◽  
...  
2020 ◽  
Author(s):  
Fumiaki Yamazaki ◽  
Yusuke Mihara ◽  
Yoshinobu Maeda ◽  
Ken‐ichi Matsuda ◽  
Tomoaki Mameno ◽  
...  

2014 ◽  
Vol 794-796 ◽  
pp. 339-344 ◽  
Author(s):  
Ulf Roar Aakenes ◽  
Øystein Grong ◽  
Tor Austigard

In the present investigation the new HYB spindle extruder has been used for butt joining of 4 mm thick aluminium plates of the AA6082-T6 type at RT in one pass, employing a 1.6 mm diameter filler wire of matching composition. The test joint produced was subsequently sectioned and subjected to thorough examination in the laboratory, which included visual inspection of the surface quality and bead penetration depth, optical microscopy for visualisation and documentation of the material flow pattern and the microstructure within the joining zone and Vickers hardness testing. It is concluded that strict control of the bead penetration depth is necessary in order to obtain full bond strength. This is because the bead penetration determines the contact pressure between the filler metal and the base metal in the groove during filling.


1993 ◽  
Vol 10 (2) ◽  
pp. 15-19 ◽  
Author(s):  
A.F.J. Baggerman ◽  
F.J.H. Kessels

Tape automated bonding (TAB) is an interconnection technique for integrated circuits (ICs) with a small lead pitch and a thin assembly thickness. During inner lead bonding the flying (Au plated Cu) leads of the TAB foil are connected to the Au bumps on the bondpads of an IC. The Au bumps are deposited in the openings of a thick Novolac based resist layer by electroplating. The resist is coated on a sputtered TiW‐Au metallisation; TiW is the barrier layer between Au bump and Al bondpad. Bonding of the leads to the Au bumps requires substantial plastic deformation of the bump and lead. As a result of this deformation, the TiW barrier layer underneath the bump may crack easily. A theoretical model has been used to describe the occurrence of these cracks. This theoretical model is compared with experimental results of deformation and cracking behaviour by visual inspection of the TiW barrier and the etched cross‐sections. Separate (single point) and simultaneous (gang) bonding techniques, different gold plating baths and TAB tapes are used to study the cracking behaviour.


2018 ◽  
Vol 1 (2) ◽  
pp. 96-99
Author(s):  
Brijesh Maskey ◽  
S.R.B. Mathema ◽  
A. Bhochhibhoya

Flabby maxillary ridge is the most commonly encountered clinical condition during routine dental practice. The presence of these displaceable denture-bearing tissues often poses difficulty during fabrication of complete dentures resulting in compromised support, retention and stability. Many impression techniques and materials have been proposed in various literatures to help overcome this difficulty. These techniques vary in philosophies but are often quite time-consuming to perform, and rely on materials not commonly in use in contemporary dental practice. The purpose of this paper is to describe an impression technique for flabby ridges, using conventional impression material.


2021 ◽  
Vol 11 (16) ◽  
pp. 7386
Author(s):  
Corina-Laura Ştefănescu ◽  
Agripina Zaharia ◽  
Rodica Maria Murineanu ◽  
Cristina Gabriela Puşcaşu ◽  
Liliana Sachelarie ◽  
...  

In the case of old mobile denture wearers, one of the main problems is related to the dentures’ retention and insufficient stability. Our goal was to improve support and stability using a different type of final impression, with different types of impression materials. In this study we chose a number of three complete edentulous patients who presented for complete oral rehabilitation. They were wearing full acrylic dentures with poor support and stability. Complete examination revealed the presence of the flabby ridge. The impression methods for the prosthetic fields with a flabby ridge differ from the classical method by using techniques that involve the use of at least two impression materials with fluid consistency to record all the details of the prosthetic fields in the final impression, this being done in two steps; the impression of the flabby ridge areas must be done without pressure, in its resting position. The impression methods we applied led to the expected results, and the dentures succeeded in offering the patient the desired functional comfort. Using fluid impression material for the flabby ridge in a resting position, and a fenestrated custom tray, offered a good quality in adaptation, maintenance and stability of the final dentures.


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