نتایج جستجو برای: chamfer angle

تعداد نتایج: 130982  

2010
ABDULHAMAID ABDULLA MAGHRABI

Fiber-reinforced composite restorations provide excellent esthetics; however, little is known regarding the influence of margin design on marginal accuracy and breaking strength for this type of crown. This study evaluated the effect of variations in tooth preparation design on the marginal accuracy and breaking strength of fiber-reinforced composite crowns. Three metal dies with a total conver...

2009
Jérôme Hulin Edouard Thiel

The test mask TM is the minimum neighbourhood sufficient to extract the medial axis of any discrete shape, for a given chamfer distance mask M. We propose an arithmetical framework to study TM in the case of chamfer norms. We characterize TM for 3×3 and 5×5 chamfer norm masks, and we give an algorithm to compute the appearance radius of the vector (2, 1) in TM.

Journal: :Journal of prosthodontics : official journal of the American College of Prosthodontists 2017
Russell Johnson Ronald Verrett Stephan Haney Michael Mansueto Suman Challa

PURPOSE This in vitro study evaluated and compared the vertical marginal gap of cast and milled full coverage gold copings using two margin designs (chamfer and chamfer bevel) before and after fitting adjustments. MATERIALS AND METHODS Ten impressions were made of two metal master dies (one chamfer margin, one chamfer-bevel margin) and poured twice in Type IV stone. The 20 subsequent casts wi...

Journal: :Operative dentistry 2009
Muharrem Comlekoglu Mine Dundar Mutlu Ozcan Mehmet Gungor Bulent Gokce Celal Artunc

The current study evaluated the effect of different cervical finish line designs on the marginal adaptation of a zirconia ceramic. Four different marginal finish lines (c: chamfer, mc: mini-chamfer, fe: feather-edge and s: rounded shoulder) were prepared on phantom incisors. Die models for each preparation group (N = 28, n = 7 per finish line design group) were made of epoxy resin. Y-TZP (ICE Z...

Journal: :IEEE transactions on image processing : a publication of the IEEE Signal Processing Society 1998
Muhammad Akmal Butt Petros Maragos

The distance transform has found many applications in image analysis. Chamfer distance transforms are a class of discrete algorithms that offer a good approximation to the desired Euclidean distance transform at a lower computational cost. They can also give integer-valued distances that are more suitable for several digital image processing tasks. The local distances used to compute a chamfer ...

2015
Xu Jing Huang Haiming Huang Guo Mo Song

Various gaps in the surface of the supersonic aircraft have a significant effect on airflows. In order to predict the effects of attack angle, Mach number and width-to-depth ratio of gap on the local aerodynamic heating environment of supersonic flow, two-dimensional compressible Navier-Stokes equations are solved by the finite volume method, where convective flux of space term adopts the Roe f...

1998
Wim H. Hesselink

An algorithm Mscan is proposed for the computation of the distance transform of a feature in an image with respect to a chamfer distance. The algorithm is na vely simple and can therefore be easily parallellized. It seems to be new, even for special cases. It is not correct for arbitrary chamfer distances but, by a general analysis of masks and their weights, suucient conditions for its correct...

2017
Syed Rashid Habib Mohammed Ginan Al Ajmi Mohammed Al Dhafyan Abdulrehman Jomah Haytham Abualsaud Mazen Almashali

Objective The aim of this in vitro study was to investigate the effect of Shoulder versus Chamfer margin design on the marginal adaptation of zirconia (Zr) copings. Materials and Methods 40 extracted molar teeth were mounted in resin and prepared for zirconia crowns with two margin preparation designs (20=Shoulder and 20=Chamfer). The copings were manufactured by Cercon® (DeguDent GmbH, Germa...

2003
Abdul Ghafoor Rao Naveed Iqbal Shoab Ahmed Khan

Image matching is an important task. There are many available methods for occluded image matching. In this paper we propose new simple image-matching algorithm, modified chamfer matching algorithm (MCMA). Distance transform and conventional chamfer matching algorithm are explained. Examples to demonstrate the algorithm and necessary results are also included. Proposed MCMA is robust, and to an ...

2009
M. Nouby D. Mathivanan K. Srinivasan

This paper proposes an approach to investigate the influencing factors of the brake pad on the disc brake squeal by integrating finite element simulations with statistical regression techniques. Complex eigenvalue analysis (CEA) has been widely used to predict unstable frequencies in brake systems models. The finite element model is correlated with experimental modal test. The ‘input-output’ re...

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