objective: one of the major problems of all ceramic restorations is their probable fracture against the occlusal force. the aim of the present in-vitro study is was to compare the effect of two marginal designs (chamfer & shoulder) on the fracture resistance of zirconia copings, cercon (cad/cam). materials and methods : this in vitro study was done with single blind experimental technique. one ...

Chamfer distances are step-based on various grids. The fourdimensional FCC grid is the extension of usual face-centred cubic into four dimensions. There two types steps, and thus, weights used. Operational research, namely linear programming Gomory cut applied to describe optimal paths hence, their weighted lengths, chamfer distance.

PURPOSE The aim of this study was to evaluate the fracture resistance and fracture behavior of monolithic zirconia crowns in accordance with the preparation design and aging simulation method. MATERIALS AND METHODS An upper first molar was prepared sequentially with three different preparation designs: shoulderless preparation, 0.4 mm chamfer and 0.8 mm chamfer preparation. For each preparati...

We study object localization problem in images, given a single hand-drawn example or a gallery of shapes as the object model. Although many shape matching algorithms have been proposed over the decades, chamfer matching remains to be among the fastest and most robust approaches in the presence of clutter. In this paper, we significantly improve the accuracy of chamfer matching while reducing th...

Standard chamfer matching techniques and their state-ofthe-art extensions are utilizing object contours which only measure the mere sum of location and orientation differences of contour pixels. In our approach we are increasing the specificity of the model contour by learning the relative importance of all model points instead of treating them as independent. However, chamfer matching is still...

The primary purposes of this investigation were to evaluate sophomore dental student performance in the production of a chamfer finish line using two diamond bur types-a round-ended bur and a torpedo-shaped bur-and to gain student feedback about their preferences for bur type. Fifty students took part in the study, each of whom prepared the buccal surfaces of two mandibular molar typodont teeth...

Correspondence to: Edson Hilgert Rua Francisco Paes, 31, apto. 22 Centro São José dos Campos CEP 12210-100 São Paulo Brazil Phone: +055 012 39227621 E-mail:[email protected] Abstract This study evaluates the marginal adaptation of ceramic copings front of two finish lines and addition of ceramic. Hence, two master steel dies were milled with all-ceramic crowns preparation, one with a round sho...

Background and Aim: One of the problems of all ceramic restorations is their risk of fracture due to occlusal loads. The aim of the present study was to compare the effect of two marginal designs (shoulder and chamfer) on the fracture resistance of IPS-emax all ceramic restorations. Materials and Methods: One extracted maxillary first premolar received chamfer 50' marginal preparation (0.8 m...

Chamfer matching is an effective and widely used technique for detecting objects or parts thereof by their shape. However, a serious limitation is its susceptibility to background clutter. The primary reason for this is that the presence of individual model points in a query image is measured independently. A match with the object model is then represented by the sum of all the individual model...