For each g > 0 $g>0$ we give infinitely many knots that are strongly negative amphichiral, hence rationally slice and representing 2-torsion in the smooth concordance group, yet which do not bound any locally flatly embedded surface 4-ball with genus less than or equal to $g$ . Our examples also allow us answer a question about four-dimensional clasp number of knots.

axial vibration effect of shell particles on dynamic stability of a cantilevered cylindrical shell under an axial follower force was addressed. in spite of free-ended shells, the reduced axial force under this effect cannot be derived analytically. instead, an approximate method was proposed based on the fact that the static (and harmonic) axial deformation under an axial load in a free-ended b...

AIM There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and consid...

The purpose of this study was to evaluate the retentive forces over time removable partial denture clasps fabricated by digital method. Occlusal rest seats were on three premolar teeth fixed in acrylic blocks (9 × 20 40 mm). Digitization performed using a laboratory scanner (Zirkonzahn Scanner S600 GmbH, Gais, Italy). After analysis and determination insertion axis, two types with mesial occlus...

Aim: There is little information considering the framework association between cast clasps and attachments. The aim of this study was to evaluate the retention strength of frameworks match circumferential clasps and extra resilient attachment cast in three different alloys (cobalt-chromium, nickel-chromium titanium and commercially pure titanium), using two undercut (0.25 and 0.75 mm) and consi...