简介:SincetheinventionofRubylaserbyMaimanin1960s,manykindsoflasersareusedwidelyindentistry.Ithasbeenprovedthatlaserirradiationcanproduceacidetchinglikesurface,thusstrengthenthebondofmaterialtoenamel.Buttheheatgeneratedduringirradiationproducesdamageondentalpulp,whichlimitsthelaserapplicationsondentalhardsurfaces.
简介:在ABC中,有著名的Finsler-Hadwiger不等式∑a2≥43+∑(b-c)2.