also be tapered as previously described to reduce the contact area between the appliance 302 and the container 304 fig1 shows an assembly 400 combining beneficial characteristics of both assemblies 200 and 300 the appliance 402 has a body 452 extending from a bonding base 450 and an adhesive 456 extends along at least a portion of the bonding surface of the base 450 once again the appliance 402 is received in the recess 406 of a container 404 having opposing surfaces 410 412 in this embodiment however the surfaces 410 412 have a u201c stair step u201d configuration with alternating horizontal and vertical edges provided at a fine scale as a result the surfaces 410 412 are functionally tapered on a macroscopic scale while parallel on a microscopic scale like other tapered configurations the use of a stair step pattern can enable the container 404 to accommodate a range of base sizes but provides the added benefit of creating a u201c positive stop u201d against the horizontal edges of the surfaces 410 412 when seating the appliance 402 in the recess 406 having a positive stop in turn helps avoid over compressing the appliance 402 in the container 404 which could lead to difficulties in removal the stair steps may also be radiused to reduce the likelihood of the appliance 402 inadvertently slipping past one of the surfaces 410 412 and disengaging from the container 404 a further variant is provided in fig1 which shows an assembly 500 with an appliance 502 and container 504 the appliance 502 resides in a recess 506 of the container 504 and is essentially identical to appliances previously described the container 504.