Bondable orthodontic assemblies and methods for bonding

An orthodontic appliance comprising:

• a base;
• and
• an hardenable adhesive layer disposed on the base,
• the adhesive layer comprising a first region and a second region,
• the first region comprising a high-viscosity adhesive composition characterized by having a viscosity of about 10 Pa·s to about 1,500,000 Pa·s at a shear rate of 1 s−1, and
• the second region comprising a low-viscosity adhesive composition characterized by having a viscosity of about 0.1 Pa·s to about 100 Pa·s at a shear rate of 1 s−1,
• wherein the first region is at least partly surrounded by the second region,
• wherein the first region and the second region are configured to contact a tooth surface, and
• wherein the viscosity of the high-viscosity adhesive composition is greater than the viscosity of the low-viscosity adhesive composition.