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Orthodontic adhesives are claimed which use polymeric filler particles with defined particle size characteristics. The particle size characteristics are controlled such that these adhesives provide comparable mechanical retention and cohesive strength of conventional orthodontic adhesives when used

Orthodontic adhesives are claimed which use polymeric filler particles with defined particle size characteristics. The particle size characteristics are controlled such that these adhesives provide comparable mechanical retention and cohesive strength of conventional orthodontic adhesives when used to bond orthodontic appliances to teeth. Because polymeric fillers are generally softer than inorganic fillers, these adhesives are easier to remove from the tooth than conventional adhesives after debonding an orthodontic appliance. Embodiments of the invention include both self-curing and two-part adhesives, packaged adhesive-coated orthodontic appliances, and methods for removing a cured adhesive from a tooth surface.

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1. An orthodontic adhesive composition comprising: a hardenable component;a photoinitiator;a rigid and dimensionally stable crosslinked polymeric filler having a controlled particle size and particle size distribution,wherein the crosslinked polymeric filler has a particle size median in a range fro

1. An orthodontic adhesive composition comprising: a hardenable component;a photoinitiator;a rigid and dimensionally stable crosslinked polymeric filler having a controlled particle size and particle size distribution,wherein the crosslinked polymeric filler has a particle size median in a range from 6 micrometers to 18 micrometers and a d50/d25 particle size ratio up to 1.8; andat least one of a silica filler and a fluoroaluminosilicate glass filler. 2. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler is an emulsion polymer. 3. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler is a suspension polymer. 4. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler has a particle size median in a range from 7 micrometers to 17 micrometers. 5. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler has a particle size median in a range from 8 micrometers to 16 micrometers. 6. The orthodontic composition according to claim 1, wherein the silica filler is present in an amount up to 5 percent based on the overall weight of the composition. 7. The orthodontic composition according to claim 1, wherein the composition includes fluoroaluminosilicate glass filler and wherein the fluoroaluminosilicate glass filler is silane treated. 8. The orthodontic composition according to claim 1, wherein the fluoroaluminosilicate glass filler is present in an amount up to 40 percent based on the overall weight of the composition. 9. The orthodontic composition according to claim 8, wherein the fluoroaluminosilicate glass filler is fluoride releasing. 10. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler is derived from at least one of: poly(methylmethacrylate), poly(styrene), or poly(styrene-ethyl methacrylate). 11. The orthodontic composition according to claim 1, wherein the crosslinked polymeric filler is present in a range from 55 percent by weight to 65 percent by weight, based on the overall weight of the composition. 12. The orthodontic composition according to claim 1, wherein the hardenable component comprises a crosslinker. 13. The orthodontic composition according to claim 1, wherein the hardenable component is present in a range from 30 to 45 percent by weight based on the overall weight of the composition. 14. The orthodontic composition according to claim 1, wherein the hardenable component comprises at least one of: a urethane dimethacrylate, bis-glycidyl methacrylate, or bis-ethyl methacrylate. 15. The orthodontic composition according to claim 1, wherein the polymeric filler is present in a range from 50 to 70 percent by weight based on the overall weight of the composition. 16. An orthodontic adhesive composition comprising: a hardenable component;a photoinitiator;a rigid and dimensionally stable crosslinked polymeric filler having a controlled particle size and particle size distribution, wherein the crosslinked polymeric filler has a particle size median in a range from 6 micrometers to 18 micrometers and a d50/d25 particle size ratio up to 1.8; andan inorganic filler, wherein the inorganic filler has a Mohs hardness of at least 5 and is present in an amount up to 5 percent by weight based on the overall weight of the composition,wherein the composition is essentially free of any other inorganic fillers with a Mohs hardness of at least 5. 17. The orthodontic composition according to claim 16, wherein the crosslinked polymeric filler has a particle size median in a range from 8 micrometers to 16 micrometers. 18. The orthodontic composition of claim 16, wherein polymeric filler is present in a range from 50 to 70 percent by weight based on the overall weight of the composition. 19. A packaged article comprising: an orthodontic appliance having a base for bonding the appliance to a tooth;an adhesive on the base of the appliance, the adhesive comprising a hardenable component;a photoinitiator;a rigid and dimensionally stable crosslinked polymeric filler having a controlled particle size and particle size distribution, wherein the crosslinked polymeric filler has a particle size median in a range from 6 micrometers to 18 micrometers and a d50/d25 particle size ratio up to 1.8; anda container at least partially surrounding the orthodontic appliance having adhesive on the base thereof. 20. The article of claim 19, wherein the crosslinked polymeric filler has a particle size median in a range from 8 micrometers to 16 micrometers.