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Processes for forming dental materials that include applying a first hardenable dental composition (e.g., a dental adhesive) to a surface followed by applying a second hardenable dental composition (e.g., a dental composite) to the first hardenable dental composition on the surface. The first and se

Processes for forming dental materials that include applying a first hardenable dental composition (e.g., a dental adhesive) to a surface followed by applying a second hardenable dental composition (e.g., a dental composite) to the first hardenable dental composition on the surface. The first and second hardenable dental compositions are hardened such that the second hardenable composition is substantially completely hardened prior to complete hardening of the first hardenable composition.

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What is claimed is: 1. A process for forming a dental material adhered to an oral surface, the process comprising: applying a hardenable dental adhesive to an oral surface, wherein the hardenable adhesive comprises a first photoinitiator that absorbs radiation within a range of about 380 nm to abou

What is claimed is: 1. A process for forming a dental material adhered to an oral surface, the process comprising: applying a hardenable dental adhesive to an oral surface, wherein the hardenable adhesive comprises a first photoinitiator that absorbs radiation within a range of about 380 nm to about 450 nm; applying a hardenable dental composite to the hardenable dental adhesive on the oral surface, wherein the hardenable dental composite comprises a second photoinitiator that absorbs radiation within a range of about 450 nm to about 520 nm; irradiating the hardenable dental composite with radiation within a range of about 450 nm to about 520 nm to selectively harden the hardenable dental composite; and subsequently irradiating the hardenable dental adhesive with radiation within a range of about 380 nm to about 450 nm to harden the dental adhesive and adhere the dental composite to the oral surface; wherein neither the first photoinitiator nor the second photoinitiator absorbs radiation above about 520 nm. 2. The process of claim 1 wherein the hardenable dental adhesive comprises a free radically polymerizable composition, a cationically polymerizable composition, or combinations thereof. 3. The process of claim 1 wherein the hardenable dental adhesive, hardenable dental composite, or both further comprises a filler. 4. The process of claim 1 wherein the first photoinitiator comprises a phosphine oxide. 5. The process of claim 4 wherein the phosphine oxide is selected from the group consisting of acyl and bisacyl phosphine oxides. 6. The process of claim 5 wherein the phosphine oxide is a bisacyl phosphine oxide of the general formula: description="In-line Formulae" end="lead"R1 P(═O)(C(═O)R2)2description="In-line Formulae" end="tail" wherein: R1 is a hydrocarbyl group; and each R2 is independently a hydrocarbyl group, an S--, O--, or N-containing five-or six-membered heterocyclic group. 7. The process of claim 6 wherein the phosphine oxide is bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide, bis(2,6-dimethoxybenzoyl)-(2,4,4-trimethylpentyl) phosphine oxide, or a combination thereof. 8. The process of claim 1 wherein the second photoinitiator comprises a monoketone, diketone, or combinations thereof. 9. The process of claim 8 wherein the second photoinitiator is selected from the group consisting of camphorquinone, benzil, furil, 3, 3,6,6-tetramethylcyclohexanedione, phenanthraquinone, and combinations thereof. 10. The process of claim 9 wherein the second photoinitiator is camphorquinone. 11. The process of claim 1 wherein the dental adhesive comprises a free radical inhibitor. 12. The process of claim 11 wherein the free radical inhibitor is preset in an amount of about 0.05 wt-% to about 1.0 wt-% based on the weight of the dental adhesive without filler. 13. The process of claim 1 wherein the photoinitiators are nearly colorless, pale yellow, or yellow in coloration prior to and after irradiation with light having a wavelength range of about 380 nm to about 520 nm. 14. The process of claim 1 wherein the hardenable dental adhesive comprises a siloxane-functional (meth)acrylate, a fluoropolymer-functional (meth)acrylate, or a combination thereof. 15. The process of claim 1 wherein the hardenable dental composite comprises a free radically polymerizable composition, a cationically polymerizable composition, or combinations thereof. 16. A process for forming a dental material adhered to an oral surface, the process comprising: applying a hardenable dental adhesive to an oral surface, wherein the hardenable dental adhesive comprises a phosphine oxide that absorbs radiation within a range of about 380 nm to about 450 nm; applying a hardenable dental composite to the hardenable dental adhesive on the oral surface, wherein the hardenable dental composite comprises a diketone that absorbs radiation within a range of about 450 nm to about 520 nm; irradiating the hardenable dental composite with radiation within a range of about 450 nm to about 520 nm to selectively harden the dental composite; and subsequently irradiating the hardenable dental adhesive with radiation within a range of about 380 nm to about 450 nm to adhere the dental composite to the oral surface; wherein neither the Phosphine oxide nor the diketone absorbs radiation above about 520 nm. 17. The process of claim 16 wherein the phosphine oxide and the diketone are nearly colorless, pale yellow, or yellow in coloration prior to and after irradiation with light having a wavelength range of about 380 nm to about 520 nm. 18. The process of claim 16 wherein the hardenable dental adhesive comprises a siloxane-functional (meth)acrylate, a fluoropolymer-functional (meth)acrylate, or a combination thereof. 19. The process of claim 16 wherein the phosphine oxide is selected from the group consisting of acyl and bisacyl phosphine oxides. 20. The process of claim 19 wherein the phosphine oxide is a bisacyl phosphine oxide of the general formula: description="In-line Formulae" end="lead"R1 P(═O)(C(═O)R2)2description="In-line Formulae" end="tail" wherein: R1 is a hydrocarbyl group; and each R2 is independently a hydrocarbyl group, en S--, O--, or N-containing five-or six-membered heterocyclic group. 21. The process of claim 20 wherein the phosphine oxide is bis(2,4,6-trimethylbenzoyl)phenyl phosphine oxide, bis(2,6-dimethoxybenzoyl)-(2,4,4-trimethylpentyl) phosphine oxide, or a combination thereof. 22. The process of claim 16 wherein the diketone is selected from the group consisting of camphorquinone, benzil, furil, 3,3,6,6-tetramethylcyclohexanedione, phenanthraquinone, and combinations thereof. 23. The process of claim 22 wherein the photoinitiator is camphorquinone. 24. The process of claim 16 wherein the dental adhesive comprises a free radical inhibitor. 25. The process of claim 24 wherein the free radical inhibitor is present in an amount of about 0.05 wt-% to about 1.0 wt-% based on the weight of the dental adhesive without filler.