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Examples 15 to 19 show results obtained by using adhe› sive M and changing kinds and amounts of components (A), (B) and (D) and Examples 20 to 23 results obtained by using adhesive N and changing kinds and amounts of components (A), (B) and (D). Examples 15, 20 and 21 show results obtained by using different components as component (A), Example 16 a result obtained by using a plurality of com› ponents as component (D), Example 17 a result obtained by reducing the amount of component (C), Examples 15, 18 and 19 results obtained by changing components (B) and (D), and Examples 22 and 23 results obtained by using a plurality of components as component (A). All the above examples obtained sufficient adhesive strength to both enamel and dentin. 

Comparative Examples 8 and 14 show results obtained without component (A) and exhibited low adhesive strength to both enamel and dentin. Comparative Examples 9 and 15 show results obtained by using phosphoric acid having no 

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polymerizable unsaturated group in place of component (A) and exhibited low adhesive strength to dentin. Comparative Examples 10 and 16 show results obtained by using com› ponent (A) in an amount above the specified range and exhibited low adhesive strength to both enamel and dentin. Comparative Examples 11 and 17 show results obtained without component (B) and Comparative Example 12 a result obtained by using HOMS having only one carboxyl group in place of component (B). Both comparative examples exhibited low adhesive strength to dentin. 

Primers were prepared in the same manner as in Example 1 and evaluated using different adhesives. The compositions of the primers, used adhesives and results are shown in Table 4. 

## EXAMPLES 24 to 36 

