Laser curable polymerisable composition for the protection of hard tissue

A process for the protection of exposed dental surfaces or heat sensitive dental products, which comprises the following steps:

• (a) applying a one-component heat-curable sealant composition having a viscosity of at most 5 Pas (23° C.), which comprises
• (a1) a polymerisable monomer and/or oligomer having at least two polymerizable double bonds per molecule, and
• (a2) an initiator system comprising a thermally stable initiator having a 10 hour half-life decomposition temperature of from 95° C. to 135° (0.1M in benzene);
• to an exposed surface of a tooth for providing a coating on the exposed surface of the tooth, and
• (b) heating the coating obtained in step (a) to a temperature of at least 100° C. for curing the coating and forming a protective sealant coating.