Laser curable polymerisable composition for he protection of hard tissue

Abstract

One-component heat-curable sealant composition for the protection of exposed dental surfaces, comprising (a) a polymerisable monomer and/or oligomer which has at least two polymerizable double bonds per molecule, and (b) an initiator system comprising benzoylperoxide in an amount of at least 2 wt.-% based on the total composition.

1 . One-component heat-curable sealant composition for the protection of exposed dental surfaces, comprising 
 (a) a polymerisable monomer and/or oligomer which has at least two polymerizable double bonds per molecule, and    (b) an initiator system comprising benzoylperoxide in an amount of at least 2 wt.-% based on the total composition.    
     
     
         2 . The one-component heat-curable sealant composition according to  claim 1  further comprising 
 (c) a heat-curable step-growth polymerization system.    
     
     
         3 . The one-component heat-curable sealant composition according to  claim 1  further comprising 
 (d) a filler or a precursor thereof.    
     
     
         4 . The one-component heat-curable sealant composition according to one of  claims 1  to  3 , further comprising 
 (e) a solvent.    
     
     
         5 . The one-component heat-curable sealant composition according to any one of the preceding claims, wherein the polymerizable monomers or oligomers are (meth)acrylate monomers or oligomers.  
     
     
         6 . The one-component heat-curable sealant composition according to any one of the preceding claims, which is polymerisable by locally heating the composition at a temperature of between 120 and 250° C., preferably between 160 to 220° C.  
     
     
         7 . The one-component heat-curable sealant composition according to any one of the preceding claims, wherein the filler comprises fine teflon particles.  
     
     
         8 . The one-component heat-curable sealant composition according to any one of the preceding claims, wherein the composition contains a precursor for a filler which is an alkoxysilane compound undergoing polycondensation reactions during heat curing of the composition, thereby forming the filler.  
     
     
         9 . The one-component heat-curable sealant composition according to any one of the preceding claims, which is a pit and fissure sealant or a cervical surface sealant.  
     
     
         10 . The one-component heat-curable sealant composition according to any one of the preceding claims, wherein the composition contains the polymerisable monomer and/or oligomer in an amount of from 10 to 99 wt.-%.  
     
     
         11 . The one-component heat-curable sealant composition according to any one of the preceding claims, wherein the composition contains benzoylperoxide in an amount of from 2.0 to 5.0 wt.-%.  
     
     
         12 . The one-component heat-curable sealant composition according to any one of  claims 3  to  14 , wherein the composition contains the filler or precursor thereof in an amount of from 0 to 30 wt.-%.  
     
     
         13 . The one-component heat-curable sealant composition according to any one of  claims 4  to  12 , wherein the composition contains the solvent in an amount of from 0 to 70 wt.-%.  
     
     
         14 . The one-component heat-curable sealant composition according to any one of the preceding claims, which has a viscosity of at most 5 Pas (23° C.).  
     
     
         15 . A process for the protection of exposed dental surfaces or heat sensitive dental products, which comprises the following steps: 
 (a) applying the one-component heat-curable sealant composition according to any one of the preceding claims 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.    
     
     
         16 . The process according to  claim 15 , wherein the heating is performed by irradiation of laser light.  
     
     
         17 . The process according to  claim 15  or  16 , wherein the protective sealant coating is formed on pits or fissures of a tooth.  
     
     
         18 . The process according to  claim 15  or  16 , wherein the protective sealant coating is formed on a cervical surface of a tooth.  
     
     
         19 . Kit-of-parts comprising a one-component heat-curable sealant composition according to any one of  claims 1  to  14  and a laser.  
     
     
         20 . Use of a composition according to any one of  claims 1  to  14  for the protection of a tooth.