Thermal expansion of composite resins and sealants

Linear thermal coefficients of expansion (a) of seven commercial composite resins and four pit and fissure sealants were determined between 0 and 600C on a thermomechanical analyzer. The thermal expansion curves obtained were nonlin-ear. Values of a ranged from 26.5 to 39.6 x 106 OIC for the composite and from 70.9 to 93.7 x 10-0/°C for the sealants