A clinical and laboratory evaluation of a new composite restorative material.

SUM MAR Y A new composite restorative material has recently been introduced for the conservative treatment of cervical erosion and hypoplastic enamel surfaces. This material was subjected to clinical evaluation and some of its physical properties determined. Excellent aesthetic results were achieved and satisfactory retention of the restorations obtained. The adaptation of the restorative material to conditioned enamel surfaces was very good but poor to etched cementum and dentine. These observations were confirmed by dye penetration studies. A mean tensile bond strength of 112,2 kg cm'* was obtained on etched enamel surfaces but much lower figures recorded on etched cementum and dentine. The effect of the cleanser on enamel, dentine and cementum was determined by means of scanning electron microscopy. OPSOMMING ’n Nuwe saamgestelde herstelmateriaal is onlangs beskikbaar gestel vir die konserverende behandeling van servikale erosie en hipoplastiese glasuuroppervlakke. Hierdie materiaal is klinies ondersoek en sekere fisiese eienskappe is bepaal. Uitstekende estese en bevredigende retensie van herstellings is verkry. Die aanpassing van die h e r s t e l ma t er i aa l aan s u u r b e h a n d e l d e glasuuroppervlakke was uiters goed; maar die aanpassing aan geetste sementum en dentien was swak. Hierdie bevindings is bevestig deur kleurstofdeurdringingsstudies. ’n Gemiddelde trekbindsterkte van 112,2 kg cm * is verkry op glasuuroppervlakke; maar heelwat laer lesings is vir geetste sementum en dentien aangeteken. Die effek van die reinigingsmiddel op glasuur, dentien en sementum is deur middel van skandeerelektronmikroskopie bepaal.