ESTHETIC UPDATES IN PROSTHODONTICS Joseph R. Greenberg, DMD Howard E. Strassler, DMD, FADMPOOLINC OF LONG‐TERM CLINICAL WEAR DATA FOR POSTERIOR COMPOSTTES D.F. Taylor, S.C. Bayne, K.F. Leinfelder, S. Davis, and G.G. KochSILICA CONTAMINATION OF ETCHED DENTIN AND ENAMEL SURFACES: A SCANNING ELECTRON MICROSCOPIC AND BOND STRENGTH STUDY J. Perdigao, DDS, G.E. Denehy DDS, MS, and E.J. Swift Jr., DDS, MSEFFECT OF A SILICA‐CONTAINING ETCHANT ON SHEAR BOND STRENGTH TO DENTIN M.L. Myers, DMD, G.L. Dickinson, DDS, MS, and S.L. Hoyle, CDA.AN ANALYSIS OF SELECTED NORMATIVE TOOTH PROPORTIONS R.J. Gillen, DMD, R.S. Schwartz, DDS, T.J. Hilton, DMD, D.B. Evans, DDS