The invention relates to a process of retraction of sulcus, comprising the
steps of: applying a silicone material onto and/or at the vicinity of the
boundary of a tooth and adjacent sulcus, which silicone material expands
during or after its curing reaction; applying a cap onto said tooth,
thereby forming a chamber over said silicone material, wherein said
chamber comprises as its walls the tooth, the cap and an outer section of
said sulcus; whereby said chamber allows for the silicone material to
expand into the crevice between sulcus and tooth. Said cap is at least
partially filled with a plastically deformable material when applied onto
said tooth in step; and/or said cap is deformable, especially under
biting pressure.