[Human tooth tissue as dental restorative material].

With the recent development of copy-milling systems for porcelain, it has now become possible to construct fitting restorations from natural human tooth substance. This preliminary study aimed to find out whether it is possible to produce a well fitting Class II inlay from an extracted tooth using a copy-milling machine, so that the inlay produced will have enamel over its whole outer surface and dentine on its inner surface. Two pairs of matching sound extracted permanent molars were used.

Time-and-motion study on class II copy-milled ceramic inlays.

Objectives: To obtain an estimate of working times of Class II copy-milled ceramic inlays as an indication of their efficiency, and to analyse factors of influence.

Methods: In a controlled clinical trial, 173 MO/DO or MOD ceramic inlays of the Celay system were constructed in 101 patients. Treatment was carried out by seven dentists.

In vitro dentine hardness following gamma-irradiation and freezing.

Objectives: To investigate the short term effects of gamma-irradiation and conventional freezing on the hardness of human dentine.

Methods: Twenty-one dentine disks were produced by transverse sectioning 21 sound extracted human permanent molar teeth. The 2.

Loss of sound tooth structure when replacing amalgam restorations by adhesive inlays.

The replacement of amalgam restorations by adhesive inlays requires an adjustment to the cavity form. This often necessitates the removal of sound tooth substance. Undercuts may be blocked out by a base, but an extensive use of glass ionomer for this purpose is not recommended due to the weak mechanical properties of this material.