E.g.: Dyract eXtra, Glasiosite
Manufacturers have tried to combine the good properties of glass ionomer cements (good adhesion to the dental hard substance without any pre-treatment) with those of composites (easier to polish, highly aesthetic) in compomers.
To put it simply: compomers are composites filled with ground glass ionomer cement. However, expectations of this material have not been met completely.
A dentin adhesive must be used because compomers will not stick directly to the dental hard tissue. These are usually the same that are also available for use with composites. Several scientific studies have shown that additional conditioning of the tooth surface with an acid (acid etching technique) - ie identical to the processing of composites - will clearly improve adhesion and tightness of compomers (Ruse 1999, Moodley and Grobler 2003). A rubber dam must be used in order to obtain an optimal result. This means that the amount of work required is the same as when a composite filling is used. Materials and treatment steps are identical to those for the composite filling described above.
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The term 'ormocer' is short for "Organically modified ceramic". Advertising for these materials occasionally gave the impression that they are a type of 'liquid ceramic'. They are not. They were developed in order to minimise the main disadvantages of composites - their shrinking during polymerisation - by chemical changes to the synthetic matrix. That means, the ormocers' chemical structure is somewhat different from that of traditional composites. However, this has no influence on their indication and processing. The process is the same as for a composite filling meaning that a rubber dam is required and the acid etching technique and a dentin adhesive agent that are part of those systems are used. Shrinkage of these materials is probably reduced compared to composites but the shrinking forces are greater resulting in increased tension on the dental hard tissues (Chen et al. 2001).
Materials and treatment steps are identical to those for the composite filling described above.