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Concept
Luting agent
Résumé
A luting agent is a dental cement connecting the underlying tooth structure to a fixed prosthesis. To lute means to glue two different structures together. There are two major purposes of luting agents in dentistry – to secure a cast restoration in fixed prosthodontics (e.g. for use of retaining of an inlay, crowns, or bridges), and to keep orthodontic bands and appliances in situ.
In a complex restoration procedure, the selection of an appropriate luting agent is crucial to its long-term success. In addition to preventing the fixed prosthesis from dislodging, it is also a seal, preventing bacteria from penetrating the tooth-restoration interface.
Zinc phosphate is the oldest material available and has been used in dentistry for more than a century. The introduction of adhesive resin systems made a wide range of dental materials available as luting agents. The choice of luting agent is dependent on clinical factors including dental occlusion, tooth preparation, adequate moisture control, core material, supporting tooth structure, tooth location, etc. Research has determined that no single luting agent is ideal for all applications.
There are many dental luting agents available. Recently introduced agents such as resins and resin-modified glass-ionomer cement (RMGIC) are claimed to perform better clinically that some traditional ones due to their improved properties. Ultimately, the durability of restoration attached to the tooth surface using lutes depends on several factors, for instance strength of materials used, operator's skills, tooth type, and patient's behaviour.
Dental lutes can be classified in many ways, some of which based on:
(i) user's knowledge and experience of use
conventional: zinc phosphate, zinc polycarboxylate, and glass-ionomer (GI)
contemporary: resin-modified glass-ionomer cement (RMGIC) and resin
(ii) type of setting mechanism
acid-base reaction: zinc phosphate, zinc polycarboxylate, glass-ionomer
polymerisation: resin-modified glass-ionomer cement (RMGIC) and resin
(iii) the expected duration of use of restoration
definitive (long term): zinc phosphate, zinc polycarboxylate, glass-ionomer, resin-modified glass-ionomers (RMGIC) and resin
provisional (short term): eugenol, non-eugenol, resin, or polycarboxylate based
This is the luting cement that has been about for the longest and has become very firmly established.
Source officielle
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