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Concept
Dental cement
Résumé
Dental cements have a wide range of dental and orthodontic applications. Common uses include temporary restoration of teeth, cavity linings to provide pulpal protection, sedation or insulation and cementing fixed prosthodontic appliances. Recent uses of dental cement also include two-photon calcium imaging of neuronal activity in brains of animal models in basic experimental neuroscience.
Traditionally cements have separate powder and liquid components which are manually mixed. Thus working time, amount and consistency can be individually adapted to the task at hand. Some cements, such as GIC, can come in capsules and are mechanically mixed using rotating or oscillating mixing machines. Resin cements are no cements in a narrower sense, but rather polymer based composite materials. ISO 4049: 2019 classifies these polymer based luting materials according to curing mode as class 1 (self-cured), class 2 (light-cured), or class 3 (dual-cured). Most of the commercially available products are class 3 materials, combining chemical- and light-activation mechanisms.
High biocompatibility - zinc phosphate cement is considered the most biocompatible material with a low allergy potential despite the occasional initial acid pain (as a consequence of inadequate powder/liquid ratio)
Non irritant. Polycarboxylate cement is considered the most sensitive type due to the properties of PAA.
Antibacteria properties to prevent secondary caries
Provide a good marginal (bacteria-tight) seal to prevent marginal leakage.
Resistant to dissolution in saliva, or other oral fluid – a primary cause of decementation is dissolution of the cement at the margins of a restoration.
High strength in tension, shear and compression to resist stress at the restoration-tooth interface.
High Compressive strength (minimum 50 microns acc. to ISO 9917-1)
Adequate working and setting time.
Good aesthetics.
Good thermal insulation properties as a liner under metal restorations
Opacity – for diagnostic purposes on radiographs.
Low film thickness (maximum 25 microns acc.
Source officielle
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