From Volume 39, Issue 1, January 2012 | Pages 39-42
This review will explore the mechanism of delayed setting and inhibition of polyvinyl siloxane impression material by latex and examine the evidence for and against this phenomenon. Clinical implications are discussed and recommendations for clinical practice made.
The problem of delayed setting of polyvinyl siloxane (addition-cured silicone) when mixed with certain glove types is not new; it has been brought to the attention of the dental profession on a number of occasions in recent years. Other reports in the literature show this effect to be minimal and not as widespread as originally thought. The clinical consequence is unset impression material producing an inaccurate cast and a poorly fitting restoration; a disconcerting outcome for all involved; patient, dentist and technician.
The authors decided to investigate this topic after conducting a literature review and concluding that, since the initial interest in this topic, principally in the 1980s and 1990s, only one paper has been published addressing this topic.1
Polyvinyl siloxane impression materials, also known as addition reaction silicones or addition-cured silicones, are amongst the most popular impression materials used in restorative dentistry. They are used in a variety of clinical situations in fixed and removable prosthodontics, operative and implant dentistry.2 This is a result of their accuracy, favourable handling properties and excellent elastic recovery.3 The by-product free polymerization reaction makes them dimensionally stable and a preferred option when compared to condensation reaction silicones.
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