MICROSTOMIA
INTRODUCTION
Microstomia is a chronic reduction in the dimensions of the oral aperture and although it is not classified by any particular size criteria, it is defined by its effects on function or appearance.
CAUSES
- · systemic conditions or autoimmune diseases affecting the connective tissues (such as scleroderma)
- · oro-facial syndromes.{ Freeman-Sheldon (whistling face) syndrome, Burton skeletal dyslpasia,Plummer-Vinson syndrome, Treacher collins syndrome}
- · post-surgical scarring following peri-oral procedures
- · following trauma( particularly electrical or chemical burn injuries)
- · head and neck radiation,
- · fibrosis of masticatory muscles
- Prosthetic rehabilitation of microstomia patients presents difficulties at all stages, right from the preliminary impressions to insertion of prostheses.
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| A patient who has significant chronic mandibular hypomobility and reduced oral aperture following surgery and chemoradiotherapy for an intra-oral squamous cell carcinoma |
IMPRESSION TECHNIQUES
- · the use of stock impression trays of each half of the mouth for sectional impressions with heavy and light body silicone impression materials,
- · flexible impression trays made with silicone putty.
- · modeling plastic impression compound has also been described to make sectional impressions of edentulous arches. ( mechanisms to connect sectional custom trays include hinges, plastic building blocks, orthodontic expansion screws or locking levers)
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