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口腔,修复,精品,课件,中山大学,模型口腔,修复,精品,课件,中山大学,模型
Chapter 8
Impression, Casts and Jaw
Relationship of RPDRelationship of RPD
Wu Shuyi
Requirement of RPD impression
• Record accurately the anatomic form of the
abutment teeth and remaining teeth
•• Record completely and Record completely and accurately accurately the the anatomic anatomic
form of tissue surrounding the remaining teeth ,
residual ridge and area covered by the denture
• Record the functional status of soft tissue
Types of Impression
1. Anatomical impression: without pressure
impression; hard and soft tissue in condition of
rest; for tooth borne RPD and tissue borne RPD
Types of Impression
2. Functional impression : Under functional pressure,
the long edentulous area and distal extension
occur deformation. In this condition, the
impression is made; impression is made; ffor toothor tooth tissuetissue borne RPDborne RPD
Impression Tray
• stock tray
• individual tray
Stock Tray
• Flat floor, porous
• Different model: length and width of dental
arch, shape, height
Stock Tray
• 3~4mm interval between dental arch and
inside/outside of trays
• Border : suitable
Individual Tray
• Custom made tray for the individual patient
• Record the anatomic form of remaining teeth, the
functional form of alveolar ridge mucosa and
extended position of the impression more accurately
•• FuntionalFuntional impressinimpressin of of toothtooth tissuetissue borne RPDborne RPD
Anatomical impression of tissue borne RPD
Individual Tray
(1)Primary impression: accurate, complete
(2 )Confirming tray border: 2~3mm lower than the
mucosa reflection. Posterior border of mandible
covers all retromolar pad. Posterior border of
m
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