COMPLEATE DENTURE
A complete denture (also known as a full denture, false teeth or plate) is a removable appliance used when all teeth within a jaw have been lost and need to be prosthetically replaced. In contrast to a partial denture, a complete denture is constructed when there are no more teeth left in an arch, hence it is an exclusively tissue-supported prosthesis. A complete denture can be opposed by natural dentition, a partial or complete denture, fixed appliances or, sometimes, soft tissues.
BASIC REQUIREMENTS FOR IMPRESSION MAKING
- Knowledge of Basic anatomy
- Knowledge of basic reliable technique
- Knowledge and understanding of impression materials
- Skill
- Patient management
OBJECTIVES OF IMPRESSION MAKING
- RETENTION
- STABILITY
- SUPPORT
- ESTHETICS
- PRESERVATION OF REMAINING STRUCTURES
RETENTION
- Retention is defined as the ability of denture to resist the displacement against vertical forces
- Retention resists the adhesiveness of food, the force of gravity, & the forces associated with the opening of jaws.
- Retention begins with the impression. It depends upon factors that produce attachment of the denture to the mucosa.
Factors affecting Retention
- Anatomical factors
- Physiological factors
- Physical factors
- Mechanical factors
- Muscular factors
Factors affecting RetentionAnatomical factors
- Size of the denture bearing area
- Quality of the denture bearing area.
Factors affecting RetentionPhysiological factors
- Saliva and its quality
Factors affecting RetentionPhysical factors
- Cohesion
- Adhesion
- Interfacial surface tension
- Capallarity and capillary attraction
- Atmospheric pressure and peripheral seal
Impression techniques may be classified depending on:
Amount of pressure used
- Pressure technique
- Minimal pressure technique
- Selective pressure techniqueb
- Open mouth
- Close mouth
- Hand manipulation
- Functional movements
Based on the position of the mouth while making impression
Based on the method of manipulation for border molding.