What are the defects occur in acrylic denture base?
Acrylic complete denture
| Defect | Manifestation |
|---|---|
| Gaseous porosity | Porosity in a localized area of the denture base, particularly in the thicker parts. Each defect is round and sharply defined. |
| Granular porosity | Porosity appears in thin sections of the denture, which often have a ‘white and frosty’ appearance. |
What are denture base polymers?
Nowadays acrylic resin is used almost universally for denture base construction. The denture base is that part of the denture which rests on the soft tissues and so does not include the artificial teeth.
What is the ideal requirements of denture base materials?
The ideal denture base material should possess several key physical attributes. Some of these properties include biocompatibility, good esthetics, high bond strength with available denture teeth, radiopacity, ease of repair, and should possess adequate physical and mechanical properties.
What is retention in denture?
Denture retention has been defined as ‘resistance of a denture to vertical movement away from the tissues’2 and as ‘that quality inherent in the prosthesis acting to resist the forces of dislodgement along the path of insertion’.
What causes porosity in denture base?
Porosity has been attributed to variety of factors that include the following; air entrapment during mixing, monomer contraction during the polymerization, monomer vaporization associated with exothermic reaction, the presence of residual monomer, insufficient mixing of monomer and polymer, processing temperature …
What causes porosity in acrylic?
Porosity in an acrylic resin denture base is often attributed to the presence of residual monomer. Beech3 and Jagger and Huggett4 indicated that residual mono- mer causes three principle effects: porosity, dimensional change through stress relief, and decreased physical properties.
What causes porosity in denture base resin?
Which polymer is used in making artificial dentures?
Acrylic resin is the most widely used material for construction of dentures. Polymeric denture base materials are classified into five groups (or types), as shown in Table 13.1.
What are the types of denture base materials?
Denture Base Material
- Methacrylate.
- Resin.
- Acrylic Acid Resin.
- Poly(methyl Methacrylate)
- Monomer.
- Multi Walled Nanotube.
- Denture.
- Denture Base.
What is the difference between retention and stability?
Denture fit is usually described in terms of reten- tion and stability. Retention is defined as movement in the vertical plane and stability as movement in the horizontal plane. 1 Clinically, denture movement is assessed subjec- tively either by examination or the use of qualitative scales.
What are the factors of retention of dentures?
[1] The physical factors that arbitrate the retention of a complete denture are adhesion, cohesion, salivary film thickness, surface tension, and atmospheric pressure.
How do you stop porosity in a denture base?
CONCLUSIONS. Use of lower curing temperature and prolonged curing time had a beneficial effect on reducing the occurrence of porosity in the acrylic denture bases.
What is porosity in denture?
The porosity is a non-desirable characteristic to the acrylic resin denture base 24 . Severe porosity can weaken the prosthesis and result in high internal stress, leading to greater vulnerability to distortion and warpage 29 .
What is denture base resin?
Definition • DENTURE BASE: The part of a denture that rests on the foundation tissues and to which teeth are attached. • RESIN: A broad term used to describe natural or synthetic substances that form plastic materials after polymerization. –
What is shellac base plate?
Shellac base plates are used in the process of manufacturing dentures/false teeth in the field of dentistry. They provide for temporary denture plates to check the fit and feel for the patient.
How can I increase my denture retention?
Atmospheric pressure has been claimed to be an important factor in complete denture retention. For atmospheric pressure to be fully effective, there must be a lower pressure beneath the dentures and vacuum must be present.
How do you check the retention of a full denture?
Conclusion: Mandibular complete denture retention can be measured by applying oblique downward pressure on the occlusal plane at the mandibular central incisor midpoint.
What causes denture porosity?
Why shellac base plate is used?