Permanent soft bases
Introduction :
When a thin, sensitive and vulnerable senescent mucosa can no longer act as a shock absorber for interocclusal pressures, contact with a hard base becomes unbearable for the patient.
Principle:
The principle is to remove about 2mm of thickness from the acrylic resin prosthetic base and replace it with a flexible (elastic) material. This replacement involves all or part of the support surface.
Indications
- Hyphaemic, floating mucous membranes, detached from the underlying bone
- Thin mucous membranes covering an incompressible area (knife-blade ridge, prominent internal oblique line, mandibular torus, etc.)
- Significant resorption exposing nerve endings.
Materials:
The most commonly used elastic materials:
- Copolymers of methyl methacrylate and butyl ester of acrylic acid.
- Silicone rubbers such as GC Reline Soft®
- Semi-organic fluoroelastomers.
Clinical procedure
The clinical procedure for relining (partial repair of the bases) includes:
- Tissue preparation:
- Surgical resection of hypertrophied tissues
- Removal of prostheses
- Tissue conditioning
- Preparation of the prosthesis:
- Grinding of compression zones
- Correction of occlusal disharmonies
- Removal of undercuts
- The resin of the intrados is ground to a thickness of 1.5 to 2 mm.
- The edge of the prosthesis is reduced and flattened
- The imprint:
This can be a classic anatomical-functional impression in the chair in the centric relation position, or an ambulatory impression with tissue conditioning material.
Laboratory production:
The production can be done on a semi-adaptable articulator, on a flange or in a muffle.
Depending on the material, polymerization will be done cold or hot.
- Formwork of the imprint
- Casting the model: in one step in the absence of undercuts, in 2 steps in the presence of significant undercuts
- Removal of impression material.
- Reduction of the intrados.
- Placing the soft relining material
- In a hurry.
- Chairside Rebasing Technique
Several products are marketed as chairside relining products, the technique is less precise than laboratory rebasing and if the material contains methyl methacrylate, polymerization can cause burns.
Disadvantages of soft bases:
- Gradual hardening of the soft material
- Possible detachment
- Microbial colonization
Untreated cavities can reach the nerve of the tooth.
Porcelain veneers restore a bright smile.
Misaligned teeth can cause headaches.
Preventative dental care avoids costly treatments.
Baby teeth serve as a guide for permanent teeth.
Fluoride mouthwash strengthens tooth enamel.
An annual checkup helps monitor oral health.