RELINING & REBASING / COMPLETE DENTURE

Summary

This video explains the detailed process of relining and rebasing dentures, covering both clinical and laboratory procedures. It discusses the importance of these techniques for addressing issues like loose dentures and poor adaptation due to tissue changes. The video walks through the steps involved, from tissue preparation to making impressions and choosing the right materials, including the static and functional impression techniques. Additionally, the laboratory procedures for relining and rebasing are explored, with various methods like articulator, jig, and flask techniques. The video is a comprehensive guide for dental professionals handling these common denture adjustments.

Takeaways

• 😀 Relining is the process of resurfacing the tissue side of a denture with new base material to improve its adaptation to the tissue.
• 😀 Rebasing involves replacing the entire denture base material, keeping the original teeth intact, and is typically used when relining cannot resolve issues.
• 😀 Relining is indicated when dentures become loose due to tissue modification, poor adaptation, or in patients who cannot afford new dentures.
• 😀 Contraindications for relining include poor occlusion, poor aesthetics, unhealthy oral tissues, excessive ridge resorption, and major phonetic issues.
• 😀 The process of relining and rebasing involves four main steps: tissue preparation, denture preparation, impression making, and laboratory procedures.
• 😀 Tissue preparation includes identifying and removing hypertrophic tissue, ensuring healthy mucosa, and allowing rest for the dentures.
• 😀 Denture preparation involves relieving pressure areas, correcting occlusal disharmonies, and ensuring the posterior palatal seal is in place.
• 😀 There are three main impression techniques: static (closed and open mouth), functional, and chair-side techniques.
• 😀 In the static impression technique, a closed mouth impression is most common, with materials like zinc oxide or light-body silicone used.
• 😀 The functional impression technique uses tissue conditioners to adjust the fit of the denture, improving tissue adaptation during different physical stages.
• 😀 Laboratory procedures for relining or rebasing include methods like the articulator method, jig method, and flask method, which replace impression material with acrylic resin.

Q & A

What is the difference between relining and rebasing in denture procedures?

Relining involves resurfacing only the tissue side of a denture with new material to improve fit, whereas rebasing replaces the entire denture base material, excluding the teeth.

What are some common indications for relining or rebasing dentures?

Indications include loosening of immediate dentures after 3-6 months, poor adaptation due to ridge resorption, difficulty constructing new dentures for geriatric or chronically ill patients, and when the patient cannot afford new dentures.

What are the contraindications where relining or rebasing is not recommended?

Contraindications include unsatisfactory jaw relation, poor aesthetics of artificial teeth, abused oral tissues, excessive resorption, and major speech issues that cannot be corrected with relining or rebasing.

What is the first step in the procedure for relining or rebasing dentures?

The first step is tissue preparation, which involves identifying and removing hypertrophic tissue, ensuring the oral mucosa is free from irritation, and advising the patient to avoid wearing the denture for a few days.

How is the denture prepared during the procedure?

Denture preparation involves relieving pressure areas, correcting occlusal disharmonies through selective grinding, extending short borders with green stick compound, and ensuring the posterior palatal seal is established.

What are the different impression techniques used in relining or rebasing?

The three main impression techniques are static impression (which includes closed mouth and open mouth methods), functional impression using tissue conditioners, and chairside technique using materials like light-body silicons or zinc oxide paste.

What is the role of tissue conditioners in the functional impression technique?

Tissue conditioners help adapt the denture to functional and parafunctional stresses by softening the tissue, improving fit in three stages: plastic, elastic, and form stages.

What is the articulator method in the laboratory procedure of rebasing or relining?

The articulator method involves mounting the denture in a stone cast, trimming the denture base, and selecting whether to reline or rebase based on the amount of trimming required, followed by packing with resin for curing.

How does the flask method differ from the articulator method?

The flask method involves embedding the denture and master cast in a flask, softening the green stick, removing the impression material, and processing the denture with heat-cured resin, followed by finishing and polishing.

What are some of the materials used in making impressions for relining and rebasing?

Materials used include zinc oxide neutral impression paste, light-body silicons, mouth-temperature waxes, and tissue conditioners in powder and liquid form.