Relining And Rebasing
Relining And Rebasing Definitions
Relining: A procedure to resurface the tissue surface of the denture with new base material to make the denture it more accurately
Rebasing: A process of refitting a denture by the replacement of the denture base material
Relining And Rebasing Important Notes
Relining And Rebasing:
Indications of Relining And Rebasing:
- Immediate dentures at 3-6 months after their original construction
- When the residual alveolar ridges have resorbed and adaptation of the denture base to the ridge is poor
- When a patient cannot afford the cost of new dentures
- Geriatric or chronically ill patients
- Centric occlusion should coincide with centric relation
Contra-Indications of Relining And Rebasing:
- An excessive amount of resorption
- Abused soft tissues are present
- The patient complains of TMJ problems
- Dentures have poor esthetics
- Denture creating speech problems
- Severe osseous undercuts exists until surgical removal and healing occurs
Relining And Rebasing Short Essays
Question 1. Tissue conditioner.
Answer:
Tissue conditioners are tissue-lining materials
Functions of Tissue conditioner:
- Permit wider dispersion of forces
- Aid to decrease the force per unit area transmitted to the supporting tissues
- Serve as analog of the mucoperiosteum
Composition of Tissue conditioner:
- Polyethyl methacrylate
- Aromatic ester
- Ethyl alcohol
Uses of Tissue conditioner:
- Tissue treatment
- Temporary obturator
- Baseplate stabilization
- To diagnose the outcome of resilient liners
- Liners in surgical splints
- Trial denture base Functional impression material
Question 2. Uses of resilient liners.
Answer:
Uses of resilient liners:
- Adjuncts for tissue healing
- Preserve the residual ridge
- Heal irritated tissue
- As temporary obturator
- Done directly in the mouth
- Or indirectly after making an impression of the surgical site
- Stabilization of baseplate
- Used in presence of undercuts to stabilize the denture base and prevent its breakage
- Diagnosis of the outcome of resilient liner
- In case of chronic soreness caused by dentures
- For surgical splint
- As it is of stiffer consistency
- As a trial denture base
- As functional impression material
- In the presence of movable tissues
Read And Learn More: Prosthodontics Question And Answers
Question 3. Open mouth relining.
Answer:
Boucher’s Technique:
Question. 4. Relining & rebasing.
Or
Indications for relining the complete denture.
Answer:
Definition:
Relining: A procedure to resurface the tissue surface of the denture with new base material to make the denture fit more accurately
Rebasing: A process of refitting a denture by the replacement of the denture base material
Indications of relining the complete denture:
- Immediate dentures after 3–6 months
- Poor adaptation of dentures
- Economic
- Old patients
Contraindications of relining the complete denture:
- Excessive residual ridge resorption
- Abused soft tissues
- TMJ problems
- Dissatisfied patients
- Abnormal jaw relations
- Patient having speech defect
- Presence of severe undercuts
Advantages of relining the complete denture:
- The need of frequent visits
- Economic
- Good fit
- Incorporation of soft liner possible
Disadvantages of relining the complete denture:
- Alters jaw relation
- Impossible to correct jaw relation, aesthetics
- Impossible to correct occlusal arrangements
- Not used in dentures with excessive resorption
Question 5. Remounting procedure.
Answer:
Used to refine the occlusion of prosthesis
Purpose of Remounting :
- Reproduce the relationship of the cast at rest & at function
- Verify the records
- Correct processing errors
- Refine occlusion
Requirements of Remounting :
- Not weaken the cast
- Not create undercut
- Be functional
- Quick & easy to fabricate
- Easy to remove
- Provide 3D fit of the denture
Methods of Remounting :
1. Groove indexing method:
- Two lines are drawn
- One line sagittally & other transversely
2. Notch indexing method:
- Notches are created one anterior & 2 posterior
3. Split remounting plates for indexing:
- Male & female remounting plates are used
- These can be fitted to one another & unlocked with the help of locking pins
Relining And Rebasing Short Question And Answers
Question 1. Conditioning of abused & irritated tissues.
Answer:
- Tissue conditioners are used
- Composition
- Polymer
- Monomer
- Liquid plasticizer
Manipulation of abused:
- Mixing ratio 1.25 parts polymer, 1 part monomer, 0.5cc plasticizer
- Mix the ingredients to form a gel
- Apply sufficient thickness of material to the tissue surface of the denture
- Insert the denture in the patient’s mouth
- Carry out border movements
Maintenance of abused:
- Avoid cleaning with a hard brush
- Use a soft brush under running water
Question 2. Clinical remounting
Answer:
Clinical remounting is done using interocclusal records
Steps of Clinical remounting:
- Occlusal surface of the maxillary denture was lubricated with Vaseline and inserted into mouth
- Two layers of aluwax are placed over posterior teeth in mandibular fixed partial denture
- Wax is sealed to the denture
- A mandibular fixed denture is inserted in the mouth and the mandible is guided into centric relation
- Next patient is asked to close his mouth such that maxillary teeth penetrate about 1-1.5 mm deep into the wax
- Dentures are removed
- They are reinserted and the process is repeated with complete closure
- A maxillary denture is mounted on the articulator using a remount cast
- A mandibular denture is repositioned against the articulated maxillary denture using a centric record and articulated
Question 3. Functional relining technique.
Answer:
Functional relining technique:
- Suggested by Winkler
- The patient is advised to avoid nightwear of the denture
- Occlusal correction is carried out
- Overextension of the denture are corrected
- The tissue surface is reduced
- The tissue conditioning material is placed
- A denture is inserted in patient’s mouth
- Impression is removed
- Trim the excess material
- The denture is inserted
- Recall the patient after 3 to 5 days
- Examine the depressed areas and renew the material
- The impression is next made with ZOE and the cast is poured
Question 4. Instructions for patients in care & maintenance of tissue conditioners.
Answer:
Instructions for patients in care & maintenance of tissue conditioners:
- Tissue conditioners should not be cleaned by scrubbing with a hard brush to prevent tearing of material
- The use of soft brush under running water should be done
- They tend to harden and roughen within 4 to 8 weeks due to the loss of plasticizers
- Hence, periodic visits should be carried out
Relining And Rebasing Viva Voce
1. Elastic stage of the tissue conditioner is reached in 1- 2 weeks