reline, rebase and repair

what is relining?

resurfacing or correction of denture adaptation to underlying tissues by the addition of a new resin material to its fitting surface without changing its occlusal relation (the fitness

when is relining done?

the fitting surface of the denture has deteriorated but it is not necessary to construct a new one

what is rebasing?

the laboratory process of re-adaptation of a denture to the underlying tissues by replacing the denture base material with a new one without changing its occlusal relation

what are the indications for relining?

• poor adaptation due to bone resorption

• loose denture

• immediate dentures

• to avoid construction of new dentures

what are the indications for rebasing?

• stained denture base

• crazed denture base

• porous denture base

• frequently relined denture

• unesthetic denture base

what are contraindications for reline and rebase?

1. Excessive bone resorption.

2. Abused soft tissue.

3. Patient complaint from TMJ problem.

4. Poor esthetics

5. incorrect position of teeth.

6. Unsatisfactory jaw relation.

7. Major speech problem.

8. If denture looseness is not due to poor fit.

9. severe osseous undercuts.

what do relines solve?

they will only solve retention problems related to denture base adaptation. retention problems must be the problem for relining to work and be effective. looseness caused by another issue that is not retention problems related to adaptation will not be solved by relining

what are the advantages of relining?

1. increases stability and retention of the denture

2. provides good force distribution

3. correct occlusion and vertical dimension

4. increases esthetics and restores facial support

what are the disadvantages of relining?

1. may increase VOD (vertical dimension of occlusion) and produce occlusal records

2. increases the thickness of denture bases

3. displacement of the denture base which may produce labial prominence and change occlusal plane

4. alter palatal contour which may change speech

5. vertical position, centric relation, patient control, material manipulation and esthetics are difficult to satisfy all at once

what is the patient instructed to do prior to denture relining and rebasing?

• patient is instructed to leave their denture out of his mouth at least 3 days

• hypertrophic tissues should be removed or healed

• absence of any tissue irritation

• daily massage of the tissue

what are the steps of indirect (laboratory) procedure of relining?

• border molding

• impression under COR

• verifying position

• boxing

• the denture is flasked

• packing and curing

what is the aim of resilient soft liners?

better absorption and distribution of masticatory forces

what are some indications for resilient soft liners?

• extremely atrophied ridge

• irregularly resorbed and sharpened ridge

• severe alveolar ridge undercut and surgery is contraindicated

• bruxism

• edentulous arch opposing natural dentition

what are the steps of direct (functional) relining?

1. patient preparation

2. denture preparation

3. cold-cure acrylic or tissue conditioner material is used

4. mixing and application

5. insertion and patient is asked to close on proper CR

how should the functional reline be done?

the reline material is applied to the fitting surface of the denture, and it has a setting time of about 8–10 minutes. the denture is inserted into the patient's mouth, and light border molding is performed to shape the denture borders. while the material is setting, the patient is instructed to talk, swallow, and lightly occlude (bite together). after the material has set, any excess is trimmed from the flanges using a hot scalpel or knife, and excess material is also removed from the teeth and polished (oral) surfaces of the denture

what is done after the material has set in functional reline?

any excess is trimmed from the flanges using a hot scalpel or knife, and excess material is also removed from the teeth and polished (oral) surfaces of the denture. it is less time consuming than indirect method but it is not very durable

what is one of the advantages of using acrylic resin in denture bases?

for repair

what causes fracture in complete dentures?

1. intraorally during function

2. extraorally such as dropping the denture on a hard surface