2. Denture adhesives
• 1st denture adhesive used in late 18th century
• Documented in 19th century
• Initial formula by mixing vegetables
•water absorption
•bio adhesion by
carbonyl group
MOA
5. Indications
• JR
• Try in
• Increase adaptiveness
• Xerostomia
• Alzhemers
• Parkinson’s
Contraindications
• Allergic to adhesives
• Excessive bone loss
• Poor oral hygenic
• Mentally retarded pt
6. Rebasing
Rebasing involves replacement of entire denture
base. It is a process of refitting a denture by the
replacement of the denture base without
changing the occlusal relationships of the teeth.
7.
8. Relining
Relining involves replacement of tissue surface of an
existing denture. It refers to the process of adding
base material to the tissue surface of the denture in a
quantity to fill the space which exists between the
original dental contour and altered tissue contour.
9.
10.
11. Relining Classification
a. Hard reline materials: To improve the fitting surface of the
denture.
b. Soft lining materials: Some patients are unable to tolerate
a hard denture base and must be provided with a
permanent Soft cushion on the fitting surface of the
denture.
c. Tissue conditioners: To act as a cushion, which will enable
traumatized soft tissues to recover before recording an
impression for a new denture.
15. All the tissue conditioners
are soft liners but all the
soft liners are not tissue
conditioners
16. Materials Drawbacks
Self-cure acrylic resins
Many of these materials
generate sufficient heat
to injure oral tissue.
Monomer can be
leached out of the resin
to irritate soft tissues.
Heat-cure acrylic resins:
heat generated and it
may distortion of the
existing denture base .
18. Indications
• In such cases soft lining on the denture will help to
relieve the pain and increase patient acceptance of the
denture.
Patients who cannot tolerate a hard denture base.
patient has a thin residual mucosa.
Areas of severe undercuts or congenital or acquired defects of the palate.
19. composition
• Natural rubber
• Vinyl resins
• Plasticized heat cure acrylic (P/L form) Powder: Acrylic resin polymer
and copolymer (butyl methacrylate), initiator (Benzoyl peroxide),
Liquid: Acrylic monomer and plasticizers (Di butyl phthalate).
• Plasticized self-cure acrylics. Powder: PMMA + PEMA Liquid: 60–80%
of plasticizer and ethylene glycol. Do not contain acrylic monomers.
• hydroxy ethyl methacrylate (HEMA).
20. Failures or problems with the use of
soft lining material
• Inadequate bonding to the denture base.
• Hardening of liners due to the leaching of plasticizers from
these materials.
• Decrease in the denture base strength due to reduction in base
thickness may result in fracture during clinical service.
• Difficult in trimming, adjusting and polishing of soft liners.
• Difficulty in cleaning.
• Support the growth of the fungus, e.g.: Candida albicans
21. Tissue Conditioners
Tissue conditioners are soft liners used to treat an
irritated mucosa supporting a denture.
Relining the ill-fitting denture with a tissue conditioner
allows the tissues to return to normal at which a new
denture can be made.
