denture repair
TRANSCRIPT
By:
Buhay, Joyce
Cruz, Vianca
DMD4A
Contents of the Report
Types of denture fractures Causes of denture fractures Problems with repairing fractures Contraindications Repair material Procedure Repairing fractured teeth
Types of Denture Fracture
Midline fractures Fracture or chipping of a
portion of the denture Complex fractures (more than
two pieces) Cracks in the denture Fracture or dislodgement of
one or more teeth
Causes of Fracture• Accidental dropping during
removal or cleaning• Inability to handle dentures due
to poor neuromuscular control• Faulty denture design resulting
in areas of inadequate thickness
• Prominent median palatine raphe with inadequate thickness
Faulty occlusion Excessive amounts of masticatory force
applied by some patients Poor laboratory techniques
Problems with repairing fractures May not fit well after repairs Occlusal changes can occur
Contraindications
The broken pieces cannot be assembled accurately
When the dentures need to be replaced anyway due to poor fit or occlusal wear or any other reason
Repair Material
Self- curing or autopolyerizing resin (not as strong as heat cured)
Visible light activated resin (VLC Triad)Easy to use, can be carved, cures quickly
and does not cause any warpage or distortion.
Procedure
Assembling the segments
Pouring the cast Preparing the
fracture site Repairing and curing
Assembling the segments• The fracture site is cleaned well of any
debris• The pieces are assembled accurately and
stabilized with an old bur and sticky wax. Quick setting cyanoacrylate glue (super glue) may also be used to hold the pieces together
• Wax should not be placed over the fracture site
• The accuracy of the assembly is carefully verified by visual inspection
Pouring the cast
Undercuts in the denture are carefully blocked out
Plaster is poured into the denture to make a cast
Preparing the fracture site The denture is separated from the cast
and 2 to 3 mm acrylic is removed from the fracture site
A wide bevel is created on either side of the fracture line
After applying separating medium, the denture is replaced back on the cast
Repairing and Curing• Autopolymerizing acrylic powder and
liquid is applied alternatively in increments till the fracture site is filled to excess
• Curing is completed by placing it in a pressure pot containing water at 100 degrees F under pressure of around 30 psi for about 30 minutes. Curing under pressure helps to increase the density and strength of the acrylic
The denture should not be removed from the cast while curing
After curing the denture is removed, trimmed and polished
Metal Strengtheners• Indicated for patients who exert great
amount of force during mastication often leading to fracture.
• May be made of metals like steel, gold, aluminum etc.
• Chromium cobalt commonly used due to lightweight, less expensive compared to gold
• Other includes the use of high impact strength resins or fibre reinforced dentuers.
A strengthener is placeed entirely within the structure of the acrylic resin base (except in the region of the stops)
Repairing Fractured Teeth• Fractured tooth must be carefully
removed using burs• Removal must be as far as possible the
labial ridge-lap area• New tooth is selected• Small amount of acrylic is placed inside
the tooth bed and the tooth carefully position into, there should be no spills on the labial side
a plaster index may also be used to position teeth
The tooth is waxed into position, after which the plaster index is made.
The tooth is removed and the wax eliminated with hot water.
The index is coated with separating media and the tooth is position with the help of the indes
Autopolymerizing acrylic is applied to the site using the:
Brush techniquethe powder is picked up using a brush
moistened with monomer
sprinkle on techniqueThe powder and monomer is sprinkled
alternatively
After setting it is cured in a pressure chamber and followed by trimming and finishing
Porcelain teeth are removed by trimming from the lingual side
Repair using light cured resin (Triad VLC) is preferable whenever available as it is easy to carve.
Happy New Year!