Relining Rebasing Repair

1. Relining Rebasing
Repair
Presented By : Dr. Sajad Hashim
supervised by : Dr. Miada nihad

20. Contents of the Report
Types of denture fractures
Causes of denture fractures
Problems with repairing fractures
Contraindications
Repair material
Procedure
Repairing fractured teeth

21. 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

22. 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

23. Faulty occlusion
Excessive amounts of masticatory force applied by some patients
Poor laboratory techniques

24. Problems with repairing fractures
May not fit well after repairs
Occlusal changes can occur

25. 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

26. 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.

27. Procedure
Assembling the segments
Pouring the cast
Preparing the fracture site
Repairing and curing

28. 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

29. Pouring the cast
Undercuts in the denture are carefully blocked out
Plaster is poured into the denture to make a cast

30. 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

31. 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

32. The denture should not be removed from the cast while curing
After curing the denture is removed, trimmed and polished

33. 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.

34. A strengthener is placeed entirely within the structure of the acrylic resin base (except in the
region of the stops)

35. 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

36. 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

37. Autopolymerizing acrylic is applied to the site using the:
Brush technique
◦ the powder is picked up using a brush moistened with monomer
sprinkle on technique
◦ The powder and monomer is sprinkled alternatively

38. 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.