a) The partial denture becomes cumbersome
b) Ridge resorption occurs
c) Its is not economical
d) No disadvantages present
The correct answer is B. Ridge resorption occurs.
Stress breaker or equalizer is a device that allows some movement between the denture base and the direct retainer. This type of design protects the vulnerable abutment teeth and concentrates more stresses on the residual ridge.
Its disadvantages are:
• Increased residual ridge resorption
• Difficulty to fabricate and repair
• Less tolerated by the patient
• The need for frequent relining
• High cost
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