Most common reason for midline fracture of the maxillary denture

 # The most common reason for midline fracture of the maxillary denture is due to: 

A. Alignment of posterior teeth too far buccally

B. Lack of strength of the material itself

C. Thin palatal portion of the denture

D. Internal porosity which is common in palatal portion

The correct answer is A. Alignment of posterior teeth too far buccally.

Denture base resins are subjected to a variety of stresses during function:

• Midline fractures of dentures during function are considered a flexural fatigue failure due to cyclical deformation of the base during function. This is usually more evident in ill fitting or poorly designed dentures.

• Impact fracture may result from patients accidentally dropping the dentures.

Ref: Boucher's Prosthodontics, 13th Edition Page 137 

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