Dentosphere : World of Dentistry

 # Excess height of the posterior palatal seal of a complete maxillary denture will usually result in which of the following? A. Gagging B. Increased retention C. A tingling or tickling sensation D. Unseating of the denture The correct answer is D. Unseating of the denture. Over contouring or excessive beading of the posterior palatal seal causes too much pressure to be exerted on the palatal tissues resulting in the unseating of upper dentures. The posterior palatal seal is typically placed approximately on the vibrating line between the hard and soft palate and provides a physiologically acceptable tissue pressure within the compressible portion of the soft palate to attain retention and peripheral seal. Over extending the coverage of seal will cause gaggling and painful swallowing for the part of the patient. 

# Which of the following is associated with a flabby maxillary anterior ridge under a complete denture? A. Retained mandibular anterior teeth B. A "V" shaped ridge C. A "U" shaped ridge D. A patient with Class Il occlusion E. Osteoporosis  The correct answer is A. Retained mandibular anterior teeth. Combination syndrome is a condition that usually occurs when retained mandibular anterior teeth opposes a maxillary complete denture. In combination syndrome, the anterior aspect of upper maxillary ridge becomes highly resorbed and flabby due to the biting force against its natural tooth antagonist. Since the occlusal force of a natural tooth is stronger than the force of a denture supported by an alveolar ridge, the area under pressure will exhibit higher resorption pattern than the rest of the denture.