This is a real-world medical entrance exam question, please give the true answer based on the question and selection. Topic name: None, Subject name: Dental
[{'content': 'During clinical examination, it was noted that patient has natural lower anterior teeth which occlude against the complete upper denture. Clinician is most likely to find: \nSelect and explain. \nA. Underlying systemic disease, B. Post extraction bone scars, C. Displaceable mandibular ridge, D. Displaceable maxillary ridge', 'role': 'user'}, {'content': 'Answer: D \nExplanation: A single complete denture is a complete denture that occludes against some or all of the natural teeth, a fixed restoration, or a previously constructed removable partial denture or a complete denture.\nThe primary consideration for a single complete denture is preservation. By opposing the natural teeth, the magnitude of force transmitted to the denture and arrangement of artificial teeth will be the major considerations while planning the denture. These will be discussed in this chapter.\nDisadvantages\nThe unfavourable force distribution by the natural teeth can cause the following adverse changes:\n\nExtensive morphological changes in denture foundation.\nJaw relationship extremes which make it difficult to arrange artificial teeth for the denture along the line of support.\nExcessively displaceable denture-bearing tissue (flabby ridges).\n\nIndications\nA single complete denture may be desirable when it is to oppose any one of the following conditions:\n\nNatural teeth sufficient in numbers not to necessitate a fixed or removable partial denture.\nA partially edentulous arch in which the missing teeth have been or will be replaced by the fixed partial denture.\nA partially edentulous arch in which the missing teeth have been or will be replaced by a removable partial denture.\nAn existing complete denture.\n\nKey Concept:\nThe characteristic features that occur when an edentulous maxilla is opposed by natural mandibular anterior teeth, including loss of bone from the anterior portion of the maxillary ridge, overgrowth of the tuberosities, papillary hyperplasia of the hard palate’s mucosa, extrusion of the lower anterior teeth, and loss of alveolar bone and ridge height beneath the mandibular removable dental prosthesis bases – also called anterior hyperfunction syndrome (Combination Syndrome)(GPT8).', 'role': 'assistant'}]