these include ( 1 ) decreasing caries rates among children and young adults , ( 2 ) increasing numbers of older adults in the population , ( 3 ) increasing retention of natural teeth by the elderly , ( 4 ) increasing prevalence of coronal and root surface caries associated with advanced age , ( 5 ) large unmet need for prosthodontic care projected for coming years , and ( 6 ) significant disposable income available to many older persons .
C0011334
caries
C0162644
root surface caries