Most Caries-Resistant Surface — ORE Part 1 MCQ
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Correct answer: D — Smooth labial surface of a lower incisor
The correct answer is D. Caries affects tooth surfaces in a consistent susceptibility hierarchy. Smooth surfaces of lower anterior teeth are among the least susceptible sites and are therefore the most caries-resistant option listed. They are relatively self-cleansing and readily accessible to saliva and toothbrushing. In contrast, the buccal pits and occlusal fissures of first molars are among the most susceptible sites because plaque and fermentable carbohydrate can be retained within their anatomy. A molar proximal surface, a cervical canine surface and a premolar occlusal surface may all develop caries, but none is as consistently resistant as the smooth labial surface of a lower incisor.
Reference: Batchelor PA, Sheiham A. Grouping of tooth surfaces by susceptibility to caries: a study in 5-16 year-old children. BMC Oral Health. 2004;4:2. https://pubmed.ncbi.nlm.nih.gov/15511295/