New Theory Illustrates the Formation of Enamel CUP-Shaped Lesions on Occlusal Surfaces
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Updated: Aug 15, 2025

Mimicking and Measuring Occlusal Erosive Tooth Wear with the "Rub&Roll" and Non-contact Profilometry
Published on: February 2, 2018
Frederico Barbosa de Sousa1, Anderson T Hara2
1Department of Morphology, Health Sciences Center, Federal University of Paraiba, João Pessoa (Paraiba), Brazil.
Abstract:
We propose a new theory for enamel cupping lesions formation. At early stages, naturally formed cupping lesions showed increased porosity at two structural prismatic traits: the central cone extending into the enamel-dentine junction and the type-I Hunther-Schreger bands (HSB), suggesting them to be the main drivers for cupping lesion formation and development. In addition, these lesions were circumscribed by type-II HSBs, which present lower surface porosity and higher resistance to wear. This theory was verified in in vitro observations, where both the central cone and the type-I HSB of cuspal enamel showed higher susceptibility to wear, potentially elucidating the mechanisms involved on cupping lesion formation.
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