In terms of cavity preparation, what is the biggest risk of leaving unsupported enamel?

Leaving unsupported enamel during cavity preparation poses a significant risk because it compromises the structural integrity of the tooth. Unsupported enamel may be more prone to fracture or chipping, which can undermine the effectiveness of the restoration. When enamel is not adequately supported by dentin, the forces exerted on the tooth—especially during chewing—can lead to stress concentrations that may cause the restoration to fail over time.

This is critical for long-term success, as failure to address unsupported enamel can result in secondary caries, further decay, or even complete failure of the restoration, necessitating additional invasive procedures. Thus, ensuring that all enamel is properly supported during cavity preparation is essential for maintaining the health of both the tooth structure and the restoration itself.