Aesthetic veneers are ideal for the treatment of discolored vital anterior teeth that do not respond well to
bleaching.
Aesthetic veneer preparation is characterized by minimal removal of the tooth structure. Ideally, porcelain veneer preparation should be confined to enamel in terms of the periphery and depth.
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Today, we are moving toward minimally invasive dentistry with the philosophy of less is more. Less tooth reduction means more adhesion and clinical longevity.
In a longitudinal study with a 12-year follow-up, ceramic veneers cemented on enamel showed significantly higher clinical longevity than those cemented on dentin, with success rates of 98.7% and 68.1%, respectively.
Deeper preparations with dentin exposure increase the risk of microleakage and adhesive fractures. Mechanical interlocking with enamel provides a more stable bonding than with dentin.
In addition, the flexural strength of the tooth/ porcelain set may be affected because dentin provides a less rigid base for restoration placement than enamel does due to its much lower modulus of elasticity than porcelain.