Which of the following is NOT a contraindication for partial veneer crowns?

Using a partial veneer crown as a retainer for short-span fixed dental prostheses (FDPs) is considered an acceptable practice. This option is appropriate when the remaining tooth structure is sufficient and can adequately support the restoration. Partial veneer crowns are designed to cover a portion of a tooth, making them suitable as retainers in certain cases, especially if the tooth is otherwise healthy and properly positioned.

On the other hand, poor alignment of teeth, proximally bulbous teeth, and facio-lingually thin teeth present challenges that could compromise the effectiveness and longevity of partial veneer crowns. Poor alignment might prevent proper seating and fitting of the crown, while bulbous teeth can lead to inadequate retention and esthetics. Similarly, facio-lingually thin teeth may lack the necessary structure to support a crown effectively, leading to potential fractures or failure of the restoration. Thus, these factors are contraindications for using partial veneer crowns, while using one as a retainer does not inherently present a contraindication.