What is a common indication for using partial veneer crowns?

Partial veneer crowns are often used specifically for the purpose of splinting teeth. This is a common clinical indication, particularly in cases where there is a need to stabilize the teeth that may be compromised due to periodontal issues or mobility. By connecting teeth with a partial veneer crown, the forces during function can be distributed more evenly, thereby improving the overall structural integrity of the affected teeth.

In contrast, the other options refer to various dental situations that may not directly benefit from partial veneer crowns. For instance, while facio-lingually thin teeth may require some restorative intervention, partial veneer crowns are not always the first choice in such cases; other restorative techniques or materials might be more appropriate to preserve the tooth structure. Similarly, teeth that are proximally bulbous or poorly aligned might need different forms of treatment, such as orthodontics or full crowns, depending on their specific conditions, rather than partial veneer crowns which are more tailored to situations warranting stabilization through splinting.