What is an advantage of bevel placement at the margins during a composite preparation?

Bevel placement at the margins during a composite preparation is advantageous because it effectively removes the outer layer of enamel, which can enhance the etching process. This removal exposes a fresh layer of enamel for bonding and allows for a more effective adhesion of the composite material to the prepared tooth structure. By beveling the margins, you are creating a smoother transition between the tooth and the restoration, which can contribute to a more aesthetically pleasing outcome.

Additionally, this preparation technique can improve the bonding strength of the composite material, as the fresh, unaltered enamel surface that is exposed typically means a better intimate contact with the bonding agents used. This results in a stronger, more durable restoration with less likelihood of failure over time due to issues related to bonding inadequacies. Overall, beveling optimizes the conditions necessary for successful adhesion in restorative dentistry.