Which of these could potentially cause an internal void in a composite restoration?

An internal void in a composite restoration can arise from several factors, and in this case, both accidental contamination and improper layering technique contribute to the issue.

Accidental contamination can introduce unwanted substances into the composite material, such as saliva or blood, which can interfere with the bonding process. This contamination may prevent the composite from properly adhering to the tooth structure or to itself, leading to incomplete filling of the cavity and the formation of an internal void.

Improper layering technique also plays a critical role. When composite is not applied in thin, adequately cured layers, the material may not properly fill the entire cavity. If each layer is not adequately cured before the next layer is placed, this can prevent proper adhesion between layers. Additionally, if the composite is placed too thickly, it may exacerbate the chances of insufficient polymerization, trapping air bubbles and creating an internal void.

Understanding that both contamination and layering techniques are pivotal factors highlights the importance of meticulous technique and environmental control in the placement of composite restorations. This insight guides dental professionals in ensuring optimal outcomes in restorative dentistry.