Final answer:
The claim was likely denied due to the failure to obtain preauthorization for the dental crown procedure, despite having before and after photos.
Step-by-step explanation:
The student's question regarding why a claim was denied after providing dental care without prior authorization relates to the option of failure to obtain preauthorization. In medical and dental insurance policies, preauthorization is often required before performing certain procedures to ensure that the treatment proposed is covered under the patient's insurance plan. Regardless of the success of the procedure, or even the presence of before and after photos, without this preauthorization, insurance companies may deny claims. This is a common issue faced within healthcare professions, including dentistry, highlighting the importance of understanding and following insurance protocols.