HOSA Dental Terminology Practice

What does the shoulder preparation provide in relation to crown placement?

1. A junction of the crown and tooth

2. A smooth alveolar ridge

3. Aesthetic appeal

4. An undercut for fitting

The correct answer is: A junction of the crown and tooth

The shoulder preparation is a specific type of tooth preparation that creates a well-defined ledge or shoulder at the margin of the tooth. This preparation provides a junction between the crown and the tooth structure, allowing for an accurate and strong fit. The shoulder margin is crucial as it supports the crown and ensures that it sits securely on the tooth, thus preventing any potential for microleakage or bacterial invasion beneath the crown. This careful design also contributes to the overall retention of the crown, making it less likely to come loose over time. While aesthetics and smoothness of the alveolar ridge are important in dentistry, they are not the primary functions of the shoulder preparation. Similarly, an undercut is not created by a shoulder preparation; instead, it is designed to provide a clear and flat surface. Therefore, the correct answer highlights the critical role of the shoulder preparation in forming a reliable junction essential for the stability and longevity of the crown placement.