Which of the following is NOT an issue caused by incorrect preparation?

The correct choice is related to the concept of tooth preparation in prosthetics dentistry. In the context of preparing a tooth for a restoration, ensuring that the preparation is done correctly is crucial for various factors that influence the success of the restoration.

The presence of optimum tooth height is not an issue caused by incorrect preparation. In fact, maintaining adequate tooth height is essential for achieving proper retention and resistance features, which are necessary for holding the restoration securely in place. An optimal height contributes positively to the preparation rather than detracting from it.

In contrast, improper preparation can indeed endanger the pulp if the removal of tooth structure is excessive or improperly angled, which may lead to pulp exposure or injury. Additionally, inadequate preparation can result in poor retention and resistance, compromising the stability of the restoration. Furthermore, a poorly designed finish line can lead to microleakage, allowing bacteria and fluids to seep in and potentially causing secondary caries and decay beneath the restoration.

Thus, the option regarding the presence of optimum tooth height stands out as the correct answer because it represents a desired outcome, not a complication of improper preparation.