A 7 year old female patient complains of multiple carious teeth and has the habit of frequent snacking, is fond of chocolates and does not brush twice daily. Intra-oral examination shows grossly carious deciduous mandibular molars and proximal caries with mandibular canines. Which type of finish line was used during the crown preparation in the restored tooth shown in the post-operative radiograph of this patient?

**Core Concept**
The question requires knowledge of dental anatomy, restorative dentistry, and the types of finish lines used in crown preparation. A finish line is an essential aspect of dental restoration, where the crown margin is prepared to ensure proper fit, function, and aesthetics.

**Why the Correct Answer is Right**
In this case, the patient has grossly carious deciduous mandibular molars and proximal caries with mandibular canines. Given the location of the caries and the type of restoration required, a **Cuspal-Bevel Finish Line** would be the most appropriate. This type of finish line involves removing a small portion of the cuspal anatomy to create a bevel, which helps to reduce the stress concentration on the restoration and improve its durability. The cuspal-bevel finish line is particularly useful in areas with high occlusal forces, such as molars.

**Why Each Wrong Option is Incorrect**
**Option A:** **Shoulder Finish Line** - This type of finish line is typically used in areas with minimal occlusal forces, such as anterior teeth. It would not be suitable for the molars in this patient.
**Option B:** **Chamfer Finish Line** - While a chamfer finish line is commonly used in crown preparations, it may not be the best choice for this patient's molars due to the high occlusal forces involved.
**Option C:** **Modified Oveglad-Ascuitto Finish Line** - This type of finish line is used in specific situations, such as in cases of severe tooth wear. It is not the most appropriate choice for this patient's carious molars.

**Clinical Pearl / High-Yield Fact**
When preparing a crown, it is essential to consider the type of finish line that will best support the restoration and minimize the risk of fracture. In areas with high occlusal forces, such as molars, a cuspal-bevel finish line is often the most suitable choice.

**Correct Answer:** C. Cuspal-Bevel Finish Line.

✓ Correct Answer: B. Feathered edge