**Question:** Connector's height for ceramic fixed partial dentures is

A. 2 mm
B. 1.5 mm
C. 1.0 mm
D. 1.2 mm

**Core Concept:** A ceramic fixed partial denture (FPD) is a dental prosthesis used to replace one or more missing teeth in a dental arch. It is typically made of ceramic materials and supported by adjacent teeth. A connector, also known as a pontic, is a critical component connecting the prosthesis to the abutment teeth.

**Why the Correct Answer is Right:** The correct answer is **D. 1.2 mm** because it represents the ideal connector's height for ceramic FPDs. A suitable connector's height ensures optimal stress distribution, maintains the tooth structure, and allows for proper tissue adaptation. A height of 1.2 mm allows for sufficient mechanical interlocking with the adjacent teeth, ensuring the prosthesis' stability and retention.

**Why Each Wrong Option is Incorrect:**

A. **2 mm (Option A)** is too high, potentially causing increased stress on the adjacent teeth and affecting their prognosis.
B. **1.5 mm (Option B)** may not provide sufficient mechanical interlocking with the abutment teeth, compromising the stability and retention of the prosthesis.
C. **1.0 mm (Option C)** is not sufficient, leading to inadequate retention and stability of the prosthesis.

**Clinical Pearl:** The connector's height in a ceramic fixed partial denture plays a crucial role in the prosthesis' stability, retention, and success. Choosing the correct height ensures optimal stress distribution, prevents excessive loading on adjacent teeth, and promotes long-term prognosis for both the prosthesis and the abutment teeth. Adequate mechanical interlocking with the abutment teeth is essential for a successful ceramic fixed partial denture.