In tooth numbering system 55 indicates
**Core Concept**
The tooth numbering system, also known as the FDI World Dental Federation notation, is an internationally accepted method of identifying teeth. This system uses a combination of numbers and letters to represent each tooth in a unique and standardized way.
**Why the Correct Answer is Right**
Tooth number 55 in the FDI World Dental Federation notation corresponds to the upper right second molar. The "5" represents the upper right quadrant, while the "5" again indicates the second molar position. This system is widely used in dentistry for accurate communication and record-keeping.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect as it does not correspond to the correct tooth number in the FDI World Dental Federation notation.
**Option B:** This option is also incorrect as it does not match the correct tooth number for the upper right second molar.
**Option C:** This option is incorrect as it is not a valid tooth number in the FDI World Dental Federation notation.
**Clinical Pearl / High-Yield Fact**
It's essential to remember that the FDI World Dental Federation notation is a widely accepted system used globally, and understanding this system can aid in accurate communication and record-keeping in dental practice.
**Correct Answer: D. Upper right second molar.**