# Tooth A (FDI 55): upper right primary second molar

> FDI tooth 55 is the upper right primary second molar (quadrant 5): Universal A, Palmer URE. With neighbouring teeth and the full chart.

Source: https://hajto.de/en/tooth-chart/tooth-55  
Last updated: 2026-10-17T11:13:49Z  
German version: https://hajto.de/zahnschema/zahn-55.md

- **FDI (ISO 3950):** 55
- **Universal (ADA):** A
- **Palmer:** E┘ (URE)
- **Name:** Upper right primary second molar
- **Tooth type:** Primary second molar
- **Group:** Posterior tooth
- **Quadrant:** Quadrant 5: upper right (maxillary right)
- **Dentition:** Primary dentition

## Neighbouring teeth

- [Tooth 54](https://hajto.de/en/tooth-chart/tooth-54.md): upper right primary first molar

## Opposing tooth (same position in the opposite jaw)

- [Tooth 85](https://hajto.de/en/tooth-chart/tooth-85.md): lower right primary second molar

[Interactive tooth chart](https://hajto.de/en/tooth-chart) · Reference for dentists and dental students. Notation according to the FDI two-digit system (ISO 3950) and the ADA Universal Numbering System.