# The Forgotten Triangular Space: Anatomy, Disease Mechanisms, and Contemporary Management of Interdental Embrasures—A Narrative Review

## TL;DR

This paper reviews the causes, effects, and treatment of open spaces between teeth, known as black triangles, and their impact on dental health and aesthetics.

## Contribution

The paper provides a contemporary narrative review on the anatomy, disease mechanisms, and management of interdental embrasures.

## Key findings

- Open embrasures result from periodontal disease, aging, and iatrogenic factors.
- Loss of papillary height affects aesthetics and increases plaque retention and inflammation.
- Reconstruction of interdental spaces is a growing focus in periodontal therapy.

## Abstract

The interdental papilla forms a critical component of the gingival complex, occupying the embrasure space between adjacent teeth and contributing to aesthetic harmony, phonetic integrity, and defense against food impaction and microbial colonization. Loss of papillary height, manifesting as open embrasures or "black triangles," arises from diverse etiologies, including periodontal disease progression, traumatic hygiene practices, divergent root angulations, aging-related tissue atrophy, and iatrogenic factors. This condition not only compromises smile aesthetics but also predisposes to plaque retention, root sensitivity, and localized inflammation. With increasing patient awareness of cosmetic outcomes, effective maintenance and reconstruction of embrasure spaces have gained prominence in periodontal therapy.