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Related Concept Videos

Tooth Anatomy01:21

Tooth Anatomy

The human tooth enables us to eat a variety of foods, speak clearly, and even aid in shaping our faces. Teeth are composed of various elements that work together. Here's a detailed look at the anatomy of a human tooth.
The Crown, Neck, and Root
The visible part of the tooth is referred to as the crown. It's covered by enamel, the hardest substance in the human body. The crown is uniquely shaped for each type of tooth, allowing for different functions such as cutting, tearing, or grinding food.
Teeth01:15

Teeth

The formation of teeth, also known as odontogenesis, is a complex process that begins in utero, around the sixth week of embryonic development. There are three stages to this process: the bud stage, the cap stage, and the bell stage.
In the bud stage, the tooth germ (an aggregation of cells) starts to form in the developing jawbone. During the cap stage, the tooth germ differentiates into enamel organ, dental papilla, and dental sac, which will later develop into the tooth's enamel, dentin and...
Cranial Bones: Lateral View01:27

Cranial Bones: Lateral View

The lateral view of the cranium is dominated by temporal, sphenoid, and ethmoid bones.
The temporal bone forms the lower lateral side of the skull. The temporal bone is subdivided into several regions. The flattened upper portion is the squamous portion of the temporal bone. Below this area and projecting anteriorly is the zygomatic process of the temporal bone, which forms the posterior portion of the zygomatic arch. Posteriorly is the mastoid portion of the temporal bone. Projecting...
Oral Cavity01:11

Oral Cavity

The oral cavity, or the mouth, is a complex structure in humans that plays a vital role in our day-to-day lives. Its role is not only in chewing and swallowing food; it also plays a role in speech and facial expressions.
Teeth: The teeth are the hardest structures in our bodies. Humans have two sets of teeth throughout their lifetime: deciduous (baby) teeth and permanent teeth. Each tooth consists of several parts: the crown (visible part), the root (embedded in the jaw), enamel (hard outer...

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Related Experiment Video

Updated: May 30, 2026

The Establishment of a Murine Mandibular Molar Extraction Socket Healing Model
04:19

The Establishment of a Murine Mandibular Molar Extraction Socket Healing Model

Published on: January 13, 2023

Mandibular first molar with six separate canals.

Jeffrey L Ryan1, Walter R Bowles, Michael K Baisden

  • 1Department of Restorative Sciences, Division of Endodontics, University of Minnesota School of Dentistry, 8-166 Moos Tower, 515 Delaware Street SE, Minneapolis, MN 55455, USA. bowle001@umn.edu

Journal of Endodontics
|July 27, 2011
PubMed
Summary
This summary is machine-generated.

This case report details a mandibular first molar with six canals, successfully treated with conventional and rotary instruments. Long-term follow-up confirmed successful root canal treatment, highlighting the need for thorough canal exploration.

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The Establishment of a Murine Maxillary Orthodontic Model
04:11

The Establishment of a Murine Maxillary Orthodontic Model

Published on: October 27, 2023

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Last Updated: May 30, 2026

The Establishment of a Murine Mandibular Molar Extraction Socket Healing Model
04:19

The Establishment of a Murine Mandibular Molar Extraction Socket Healing Model

Published on: January 13, 2023

The Establishment of a Murine Maxillary Orthodontic Model
04:11

The Establishment of a Murine Maxillary Orthodontic Model

Published on: October 27, 2023

Area of Science:

  • Endodontics
  • Dental Anatomy

Background:

  • Mandibular first molars exhibit significant anatomical variations.
  • While typically having 3-4 canals, up to 6-7 have been documented.

Observation:

  • A case of a mandibular first molar presenting with six distinct root canals (3 mesial, 3 distal) is described.
  • Treatment involved instrumentation with traditional hand and rotary files.
  • Obturation was achieved using a hybrid warm vertical compaction technique.

Findings:

  • Post-treatment follow-up, including clinical examinations and radiographs up to 3 years, revealed no signs of sensitivity.
  • Radiographs demonstrated complete resolution of pre-existing apical periodontitis.

Implications:

  • This case underscores the critical importance of meticulously searching for accessory canals during root canal therapy.
  • Thorough exploration can lead to successful treatment outcomes even in complex anatomical presentations.