Human Teeth Model, Lower Molar with One Root

Quick Answer: The human teeth model, lower molar with one root, is a model of a mandibular molar shown with a single root rather than the usual two. This lower molar model is used in dental morphology to teach the molar crown, its cusps and pulp, and to discuss root variations such as fused roots.

A Molar with an Unusual Root

Lower first and second molars normally have two roots, one towards the front (mesial) and one towards the back (distal). A single-rooted lower molar is a recognised variation, seen most often in second and third molars, in which the roots are fused into one mass. Fused roots can hide unusual canal shapes; a well-known one is the C-shaped canal, more frequent in lower second molars and a known challenge in root canal treatment.

Above the root, the crown of a lower molar is broad and box-like with a grinding surface. The lower first molar typically has five cusps, three on the cheek side and two on the tongue side, separated by grooves, while the second molar typically has four. Pits and fissures on the chewing surface are where decay often starts, which is why children’s molars may be protected with fissure sealants.

The title says only that the molar has one root; which molar it represents, whether it is sectioned to show the pulp and canal, and its scale are not stated. Pairing it with a single-rooted incisor model helps students see how tooth shape follows function.

Care & Handling

• Store the lower molar model in a padded compartment so the cusps are not chipped.
• If the model is sectioned, keep both halves together and handle them by the outer surfaces.
• Wipe with a soft dry cloth; avoid solvents that may lift painted pulp or canal colours.

Specifications

Applications

• Dental morphology lessons on lower molar crown and root form
• Discussing fused roots and C-shaped canals in endodontics
• Explaining why molar fissures are prone to decay and how sealants help
• Biology lessons on the grinding function of molars

Why Choose LabEquip

Dental morphology teachers use single-tooth models like this to show variation as well as the textbook form. LabEquip lists it among its biology lab products with the incisor model for comparing tooth types; questions about which molar it represents can go through the contact page.

Frequently Asked Questions

Why would a lower molar have only one root?

Most single-rooted lower molars result from the two usual roots fusing during development. This is more common in second and third molars than in first molars, and it is seen more often in some populations than in others.

What is a C-shaped canal?

It is a root canal shaped like the letter C in cross-section, found where roots are fused. It joins what would normally be separate canals by a thin ribbon of space, which makes cleaning and filling the canal more difficult.

How many cusps does a lower molar have?

The lower first molar usually has five cusps: three on the cheek side and two on the tongue side. The lower second molar usually has four, arranged around a cross-shaped groove pattern.

Why do molars decay more often than front teeth?

Their chewing surfaces have deep pits and fissures where food and bacteria collect and toothbrush bristles cannot reach. They are also at the back of the mouth, where brushing is often rushed.

What are fissure sealants?

They are thin plastic coatings painted into the pits and fissures of molars, usually soon after the teeth erupt in children. They seal the grooves so plaque cannot settle there, lowering the risk of decay.

Why is root form important in tooth extraction?

Fused or conical roots are often easier to remove, while widely spread or curved roots anchor the tooth firmly and may need to be sectioned. Knowing the likely root form helps plan an extraction or root canal treatment.

Last Updated: September 2026