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Justi Lingual Bladed

Justi Lingual Bladed Teeth by Levin

Lingual bladed teeth with metal cross blades.Justi Lingual Bladed Teeth are crafted with esthetics in mind. They have highly functional metal blades that are barely visible. The cast metal cross blades that are on the lingual cusps of the maxillary second premolars and molars enable greater masticatory efficiency.

  • Justi Lingual Bladed Teeth.Provide maximum chewing efficiency plus the esthetics of natural teeth.
  • Are articulated to achieve bilateral balance in most clinical situations.
  • Can be used for lingualized occlusion or monoplane (flat teeth) occlusion.
  • Are manufactured with colour-stable, cross-linked acrylic resin, unbreakable cast chrome alloy blades, and in a variety of popular shades.

Artificial Teeth

Patients and dentists have been aware of the limitations of artificial teeth for a long time. In 1895, G. V. Black invented a gnathodynometer to measure a wide range of chewing forces for various types of food. These forces varied from 5 to 175 pounds. Black found that denture patients used chewing forces of only 20 to 30 pounds because of pain or fear of pain. Chewing tests found that artificial dentures were only one sixth as efficient as natural teeth.

The difference in efficiency between natural and artificial teeth is obvious. Natural teeth have crowns which are supported by roots, periodontal ligaments, and bony sockets. Artificial teeth are supported by a soft thin layer of oral mucosa that rests on a bony ridge, which cannot provide the sturdy support available to the natural teeth. Because of this difference, it is illogical to use the natural tooth forms for denture teeth.

Mechanical Teeth

After many disappointing experiences, various dentists abandoned the concept of the natural tooth form and designed mechanical tooth forms to improve chewing efficiency. Sosin was the first to design a mechanical tooth that had excellent function and could be set in bilateral balance. He designed a cross-blade of cast chrome alloy, placed on the maxillary denture.

Lingual Bladed Teeth

Levin was influenced by Sosin's design but was interested in teeth with better esthetics. He made the Sosin blades smaller and placed them on the mesio-lingual cusps of the first and second maxillary molars, and the lingual cusps of the second bicuspid. The teeth are anatomical in form and as such look natural and esthetic. The blades, which show very little or not at all when the patient is talking or smiling, are made of unbreakable cast chrome alloy.


Lingual Bladed Teeth
by Bernard Levin, D.D.S., M. Ed.,
Professor Emeritus, USC School of Dentistry
Download article in PDF (289 KB)

Lingual Bladed Teeth by Levin Manual
Download manual in PDF (3,077 KB)