The Biological Factor of the Tooth

Biological tooth factor is a sign of tooth quality.

Criteria for evaluating the biological factor of the tooth
1. Clinical component
 * Condition of the suspension apparatus of the tooth,
 * mutual relationship of teeth and spaces,
 * own tooth position,
 * way of articulation,
 * tooth vitality,
 * size and shape of the crown of the tooth.

2. X-ray component
 * Degree of resorption alveolar process,
 * quality endodontic treatment,
 * the presence of periapical changes,
 * the length of the roots, their shape and strength.

Division of teeth according to biological factor - according to Voldřich

 * I. class: canines, first and second molars
 * II.class: upper central incisors, all premolars, third molars
 * III.class: upper lateral incisors, all lower incisors, all teeth with a bad biological factor

Division of teeth according to meaning within dentition

 * Teeth with a positive meaning
 * Absolutely necessary: They have the highest biological value, serve as class I pillars, have the longest prognosis.
 * Relatively Necessary: Serves as pillars II. and III. classes.


 * Teeth with a negative meaning
 * Absolutely negative: They worsen the biological factor of the dentition as a whole.
 * Relatively negative: Their presence threatens other teeth or causes traumatic articulation.

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