Related Experiment Video
Updated: Aug 16, 2026
Experimental Model of Ligature-Induced Peri-Implantitis in Mice
Published on: May 17, 2024
Three cases of first permanent molar extractions where extraction of the adjacent second deciduous molar is also
Unlabelled:
Appropriately timed extraction of a carious first permanent molar can result in favourable mesial drift of the second permanent molar when space is not required for orthodontic treatment. However, when the second deciduous molar adjacent to the extracted tooth is not removed, distal drift of the unerupted second premolar may occur. This paper discusses three patients who had first permanent molars extracted without removal of the adjacent second deciduous molar, encouraging unfavourable distal drift of the second premolar in the first two cases. Timely extraction of the second deciduous molar in the third case should prevent this orthodontic problem.
Clinical Relevance:
Treatment of gross caries in a first permanent molar requires assessment of the patient's orthodontic status prior to treatment planning.
Related Concept Videos
01:15Teeth
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...
01:21Tooth Anatomy
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.