Tooth neck
The tooth neck , technically cervix dentis , more rarely Collum dentis ( Latin feminine cervīx or neuter collum each for "neck", "neck" and Latin masculine dēns for "tooth") is the transition between the tooth crown and the tooth root . The tooth neck does not run as a straight line, but in a garland shape, where it is furthest towards the crown at the contact point with the neighboring tooth (approximal). This is more pronounced in the front teeth ( incisors and canines ) than in the molars . The enamel runs out in the neck area and is therefore thinnest here. In the direction of the root, the root cement forms the outer layer of the tooth.
The cement is not as strong and resistant as the tooth enamel. In healthy teeth, the neck of the tooth is covered by the gums. Due to diseases of the periodontium with regression of the height of the tooth socket margin ( limbus alveolaris ) and the resulting regression of the gums , the necks of the teeth can be exposed . Pressing the toothbrush too hard, horizontal brush movements and hard bristles promote this process. Exposed tooth necks are very sensitive to stimuli such as cold, heat, touch or sweet or sour foods. In addition, they are prone to tooth decay ( dental neck caries ). Wedge-shaped defects on the tooth neck have two triggering factors. They can occur as a result of overloading with bending stress and as a result of incorrect cleaning techniques.
Individual evidence
- ↑ a b Klaus M. Lehmann, Elmar Hellwig, Hans-Jürgen Wenz: Dental Propaedeutics: Introduction to Dentistry . Deutscher Ärzteverlag, 2012, ISBN 978-3-7691-3434-6 , p. 18 .
- ↑ Textbook of Dental Crown and Bridge Prosthetics: Volume II Bridge Prosthetics . Springer, 2013, ISBN 978-3-0348-7073-3 , pp. 75-76 .
- ^ Herbert F. Wolf, Edith M. Rateitschak, Klaus H. Rateitschak: Parodontologie . Georg Thieme, Stuttgart 2004, ISBN 978-3-13-655603-0 , p. 164 .
- ^ Jean-François Roulet: Prophylaxis and Preventive Dentistry . Georg Thieme, Stuttgart 2003, ISBN 978-3-13-135651-2 , p. 108 .