Cementum is a specialized mineralized tissue that covers the outersurface of the tooth root. It is softer than enamel and dentin and playsa key role in attaching the tooth to the surrounding alveolar bonethrough the periodontal ligament.This tissue is produced by cells called cementoblasts and continues toform slowly throughout life. Cementum provides a surface for theattachment of periodontal ligament fibers, which help stabilize thetooth within its socket and allow it to withstand forces from chewing.There are different types of cementum, including acellular cementum,which is primarily involved in tooth attachment, and cellular cementum,which may play a role in adaptation and repair. Unlike enamel, cementumcan undergo limited repair and remodeling over time.
UnderstandingÂ
Cementum
Clinical Significance
Cementum is clinically important because it helps anchor the tooth and maintain its stability within the jaw. When exposed due to gum recession, it may be more sensitive and more susceptible to wear or decay compared to enamel. It is also relevant in periodontal disease, where loss of supporting structures can affect the cementum and its attachment to the periodontal ligament. Preservation of cementum is important in maintaining tooth support.
What it's Used For
Cementum provides attachment for the periodontal ligament, helping secure the tooth within the alveolar bone and distribute chewing forces.
Common Issues or Conditions
Exposure due to gum recession leading to sensitivity; Root caries affecting exposed cementum; Wear or abrasion of the root surface; Changes associated with periodontal disease; Calculus buildup adhering to the cementum surface
How It's Examined
Dentists evaluate cementum indirectly during clinical examination.They assess areas of root exposure, sensitivity, and surface texturenear the gumline.Dental instruments are used to detect roughness or calculus on the rootsurface. Radiographs may help assess surrounding bone and periodontalsupport, though cementum itself is not distinctly visible on standardX-rays.
Frequently Asked Questions
How is cementum different from enamel?
Cementum covers the root of the tooth and is softer, while enamel covers the crown and is the hardest tissue in the body.
Can cementum repair itself?
Cementum has limited ability to repair and can continue to form slowly over time, especially in response to normal function.
Why does exposed cementum feel sensitive?
When gum recession exposes the root, the underlying dentin may be affected, leading to sensitivity to temperature or touch.
Is cementum affected by cavities?
Yes, exposed cementum can be more vulnerable to root caries compared to enamel.
What role does cementum play in tooth stability?
It provides attachment for the periodontal ligament, which helps anchor the tooth securely in the jaw.