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CEMENTUM
INTRODUCTION  Cementum is a specialised hard layer of calcified mesenchymal tissues which forms the outer covering of the anatomical root.   It is also called as  Substantia  Ossea   Cementum is the part of  Periodontium .  Human Cementum is avascular & has no innervation.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CHEMICAL PROPERTIES   Inorganic Matter (45-50%) Organic Matter (50-55%)    Mainly Hydroxyapatite     Mainly Type-I collagen Ca 10  (PO 4 ) 6   (OH) 2   & interfibrillar ground    Fluoride content is highest    Substance consist of  than other calcified tissues   Proteoglycans of body.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
DEFFERENCE ,[object Object],[object Object],1. First formed Secondary Cementum. 2. Present on cervical third or half of the root. Mainly on apical third of root. 3. It does not contain cells. It contain cells called cementocytes in individual spaces lacunae.  4. It is formed before the tooth reaches the occlusal plane. Formed after the tooth reaches the occlusal plane.  5. More calcified. Less Calcified. 6. Sharpey’s fibers are main compenent which inserted at approximately right angles onto the root surface. Sharpey’s fibers occupy smaller portion & occpy other fibers that are arranged parallel to the root surface.
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
  CEMENTOGENESIS : Cementum develops from the activity of mesenchymal cells of dental follicle after fragmentation of the epithelial root sheath. After formation of dentin, loss of continuity occurs in the epithelial root sheath. This allows adjacent cells of the investing layer of the dental follicle to come to lie on surface of root dentin & these are induced to differntiate into cementoblasts. CEMENTOENAMEL JUNCTION  : The interface between the Cementum & Enamel at the cervical region of tooth is known as cementoenamel junction.  It is of 3 types
Pattern I :   Pattern   Pattern III : Overlapping Type (60%) Butt joint (30%)   Gap joint (10%) CEMENTODENTINAL JUNCTION  It is interface between the dentin & cementum. Scalloped in deciduous teeth & smooth in the permanent teeth.  FUNCTIONS OF CEMENTUM :       Cementum provide a medium for the attachment to the collagen fibers of periodontal ligament.        Cementum is hard & has no blood supply, It does not show resorption under masticatory or orthodontic forces. Thus, during heavy orthodontic forces, tooth integrity is maintained & alveolar bone being elastic in nature changes its shape, fulfilling the orthodontic requirement.       Cementum has property of continuous deposition & does the patch work or repair for the damage such as fracture or resorption  of tooth surface.       Regular Cementum deposition at the root apex, helps to replenish the lost tooth height due to occlusal wear or helps in passive eruption of teeth.
[object Object],[object Object],Hypercementiosis Localized   Generalized    Cemental spikes &     Paget’s disease    Excementosis      Chronic periapical infection.    Non functional teeth without any antagonist.
[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]
[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],CEMENTAL REPAIR : Repair of cementum is a process to heal the damage caused by resorption or cemental fracture.    Repair   Anatomic Functional Root outline is re-established   In case of large cemental  as it was before cemental resorption.  resorption, repair does not re-establish the same anatomic contour as before.
AGING OF CEMENTUM :          Surface become rough.          Cemental Resorption.          Permeability Decreases.          More Cemental deposition may lead to closure of the apical foramen.   
  CLINICAL CONSIDERATION : I. Ankylosis :  Fusion of cementum & alveolar bone with no PDL in between, known as Ankylosis. Causes : Causes :        Faulty replantation & transplantation of teeth.       Embedded teeth.        Chronic Periapical Infection.       Trauma to deciduous teeth.  II.   Importance of Root Planing in Periodontal Treatment. Root planing is a treatment to remove necrotic cementum & smoothening the root surface in order to reduce the pocket depth

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cementum

  • 2. INTRODUCTION Cementum is a specialised hard layer of calcified mesenchymal tissues which forms the outer covering of the anatomical root. It is also called as Substantia Ossea Cementum is the part of Periodontium . Human Cementum is avascular & has no innervation.
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  • 7. CEMENTOGENESIS : Cementum develops from the activity of mesenchymal cells of dental follicle after fragmentation of the epithelial root sheath. After formation of dentin, loss of continuity occurs in the epithelial root sheath. This allows adjacent cells of the investing layer of the dental follicle to come to lie on surface of root dentin & these are induced to differntiate into cementoblasts. CEMENTOENAMEL JUNCTION : The interface between the Cementum & Enamel at the cervical region of tooth is known as cementoenamel junction. It is of 3 types
  • 8. Pattern I : Pattern Pattern III : Overlapping Type (60%) Butt joint (30%) Gap joint (10%) CEMENTODENTINAL JUNCTION It is interface between the dentin & cementum. Scalloped in deciduous teeth & smooth in the permanent teeth. FUNCTIONS OF CEMENTUM :      Cementum provide a medium for the attachment to the collagen fibers of periodontal ligament.      Cementum is hard & has no blood supply, It does not show resorption under masticatory or orthodontic forces. Thus, during heavy orthodontic forces, tooth integrity is maintained & alveolar bone being elastic in nature changes its shape, fulfilling the orthodontic requirement.      Cementum has property of continuous deposition & does the patch work or repair for the damage such as fracture or resorption of tooth surface.      Regular Cementum deposition at the root apex, helps to replenish the lost tooth height due to occlusal wear or helps in passive eruption of teeth.
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  • 13. AGING OF CEMENTUM :         Surface become rough.         Cemental Resorption.         Permeability Decreases.         More Cemental deposition may lead to closure of the apical foramen.  
  • 14. CLINICAL CONSIDERATION : I. Ankylosis : Fusion of cementum & alveolar bone with no PDL in between, known as Ankylosis. Causes : Causes :       Faulty replantation & transplantation of teeth.      Embedded teeth.      Chronic Periapical Infection.      Trauma to deciduous teeth. II. Importance of Root Planing in Periodontal Treatment. Root planing is a treatment to remove necrotic cementum & smoothening the root surface in order to reduce the pocket depth