Embed Size (px)
Citation preview
DENTINADENTINA
DENTINADENTINA
COMPOSIÇÃOCOMPOSIÇÃO
COMPOSIÇÃOCOMPOSIÇÃO
Cristais de hidroxiapatita Carbonato, sulfatos Vestígios – F, Cu, Zn, Fe.
Cristais de hidroxiapatita Carbonato, sulfatos Vestígios – F, Cu, Zn, Fe.
COMPOSIÇÃOCOMPOSIÇÃO
PROPRIEDADES FÍSICAS PROPRIEDADES FÍSICAS
PROPRIEDADES FÍSICAS PROPRIEDADES FÍSICAS
PROPRIEDADES FÍSICAS PROPRIEDADES FÍSICAS
CARACTERÍSTICASCARACTERÍSTICAS
Avascular Prolongamentos dos odontoblastos Estrutura tubular
Avascular Prolongamentos dos odontoblastos Estrutura tubular
DENTINOGÊNESEDENTINOGÊNESE
DENTINOGÊNESEDENTINOGÊNESE
DENTINOGÊNESEDENTINOGÊNESE
Formação da matriz orgânica Formação da matriz orgânica
DENTINOGÊNESEDENTINOGÊNESE
Formação da dentina do manto Formação da dentina do manto
DENTINOGÊNESEDENTINOGÊNESE
Formação da dentina circumpulpar Formação da dentina circumpulpar
DENTINOGÊNESEDENTINOGÊNESE
Formação da dentina radicular
DENTINA PRIMÁRIADENTINA PRIMÁRIA
Dentina do manto Dentina do manto
DENTINA PRIMÁRIADENTINA PRIMÁRIA
Dentina circumpulpar Dentina circumpulpar
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
Duplo “S” ou dupla curvatura Duplo “S” ou dupla curvatura
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
TÚBULOS DENTINÁRIOSTÚBULOS DENTINÁRIOS
ESPAÇO PERIODONTOBLÁSTICO
ESPAÇO PERIODONTOBLÁSTICO
DENTINA INTRATUBULARDENTINA INTRATUBULAR
Dentina intratubular
Dentina intratubular
DENTINA INTERTUBULARDENTINA INTERTUBULAR
Dentina intertubular
Dentina intertubular
DENTINA INTERGLOBULAR
DENTINA INTERGLOBULAR
DENTINA SECUNDÁRIADENTINA SECUNDÁRIA
DENTINA ESCLERÓTICADENTINA ESCLERÓTICA
Dentina intratubular
Túbulos ocluidos Túbulos parcialmente ocluidos
DENTINA REPARADORA ou
REACIONAL
DENTINA REPARADORA ou
REACIONAL
DENTINA REPARADORA ou
REACIONAL
DENTINA REPARADORA ou
REACIONAL
Secundária
- Fisiológica
- Altera o volume mas não altera a forma
Secundária
- Fisiológica
- Altera o volume mas não altera a forma
Reparadora ou reacional
- Patológica
- Altera o volume e a forma da polpa
Reparadora ou reacional
- Patológica
- Altera o volume e a forma da polpa
DENTINA REPARADORA ou
REACIONAL
DENTINA REPARADORA ou
REACIONAL
VERSUS
DENTINA TERCIÁRIADENTINA TERCIÁRIA
PRÉ-DENTINAPRÉ-DENTINA
LINHAS INCREMENTAISLINHAS INCREMENTAIS
LINHAS INCREMENTAISLINHAS INCREMENTAIS
LINHAS INCREMENTAISLINHAS INCREMENTAIS
von Ebner
CAMADA GRANULOSA DE TOMES
CAMADA GRANULOSA DE TOMES
JUNÇÃO AMELODENTINÁRIA
JUNÇÃO AMELODENTINÁRIA
JUNÇÃO CEMENTODENTINÁRIA
JUNÇÃO CEMENTODENTINÁRIA
SENSIBILIDADE DENTINÁRIA
SENSIBILIDADE DENTINÁRIA
Fim
F I M
The peripheral layer of dentin, which is the first layer of dentin deposited, is called mantle dentin. It is located adjacent to the enamel in the crowns of teeth and adjacent to the cementum in the roots. Notice the lines of Retzius in the enamel which are oriented at an angle to the dentinoenamel junction. Unstained, 100x
The dentinal tubules scribe an S-shape pattern. Primary dentin occupies the major area of the photomicrograph. A demarcation line (located toward the left border of the frame) clearly delineates the primary dentin from the more irregular secondary dentin. A small section of enamel is visible at the right of the field. Unstained, 40x
Higher power of the previous image. Unstained, 100x
Higher power of image 17. Unstained, 100x
Reparative dentin is produced in response to irritation. It is a variation of dentin in which the dentinal tubules are more irregular and fewer in number than in primary or secondary dentin. The pulp is located to the left in the field. Unstained, 40x
Reparative dentin is produced in response to irritation. It is a variation of dentin in which the dentinal tubules are more irregular and fewer in number than in primary or secondary dentin. The pulp is located to the left in the field. (Higher magnification of image 20) Unstained, 100x
Another view of reparative (irregular) dentin. Unstained, 100x
Another view of irregular dentin, this time at a cusp tip. Unstained, 40x
Another view of irregular dentin, this time at a cusp tip. (Higher magnification of image 23) Unstained, 100x
Dentinal tubules. Unstained, 100x
Dentinal tubules. (Higher magnification of image 26) Unstained, 400x
Dentin stained with a silver stain. Silver Stain, 40x
Higher power of image 27. The dentinal tubules have lateral canaliculi which anastomose with those from adjacent tubules. The odontoblastic processes have lateral processes which extend into the canaliculi. Silver Stain, 200x
Higher power of image 28. The dentinal tubules have lateral canaliculi which anastomose with those from adjacent tubules. The odontoblastic processes have lateral processes which extend into the canaliculi. Silver Stain, 400x
The terminal ends of the dentinal tubules branch at the dentinocementum junction. Silver Stain, 400x
Identify dentin, predentin, odontoblasts and odontoblastic processes (Tomes' dentinal fibrillae). Silver Stain, 400x
Cross section of dentinal tubules. The cut ends of the odontoblastic processes are visible. Silver Stain, 400x
Cross section of dentinal tubules with odontoblastic processes. H&E, 400x
Notice the contour lines of Owen in dentin and the lines of Retzius in enamel. The two tissues are artifactitiously separated at the dentinoenamel junction. Unstained, 40x
The lines of von Ebner are oriented in the horizontal axis at approximately right angles to the dentinal tubules which run in the vertical axis. Unstained, 40x
The lines of von Ebner are oriented in the horizontal axis at approximately right angles to the dentinal tubules which run in the vertical axis. (Higher magnification of image 36) Unstained, 100x
Another view of the incremental lines of von Ebner. Unstained, 100x
Another view of the incremental lines of von Ebner. (Higher magnification of image 38) Unstained, 200x
The photomicrographs depict an occlusal area of a tooth with a brown central pit visible in frame 40. The regions of interglobular dentin appear as black spaces which are located in the crown of the tooth near the dentinoenamel junction. Notice that the dentinal tubules traverse the interglobular dentin. How is interglobular dentin formed? Unstained, 40x
The regions of interglobular dentin appear as black spaces which are located in the crown of the tooth near the dentinoenamel junction. Notice that the dentinal tubules traverse the interglobular dentin. How is interglobular dentin formed? (Higher magnification of image 40) Unstained, 200x
Tomes' granular layer appears as a black layer of granular structures which are located in the peripheral zone of root dentin adjacent to the cementum. Unstained, 100x
Higher power of image 42. Unstained, 200x
Groups of dentinal tubules which are filled with air appear black in ground sections of dentin when viewed with transmitted light. How are dead tracts formed? Unstained, 40x
During caries removal, carbide burs remove healthy dentin, exposing many dentinal tubules.
During caries removal, SS WHITE SMARTBURSTM instruments leave healthy dentin intact, exposing fewer dentinal tubules.
COLORAÇÃO POR TETRACICLINA
A. Junctional epithelium B. Contour lines of Owen C. [Dentogingival fibers of gingival lamina propria] D. [Dentoperiosteal fibers of gingival lamina propria] E. [Circular fibers of gingival lamina propria] F. [Alveolar crest fibers of periodontal ligament]
