Resto Flashcards
Ameloblasts have short extensions toward the dentinoenamel junction
Tomes process
Most mineralized and hardest substance of body
Enamel
Enamel is mainly composed of millions of
enamel rods or prisms
Series of grooves or fine ridges seen on
enamel surface where the striae emerge onto enamel surface
Perikymata groove striae of retzius
Brownish band. Growth circles. Similar to annual rings in tree
Striae of retzius
Formed from changes in diameter of tomes process
Striae of retzius
When retzius circle are incomplete;
Perikymata, pickerill lines
Enamel lamella özellik
Leaflike, found pits, contain organik mat
İmperfect calcification of enamel
Lamella
Types of lamella are seen
Type A poorly calcified rod segments
Type B degenerated cells
Type C after eruption where the crack is filled with mucoproteins
A minede B-C dentin
Used in forensic dentistry be used to distinguish matters such as
a child died before or after birth
Neonatal lines
Nasmyth memb diğer ad
Zamanla yerini ne alır
Primary enamel cuticle.
Pellicle = precurser to bacterial plaque
From dej to enamel
From enamel to dej
Enamel tufts
Enamel lamella
serve as pain receptors, explaining the enamel sensitivity
experienced by some patients during tooth preparation.
Enamel spindles
present mostly in cervical, incisal portion. This consists of bundles of enamel rods which interwine in an irregular manner, finally taking a twisted and
irregular path
Gnarled enamel =resistent to cutting
Compressive,tensile, yieşd strength kıyasla enamel dentin
Mine’nin tensili daha fazla denetinin compressivi
Odontoblasts long cytoplasmic processes
Tomes fibers
Dentinal tubules lateral branches
Microtubul and canaliculu
Odontoblasts pauses during dentine production and line occurs at that time=
Owen Line(von ebner fibers)
Odontoblasts durunca oluşan lines
If this lines extend perpendicular =
Extend parallel=
Owen von ebner
2.von corff fibers
less calcified areas remain between the spheres. This results in zones of hypomineralization= below mantle dentin
Czermak spaces= ınterglobular dentin
There is a zone adjacent to cementum, less calcified
Tomes Granular Layer cej den root apexine doğru artar
First formed dentin
Predentin
Unmineralized zone of dentin NeXT to odontoblasts
Predentin
Initial Shape of dentin
Primary dentin
Dentins that formed after root completion
Secondary and tertiary dentin
Dentin tubule numbers are. Higher in pulp than dej
Owen linenın enameldeki ismi
Ameloblasts pauses during enamel production and line ocuurs
Retzius line, striae of retzius
Czermak spaces (interglobular) enameldeki adı
Czermak s. Nerede bulunur
Lamella, tufts
Mantle dentinin altındaki circumpulpal dentinde
Interglobular is in crown
İf it is in root=
Tomes Granular Layer= adjacent to cementum,Less calcified
Cejden roota doğru miktarı artar
Dentin-predentin-odontoblast-cell poor Layer- cell rich Layer
Peritübüler dentin intertübülerden daha mineralzie
Intertubuler dentin determines the elasticity of dental matrix. Superficial-deep oran
In Superficial dentin =96 intertubuler 3 peritubular 1 water
Deep= 12inter 66 peri 22 water (hard to obtain proper adhesion)
İnitial mineralization of newly differentiated odontoblasts
Mantle dentin
Initial shape primary d. Primary dentin içinde mantle ve circumpulpal yer alır
0dontoblast process ler
ölmesi Sonucu tübüllerde
ara ara ölü alanlar gözükür=
dead tracts
Odontoblasts sayısı coronal dentinden root dentine gidildikçe azalır
Apekse doğru odontoblast sayısı azalır
Neden pulpa volumü yaşlandıkça azalır
Seconder dentin artışından
Odontoblasts mitoz yapmaz ,sensitivitye neden olur
Greatest number cells in pulp=
Fibroblast(cell rich Layer)
Kolajen ve ground substance salgılayan pulpadaki hücre nedir
Fibroblast
Which health status of cells show the age, vitality and strength of the pulp to
withstand irritant effects.
Fibroblast
Structureless Mass with gel like consistincy forming bulk of pulp=
Ground substance
Ground sub.ın içeriği.
Glycosaminoglycans, glycoproteins, water
Branches of nerves near to odontoblast Layer=
Raschknow plexus miyelin nöronlar miyelinini kaybedip oluşturur
Sadece molar dişlerde canal orifice görülür
Odontogenesis sırasında odontoblast uzantılarının(Tomes lifleri) mine-dentin sınırında sona ermeyip mine içine doğru kısa uzantılar şeklinde ilerlemelerinden ve kör olarak sonlanmalarından oluşurlar.; koyu renkli görünürler ve mine dokusu içinde kısa bir seyir takibeden ince yapılardır.
kavite açılması sırasında ağrı reseptörleri gibi fonksiyon görür
Spindle
İt belongs to growth lines in enamel known as striae of retzius
The cement thickens with the addition of new layers throughout life.
Premineralized noncalcified cementum
Cementoid
Calcified bodies in pdl or cementum
Cemenicles
as a result of calcification of the parts where the periodontal fibrils enter cement=
Sharp shape fibers olur nedenler
Excessive orthodonticforce
Occlusal pressure
Cementum is softer than dentin enamel. Apekste cement daha kalın
Cementum doesnt undergo reposition remodeling, only deposition
Cellular C.*Less calcified than cell-free cement
Cellular cem is thick and irregular
Junction between dentin and cement
İntermediate cement
In the crown, the cell bodies of odontoblasts
are columnar whereas in the midportion of
the pulp, they are more cuboid and in apical part, more flattened.
Pressure
Pulpa volume ü yaşlandıkça neden azalır
Due to increase in Secondary dentin deposition
Enamel is a brittle structure. It has LOW tensile strength HIGH elastic modulus bu da rigid olduğunu gösterir
Dentin has high compressive strength than enamel
. The diameter of rods increases from dentino-enamel junction
towards the outer surface of enamel in a ratio of 1: 2.
It contains greater concentration of enamel
Proteins
Enamel tufts
irregular enamel that is more resistant to cleavage called
Gnarled enamel
İnterrod substance between grups of enamel rods
Enamel tufts
hypermineralized zone of enamel
DEJ
During the development of a tooth, sound faulty coalescence of the lobes results in_____________?
Occlusal pit and fissures
Greater concenntration of enamel proteins . İnterrod substance. Spread of dental infection
Enamel tufts
Functions of Enamel
• It is hardest structure of tooth which supports masticatory forces
-It is responsible for color, esthetics, surface texture and translucency of the tooth
-It supports the underlying dentin and pulp.
Clinical Significance of Enamel Color:
Color of the enamel varies because of following factors:
Age
-antibiotic usage
Ingestion of fluoride
-Extrinsic stains
Developmental defects of tooth.
Hardness of dentin near dej three times greater than near the pulp. Dentin becomes harder with age, as a result of increases in mineral content.
Dentin is not as prone to cleavage as is the enamel rod structure.
Preperasyonds dentin enamelden nasıl ayrılır
Color reflectance hardnes ssound -cerrahsın
When moving an explorer tine over the tooth, enamel surfaces
provide higher-pitched sound than dentin. Because hardness of dentin is one-fifth that of enamel
Intertubular dentin determines the elasticity of the dental matrix.
Tomes granular layer increases from CEJ to root apex
Tertiary dentin özellikleri
Atubular,şrregular, mesenchymal cells produce odontoblast that produce reperative dentin, less permeable, for protecting pulp tissue
Functions of dentin
strength to the tooth
protection of pulp
* flexibility to the tooth
Color of enamel
-initiating pulpal defence mechanism
What is sclerotic dentin
It occurs due to aging(fizyolojik sd) or chronic and mild irritation (reaktif sd )
Peritubular dentin is wider,
This area harder less sensitive
Eburnated dentin:
It is type of reactive sclerotic dentin
-due to destruction by slow caries process or irritation and
-results in hard, darkened cleanable surface
Stellate retikulum:
Mine organını dolduran hücreler. Provide turgor and support to enamel.
Between stellate reticulum and inner enamel epithelium
Stratum intermedium
Epithelial band two processes=
vestibular lamina
dental lamina
