Microanatomy Test 4 pt. 2

aknight1302's version from 2015-11-17 16:39

Dentin (continued)

Question Answer
True or False: Dentin is a non-vital tissuefalse. DENTIN is a VITAL mineralized tissue
Is dentin tubule branching more extensive in the CROWN or in the ROOT?ROOT
Sheath of high-calcium dentin surrounding each tubuleIntratubular (Peritubular)
Dentin BETWEEN tubules is what type of dentin?INTERtubular Dentin
Which is harder, Intratubular Dentin or Intertubular Dentin?INTRATUBULAR
In terms of tertiary dentin, if the causing "insult" is MAJOR then the tertiary dentin is typically laid down by ____ cells, at what rate and how organized?Odontoblast-like cells, laid down very quickly, ad haphazardly
What are DEAD TRACTS?these are EMPTY dentin tubules, where the odontoblasts have died or tomes' processes have receded
What can be used to fill dentin tubules (in sclerotic dentin)?Intratubular Dentin or Calcium deposits (this is done WITHIN the Odontoblastic process, not a "dead tract")

Morphological features of Dentin and Enamel

Question Answer
What mineralized tissue cannot be studied after demineralization?enamel (must always STILL be MINERALIZED)
Incremental Lines of von Ebnervisible in decalcified dentin (correspond to periodic fluctuations in dentin deposition) (tree rings of dentin)
Exaggerated lines of von Ebner are called ____ ___ _________ ____ and are visible in mineralized specimenContour Lines of Owen
Interglobular dentin increase with what deficiency?Vitamin D deficiency
Interglobular dentin, areas without the formation ofIntratubular (peritubular) dentin, interlobular areas contain many odontoblastic processes
Tomes Granular layer, (where is it found and what is it? or reason for appearance)Found at Cemento-Dentin Junction, made up of numerous odontoblastic branching areas, believed to be involved in shock absorption and tooth sensation
This DEJ feature allows for greater attachment surface between enamel and dentinSCALLOPING
Bands on enamel slide that can be observed under REFLECTIVE light are caused by... (name and reason)Hunter-Schreger bands, caused by the alternating orientation of neighboring rod groups (second organizational level of enamel, adding greater structural integrity)
Hunter-Schreger bands can be seen on enamel under what conditions (how is slide lit)REFLECTIVE (this allows one to observe SURFACE qualities) cannot be demineralized
Bands on enamel slide that can be observed under TRANSMISSIVE light are cause by... (name and reason)Stria of Retzius, caused by changes in enamel being laid down... essentially tree-rings of enamel formation
Stria of Retzius can be seen on enamel under what conditions (how is slide lit)TRANSMISSIVE (light passing THROUGH the enamel sample) cannot be demineralized
Perykymatalines running laterally on the surface of a newly erupted tooth (associate with Stria of Retzius)
Where are ENAMEL TUFTS found and what are they?found at DEJ, hypo mineralized areas that are "flame-like" in appearance (believed to limit cracking of tooth, structural integrity)
Where are ENAMEL SPINDLES found and what are they?found at DEJ, remnants of odontoblastic processes that became embedded in initial enamel
Where are ENAMEL LAMELLA found and what are they?found running from DEJ to surface of tooth, hypo mineralized areas

Ducts and Salivary Glands

Question Answer
In broccoli metaphor for Salivary glands in ducts... what's analogous to what?Acini (Florets of broccoli), Excretory Duct (thickest stalks), Intercalated Duct (smaller stalks that come off thicker stalks)
Serous Acinilayer of secretory cells secrete Serous saliva
Mucous acinilayer of secretory cells secrete viscous saliva
Mucous Acini with DemilunesDemilunes produce SEROUS saliva to flush out thick Mucous saliva, found in sub-mandibular and sun-lingual
Major Salivary gland that produces Serous SalivaParotid Gland (STIMULATED SALIVA)
Stimulated salivaserous, mainly Parotid (but also Von Ebner)
What gland produces most of the stimulated saliva?Parotid Gland
What gland produces most of the serous saliva?Parotid Gland
What does the Submandibular gland produce?Mixed salivary production, both mucous and serous (unstimulated)
What type acini in Parotid gland?serous cells (have canaliculi)
Only MINOR Salivary Gland that produces SEROUS saliva? (name, location, function, stimulated/continuous?)Von Ebner's Gland, in the base around Circumvallate Papillae, this serous saliva is necessary for taste, it is stimulated
How many minor Salivary Glands in the mouth?600-1000
Origin of salivary glands?Epithelial intrusion into Mesenchyme (epithelial cord)
Dichotomous Branchingdevelopment of ducts and acini, (much like alveolar development)
When the sublingual salivary gland excretes through only one duct, this duct is called ____ ____Bartholin's duct
Bartholin's ductname for the single-opening secretory duct formation of Sublingual salivary duct formation/function (more commonly multiple secretory ducts/openings)

Oral Mucosa

Question Answer
Tissue type of Buccal Mucosa?NON-KER Strat Squam
What is in Sub Mucosa?MINOR SG's, fat, blood supply, nerve supply
What areas are keratinized in the mouth?????
Finger-like enfoldings of Lamina PropriaPapillae
How many taste buds in a human mouth?2,000-8,000
What are the only MINOR salivary glands to produce purely SEROUS saliva?Von Ebner's Glands (minor SG) in the base of the Circumvallate Papillae
Where are the Circumvallate Papillae?at the back of tongue against lingual tonsils
Filiform Papillae (description, location, function)"hair-like" keratinized strucures, cover most of the DORSAL surface of tongue, function in mastication and NOT TASTE
What 4 places are tastebuds found?Dorsal Tongue, Soft Palate, Epiglottis, Upper Esophagus
What are the 4 types of Papillae on the Dorsal Tongue?Filiform, Fungiform, Foliate and Circumvallate (3FC)
What type of neurons are in tastebuds?Bipolar neurons
Tissue type of Labial MucosaKERATINIZED Strat squam (none of the specialized skin structures that help it avoid drying out like sebaceous glands or hair, though) muchos vascularity and Sensation
Vermillion Bordertransition between Labial Mucosa and Skin of the face (surrounding lips) (problematic for cutting, scars unsightly)
Suckling Pad (tissue type, location, function)Para-Keratinized Strat Squam, in intermediate zone between labial mucosa and vermillion border of infants, induce oxytocin release in lactating mother
Suckling Pad induces what hormone release in mother?Oxytocin
What areas of the oral mucosa have NO minor salivary glands?Gingiva and Hard Palate (areas without any submucosa)

Patterns of Caries Spread

Enamel rods have different directions, depending on where you are in the crown...
Question Answer
PIT AND FISSURE, Enamel to DEJ, what shape? DEJ to pulp, what shape?diamond overall. point on tooth surface, broadest at DEJ then to point at pulp

Disease/Disorder/Symptoms -->

Question Answer
Ectodermal Dysplasiadental mainfestation: HYPODONTIA & DEFECTIVE ENAMEL (in formed teeth). -- Cause: problems with ectodermal tissues --> no tooth bud formation or defective enamel formation -- associated health problems, all tissues ectoderm ally derived... eyes, skin, etc.
Supernumerary Teethbelieved to be from excess islands of Dental Lamina that persisted and developed
Eruption Cystcyst surrounding tooth at eruption, NOT PROBLEMATIC, will resolve on its own... either poor communication between REE and Oral Epithelium or excess dental lamina remnants
Epithelial Rest of Malassezroots sheath remnants that persist, can eventually lead to problematic cyst formation
Dentogenesis Imperfecta Type 2pulp chamber is filled with defective dentin, autosomal dominant genetic defect
Bulimia NervosaChemical Erosion of enamel, due to frequent exposure to stomach acids and sugars
Fluorosisexcessive exposure to fluoride (soft, deformed, and discolored enamel) (this is caused during amelogenesis)
Hairy tongueHyperkeratosis of Filiform Papillae (not a problem), just a thing some people are unhappy with the appearance of
Sclerotic Dentinmineral deposits throughout dentin tubules, teeth are very brittle and look opalescent
Attritiontooth on tooth wear (habitual grinding)
Abfractionfracturing of enamel at base of crown (believed to be caused by excessive forces) (Elsalante disagrees)