21819886
Description
Flashcards by Evian Chai, updated more than 1 year ago
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Created by Evian Chai
about 4 years ago
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| Question | Answer |
| Why is the dentine pulp complex called this? | Odontoblast processes extend at least 1/3 into dentine tubules from pulp |
| What are the functions of dental pulp? (4) | 1. Formation of dentine 2. Eruption of tooth/root formation 3. Dentine repair 4. Defence against infection |
| What is dentine? | The hard connective tissue that forms the bulk and form of tooth |
| What forms dentine? | Odontoblast cells in dental papilla |
| What is the function of dentine? | Determines shape of crown+number/size of roots |
| Rank the following in order of hardness from hardest to softest: 1. Enamel 2. Dentine 3. Bone/cementum | Enamel>Dentine>Bone/cementum |
| What is the composition of dentine? | 70% inorganic hydroxyapatite 20% organic (type 1 collagen+glycoproteins, proteoglycans, phosphoproteins) 10% H20 |
| What do the tubules in dentin come from? Where do they go? | Come from Dental Enamel Junction, goes to pulp |
| What are the two types of primary curvature tubules? Where are they located? | Straight and S shaped Straight are in the radicular region (more) S shaped are in the coronal region (less) |
| Canaliculi are... and are oriented in what way against the tubules? | lateral branches throughout dentin at 90 degree to tubule |
| Enamel spindles are | Tubules extending PAST EDJ into enamel |
| What is the function of peritubular/intratubular dentin? How does its composition differ from intertubular dentin? | Forms walls of all tubules but the ones near pulp 15% more mineralised (inter is 50% organic) Forms around same time as intertubular though |
| Which type of dentin is formed first? | Intertubular dentin |
| What does dental pulp contain (5)? What cells are present in the pulp (5)? | Contains cells, fibres, ground substance, blood vessels, nerves Cells are odontoblasts, stem cells/mesenchyme cells, fibroblasts, Schwann cells, defence cells |
| What fibers are in the pulp? | Type 1 collagen and type 3 collagen |
| What nerves are present in the pulp? | Sensory nerves Sympathetic nerves |
| What is pulpitis, and which factors can cause it (6)? | The inflammation of the pulp Caries, cracks, fractures, cavity preparation, dental materials, exposure of dentine |
| What is the mechanism of pulpitis? | 1. Inflammation of the pulp increases blood pressure 2. Vasodilation of arterioles in the pulp increase blood flow (causes redness) 3. Increased venous BP, lymph flow, osmotic pressure 4. Acute inflammation |
| What are the 5 indicators of inflammation? | 1. Rubor (redness) 2. Tumour (swelling) 3. Calor (increased temp) 4. Dolor (pain) 5. Loss of function |
| How do thermal tests test for pulpitis? | A lack of response/lingering pain indicates damaged nerves |
| How does an electric pulp tester test for pulpitis? | Response to EPT indicates viable nerve fibres |
| How does vital pulp therapy work? | A pulp cap is created using calcium hydroxide and covered with permanent restoration seal |
| What are treatments for pulpitis? | Vital pulp therapy Root canal treatment |
| What are other problems that can occur in the pulp? (4) | 1. Atresia (sclerosed canals from injury--> complete mineralisation) 2. Pupal stone (carious lesion in tertiary dentine leads to partial mineralisation) 3. Hyperaemia (pupal inflammation) 4. Pupal necrosis (bacteria infection) |
| How does pulp change in elderly patients? | Decreases in size More fibrous But can still form dentine/respond to stimuli |
| Which of the following has the greatest number of tubules? - Primary dentine - Secondary dentine - Tertiary dentine | Primary |
| What are von Ebner's lines? | Incremental lines in dentin |
| What are Andersen lines? | Retzius Lines in dentin |
| When does primary dentine stop? | Birth |
| How does secondary dentine differ from primary? | Dentine formation AFTER birth Tubular pattern are a little less regular Reduces pulp chamber size |
| What is translucent dentine? | Dentine tubules occluded with calcified material in response to external stimuli Mineral is different from that of peritubular dentine |
| What is the mineralisation front? | Rich in NCP - DPP - DSP - Proteoglycans Calcospherites and interglobular dentine |
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