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DH110 ORAL HISTOLOGY AND EMBRYOLOGY Lesson 9 Tammy Fisher RDH
BS Salivary Glands, Tonsils and Biofilm
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ROLL CALL Will you give me a constructive comment about this
class?
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Lets Get Started Lesson 9 Objectives Dont forget the Smile
Train donations! Homework #4 graded and returned last week Homework
#5 part #3 returned Homework #5 part 4 due next week after
final
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Quiz 4 Review Chapters 11-14 Periodontal Ligament Alveolar
Process and Cementum Tempomandibular Joint Oral Mucosa
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Acquired Pellicle (Non- mineralized) A tenacious membranous
layer that is amorphous, acellular, and organic. Composed primarily
of glycoproteins from saliva absorbed by the hydroxyapatite of the
tooth surface. Forms over exposed tooth surfaces, as well as over
restorations & dental calculus. Formed within minutes after
removal.
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Soft Deposits Acquired pellicle or cuticle, dental biofilm,
materia alba, and food debris, each of which is an entity.
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Microbial biofilm (Non- mineralized) Dense, organized bacterial
systems embedded in an intermicrobial matrix that adhere closely to
the teeth, calculus, and other surfaces in the oral cavity. * not
easily removed with water irrigation
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Materia alba (Non- mineralized) Loosely adherent, unstructured,
white or grayish-white or cream-colored cheesy mass of oral debris
& bacteria that lies over dental biofilm. *Can be removed with
vigorous rinsing & water irrigation
Calculus (Mineralized) Calcified dental biofilm; hard,
tenacious mass that forms on the clinical crowns of the natural
teeth & on dentures & other appliances. (biofilm
mineralization)
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Significance of pellicle 1. Protection - barrier against acids
2. Lubrication - keeps surface moist 3. Nidus for bacteria - aiding
the adherence 4. Attachment of calculus - like double stick
tape
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Stages in the formation of biofilm Formed in three basic steps:
1. Pellicle formation 2. Bacterial multiplication &
colonization 3. Biofilm maturation (matrix formation)
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GREAT BOOKS
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NEXT WEEK The Final!! Journal Review Presentations