Podcast
Questions and Answers
What type of corrosion involves an unstable oxide surface that flakes off?
What type of corrosion involves an unstable oxide surface that flakes off?
- Dry corrosion (correct)
- Wet corrosion
- Concentration cell corrosion
- Galvanic corrosion
Which corrosion type is primarily associated with two dissimilar metals in contact?
Which corrosion type is primarily associated with two dissimilar metals in contact?
- Crevice corrosion
- Galvanic corrosion (correct)
- Dry corrosion
- Stress corrosion
What consequence of corrosion in the mouth can result from the release of metallic ions?
What consequence of corrosion in the mouth can result from the release of metallic ions?
- Improved mechanical properties
- Decrease in tissue discoloration
- Pain from galvanic effect (correct)
- Enhanced aesthetic appearance
What would be an effective method to eliminate crevice corrosion on dental restorations?
What would be an effective method to eliminate crevice corrosion on dental restorations?
Which characteristic of conventional dental amalgam allows it to reach full strength more quickly?
Which characteristic of conventional dental amalgam allows it to reach full strength more quickly?
Which of the following is NOT a consequence of corrosion in dental materials?
Which of the following is NOT a consequence of corrosion in dental materials?
Which statement accurately describes the maxillary second premolar compared to the maxillary first premolar?
Which statement accurately describes the maxillary second premolar compared to the maxillary first premolar?
What is true about the root structure of the mandibular first premolar?
What is true about the root structure of the mandibular first premolar?
Which developmental feature is characteristic of the maxillary second premolar?
Which developmental feature is characteristic of the maxillary second premolar?
How does the occlusal outline of the mandibular second premolar typically appear?
How does the occlusal outline of the mandibular second premolar typically appear?
What is a distinguishing feature of the maxillary first permanent molar?
What is a distinguishing feature of the maxillary first permanent molar?
What does the term 'transverse ridge' in the context of mandibular first premolar refer to?
What does the term 'transverse ridge' in the context of mandibular first premolar refer to?
Which of the following statements about the mandibular second premolar is correct?
Which of the following statements about the mandibular second premolar is correct?
What is notable about the distal aspect of the maxillary second premolar?
What is notable about the distal aspect of the maxillary second premolar?
What defines the primary function of the maxillary second premolar?
What defines the primary function of the maxillary second premolar?
Which of the following statements about the buccal aspect of the maxillary second molar is true?
Which of the following statements about the buccal aspect of the maxillary second molar is true?
Which cusp is the largest on the palatal aspect of the maxillary second molar?
Which cusp is the largest on the palatal aspect of the maxillary second molar?
What significant developmental milestone is associated with the first signs of calcification for the maxillary third molars?
What significant developmental milestone is associated with the first signs of calcification for the maxillary third molars?
How does the crown's appearance of the maxillary second molar compare to that of the first maxillary molar?
How does the crown's appearance of the maxillary second molar compare to that of the first maxillary molar?
What structural feature is commonly observed in the root system of the maxillary second molar?
What structural feature is commonly observed in the root system of the maxillary second molar?
What is a distinguishing feature of the mandibular first molar when comparing it to the maxillary molars?
What is a distinguishing feature of the mandibular first molar when comparing it to the maxillary molars?
Which aspect of the maxillary second molar is noted for having a more convex distal aspect compared to the mesial?
Which aspect of the maxillary second molar is noted for having a more convex distal aspect compared to the mesial?
At what age is the crown of the mandibular first molar typically completed?
At what age is the crown of the mandibular first molar typically completed?
What characteristic is distinct regarding the occlusal outline of the maxillary second molar?
What characteristic is distinct regarding the occlusal outline of the maxillary second molar?
Which characteristic of the md first molar contributes to its identification as likely the largest tooth in the dentition?
Which characteristic of the md first molar contributes to its identification as likely the largest tooth in the dentition?
What is the primary function of tubular reabsorption in the nephron?
What is the primary function of tubular reabsorption in the nephron?
Which segment of the nephron is primarily involved in the secretion of unwanted substances?
Which segment of the nephron is primarily involved in the secretion of unwanted substances?
Which of the following conditions would result from high levels of ADH?
Which of the following conditions would result from high levels of ADH?
What effect does low ADH levels have on urine?
What effect does low ADH levels have on urine?
What is osmolarity a measure of?
What is osmolarity a measure of?
Which hormone is key in regulating the permeability of the distal tubules and collecting ducts?
Which hormone is key in regulating the permeability of the distal tubules and collecting ducts?
What is the primary site for water reabsorption in the nephron when ADH is present?
What is the primary site for water reabsorption in the nephron when ADH is present?
How does the active reabsorption of NaCl in the nephron loop contribute to urine concentration?
How does the active reabsorption of NaCl in the nephron loop contribute to urine concentration?
What would be the urine volume produced during conditions of excess water intake with low ADH levels?
What would be the urine volume produced during conditions of excess water intake with low ADH levels?
What mechanism does ADH use to increase urine osmolarity?
What mechanism does ADH use to increase urine osmolarity?
What hormone is primarily responsible for controlling the reabsorption of sodium in the distal tubule?
What hormone is primarily responsible for controlling the reabsorption of sodium in the distal tubule?
Which component of the renin-angiotensin system directly cleaves angiotensin to produce angiotensin I?
Which component of the renin-angiotensin system directly cleaves angiotensin to produce angiotensin I?
High levels of aldosterone lead to which of the following actions?
High levels of aldosterone lead to which of the following actions?
What is the primary effect of angiotensin II in the proximal convoluted tubule?
What is the primary effect of angiotensin II in the proximal convoluted tubule?
In the brain, angiotensin II stimulates which of the following responses?
In the brain, angiotensin II stimulates which of the following responses?
What physiological effect does high ADH levels have on urine osmolarity?
What physiological effect does high ADH levels have on urine osmolarity?
Which of the following factors is NOT involved in long-term blood pressure elevation through the renin-angiotensin system?
Which of the following factors is NOT involved in long-term blood pressure elevation through the renin-angiotensin system?
Which is a correct relationship between sodium (Na+) and potassium (K+) levels in response to low aldosterone?
Which is a correct relationship between sodium (Na+) and potassium (K+) levels in response to low aldosterone?
What is the main impact of angiotensin II on arterioles?
What is the main impact of angiotensin II on arterioles?
How does the renin-angiotensin system respond to decreased arterial pressure?
How does the renin-angiotensin system respond to decreased arterial pressure?
Study Notes
Maxillary Second Premolar
- FDI: 15 and 25
- Very similar in appearance to the maxillary first premolar
- Presents with two cusps: buccal and palatal orientation, but most likely with only one root
- Complements the maxillary first premolar in function
- Rounder, less angular appearance
- Single root
- Stronger and heavier tooth
- Occlusally more wrinkled appearance
- May be congenitally missing
Mandibular First Premolar
- 4th tooth from the midline
- FDI: 34 and 44
- The smallest premolar
- First of the posterior mandibular teeth
- Two cusps: buccal and lingual (small, afunctional) and usually one root
- There is a transverse ridge that extends from the buccal cusp tip to the lingual cusp tip
Mandibular Second Premolar
- 5th tooth from the midline
- FDI: 35 and 45
- Larger than the first premolar and functions similarly to a molar
- Can present with 2 cusps: buccal and lingual or 3 cusps: 1 buccal and 2 lingual
- Usually single root
Maxillary First Permanent Molar
- First of the molar teeth
- FDI: 16 and 26
- Well developed occlusal surface with four well defined cusps
- Presents with three well developed large roots: palatal, mesio-buccal and disto-buccal
- Presents with 3 major cusps, 1 minor cusp and often 1 supplementary cusp: cusp of Carabelli
- Orientation: 2 buccal and 2 palatal
- Supplementary cusp, if present, is on the palatal surface of the mesiopalatal cusp (in about 60% of teeth)
Maxillary Second and Third Molars
- FDI: 17 and 27
- Slightly smaller than the 1st maxillary molar
- Shows similar features to the maxillary first molar
- Supplements the function of the maxillary first molar
- Shows more variation in form than the 1st maxillary molar and more supplementary grooves and pits
Maxillary Third Molar
- FDI: 18 and 28
- Complements the set of upper permanent molars in form and function
- If present may show a great range of variation in form
- Often impacted and displaced
- May be congenitally missing
- Display the greatest variation in form of all teeth
- Smaller than the second maxillary molar
- Roots are shorter than the second maxillary molar
- Roots are often fused
- Crown is smaller, often triangular or heart shaped
- Lots of supplementary grooves
Mandibular First Molar
- Shares the same traits as maxillary molars - largest in the arch
- FDI: 46 and 36
- Presents with five cusps and two roots
- Likely the largest tooth in the dentition
- Accessional
- 2 buccal and 2 lingual major cusps
- Two roots: mesial and distal orientation
- Roots inclined distally
- Crown height is smaller than that of the premolar but every other measurement is larger
Corrosion
- Types:
- Dry Corrosion
- Wet Corrosion
- Stress Corrosion
- Galvanic Corrosion
- Crevice Corrosion
- Concentration Cell Corrosion
- Materials:
- Metals: dry corrosion, wet corrosion
- Polymers: chain scission, absorption/adsorption, dissolution
- Ceramics: hydrolytic attack, dissolution
- Consequences:
- Pain due to galvanic effect
- Metallic taste due to the release of ions
- Deterioration in appearance and mechanical properties
- Increased body burden of metallic ions such as nickel and mercury
- Tissue discoloration of hard and soft tissue
- Elimination:
- Homogenising treatment of alloys eliminates the possibility of chemical corrosion in metals
- Finishing and polishing the surfaces of restoration can eliminate crevice corrosion
- Avoiding close contact between dissimilar metals in the mouth to avoid galvanic effects and corrosion
Conventional Dental Amalgam
-
Dimensional change of setting reaction
-
Comparison to lathe cut:
- Reach full strength more quickly
- Easier to carve and polish
- Lower mercury content
- Difficult condensation
- Creep: Y2 is responsible for high value of creep
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Description
This quiz covers the key characteristics and differences between maxillary and mandibular premolars. It includes details on cusp structure, root formation, and their functional roles in dental anatomy. Test your knowledge and understanding of these essential teeth!
