Review

Eruption times:

Max. 1st premolars- 10-11yrs

Max. 2nd premolars- 10-11yrs

Mand. 1st premolars- 10-12yrs

Mand. 2nd premolars- 11-12yrs

Numbering:

Max. 1st premolars- 5 and 12

Max. 2nd premolars- 4 and 13

Mand. 1st premolars- 21 and 28

Mand. 2nd premolars- 20 and 29

Class review questions

1. T/F: Tooth #20 is more symmetrical than tooth #21.

   Answer: True

2. T/F: The mandibular first premolars can have up to three cusps.

   False- only mandibular 2nds can

3. Differentiate between the characteristics of the mandibular and maxillary premolars

   • True or False: A transverse ridge is present on all mandibular and maxillary premolars

     • Answer: false; the transverse ridge is not present on the mandibular second premolar.

4. Locate the ridge, grooves, fossa, and pits present on the occlusal surface of maxillary premolars

   • Which of the following is not a groove present on the maxillary second premolar?

   a. Central groove

   b. Mesial marginal groove

   c. Mesiobuccal groove

   d. Distobuccal groove

5. Differentiate between the mandibular first and second premolar.

   • T or F: The mandibular first premolar has a shorter blunt buccal cusp compared to the mandibular second premolar.

     • Answer: False, the mandibular second premolar has a shorter buccal cusp

   • T or F: The mandibular first premolar has a shorter proximal root concavity.

     • Answer: True

6. On the occlusal surfaces, which teeth are more symmetrical?

   a. maxillary first premolars

   b. maxillary second premolars

   c. mandibular first premolars

   d. mandibular second premolars

   e. maxillary and mandibular second premolars

7. True/False: maxillary second premolars can be bifurcated?

8. Only first max. Premolar

9. What elevation is found on the buccal surface of both maxillary pre-molars and maxillary canines but is not found on maxillary incisors?

   A.) Mesial marginal ridge

   B.) Lingual ridge

   C.) Occlusal ridge

   D.) Buccal ridge

10. Which of the following statements is true:

    A.) Premolars and anterior teeth are succedaneous

    B.) Premolars are non-succedaneous

    C.) Anterior teeth are non-succedaneous

    D.) Both B and C

11. T/F: The mandibular second premolar typically has a larger lingual cusp than the mandibular first premolar.

12. Objective: Reminder that the first premolar is the only mandibular premolar with a the mesiolingual developmental groove.

    • Which of the following is true about the mandibular first and second premolars?

    A. The mandibular first premolar has two lingual cusps, while the second premolar usually has only one.

    B. The mandibular second premolar generally has a larger overall size compared to the mandibular first premolar.

    C. The mandibular first premolar has a pronounced mesiolingual developmental groove, which is often absent in the second premolar.

    D. Both B and C are correct.

13. 1. Which pre molars erupt first?

    a. Mandibular first premolars

    b. Maxillary first premolars

    c. Mandibular second premolars

    d. Maxillary second premolars

    c. Both A & B

    d. Both B & D

14. Four lobes are present with both maxillary premolars and anterior teeth. T/F

15. Which cusp is usually the largest on a mandibular second premolar with three cusps?

    a. mesiolingual cusp b. distolingual c. buccal cusp d. central cusp

16. True or Flase; The most common occlusal pattern of the mandibular second premolar with three cusps is the H-pattern?

    (False, it is the Y-pattern)

17. Differentiate between the mandibular first and second premolar.

    • T/F: all mandibular premolars have a mesiolingual groove?

18. Describe the occlusal surface of the maxillary premolars in terms of dimensions.

    • T/F: the maxillary 2nd premolar is more symmetrical than the maxillary 1st premolar?

19. T/F-The mesial concavity is found on the crowns of the maxillary premolars. (There is only a mesial concavity on the crown of the 1st maxillary premolar, not the second.)

20. T/F- ALL contact areas for the premolars, maxillary and mandibular, are located at the middle third. ( the contact areas vary, mandibular first and second in the occlusal to middle third, maxillary first and second in the middle third.)

21. Q. When do the mandibular 1st premolars erupt?

    a. 9-10 years

    b. 10-11 years

    c. 10-12 years

    d. 11-10 years

22. Q. What is the number for the 2nd mandibular premolar on the left?

    a. #29

    b. #20

    c. #21

    d. #28

23. T/F: The first mandibular premolar and second mandibular premolar contain a mesial, central, and distal occlusal fossa.

    True

    False

    • Answer: False (the first mandibular premolar only contains a distal and mesial occlusal fossa, the second mandibular premolar contains all 3 of the above listed occlusal fossa)

24. Which tooth numbers consist of a sharper and steeper buccal cusp?

    A. #20, #29

    B. #21, #28

    C. #21, #29

    D. #20, #28

25. Which premolars have a mesial concavity?

    Answer: First premolars on the maxillary.

26. What patterns can a mandibular second premolar have?

    Answer. Y pattern, H pattern, and/or U pattern.

27. Will a person have the first and second mandibular premolars erupt at age 10? False (only first premolar erupts at age 10)

28. Can there be more than one lingual cusp present on the second mandibular premolar?

    A. No, there is only one lingual cusp

    B. There is no lingual cusp

    C. Yes, there can be two

29. T/F - The buccal cusp on the maxillary first premolar is duller than the maxillary second premolar.

30. T/F - The maxillary first premolar may be bifurcated buccal and lingual.

31. T/F: There are two cusps on all premolars

32. T/F: The second premolar is more symmetrical than the first premolar