Occlusion: Diagnosis and Prognosis; Principles of Parallelism

Self-Study Examination

Instructions: After studying the text answer the following true/false or multiple choice questions.  Remember, there's only one answer to each question.

1. Tooth mobility can occur due to habits and/or deflective occlusal contact.

a) true
b) false

2. There is no distinction between senile alveolar atrophy and alveolar bone loss associated with more rapid periodontal disease.

a) true
b) false

3. A terminal mobile abutment should be avoided if possible. When there is no alternative, extra anterior splinting of firm abutments must be utilized.

a) true
b) false

4. The vertical overlap of the anterior teeth usually produces more torque on the alveolar bone of the maxillary arch than the mandibular arch.

a) true
b) false

5. The resultant line of force is not always perpendicular to the occlusal impact area.

a) true
b) false

6. A straight arch splint and a curved arch splint have the same effect on the supporting bone.

a) true
b) false

7. The axial inclination of a tooth is a critical factor in determining the biomechanical forces exerted on its alveolar support.

a) true
b) false

8. The resultant force on a splinted fixed prosthesis is the same if one tooth is in occlusion if all or of the teeth of the restoration are in occlusion.

a) true
b) false

9. The occlusal impact area of opposing cuspal inclines produces a resultant line of force that is perpendicular to the inclination of the occlusal impact area.

a) true
b) false

10. Vertical occlusal force on a straight arch splint results in a similar force distribution to the alveolar bone support as a curved arch splint.

a) true
b) false

11. The vertical overlap of the anterior teeth produces an occlusal relationship, which is called the incisal gui3ance. The incisal guidance, in combination with condylar guidance, influences all the posterior cusp inclines between these two extreme guidances

a) true
b) false

12. In a lower anterior curved arch splint, changes in the incisal guidance (impact area), have no effect on the distribution of force to the alveolar bone support.

a) true
b) false

13. Resultant torque on anterior upper and lower splinted fixed prostheses most often favors the lower arch.

a) true
b) false

14. When the lower posterior teeth are inclined mesially, due to a missing tooth, a multiple fixed prosthesis has a positive effect on the distribution of force to the alveolar bone support.

a) true
b) false

15. With the same degree of periodontal loss, the maxillary arch usually requires more extensive splinting than the mandibular arch.

a) true
b) false

16. A mandibular curved arch splint resists occlusal force better than a lower straight arch splint.

a) true
b) false

17. A mandibular curved arch splint resists occlusal force better than a similar maxillary curved arch splint.

a) true
b) false

18. In lateral eccentric movements, when the distal inclines of the lower teeth articulate with the mesial inclines of the upper teeth, the lower teeth will have a distal component of force exerted on them, while the upper teeth will have a mesial component of force.

a) true
b) false

19. If both mesial and distal inclines are in contact in lateral eccentric movements, the mesial and distal component forces tend to cancel each other by forming a vertical resultant force.

a) true
b) false

20. When a lower first molar is missing for a long time, the second and third molars incline anteriorly, which makes restorative procedures difficult.

a) true
b) false

21. If the third molar is not included in the restoration (above), reduction of the mesial enamel surface will not solve the interference in the path of insertion of the anterior restoration.

a) true
b) false

22. A telescope coping can be prepared on the second molar when the unprepared third molar mesial inclination interferes with the path of insertion of the anterior restoration. The mesial and distal surfaces of the telescope coping on the second molar are prepared parallel with the path of insertion of the restoration.

a) true
b) false

23. In the above restorative procedures, the telescope coping is cemented first, followed by the assembled anterior restoration.

a) true
b) false

24. In a large-scale curved upper restoration that includes the anterior and posterior teeth, the divergence of the axial inclination of the anterior and posterior teeth interferes one-piece cross arch splinting.

a) true
b) false

25. When the first bicuspid is present in a curved arch splint (Ant. & Post teeth), the divergence of the axial inclination of the teeth cannot be overcome.

a) true
b) false

26. If the first bicuspid is absent in a round arch splint, a telescope pontic is waxed up and cast with the adjacent canine abutment. A superstructure coping over the telescope coping is made part of the posterior restoration. Upon cementation, the divergence of the anterior and posterior axial inclinations of the abutments of a round arch splint is overcome.

a) true
b) false