CDT Occlusion & Articulation 1 — Questions and Answers
Question 1: How is centric occlusion defined in dental terminology?
- The position of maximum intercuspation of opposing teeth (Correct answer)
- The most retruded position of the mandibular condyles
- The position where condyles are seated in centric relation
- The position determined by the face-bow transfer
Correct answer: The position of maximum intercuspation of opposing teeth
Centric occlusion is the position of maximum intercuspation where opposing teeth fit together with the greatest number of tooth contacts.
Question 2: What is the primary purpose of a face-bow transfer in dental prosthetics?
- To record the patient's bite registration in wax
- To relate the maxillary cast to the hinge axis of the articulator (Correct answer)
- To measure the vertical dimension of occlusion
- To determine the incisal guidance angle
Correct answer: To relate the maxillary cast to the hinge axis of the articulator
A face-bow transfer records the spatial relationship of the maxillary arch to the temporomandibular joint hinge axis so the upper cast can be correctly mounted on the articulator.
Question 3: Which type of articulator is capable of replicating all three-dimensional mandibular movements?
- Simple hinge articulator
- Average value articulator
- Semi-adjustable articulator
- Fully adjustable articulator (Correct answer)
Correct answer: Fully adjustable articulator
A fully adjustable articulator can be programmed with individualized condylar settings obtained from pantographic records to replicate all mandibular movements.
Question 4: What is balanced occlusion as it applies to complete dentures?
- An equal number of tooth contacts on each side in centric only
- Simultaneous bilateral tooth contacts in centric and all eccentric positions (Correct answer)
- Contacts confined to the premolar region for stability
- Maximum intercuspation achieved only in centric occlusion
Correct answer: Simultaneous bilateral tooth contacts in centric and all eccentric positions
Balanced occlusion in complete dentures requires simultaneous bilateral tooth contacts in centric and all eccentric positions to stabilize the denture bases and prevent tipping.
Question 5: What is the accepted definition of centric relation?
- The position of maximum intercuspation of the teeth
- The musculoskeletally stable position of the condyles in the glenoid fossae (Correct answer)
- The most protruded position of the mandible
- The jaw position determined by muscle memory alone
Correct answer: The musculoskeletally stable position of the condyles in the glenoid fossae
Centric relation is the musculoskeletally stable position where the condyles are in the most superoanterior position against the articular eminences with the discs properly interposed.
Question 6: What is a protrusive interocclusal record primarily used to set on a semi-adjustable articulator?
- The Bennett angle for lateral movements
- The condylar inclination (sagittal condylar guidance) (Correct answer)
- The incisal guidance table angle
- The vertical dimension of occlusion
Correct answer: The condylar inclination (sagittal condylar guidance)
A protrusive interocclusal record is used to set the condylar inclination, which simulates the downward slope of the articular eminence guiding condylar movement.
Question 7: Which Angle's classification describes a normal molar relationship (Class I)?
- The mesiobuccal cusp of the upper first molar occludes mesial to the lower first molar buccal groove
- The mesiobuccal cusp of the upper first molar occludes in the buccal groove of the lower first molar (Correct answer)
- The mesiobuccal cusp of the upper first molar occludes distal to the lower first molar buccal groove
- The upper first molar is entirely lingual to the lower first molar
Correct answer: The mesiobuccal cusp of the upper first molar occludes in the buccal groove of the lower first molar
Angle's Class I is defined by the mesiobuccal cusp of the maxillary first molar occluding in the buccal groove of the mandibular first molar, representing the ideal molar relationship.
CDT Occlusion & Articulation 1
How is centric occlusion defined in dental terminology?