Articulators, Facebows, And More - Part 1 (Session 4)

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  • 1/24 Questions

    Which type of articulator do we students and most faculty use at UAB SOD?

    • Fully-adjustable
    • Semi-adjustable
    • Hinge-type
    • Non-adjustable
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About This Quiz

Explore the use of semi-adjustable articulators in dental education through this quiz. Understand the definition, applications, and limitations of articulators, including practical aspects like grinding on mounted casts and visualizing treatment goals in pre-waxing stages.

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  • 2. 

    An articulator is defined by which of the following features? (select all that apply)

    • Mechanical instrument representing the TMJ

    • Mechanical instrument representing the jaws

    • Maxillary and mandibular casts may be attached

    • Simulates all mandibular movements

    • Simulates some mandibular movements

    • Allows for diagnosis of TMJ problems

    Correct Answer(s)
    A. Mechanical instrument representing the TMJ
    A. Mechanical instrument representing the jaws
    A. Maxillary and mandibular casts may be attached
    A. Simulates all mandibular movements
    A. Simulates some mandibular movements
    Explanation
    An articulator is a mechanical instrument that is used in dentistry to simulate the movements of the temporomandibular joint (TMJ) and the jaws. It allows for the attachment of maxillary and mandibular casts, which are replicas of the patient's teeth and surrounding structures. The articulator is designed to accurately replicate all mandibular movements, including opening, closing, protrusion, and lateral movements. This allows dentists to diagnose and treat TMJ problems by analyzing the occlusion and bite relationship of the patient's teeth.

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  • 3. 

    Articulators are most effective when casts are mounted in MICP.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    If you mount casts in MICP, you cannot move condyles to a more superior-posterior position to properly evaluate patient contacts. Casts should be mounted in CR to allow the fullest range of movement to evaluate all contacts and slides.

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  • 4. 

    Advantages of mounted diagnostic casts include all of the following EXCEPT:

    • Visualizing pathologic tooth contacts

    • Reproducing mandibular movement and the resultant occlusal contacts

    • Visualizing musculoskeletal relationships caused by the dentition

    • Visualizing static and functional relationships of teeth

    Correct Answer
    A. Visualizing musculoskeletal relationships caused by the dentition
    Explanation
    Mounted diagnostic casts have several advantages in dentistry. They allow for visualizing pathologic tooth contacts, reproducing mandibular movement and occlusal contacts, as well as visualizing static and functional relationships of teeth. However, they do not provide a clear visualization of musculoskeletal relationships caused by the dentition. This means that while mounted diagnostic casts are useful for assessing tooth and occlusal relationships, they may not provide comprehensive information about the musculoskeletal system and its interactions with the dentition.

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  • 5. 

    Grinding on mounted casts may be part of developing a treatment plan when using articulators.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Grinding on mounted casts may be part of developing a treatment plan when using articulators. This means that when using articulators, it may be necessary to grind or adjust the mounted casts in order to develop an effective treatment plan. Grinding on mounted casts allows for precise adjustments and ensures that the treatment plan aligns with the patient's specific needs. Therefore, the statement is true.

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  • 6. 

    How may functional and esthetic diagnostic pre-waxing may be advantageous? (select all that apply)

    • Visualize the final treatment goal

    • Wax-ups may be adjusted to meet patient expectations

    • Visualize esthetic outcomes

    • Plan for fixed, removable, implant, and tissue-supported dental prostheses

    • Address unusual inter-dental spacing, occlusion, or tissue morphology

    • Foreshadow problems that may arise during course of therapy

    • Create wax tooth forms with normal function and occlusal stability to meet tx goals

    Correct Answer(s)
    A. Visualize the final treatment goal
    A. Wax-ups may be adjusted to meet patient expectations
    A. Visualize esthetic outcomes
    A. Plan for fixed, removable, implant, and tissue-supported dental prostheses
    A. Address unusual inter-dental spacing, occlusion, or tissue morphology
    A. Foreshadow problems that may arise during course of therapy
    A. Create wax tooth forms with normal function and occlusal stability to meet tx goals
    Explanation
    Functional and esthetic diagnostic pre-waxing can be advantageous in several ways. It allows the dentist to visualize the final treatment goal, which helps in planning and achieving the desired outcome. Wax-ups can be adjusted based on patient expectations, ensuring their satisfaction. It also helps in visualizing esthetic outcomes and planning for various types of dental prostheses. Additionally, it allows the dentist to address any unusual inter-dental spacing, occlusion, or tissue morphology, and anticipate any problems that may arise during the course of therapy. Finally, it helps in creating wax tooth forms that have normal function and occlusal stability, which is essential in meeting the treatment goals.

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  • 7. 

    Articulators may be employed in orthodontic treatment planning, especially extraction cases. The most common use of articulators is for diagnosis.

    • Both statements are true.

    • Both statements are false.

    • The first statement is true; the second is false.

    • The first statement is false; the second is true.

    Correct Answer
    A. The first statement is true; the second is false.
    Explanation
    2nd statement: most common use is for treatment

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  • 8. 

    Elastic ligatures used in ortho tx may be placed on hooks placed on diagonally-opposing teeth to generate forces.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Rubber bands are placed on hooks, while elastic ligatures (come in different colors) are the items placed around brackets to help hold the archwire in place.

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  • 9. 

    The articular eminence of the articulator should be on the upper member. The semi-adjustable WhipMix articulator is an ARCON type, meaning it has ARticulating CONdyles.

    • Both statements are true.

    • Both statements are false.

    • The first statement is true; the second is false.

    • The first statement is false; the second is true.

    Correct Answer
    A. Both statements are true.
    Explanation
    The first statement is true because the articular eminence of the articulator should indeed be on the upper member. This is necessary for proper articulation and movement of the lower member. The second statement is also true because the semi-adjustable WhipMix articulator is indeed an ARCON type, which means it has articulating condyles. This type of articulator allows for more accurate and realistic movement of the lower member in relation to the upper member. Therefore, both statements are true.

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  • 10. 

    Identify the applications of articulators in digital dentistry:

    • Combining technologies such as CBCT and digital impressions

    • Capturing eccentric records

    • Restoration design software

    • Positioning models accurately (digital facebow)

    • Replicating mechanical articulator shape and contours

    • Capturing MIP

    Correct Answer(s)
    A. Combining technologies such as CBCT and digital impressions
    A. Restoration design software
    A. Replicating mechanical articulator shape and contours
    A. Capturing MIP
    Explanation
    The application of articulators in digital dentistry is still lacking 1) accurately positioning models to replicate the patient (as in a facebow) and 2) capturing eccentric records.

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  • 11. 

    Non-adjustable articulators are the most prevalent type used by U.S. dentistry. Non-adjustable articulators may accurately reflect patient opening and closing pathways, but not accurately reflect patient lateral and protrusive excursions.

    • Both statements are true.

    • Both statements are false.

    • The first statement is true; the second is false.

    • The first statement is false; the second is true.

    Correct Answer
    A. The first statement is true; the second is false.
    Explanation
    2nd statment: Non-adjustable articulators do NOT reflect patient opening/closing pathways (arc is too small compared to pt) and do NOT reflect eccentric motions (cannot move left to right with these articulators).

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  • 12. 

    Because mounting with non-adjustable articulators is arbitrary, the use of interocclusal records enhances prosthesis outcomes for the patient.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    While mounting is arbitrary for non-adjustable articulars (usually in MICP), any interocclusal record which separates teeth will lead to increased error as mandible and articulator move on completely different paths.

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  • 13. 

    With a semi-adjustable articulator, it is possible to nearly match the patient in replicating occlusal contacts and eccentric motions. The most advantageous feature of semi-adjustable articulators is that they are roughly the size of the patient's anatomy.

    • Both statements are true.

    • Both statements are false.

    • The first statement is true; the second is false.

    • The first statement is false; the second is true.

    Correct Answer
    A. Both statements are true.
    Explanation
    The explanation for the given correct answer, "Both statements are true," is that the first statement states that with a semi-adjustable articulator, it is possible to nearly match the patient in replicating occlusal contacts and eccentric motions. This means that the articulator can accurately mimic the patient's natural jaw movements and occlusion. The second statement claims that the most advantageous feature of semi-adjustable articulators is that they are roughly the size of the patient's anatomy. This implies that the articulator is designed to closely resemble the patient's jaw structure and size, allowing for more accurate and realistic results. Both statements align with the advantages of using a semi-adjustable articulator.

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  • 14. 

    Select the 3 common adjustments for semi-adjustable articulators:

    • Condylar inclination

    • Lateral translation (Bennett angle)

    • Intercondylar distance

    • Maxillary width

    • Interdental spacing

    Correct Answer(s)
    A. Condylar inclination
    A. Lateral translation (Bennett angle)
    A. Intercondylar distance
    Explanation
    *Intercondylar distance is not a feature on our WhipMix 2240 articulators.

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  • 15. 

    Setting the condylar guidance to "FB" is necessary when mounting with the indirect system on a semi-adjustable articulator.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Setting the condylar guidance to "FB" is not necessary when mounting with the indirect system on a semi-adjustable articulator. The condylar guidance refers to the movement of the condyles in the temporomandibular joint, and "FB" stands for "functional bilateral." While it is a common setting for mounting models on a semi-adjustable articulator, it is not the only option. Other settings, such as "FD" (functional disclusion) or "CO" (centric occlusion), can also be used depending on the specific case and the dentist's preference. Therefore, the statement is false.

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  • 16. 

    In using the direct mounting technique with the WhipMix 2240 articulator, the brass peg on the upper member represents the auditory canal.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The brass peg on the upper member of the WhipMix 2240 articulator represents the auditory canal when using the direct mounting technique. This means that the position and orientation of the upper member can be adjusted to accurately mimic the movement of the patient's jaw. By aligning the brass peg with the auditory canal, the articulator can simulate the natural movement and function of the patient's temporomandibular joint. Therefore, the statement is true.

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  • 17. 

    Protrusive interocclusal records are used to set condylar guidance bilaterally while lateral interocclusal records are used to set condylar guidance unilaterally.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    Protrusive interocclusal records are used to set condylar guidance bilaterally, meaning they help establish the proper movement and position of the jaw joints on both sides of the mouth. On the other hand, lateral interocclusal records are used to set condylar guidance unilaterally, meaning they only focus on one side of the mouth. Therefore, the statement that protrusive interocclusal records are used to set condylar guidance bilaterally while lateral interocclusal records are used to set condylar guidance unilaterally is true.

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  • 18. 

    Lateral interocclusal records accurately capture immediate side shift within a 3-5mm laterotrusive excursion.

    • True

    • False

    Correct Answer
    A. False
    Explanation
    Because immediate side shift occurs in the first 1-2mm of motion, the lateral records (3-5mm of laterotrusive movement) do NOT truly capture immediate side shift.

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  • 19. 

    Measurements of laterotrusive condylar inclination are often greater (and therefore should be corrected) than those of protrusive condylar inclination.

    • True

    • False

    Correct Answer
    A. True
    Explanation
    The statement is true because laterotrusive condylar inclination refers to the movement of the jaw to the side, while protrusive condylar inclination refers to the movement of the jaw forward. In general, measurements of laterotrusive condylar inclination tend to be greater than those of protrusive condylar inclination. This is because the jaw has a greater range of motion when moving to the side compared to moving forward. Therefore, if measurements of laterotrusive condylar inclination are greater, they should be corrected to ensure proper alignment and function of the jaw.

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  • Current Version
  • Mar 20, 2023
    Quiz Edited by
    ProProfs Editorial Team
  • Dec 06, 2013
    Quiz Created by
    AngiG2013

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