Articulators, Facebows, And More - Part 1 (Session 4)
Questions and Answers
- 1.
Which type of articulator do we students and most faculty use at UAB SOD?
- A.
Fully-adjustable
- B.
Semi-adjustable
- C.
Hinge-type
- D.
Non-adjustable
Correct Answer
B. Semi-adjustableExplanation
At UAB SOD, both students and most faculty members use a semi-adjustable articulator. This type of articulator allows for some adjustment and customization to simulate the movements and positions of the patient's jaw. It provides a good balance between flexibility and ease of use, making it suitable for dental education and clinical practice.Rate this question:
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- 2.
An articulator is defined by which of the following features? (select all that apply)
- A.
Mechanical instrument representing the TMJ
- B.
Mechanical instrument representing the jaws
- C.
Maxillary and mandibular casts may be attached
- D.
Simulates all mandibular movements
- E.
Simulates some mandibular movements
- F.
Allows for diagnosis of TMJ problems
Correct Answer(s)
A. Mechanical instrument representing the TMJ
B. Mechanical instrument representing the jaws
C. Maxillary and mandibular casts may be attached
D. Simulates all mandibular movements
E. Simulates some mandibular movementsExplanation
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.Rate this question:
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- 3.
Articulators are most effective when casts are mounted in MICP.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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- 4.
Advantages of mounted diagnostic casts include all of the following EXCEPT:
- A.
Visualizing pathologic tooth contacts
- B.
Reproducing mandibular movement and the resultant occlusal contacts
- C.
Visualizing musculoskeletal relationships caused by the dentition
- D.
Visualizing static and functional relationships of teeth
Correct Answer
C. Visualizing musculoskeletal relationships caused by the dentitionExplanation
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.Rate this question:
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- 5.
Grinding on mounted casts may be part of developing a treatment plan when using articulators.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 6.
How may functional and esthetic diagnostic pre-waxing may be advantageous? (select all that apply)
- A.
Visualize the final treatment goal
- B.
Wax-ups may be adjusted to meet patient expectations
- C.
Visualize esthetic outcomes
- D.
Plan for fixed, removable, implant, and tissue-supported dental prostheses
- E.
Address unusual inter-dental spacing, occlusion, or tissue morphology
- F.
Foreshadow problems that may arise during course of therapy
- G.
Create wax tooth forms with normal function and occlusal stability to meet tx goals
Correct Answer(s)
A. Visualize the final treatment goal
B. Wax-ups may be adjusted to meet patient expectations
C. Visualize esthetic outcomes
D. Plan for fixed, removable, implant, and tissue-supported dental prostheses
E. Address unusual inter-dental spacing, occlusion, or tissue morphology
F. Foreshadow problems that may arise during course of therapy
G. Create wax tooth forms with normal function and occlusal stability to meet tx goalsExplanation
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.Rate this question:
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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.
- A.
Both statements are true.
- B.
Both statements are false.
- C.
The first statement is true; the second is false.
- D.
The first statement is false; the second is true.
Correct Answer
C. The first statement is true; the second is false.Explanation
2nd statement: most common use is for treatmentRate this question:
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- 8.
Elastic ligatures used in ortho tx may be placed on hooks placed on diagonally-opposing teeth to generate forces.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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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.
- A.
Both statements are true.
- B.
Both statements are false.
- C.
The first statement is true; the second is false.
- D.
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.Rate this question:
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- 10.
Identify the applications of articulators in digital dentistry:
- A.
Combining technologies such as CBCT and digital impressions
- B.
Capturing eccentric records
- C.
Restoration design software
- D.
Positioning models accurately (digital facebow)
- E.
Replicating mechanical articulator shape and contours
- F.
Capturing MIP
Correct Answer(s)
A. Combining technologies such as CBCT and digital impressions
C. Restoration design software
E. Replicating mechanical articulator shape and contours
F. Capturing MIPExplanation
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.Rate this question:
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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.
- A.
Both statements are true.
- B.
Both statements are false.
- C.
The first statement is true; the second is false.
- D.
The first statement is false; the second is true.
Correct Answer
C. 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).Rate this question:
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- 12.
Because mounting with non-adjustable articulators is arbitrary, the use of interocclusal records enhances prosthesis outcomes for the patient.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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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.
- A.
Both statements are true.
- B.
Both statements are false.
- C.
The first statement is true; the second is false.
- D.
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.Rate this question:
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- 14.
Select the 3 common adjustments for semi-adjustable articulators:
- A.
Condylar inclination
- B.
Lateral translation (Bennett angle)
- C.
Intercondylar distance
- D.
Maxillary width
- E.
Interdental spacing
Correct Answer(s)
A. Condylar inclination
B. Lateral translation (Bennett angle)
C. Intercondylar distanceExplanation
*Intercondylar distance is not a feature on our WhipMix 2240 articulators.Rate this question:
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- 15.
Setting the condylar guidance to "FB" is necessary when mounting with the indirect system on a semi-adjustable articulator.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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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.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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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.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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- 18.
Lateral interocclusal records accurately capture immediate side shift within a 3-5mm laterotrusive excursion.
- A.
True
- B.
False
Correct Answer
B. FalseExplanation
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.Rate this question:
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- 19.
Measurements of laterotrusive condylar inclination are often greater (and therefore should be corrected) than those of protrusive condylar inclination.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
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.Rate this question:
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