79 Questions
What is the primary objective of an interocclusal record?
To transfer the relation between the upper and lower dental arches to an articulator
Which factor does NOT influence the accuracy of an interocclusal record?
The shade of the recording material
According to Dawson's criteria, what is a requirement for accurate interocclusal records?
The recording material should cause minimal tooth movement
What is the purpose of mounting casts on an articulator using an accurate interocclusal record?
To allow the technician to create proper contours and alignment of the restoration
What is a potential consequence of failing to capture an accurate interocclusal record?
The need for remounting casts and possible refabrication of the prosthesis
Which of the following is NOT listed as a factor influencing the accuracy of an interocclusal record?
Patient's age
What is the purpose of an interocclusal record in relation to the articulator?
To transfer the patient's bite registration to the articulator
Which of the following materials can be used for making an interocclusal record?
All of the above
During lateral movement of the mandible in Unilateral Balanced Occlusion, where are the teeth in contact?
Only on the working side
Which type of occlusion maintains balanced and equal contacts throughout the entire arch during all mandibular excursions?
Bilateral Balanced Occlusion
In natural dentition, which type of occlusion is considered necessary for denture stability?
Bilateral Balanced Occlusion
Which type of occlusion involves teeth on the balancing side being free from any contact during lateral movement?
Unilateral Balanced Occlusion
What is the concept called when maxillary and mandibular teeth share and distribute forces during lateral mandibular movement in Unilateral Balanced Occlusion?
Group Function
In Bilateral Balanced Occlusion, where do simultaneous contacts occur during mandibular movements?
On both working and balancing sides
Which type of occlusion is characterized by rare presence in natural dentition but essential for denture stability?
Bilateral Balanced Occlusion
What distinguishes Unilateral Balanced Occlusion from Bilateral Balanced Occlusion in terms of contact during lateral movement?
'Teeth on the balancing side are free from any contact' in Unilateral vs. 'Simultaneous contact on both working and balancing sides' in Bilateral
What is the purpose of canine guided occlusion during lateral mandibular movements?
To cause disclusion of all posterior teeth on the working and balancing sides
In Class I occlusion, how do the maxillary and mandibular first permanent molars relate to each other?
The mesiobuccal cusps of the maxillary molar occlude with the mesiobuccal groove of the mandibular molar
What is the defining characteristic of Class II occlusion?
The mandibular first permanent molar is positioned posterior to the normal Class I position
What is the defining characteristic of Class III occlusion?
The mandibular first permanent molar is positioned anterior to the normal Class I position
What type of interocclusal record is taken when the teeth are in maximum intercuspation?
Centric intercuspal record
What type of interocclusal record is taken when the mandible is in its most retruded position?
Centric interocclusal record
In fixed prosthodontics, which interocclusal record is typically needed?
Centric interocclusal record
What is the abbreviation used for the maximum intercuspation position?
CO
What is the primary purpose of an articulator?
All of the above
Which of the following is NOT a use of an articulator?
To perform root canal treatment
Which type of articulator can only open and close in a fixed horizontal axis?
Non-adjustable articulator
Which type of articulator has adjustable condylar paths and incisal guide tables?
Semi-adjustable articulator
In an Arcon articulator, where is the condylar element (condylar spheres) attached?
Lower member
Which type of articulator resembles the temporomandibular joint (TMJ)?
Arcon articulator
What is the purpose of adjustable lateral condylar paths in a semi-adjustable articulator?
To simulate extreme lateral movements of the jaw
Which feature of a semi-adjustable articulator allows for simulating intra-border tooth movements?
All of the above
What is the tooth-to-tooth relation called when the mandible closes in centric relation?
Maximum Intercuspation (MI)
In what relation do the condyles need to be for Maximum Intercuspation to coincide with Centric Occlusion?
In centricity
What is the bone-to-bone relation between the maxilla and the mandible called?
Centric relation (CR)
Which type of occlusion is considered as an eccentric position when the condyles are out of centricity?
Habitual or physiological occlusion
What is referred to as the occlusion of teeth as the mandible closes in centric relation?
Centric Occlusion (CO)
When does Maximum Intercuspation not coincide with Centric Occlusion?
When condyles are out of centricity
What is the position referred to when low percentage of population have their maximum intercuspation coincide with Centric Occlusion?
Ideal occlusion
Impression plaster is commonly used as an ideal bite registration material due to its ease of manipulation.
False
Bite registration waxes have a high coefficient of thermal expansion and low resistance to closure.
False
Dimensionally inaccurate bite registration materials may interfere with active and passive movements.
True
Impression plaster modified with accelerators has a setting expansion that makes it ideal for bite registration purposes.
False
An accurate bite registration material should have adverse effects on oral tissues to ensure proper recording.
False
The accuracy of jaw relation records should only be checked on the casts, not in the mouth.
False
A rigid registration material before setting can help prevent displacement of teeth or mandible during closure.
True
Verifiability of records is not an important characteristic for an ideal bite registration material.
False
The mandibular movement can be broken down into translation and rotation components.
True
The mandibular movement is easier to understand when broken down into sagittal, horizontal, and vertical planes.
False
In the sagittal plane, the mandible can only perform translation movements.
False
Rotation in the horizontal plane occurs around several horizontal axes.
False
The initial hinging motion in the sagittal plane happens between the condyle and the temporal bone.
False
During translation in the sagittal plane, the lateral pterygoid muscle moves the condyle-disk assembly forward.
True
Mandibular movement in the frontal plane involves rotation around a horizontal axis.
True
The range of rotation in the sagittal plane is limited due to structures anterior to the zygomatic arch.
False
Zinc oxide eugenol paste is known for its high degree of flexibility after setting.
False
Acrylic resin is frequently used for single stop centric occlusion records because it is both accurate and rigid after setting.
True
Elastomers like Luxabite are difficult to manipulate and offer high resistance to closure.
False
Addition silicones among elastomers show high distortion during setting due to their polymerization reaction.
False
Zinc oxide eugenol paste has the disadvantage of not adhering well to carriers.
False
Acrylic resins are dimensionally stable due to minimal polymerization shrinkage.
False
Trimming flash around teeth is unnecessary when using zinc oxide eugenol paste for recording.
False
Elastomers like Luxabite are best known for their high errors and difficulty in trimming without distortion.
False
Recording material placed between teeth in this case often prevents casts from maximal intercuspation.
True
An interocclusal record is registered at a decreased OVD.
False
An interocclusal record is needed when a segmental restorative is planned and there are sufficient remaining teeth for hand articulation of the casts.
False
An interocclusal record is not required when a unilateral fixed partial denture involving terminal teeth is prepared.
False
Interocclusal record is captured before the construction of a bit rim when fixed partial denture planned for a patient involves missing posterior teeth and needs to restore the anterior teeth.
True
Artificial teeth are less compatible with mandibular movements compared to occlusion rims.
False
Interocclusal records are not influenced by the amount and equalization of pressure during the procedure.
False
Comfort of the patient has no impact on the stability and compatibility of record bases during interocclusal record procedures.
False
An interocclusal record with multiple points of references made by styli or cusp tips is more satisfactory than with occluding surfaces of wax or non-cusp form teeth.
True
The most widely used material to record the occlusal relation is blue base plate wax.
False
During the procedure of recording the occlusal relation, the patient is asked to mold the wax on the buccal area with his tongue.
False
In Dawson Technique, a Bimanual manipulation technique is used for recording centric relation.
True
The recording material should be placed over the area beyond the prepared teeth for an interocclusal record.
False
Elastomer is applied by softening it first and then asking the patient to bite on it directly without any guidance.
False
For an accurate interocclusal record, it is important to trim the excess material after it has completely set in the patient's mouth.
True
The purpose of mounting casts on an articulator using an accurate interocclusal record is mainly for aesthetic purposes.
False
Learn about the importance and objective of bite registration, which involves making an imprint of the positional relation of opposing teeth or jaws using materials like plaster of paris or acrylic resin. Understand how this technique helps transfer the relation between upper and lower dental arches from the patient's mouth to the articulator.
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