Dental Occlusion Assessment Quiz
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Questions and Answers

What should be observed during the occlusal check-up to assess normal contacts in maximum intercuspation?

  • Uneven jaw movement while biting
  • Continuous clenching throughout the bite
  • Presence of large oval areas of contact
  • Intensity of pin-point size contacts (correct)

What is the primary role of articulating film during an occlusal check-up?

  • To record bite contacts (correct)
  • To stimulate tooth sensitivity
  • To assess dental hygiene
  • To measure jaw alignment

Which of the following statements about abnormal harmful contacts in maximum intercuspation is correct?

  • They usually occur only on anterior teeth.
  • They can result in localized wear of teeth. (correct)
  • They are typically smaller than normal contacts.
  • They present no challenge to healthy occlusion.

How should the occlusal contacts be registered on the patient?

<p>By asking the patient to tap lightly during occlusion (B)</p> Signup and view all the answers

Which area is NOT checked during the occlusal contact assessment?

<p>Patient's maxillary sinus (A)</p> Signup and view all the answers

What is the primary effect of an excessive curve of Spee on muscle balance?

<p>It alters muscle imbalance. (B)</p> Signup and view all the answers

In the context of the Curve of Wilson, how is the curve characterized in the maxillary arch?

<p>Convex (D)</p> Signup and view all the answers

What defines the posterior plane of occlusion?

<p>It is located midway between the cusp tips of mandibular molars. (A)</p> Signup and view all the answers

How can the posterior plane of occlusion be affected?

<p>Through growth, orthodontics, and dentistry. (B)</p> Signup and view all the answers

What happens to maxillary molars when attempting to move them buccally using orthodontic tray aligners?

<p>They tip, changing the Curve of Wilson. (C)</p> Signup and view all the answers

What should be used to identify heavier centric contacts?

<p>Thin double-sided articulating paper (D)</p> Signup and view all the answers

Which factor is important to consider for the visibility of red articulating paper on dental restorations?

<p>The color of the dental material (C)</p> Signup and view all the answers

What distinguishes static contacts in occlusion analysis?

<p>They are point contacts. (D)</p> Signup and view all the answers

What is the preferred thickness of articulating paper for optimal results?

<p>20 microns (C)</p> Signup and view all the answers

What condition might necessitate using multiple sheets of articulating paper during adjustments?

<p>Extensive occlusal adjustments (B)</p> Signup and view all the answers

What is one benefit of using 20-micron articulating paper over thicker options?

<p>More accurate results (C)</p> Signup and view all the answers

To assess the occlusal scheme, which element is NOT taken into account?

<p>Dynamic bite force (C)</p> Signup and view all the answers

What is one characteristic of articulating paper that affects occlusion registration accuracy?

<p>Thickness can alter results. (D)</p> Signup and view all the answers

What role do posterior teeth play in relation to anterior teeth during occlusion?

<p>They protect anterior teeth from shear forces. (C)</p> Signup and view all the answers

What happens when posterior teeth are missing?

<p>It causes occlusal overload on anterior teeth. (C)</p> Signup and view all the answers

What is the effect of moving more posteriorly in the masticatory system?

<p>The occlusal tables get larger. (C)</p> Signup and view all the answers

During the closing movement, what is observed in the maxillary and mandibular teeth?

<p>Simultaneous contact of both sets of teeth supports the occlusal load. (C)</p> Signup and view all the answers

What is the fulcrum in the masticatory system according to the Class III lever model?

<p>TMJ (A)</p> Signup and view all the answers

Why is maintaining occlusal contacts on posterior teeth important?

<p>They increase the overall strength of occlusion. (D)</p> Signup and view all the answers

Where is the centric contact located on the maxillary central incisor?

<p>On the mesial marginal ridge (lingual surface) (B)</p> Signup and view all the answers

Which statement about posterior occlusion is true?

<p>Not all cusps have the same function. (D)</p> Signup and view all the answers

Which treatment option is considered more invasive for correcting an inverted anterior occlusal plane?

<p>Cosmetic dentistry using ceramics or composite resins (D)</p> Signup and view all the answers

What is the curve of Spee defined as?

<p>A line that starts with the cusp tip of the mandibular canine (D)</p> Signup and view all the answers

What can excessive curve of Spee lead to?

<p>Over-eruption of lower incisors (C)</p> Signup and view all the answers

What is the primary role of lateral guidance in dental occlusion?

<p>To influence mandibular movement (D)</p> Signup and view all the answers

Which anatomical structure does the curve of Spee end at?

<p>Anterior aspect of the mandibular condyle (A)</p> Signup and view all the answers

Which treatment would be considered more conservative for the correction of an inverted anterior occlusal plane?

<p>Orthodontia (B)</p> Signup and view all the answers

What negative impact can an imbalance between anterior and posterior occlusal forces have?

<p>Over-eruption of the lower incisors (D)</p> Signup and view all the answers

What is generally used to correct a canted smile apart from dental restorations?

<p>Botox injection to relax muscle pull (A)</p> Signup and view all the answers

What is the ideal number of contacts on the occlusal table in the 'Cusp To Flat Surface' contact scheme?

<p>2 contacts on functional cusp, 1 on non-functional cusp, and 1 on marginal ridge (D)</p> Signup and view all the answers

What type of contact should be avoided on the cusp tip?

<p>Heavy contacts (D)</p> Signup and view all the answers

Which of the following describes Axial Loading in the context of occlusal contacts?

<p>Forces perpendicular to the long axis of the tooth (D)</p> Signup and view all the answers

What is a detrimental contact that should be identified in occlusal analysis?

<p>Excessive number of contacts (D)</p> Signup and view all the answers

In the 'Cusp To Flat Surface' contact scheme, which contact type is emphasized as necessary for stability?

<p>Light contact on the marginal ridge (A)</p> Signup and view all the answers

Which occlusal contact scheme allows for ideal contact with 1 contact on the non-functional cusp and additional contacts on functional cusps?

<p>Cusp To Flat Surface (C)</p> Signup and view all the answers

What happens if a contact is lost during the fabrication of a restoration?

<p>Remaining forces can still provide necessary stability (A)</p> Signup and view all the answers

What is the primary goal when assessing occlusal contacts?

<p>To identify contacts that are excessive or in inappropriate areas (D)</p> Signup and view all the answers

Flashcards

Anterior Occlusal Plane

The alignment of the upper front teeth, also known as the incisal plane. It can be corrected with orthodontic or prosthodontic treatments.

Inverted Anterior Occlusal Plane

A situation when the anterior occlusal plane is tilted backward, with the upper teeth leaning back.

Curve of Spee

The curved path of the lower teeth from the canine to the condyle, described by F. Graf Von Spee. It influences lateral movement, grinding, parafunctional habits, and temporomandibular joint health.

Lateral Guidance

The ability of the jaw to move sideways, guided by the curve of Spee and the alignment of the teeth.

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Posterior Interferences

When the upper and lower teeth do not meet correctly, leading to grinding or uneven wear.

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Parafunctional Habits

Habits that damage teeth and joints, like clenching or grinding.

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Temporomandibular Joint (TMJ)

The joint that connects the lower jaw to the skull, affected by the curve of Spee.

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Temporomandibular Disorder (TMD)

A condition affecting the TMJ, potentially caused by an imbalance in the curve of Spee.

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Curve of Wilson

A transverse curve that passes along the buccal and lingual cusps of the premolars and molars, observed from a coronal (frontal) plane.

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Posterior Plane of Occlusion

A plane that passes midway between the cusp tips of the mandibular molars and through the incisal edges of the mandibular incisors. It's an average wave plane, and it's unique for each person.

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Curve of Wilson Change

A change in the Curve of Wilson that can occur when maxillary molars are moved buccally (outward) to expand the dental arch. This tipping movement alters the curve across the teeth.

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Excessive Curve of Spee

A condition where the Curve of Spee is excessively curved, impacting muscle balance and proper occlusion (how the teeth meet).

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Class III Lever

The lever system that describes our chewing process.

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Force and Occlusal Tables

When the chewing force is applied closer to the temporomandibular joint (TMJ), more force is needed on the occlusal surfaces.

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Posterior Teeth Function

Posterior teeth are positioned further away from the TMJ and have larger occlusal surfaces.

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Rest Position

The natural, relaxed position of the jaw where the teeth are not touching.

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Posterior Teeth Protection

The posterior teeth are positioned to protect the anterior teeth from excessive force during chewing.

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Occlusal Imbalance

Missing posterior teeth cause an imbalance of forces during biting, leading to excessive wear on the anterior teeth.

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Simultaneous Contact

Both the upper and lower teeth contact simultaneously during the closing movement, distributing the force.

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Importance of Posterior Teeth

Keeping posterior teeth is important for preventing damage to the anterior teeth from excessive shear forces during occlusion.

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Maxillary Central Incisor Contact

The mesial marginal ridge on the lingual surface of the maxillary central incisor is where the tooth contacts during biting.

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Maxillary Incisor Contact

The tooth #8 (Maxillary Central Incisor) and #7 (Maxillary Lateral Incisor) have a specific contact point during biting.

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Maxillary Canine Contact

The mesial marginal ridge of the maxillary canine is where the tooth contacts during biting.

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Ideal Maxillary Occlusal Contacts

The maxillary teeth have specific contact points that provide efficient and balanced chewing.

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Posterior Cusp Function

Not all cusps in posterior teeth have the same function, making posterior occlusion complicated.

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Occlusal Check-Up

The act of checking how well someone's upper and lower teeth fit together.

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Maximum Intercuspation

The point at which the upper and lower teeth meet most closely together.

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Pin-Point Contacts

Tiny, focused points of contact between your upper and lower teeth.

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Anterior Tooth Alignment

The way the teeth are aligned in the front, at the maximum point of contact.

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Posterior Tooth Alignment

The way the teeth are aligned at the back, at the maximum point of contact.

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Occlusal Scheme

The process of analyzing the overall arrangement of teeth and how they make contact when the jaws are closed.

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Static Contacts

Points where the upper and lower teeth touch when the jaws are closed.

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Centric Contacts

The heaviest contacts between the upper and lower teeth, indicating where the most force is applied.

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Articulating Paper

A tool used to mark and see where the teeth are touching when the jaws are closed.

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Articulating Paper Holder

A specialized tool that holds the articulating paper in place during tooth contact

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Articulating Film

A thin sheet of material used to record tooth contacts, providing a more accurate representation of the bite.

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Ideal Thickness of Articulating Paper

The thickness of articulating paper that is recommended by dental professionals for more accurate contact detection during bite analysis

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Abnormal Contacts

Contacts that are either too soon, too numerous, or too heavy, leading to instability and potential damage to the tooth or restoration.

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Cusp to Flat Surface Contact

A type of occlusal contact where a cusp (pointed part) contacts a flat surface, creating a stable and predictable contact.

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Axial Loading

The ideal scenario where forces during biting are directed along the long axis of the tooth, minimizing stress and strain.

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Tripodization

A type of occlusal scheme aiming for 3 points of contact on the occlusal table: one on the functional cusp, one on the non-functional cusp, and one on the marginal ridge.

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Cuspal Interference

A common error where the cusp tip is in contact with the deepest portion of the fossa, creating undesired shearing forces and instability.

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Contact on Buccal Surfaces

A contact on the buccal surfaces of a tooth, which is generally avoided as it can lead to undesirable forces and tooth displacement.

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Excessive Contacts

An excessive number of contacts on a tooth, creating instability and uneven force distribution.

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Study Notes

Static Occlusion II: Occlusal Contacts

  • Static occlusion involves rest position and intermaxillary relations as well as occlusal contacts.
  • Occlusal contacts and mandibular movements involve clinical considerations.
  • Learning objectives include defining occlusal equilibrium, planes and curves of dental occlusion, locating centric contacts, differentiating functional and non-functional cusps, identifying adequate occlusal contacts, and explaining the importance of articulating paper.
  • Occlusal equilibrium involves simultaneous contacts on all teeth without shifting the mandible.
  • It creates harmony in the bite, avoiding discomfort, muscular pain, and temporomandibular alterations.
  • Adequate distribution of occlusal contacts is essential for occlusal equilibrium.
  • The anterior occlusal plane is a line traced along the maxillary incisal edges, determined by the cusp tips of the maxillary central, lateral incisors, and canines.
  • The anterior occlusal plane can be corrected through orthodontia or fixed prosthodontics. Inverted or canted planes also need correction.
  • The curve of Spee is a line starting from the mandibular canine cusp tip, following the buccal cusps of the premolars and molars. It extends through the anterior border of the mandibular ramus and finishes at the anterior aspect of the mandibular condyle.
  • The curve of Wilson is a transverse curve that passes along the buccal and lingual cusps of premolars and molars, viewed through a coronal plane. The curve can vary depending on the buccal and lingual inclinations of the premolars and molars (convex in the maxillary, concave in the mandibular).
  • The curve of Spee and Wilson influence lateral guidance, posterior interferences, parafunctional habits, and TMJ/TMD. Excessive curve of Spee can alter muscle balance and cause improper functional occlusion.

Occlusal Plane

  • The posterior occlusal plane passes midway between the mandibular molar cusp tips and through the incisal edges of the mandibular incisors.
  • It is an average wave plane, differing from one person to another.
  • It can be altered by growth, orthodontics, and dentistry.
  • It combines the curve of Spee and the curve of Wilson.

Posterior Teeth and Occlusion

  • Posterior teeth protect anterior teeth from shear forces during occlusion.
  • Posterior teeth have different cusp functions.
  • Occlusal forces should be directed toward the long axis of all posterior teeth.
  • A parallelogram of forces directs occlusal forces along the long axis of the tooth with 2 contacts on functional cusps, 1 on non-functional cusps with a light contact on the marginal ridge.
  • Inadequate placement of contacts can lead to overload and fracture of the weakest cusps.
  • Functional cusps (stamp/working cusps) have more volume (60%) than non-functional ones (shear cusps) (40%).

Masticatory System and Occlusal Tables

  • The masticatory system is a class III lever system.
  • The TMJ is the fulcrum. Forces originate from muscles.
  • Load is food.
  • Occlusal tables increase in size posteriorly.
  • The closer contacts are to the fulcrum of the TMJ, the greater the force on those occlusal surfaces, and the larger the occlusal surfaces need to be to distribute the forces.

Static Occlusion

  • At rest position, there is no occlusal contact.
  • During closing movement, contacts from maxillary and mandibular teeth support occlusal load.
  • Missing posterior teeth lead to unbalanced occlusal forces and damage the anterior teeth.

Analysis of Occlusion

  • A necessary step in examining occlusion includes placing articulating film in the holder.
  • Have the patient open their mouth, bite, and observe the maximum intercuspation contacts, not clenching.
  • Check the contacts on the right and left posterior teeth and anterior teeth.
  • Identify the normal, abnormal or harmful contacts in maximum intercuspation.
  • Evaluate the intensity of the contact (pin-point/pin-point size), the area of contact position on posterior/anterior teeth.
  • Avoid contact on the buccal surfaces.
  • Strive for pin-point contacts.
  • Minimum 3 contacts on the occlusal table in cusp to flat surface contacts: 1 functional cusp, 1 non-functional cusp, 1 marginal ridge.
  • Two main types of occlusal contact schemes: cusp-to-flat surface and Tripodization.
  • If contacts are not along the long axis, it leads to occlusal overload and fracture of the weakest cusps.

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Description

Test your knowledge on occlusal check-ups and the assessment of normal contacts in maximum intercuspation. This quiz covers the role of articulating film, characteristics of occlusal planes, and the effects of various occlusal factors. Challenge yourself with questions on the dynamics of occlusion and its importance in dental restorations.

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