17 Questions
What is the definition of overjet?
The horizontal overlap of the incisors
What is the correct definition of complete overbite?
The lower incisors contact either the upper incisors or the palatal mucosa
What is an anterior crossbite?
One or more upper incisors are in lingual occlusion with the lower incisors
What is postural jaw position (PJP)?
The position of the jaw when an individual is sitting or standing upright and relaxed
What is Bennett Angle?
The angle formed by the movement of the balancing condyle with the sagittal plane during lateral jaw movement
What does an articulator help to represent?
The temporomandibular joints and jaw members to simulate jaw movements
What type of articulator is recommended for most dental restorations?
Semi-Adjustable Arcon
Which component of the articulator duplicates the arrangement of the TMJ in the Semi-Adjustable Arcon articulator?
Arcon Fossa in the upper member
What is the adjustability of the Simple Hinge articulator in terms of lateral movement?
No lateral movement
What is the adjustability of the intercondylar distance in a Semi-Adjustable articulator?
Fixed at 110mm
What is the function of the Facebow in mounting casts on an articulator?
Records spatial relationship of maxilla and transfers it to the articulator
What does a Fully Adjustable articulator aim to duplicate?
Arrangement of TMJ
What is the definition of Maximum Intercuspation (MI)?
Contact of teeth with maximum clenching
What is Centric Relation (CR) in relation to the masticatory system?
The maxillomandibular relationship in which the condyles articulate with the thinnest avascular portion of their respective discs as a complex in the anterior-superior position against the slopes of the articular eminence
What does Intercuspal Position (ICP) refer to?
Position of the jaw when teeth are in intercuspal contact (IC)
What is meant by Occlusion in dentistry?
Dynamic biological relationship of components of the masticatory system that controls tooth contacts during function and dysfunction
What is Intercuspal Contact (IC)?
Contact between cusps, fossa, marginal ridges of opposing teeth
Study Notes
- Centric occlusion (CO) is the tooth contact position when the jaw is in centric relation
- Tooth contact in CO may be more retruded than at the tooth contact position in the resting position (ICP)
- Postural jaw position (PJP) is the position of the jaw when an individual is sitting or standing upright and relaxed
- A free way space or speaking space is present when the jaw is in PJP
- Occlusal vertical dimension (OVD) is the vertical height of the lower third of the face when teeth contact in ICP
- Lateral jaw positions refer to the side of the jaw that moves laterally away from the midline (working side) and the side that moves towards midline (non-working/balancing side)
- Bennett movement is the bodily lateral movement of the mandible resulting from the movements of the condyles along the lateral inclines of the mandibular fossa
- Bennett Angle is the angle formed by the movement of the balancing condyle with the sagittal plane during lateral jaw movement
- Mandible movements include downward movement (opening of the mouth), forward movement (protrusive movement), and lateral movements (sideways movement of the working side and shift & rotation around the vertical axis of the non-working side)
- Overjet is the horizontal overlap of the incisors
- Normal overjet is 2-3 mm
- Increased overjet is more than 3mm
- Reduced overjet is less than 2mm
- Negative overjet (reverse overjet) is when the lower incisors are ahead of the upper incisors
- Overjet is measured from the labial surface of the lower incisor to the labial surface of the upper incisor
- Overbite is defined as the vertical overlap of the incisors
- Normal overbite is 2-3mm
- Increased or deep bite is more than 3mm
- Reduced overbite is less than 2mm
- Complete overbite is an overbite in which the lower incisors contact either the upper incisors or the palatal mucosa
- Incomplete overbite is an overbite in which the lower incisors contact neither the upper incisors nor the palatal mucosa
- Crossbite is a deviation from the normal buccolingual relationship
- Anterior crossbite is when one or more upper incisors are in lingual occlusion with the lower incisors
- Underbite is the lower front teeth protruding beyond the upper teeth, also known as an anterior crossbite
- Normal OJ, OB, OJ, and crossbite refer to the normal occlusal relationship, increased occlusal relationship, reversed occlusal relationship, and increased and complete openbite
- Articulator is a mechanical device used to represent the temporomandibular joints and the jaw members to which maxillary and mandibular casts may be attached to simulate jaw movements
- Uses of an articulator include diagnosing the state of occlusion for both natural and artificial dentition, planning dental procedures based on the relationship between opposing natural or artificial teeth, aiding in the fabrication of restorations, correcting and modifying completed restoration, and arranging artificial teeth
- Properly-mounted casts allow the operator to visualize the patient's occlusion, especially from the lingual view
- Patient cooperation is not a problem when using an articulator once the appropriate interocclusal records are obtained from the patient
- Reduces chair time and patient appointment time
- Upper member of an articulator includes a triangular frame with the base of the triangle placed posteriorly, two condylar elements projecting on either side of the base of the triangle, and a provision to accommodate the incisal pin
- Lower member of an articulator includes an L-shaped frame with a horizontal arm and a vertical arm
- Horizontal arm is triangular in shape and corresponds to the upper member, and the apex of the triangle contains the incisal guide table
- Vertical arm is rectangular containing the condylar guidance slot at the upper position
- Incisal guide table is the part of the articulator that maintains the incisal guidance of the articulator and can be described as a very short cylindrical whose upper surface is concave
- Incisive rod helps to keep a fixed distance between the upper and lower members at the anterior end and has a pointed tip resting on the center of the incisal guide table during articulation.
Test your knowledge of articulators and occlusion in prosthetic dentistry. This quiz covers topics such as the dynamic biological relationship of components of the masticatory system, tooth contacts during function and dysfunction, and the integrated action of jaw muscles, temporomandibular joint, and teeth.
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