Prosthodontics Part 2 (Dr.Kalid)

Acrylic teeth are chemically bonded to the acrylic denture base. This means that a chemical reaction occurs between the acrylic material of the teeth and the denture base, creating a strong bond. This bonding process ensures that the teeth remain securely attached to the denture base, providing stability and durability for the denture. Porcelain, ceramic, and metallic teeth, on the other hand, may be mechanically or adhesively attached to the denture base, but they are not chemically bonded like acrylic teeth.

Condylar guidance refers to the movement of the mandible (lower jaw) in relation to the temporomandibular joint (TMJ). It is a natural and individualized movement that cannot be controlled or manipulated by a dentist. In contrast, incisal guidance, overjet, and overbite are dental terms that can be influenced and controlled by a dentist through various treatments and interventions. Therefore, condylar guidance is the only option that is not under a dentist's control.

The correct answer is "all of the above". Mandibular movement is influenced by opposing teeth contact, TMJs (temporomandibular joints), and the neuromuscular system. Opposing teeth contact plays a role in determining the position and movement of the mandible during activities such as chewing and speaking. The TMJs are the joints connecting the mandible to the skull and are responsible for facilitating jaw movement. The neuromuscular system, which includes the nerves and muscles involved in jaw movement, also influences mandibular movement. Therefore, all of these factors contribute to the influence on mandibular movement.

The correct answer is "bennett shift". Lateral movement of the mandible is referred to as the Bennett shift. This term is used to describe the movement of the mandible towards the working side during lateral jaw movements. It is an important concept in dentistry and orthodontics, as it plays a role in occlusion and jaw function.

Acrylic teeth can be used in cases with limited occlusal gap, meaning that they can be used in situations where there is not much space between the upper and lower teeth. Additionally, acrylic teeth are chemically bonded to the denture, ensuring a secure attachment. They can also be easily ground if necessary for adjustments or modifications. Therefore, all of the statements mentioned are true about acrylic teeth.

The correct answer is freeway space. The term "interocclusal distance" refers to the space between the upper and lower teeth when the jaw is in a relaxed, unstrained position. This space is also known as the "freeway space" because it represents the amount of vertical movement or freedom the jaw has when not in contact or occlusion. The other options, leeway space, seeway space, and cobleman space, are not synonymous with interocclusal distance and do not accurately describe the concept of the space between the teeth in a relaxed jaw position.

The Hanau model articulator is classified as a semi-adjustable articulator. This means that it allows for some adjustments to be made to simulate the movement of the patient's jaw, but it does not provide full adjustability like a fully adjustable articulator. The Hanau model articulator is commonly used in dentistry for tasks such as mounting dental casts and planning dental treatments.

Vinyl or polystyrene can be considered as temporary recording base materials because they are easily moldable and can be used to create temporary dental appliances or records. These materials can be easily manipulated and shaped to fit the patient's oral cavity, and they can also be easily removed or replaced when necessary. In contrast, heat cured acrylic resin, gold, and base metal alloy are more commonly used for permanent dental restorations and appliances.

The buccolingual width of posterior artificial teeth should be less than natural teeth. This is because artificial teeth are typically narrower in order to accommodate for the reduced space available in the mouth. If the artificial teeth were the same or greater width than natural teeth, they may not fit properly or cause discomfort for the patient. Therefore, it is important for the buccolingual width of posterior artificial teeth to be less than natural teeth.

The ideal height of the anterior maxillary occlusion rim from the reflection of the cast should be approximately 22 mm. This measurement is important in dentistry as it helps determine the proper position and height of the artificial teeth in a denture. Having the occlusion rim at the correct height ensures proper function and aesthetics of the denture.

The ideal height of the anterior mandibular occlusion rim from the reflection of the cast should be approximately 16 mm. This measurement is important in dentistry as it helps determine the correct height for the occlusal plane, which is crucial for proper functioning of the teeth and jaw.

The condylar guidance in an arcon articulator is located in the upper membrane on the articular. This means that the upper part of the articulator is responsible for guiding the movement of the condyles, which are the rounded projections on the mandible that articulate with the skull. This guidance is crucial in ensuring proper alignment and movement of the mandible during dental procedures.

خدوا بالكم يا اولاد ان ال camper line = ala tragus line

High condylar guidance refers to the angle at which the condyles of the mandible move in the temporomandibular joint during various jaw movements. A greater compensating curve is required in high condylar guidance because it helps to maintain a stable occlusion and prevent excessive forces on the teeth and jaw joints. This compensating curve allows for proper distribution of forces during chewing and other jaw movements, reducing the risk of tooth wear, muscle strain, and temporomandibular joint disorders.

Both interocclusal record and hinge-axis record are used for transferring maxillomandibular relation from the patient to the articulator. The interocclusal record is used to capture the relationship between the upper and lower teeth when the patient bites down, providing a record of their occlusion. The hinge-axis record, on the other hand, is used to determine the location of the patient's hinge axis, which is important for setting up the articulator to mimic the patient's jaw movements. Therefore, both of these records are necessary for accurately transferring the maxillomandibular relation to the articulator.

In complete denture, the vertical dimension of occlusion should be 2-3 mm less compared to the vertical dimension of rest. The vertical dimension of rest refers to the distance between the maxilla and the mandible when the muscles are in a relaxed position. The vertical dimension of occlusion, on the other hand, refers to the distance between the maxilla and the mandible when the teeth are in contact during biting or chewing. By reducing the vertical dimension of occlusion, it helps to prevent excessive force on the supporting structures and ensures proper functioning and stability of the denture.

The proper arrangement of maxillary and mandibular anterior and posterior teeth depends on the setting of the maxillary central incisor. This is because the maxillary central incisor is considered the key tooth in establishing the esthetics and function of the dental arch. It serves as a reference point for the positioning of other teeth, such as the maxillary canines and lateral incisors. Therefore, ensuring the correct setting of the maxillary central incisor is crucial in achieving a harmonious and functional occlusion.

A face bow is a dental instrument used to record the relationship between the upper and lower jaws. It helps in determining the hinge axis, which is an imaginary line around which the lower jaw rotates. This axis is important in establishing the centric relation, which is the most retruded and stable position of the lower jaw. By accurately recording the hinge axis, the face bow aids in achieving an accurate centric relation record, which is crucial for various dental procedures such as denture fabrication, occlusal adjustments, and orthodontic treatments.

In the retruded position of the mandible, the head of the condyle can only rotate. This means that it can move in a circular motion around its axis. Translation refers to a linear movement, which is not possible in this position. Therefore, the correct answer is rotate.

The Hanau equation is used to calculate the Bennett angle, which is the angle formed between the horizontal and vertical components of the occlusal plane. According to the equation, the Bennett angle can never be less than 12 degrees.

The Bennett angle is a measurement used in dentistry to determine the movement of the mandible (lower jaw) during lateral jaw movements. It is the angle formed between the sagittal plane (a vertical plane passing through the body) and the condylar path (the path traced by the condyle of the mandible). The balancing side condyle refers to the condyle on the non-working side of the jaw during lateral movements. Therefore, the correct answer is "balancing side condyle" because the Bennett angle is subtended by this condyle.

The supporting cusps of maxillary posterior teeth articulate with both the central fossa and the marginal ridge of mandibular posterior teeth. This means that the cusps of the upper back teeth make contact with both the central depression on the chewing surface of the lower back teeth, as well as the raised ridge on the sides of the lower back teeth. This dual articulation helps to ensure a stable and balanced bite, allowing for efficient chewing and grinding of food.