40 Questions
What is retention of a denture?
Its resistance to removal in a direction opposite to its insertion
What is the physical attraction between unlike molecules?
Adhesion
What is the significance of moderate flow of serous type saliva in denture retention?
It is quite effective for denture retention, provided the denture base can be wetted
What is the primary factor affecting the effectiveness of adhesion in denture retention?
Close adaptation of the denture base to the supporting tissues
What is the role of cohesion in denture retention?
It is the molecular attraction between similar molecules
What is the effect of thick ropy saliva on denture retention?
It adheres well to both denture base and mucosa
What is the primary factor affecting the stability of complete dentures?
Fluidity and consistency of saliva
What is the primary factor in retaining complete dentures, according to the physical factors?
Adhesion and cohesion
What is the primary factor that affects the effectiveness of atmospheric pressure in retaining a denture?
The size of the basal surface of the denture
Why is it essential to have a perfect seal around the border of a denture?
To allow for the effective action of atmospheric pressure
What type of forces are resisted by the retentive force supplied by atmospheric pressure?
Only horizontal dislodging forces
What is the main difference between the retention of upper and lower dentures?
Upper dentures are retained by physical factors, while lower dentures are retained by mechanical forces
What is the relationship between the area covered by the denture base and the retentive force supplied by atmospheric pressure?
The retentive force is directly proportional to the area covered
What is the primary role of air in the retention of an upper denture?
Air expels out from underneath the denture when it is inserted
What is the similarity between the action of cohesion and the action of atmospheric pressure?
Both are similar in their action and effectiveness
What is the primary mechanism by which atmospheric pressure retains an upper denture?
By creating a pressure difference between the fitting surface and the polished surface
What is a characteristic of a V-shaped vault that affects denture retention?
It tends to unseat dentures with vertical forces.
What is the primary advantage of a U-shaped palatal vault for complete dentures?
It resists both vertical and lateral dislodging forces.
What is the primary goal of developing a perfect peripheral seal in denture design?
To allow the cheeks and buccinator muscles to mechanically aid in retention.
What is the shape of the residual ridges in most cases with a V-shaped vault?
V-shaped
What is the classification of the soft palate with a gentle curvature and little muscular movement?
Class I
What is the advantage of a Class I soft palate for complete dentures?
It allows more tissue coverage for producing the palatal seal.
What is the primary purpose of contouring the denture polished surfaces?
To allow the cheeks and buccinator muscles to mechanically aid in retention.
What is the result of vertical forces on a V-shaped vault?
The denture is unseated.
What is the effect of thick flabby tissues on denture stability?
They reduce stability
What is the ideal position of posterior teeth in relation to the mandibular ridge?
Over or slightly lingual to the crest of the ridge
What is the effect of a small interarch distance on denture stability?
It enhances stability
Why is it desirable to reduce thick flabby tissues surgically?
To gain a more stable denture bearing area
What type of tongue enhances denture stability?
Broad thick tongue
What happens when the lingual surface of the teeth exceeds the medial extension of the mylohyoid ridge?
The tongue is cramped and causes lateral movement of the denture
What is the main purpose of placing posterior teeth in a specific position?
To enhance stability of the mandibular denture
What type of tongue movement is affected when the lingual surface of the teeth exceeds the medial extension of the mylohyoid ridge?
Free movement
Where should the teeth be positioned on the mandible to ensure stability?
On the flat surface
What determines the position of the lower occlusal plane?
The height of the lower occlusal plane coinciding with a line extending from the corners of the mouth
What is the purpose of the tongue in relation to food and denture stability?
To function in coordination with the buccinator muscle to keep food on the occlusal surface of the teeth, aiding in lower denture stability
What is the ideal direction of the occlusal plane in relation to the denture foundation area?
Parallel to the denture foundation area
What is the purpose of proper contouring of the denture polished surface?
To allow the tongue, cheek, and lips to seat rather than unseat the dentures
What is the significance of the tissue covering the median palatine suture in relation to the upper denture?
It acts as a shifting fulcrum around which the upper denture can rotate
What is the purpose of proper positioning of the teeth in complete dentures?
To direct forces perpendicular to the supporting basal seat
What is the ideal position of the lower occlusal plane in relation to the tongue?
Below the greatest convexity of the tongue
Test your knowledge of retention and stability of complete dentures, including physical and physiological factors that affect denture retention and more. Learn about the importance of denture retention and how it can be achieved. This quiz covers Chapter 19 of dentures.
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