27 Questions
What is the primary indication for Class III tooth preparations?
To restore esthetic prominent areas on anterior teeth
In Class III cavity preparations, what type of margins are considered the best scenario?
Enamel margins only
What is the depth of the box shape in Class III cavity preparations on the root surface?
0.75mm
What is the required angle for the cavosurface margin in Class III cavity preparations?
90°
When is the groove retention used in Class III tooth preparations?
Only when deemed necessary to increase retention
What is the purpose of beveled conventional cavity preparation?
To provide additional retention for the restoration
What are the indications for minimal invasive (modified) conventional cavity preparation?
When conservation of tooth structure is a priority
What is the depth of the box shape in Class IV cavity preparations in dentin?
$0.2mm$
'Class IV tooth preparations' are located on which surfaces of teeth?
'Facial' and 'lingual' surfaces of anterior teeth
'Conventional cavity preparation' for Class III restorations may be indicated when:
'Gingival and incisal retention' is needed to increase retention
In Class III cavity preparations, what is the purpose of 'tooth preparation have all – enamel margins'?
To allow adequate isolation for an effective bond
What is the primary purpose of preparing 'large Class III tooth preparation extending onto root surface'?
To improve retention by extending onto the root surface when deemed necessary
What is the main reason for beveling the enamel walls in a conventional cavity preparation?
To expose maximum number of enamel rods for etching and bonding
What is the main feature of a modified cavity preparation?
Scooped or concave preparation design
In a small, scoop-shaped Class III tooth preparation, what should the outline form ideally not include?
Extension onto the facial surface
What is the preferred approach for beginning a Class III tooth preparation?
Lingual approach
When is the facial approach used for tooth preparation?
All of the above
What is the primary reason for using diamond stones for tooth preparation?
To increase the surface area and micromechanical retention
Which of the following is a cause of class IV tooth preparations?
All options are causes of class IV tooth preparations
What is the main objective of bevelled cavosurface margins?
To increase surface substrate area needed for bonding
Why is it important not to place a bevel in certain situations?
To prevent unnecessary removal of tooth structure
What is the purpose of bevelling in composite restoration?
To increase the surface area and retention
In which area would retention be made on bonding dentin and gingival groove?
Gingival area where thin or no enamel is found
What is the purpose of hollow ground in composite restoration?
To avoid overhangs and concave grinding
When is a long bevel used in composite restoration?
When there is not enough thickness of enamel to offer retention
What is the purpose of scalloping in composite restoration?
To increase the surface area and retention
What type of bevel involves grinding the entire enamel wall when there is not enough thickness of enamel for retention?
Full bevel
Learn about the techniques and indications for Class III and IV cavity preparation for composite restoration in dentistry. This quiz is based on the lecture by Dr. Ahmed Holiel, BDS, MSc, PhD, a lecturer of Conservative Dentistry at Alexandria University.
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