Podcast
Questions and Answers
What is the purpose of tapering a tooth before placing a crown?
What is the purpose of tapering a tooth before placing a crown?
- To increase the strength of the tooth structure
- To ensure the crown fits properly (correct)
- To prevent tooth decay in the surrounding area
- To reduce the tooth size and enhance aesthetics
What type of impression is made of the prepared tooth for a crown?
What type of impression is made of the prepared tooth for a crown?
- Positive reproduction
- Direct impression
- Functional impression
- Negative reproduction (correct)
What is the role of the finish line in tooth preparation for a crown?
What is the role of the finish line in tooth preparation for a crown?
- It provides a guide for shaping the temporary restoration (correct)
- It is where the tooth begins to decay
- It marks the end of enamel removal
- It indicates the level of the gum line
How long does it typically take to make a permanent crown for a tooth?
How long does it typically take to make a permanent crown for a tooth?
What procedure may be required if a tooth is too broken down before placing a crown?
What procedure may be required if a tooth is too broken down before placing a crown?
What is the primary purpose of contouring and crimping pliers in crown preparation?
What is the primary purpose of contouring and crimping pliers in crown preparation?
What is the key component of Zinc Oxide and Eugenol temporary cement that gives it a sedative effect on the pulp?
What is the key component of Zinc Oxide and Eugenol temporary cement that gives it a sedative effect on the pulp?
How should the powder and liquid components of the temporary cement be combined?
How should the powder and liquid components of the temporary cement be combined?
What effect does adding water during the manufacturing of Zinc Oxide have?
What effect does adding water during the manufacturing of Zinc Oxide have?
What is the recommended mixing time for Zinc Oxide and Eugenol temporary cement?
What is the recommended mixing time for Zinc Oxide and Eugenol temporary cement?
What is the mixing medium used for temporary crowns?
What is the mixing medium used for temporary crowns?
What is the duration for which TEMPBOND is expected to last?
What is the duration for which TEMPBOND is expected to last?
Which item is NOT part of the armamentarium for temporary crown preparation?
Which item is NOT part of the armamentarium for temporary crown preparation?
When preparing a temporary crown, what should be done after inscribing the trim line?
When preparing a temporary crown, what should be done after inscribing the trim line?
Which type of TEMPBOND allows for single-dose mixing?
Which type of TEMPBOND allows for single-dose mixing?
Why is it important for a patient to return for a permanent crown after using a temporary crown?
Why is it important for a patient to return for a permanent crown after using a temporary crown?
What should the ball burnisher primarily be used for in temporary crown preparation?
What should the ball burnisher primarily be used for in temporary crown preparation?
What is the purpose of crimping the margin of the temporary crown?
What is the purpose of crimping the margin of the temporary crown?
What sound indicates that a temporary crown is fitting snugly into place?
What sound indicates that a temporary crown is fitting snugly into place?
Which of the following steps is NOT part of the temporary crown preparation process?
Which of the following steps is NOT part of the temporary crown preparation process?
During cementation, what is the purpose of placing cotton rolls in the buccal and lingual areas?
During cementation, what is the purpose of placing cotton rolls in the buccal and lingual areas?
What should be done to excess cement after cementation of the crown?
What should be done to excess cement after cementation of the crown?
What must be checked with the use of articulating paper after seating the temporary crown?
What must be checked with the use of articulating paper after seating the temporary crown?
What is the primary purpose of placing a temporary crown?
What is the primary purpose of placing a temporary crown?
Which type of temporary crown is known for its ease of adjustment due to malleability?
Which type of temporary crown is known for its ease of adjustment due to malleability?
What is a major advantage of using aluminum crowns?
What is a major advantage of using aluminum crowns?
What limitation of aluminum crowns should be considered during treatment?
What limitation of aluminum crowns should be considered during treatment?
During the crown fitting procedure, what is the maximum occluso-cervical height the crown should extend below the free gingival margins?
During the crown fitting procedure, what is the maximum occluso-cervical height the crown should extend below the free gingival margins?
What material is commonly used to cover cavity medications in the crown preparation process?
What material is commonly used to cover cavity medications in the crown preparation process?
Which of the following is NOT a type of temporary crown mentioned?
Which of the following is NOT a type of temporary crown mentioned?
What must the dentist ensure when selecting a temporary crown for a tooth?
What must the dentist ensure when selecting a temporary crown for a tooth?
Study Notes
Temporary Crowns
- Temporary crowns are used when a tooth requires a permanent crown but needs to be protected in the meantime.
- The dentist may need to build up the tooth with filling material if a large portion of the tooth has been broken down, making it taller before preparing it for the crown.
- When preparing a tooth for a crown, the dentist reduces the size of the tooth and shapes it in a specific taper, ensuring the crown fits properly.
- The finish line, also known as the gingival line or CEJ, marks where the tooth preparation ends.
- The dentist takes an impression of the prepared tooth to create a model used for fabricating the permanent crown.
- A temporary crown is placed over the prepared tooth until the permanent crown is ready.
- The temporary crown protects the tooth, avoids sensitivity, and maintains function and aesthetics.
- Temporary crowns are also used for primary teeth.
Types of Temporary Crowns
- Custom-constructed crowns: Made specifically for the patient's tooth.
- Pre-formed acrylic crowns: Ready-made acrylic crowns that are adjusted to fit the tooth.
- Pre-formed metal crowns: Thin metal or aluminum crowns, commonly used on premolars and molars.
Aluminum Crowns
- Used most commonly on premolars and molars.
- Advantages include resistance to wear, strength, malleability.
- Can be contoured and burnished without wrinkling.
- The chief disadvantage is its softness, making it prone to wear quickly.
Placement of Preformed Aluminum Crowns
- Step I: The dentist prepares the tooth, reducing its circumference and height, removes decay, and places cavity medications.
- Step II: The dentist selects the proper crown, ensuring it fits the tooth's circumference and mesio-distal dimensions.
- Step III: The dentist adjusts the occluso-cervical height of the crown to ensure it does not extend more than 2mm below the free gingival margin. The crown is then trimmed and smoothed.
- Step IV: The dentist uses zinc oxide and eugenol (ZOE) temporary cement to secure the crown. The cement provides a sedative effect on the pulp and is mixed on a parchment mixing pad or a cool glass slab.
- Step V: The dentist places the cement on the crown, seats the crown, and removes excess cement.
Patient Instructions
- Patients should chew and eat with the temporary crown as they would a natural tooth.
- The crown will last approximately six months due to the weak luting cement.
- Patients should brush and care for the temporary crown as they would a natural tooth.
- The crown should be replaced if it falls off or becomes loose.
Evaluation Criteria for Temporary Crown Placement
- Crown Selection: The correct crown size and shape.
- Crown Trimming: Smooth, well-trimmed edges.
- Crimping and Contouring: Properly crimped and contoured margins.
- Snug Fitting: The crown fits snugly and securely on the prepared tooth.
- Contact with Adjacent Teeth: The temporary crown contacts the adjacent teeth.
- Smooth Surfaces: Smooth surfaces free of voids or rough edges.
- Excess Cement Removal: All excess cement is removed.
- Occlusion: The crown contacts the opposing teeth correctly.
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Description
Explore the essential role of temporary crowns in dental procedures. This quiz covers their purpose, preparation process, and the types of temporary crowns available. Ideal for dental students and practitioners seeking to enhance their understanding of this crucial aspect of restorative dentistry.
