Extra coronal restorations and crowns

Question 1

Question 1

what is a crown

Answer 1

Question 2

What does taper mean

Answer 2

Question 3

what is the height of crown mean

Answer 3

Question 4

what is a core

Answer 4

Build up teeth by composite core
Completely enclose within crown
Build tooth up and then cut it down to accept crown at top

Question 5

what are the 3 types of crown

Answer 5

Question 6

what are the advantages of FVC

Answer 6

Look at occlusal reductions
Prepare teeth with different dimensions
Lost wax technique

Question 7

what are the disadvantages of FVC

Answer 7

Question 8

what are indications for FVC

Answer 8

Question 9

what is the FVC die preparation

Answer 9

Question 10

describe FVC model and die preparation

Answer 10

Question 11

what is the lost wax preparation

Answer 11

• cusps built up to bring tooth to correct occlusion
• contact points created and cusps added to bring the tooth into the correct occlusion

Question 12

what are advantages of MCC

Answer 12

Question 13

what are MCC disadvantages

Answer 13

Question 14

describe advantages of ACC

Answer 14

Question 15

describe CAD/CAM workflow

Answer 15

Question 15

What is a crown in dentistry?

Answer 15

A crown is a restoration that is constructed outside the mouth and designed to encompass the entire tooth, like a helmet for the tooth! 🦷👑🎩

Question 16

What does “taper” refer to in crown preparation?

Answer 16

Taper is the degree of convergence of the walls of the crown preparation, meaning how much the tooth prep slopes towards the top. 🧰📐

Question 17

What is the “height” of a crown preparation?

Answer 17

The height is the distance from the margin to the occlusal/incisal surface of the tooth prep. 📏📐

Question 18

What is the role of luting cement?

Answer 18

Luting cement is used to bond the crown to the tooth, enhancing its strength and stability. 🧴💪💥

Question 18

What is retention in crown preparation?

Answer 18

Retention refers to designing the prep to prevent the crown from slipping off or twisting. Avoid too much taper! 🚫🔧🔒

Question 19

What is a composite core in crown preparation?

Answer 19

A composite core is used to build up a tooth to fit better inside the crown. It’s like a foundation to hold the crown in place. 🏗️🛠️

Question 20

What is a cast post and core used for?

Answer 20

It’s used after Root Canal Treatment (RCT) to give a foundation for a metal-ceramic crown. 🦷💍⚙️

Question 21

What are the advantages of a Full Veneer Crown (FVC)?

Answer 21

FVCs are strong, have similar hardness to enamel, and require minimal tooth reduction. 💪🦷✨

Question 22

What are the disadvantages of a Full Veneer Crown (FVC)?

Answer 22

FVCs may lack aesthetics (especially gold crowns), and gold is expensive. Also, gold doesn't bond to the tooth well. 💰🚫😬

Question 23

When would you use a Full Veneer Crown (FVC)?

Answer 23

FVCs are ideal for posterior teeth where aesthetics are less of a concern and for teeth with limited height. 🦷💡

Question 24

Describe the lost wax technique used in FVC manufacturing.

Answer 24

Crown model made from an impression. Tooth is separated from the model using a thin saw blade to create a single die. 🔪 Trim the die to expose the prepared margin. 🛠️ Add a die spacer in layers to create room for luting cement. Wax pattern is built up to recreate natural tooth anatomy (making it look like a real tooth!). 🖌️ Sprue former helps molten metal flow into the mold. 🏗️ The wax pattern is placed in a mold and melted away to leave an empty space for the metal. 🔥 The molten metal is forced into the mold, creating a metal alloy version of the wax pattern. 🔩 Lab polishes the unpolished metal crown into a shiny finish. ✨ Contact points checked to make sure everything fits correctly. 🔍

Question 25

What are the types of crowns?

Answer 25

The main types of crowns are: Full Veneer Crown (FVC) Metal-Ceramic Crown (MCC) All-Ceramic Crown (ACC) 🦷✨

Question 26

What is the main advantage of a Metal-Ceramic Crown (MCC)?

Answer 26

MCCs are strong and durable, making them ideal for molars. 💪

Question 27

What is a major disadvantage of Metal-Ceramic Crowns (MCC)?

Answer 27

The porcelain layer must be thicker to cover the metal base, leading to more tooth preparation and potentially a less aesthetic result. 😬

Question 28

How do you create a Metal-Ceramic Crown?

Answer 28

The process includes: Creating a wax pattern for the metal substructure. 🖌️ Spruing and trimming the metal. 🔥 Adding porcelain layers for aesthetics. 🎨✨ Cementing the crown onto the prepared tooth. 🦷🛠️

Question 29

What is an All-Ceramic Crown (ACC) made from?

Answer 29

Lithium disilicate (e.MAX), which is strong, has great aesthetics, and is made using either lost wax technique or CAD/CAM technology. 💎🖥️✨

Question 30

What is the CAD/CAM workflow for creating an All-Ceramic Crown?

Answer 30

Scan the prepared tooth. 🖥️ Design the crown using computer software. 💻 Mill the crown using a machine. 🏗️ Try the crown on the model, check contacts. ✅ Cement the final crown. 🦷💥

Question 31

What are the advantages of All-Ceramic Crowns (ACC)?

Answer 31

They are aesthetic, strong, and can be made quickly using CAD/CAM in one visit! 🏃‍♀️✨🦷

Question 32

What is the role of luting cement in crown placement?

Answer 32

It bonds the crown to the tooth, making everything stronger and securely in place. 🧴💪💥

Question 33

What are the types of luting cements used for crowns?

Answer 33

Resin-based: Strong, ideal for ceramic crowns. 💎 Glass Ionomer: Used for temporary crowns. ⏳ Zinc Phosphate: Traditional cement, less used today. ⚙️

Question 34

What are the steps for crown preparation?

Answer 34

Tooth Reduction: Shape the tooth to fit the crown. 🪓🔪 Impression: Take an accurate impression. 📸👀 Temporary Crown: Place a temporary crown while waiting for the permanent one. 🕰️💍

Question 35

Why might a partial veneer crown be used?

Answer 35

It covers only part of the tooth, ideal when there’s less damage and for conserving tooth structure. 🌱💎🦷

Question 36

What is the purpose of the wax pattern in crown manufacturing?

Answer 36

The wax pattern is created to replicate the natural anatomy of the tooth, which is later converted into a metal alloy or ceramic crown. 🖌️🔥💍

Question 37

What does CAD/CAM stand for?

Answer 37

Computer-Aided Design/Computer-Aided Manufacturing. It allows for digital design and milling of crowns in the dental office. 💻🔧🦷

Question 38

: What is the main difference between Full Veneer Crowns (FVC) and Metal Ceramic Crowns (MCC)?

Answer 38

FVCs are made entirely from metal (gold or non-precious metal) and are ideal for posterior teeth. In contrast, MCCs have a metal substructure with a porcelain layer for aesthetic appeal, making them better suited for anterior teeth. 🦷💍🦷

Question 38

How is the All-Ceramic Crown created using CAD/CAM?

Answer 38

Scan the tooth prep. 📸 Design the crown on the computer. 💻 Mill the crown from a ceramic block. 🛠️ Try the crown, check fit. ✅ Cement the final crown. 🦷✨

Question 39

What happens if too much taper is applied during crown preparation?

Answer 39

If too much taper is applied, the crown might not fit properly, and it can lead to loss of retention. The crown may twist or come off, so it’s important to avoid excessive taper. 🔧⚖️🦷

Question 40