Crown fitting and cementation Flashcards
(19 cards)
What should you check for when reviewing the models and die before crown fitting?
Ensure the crown matches the prescription on the lab form. 📝
Verify the correct material and shade were used. 🎨
Check for any damage to the models. 💔
Confirm the final occlusion is correct. ✅
What should you assess before fitting the crown to the patient?
Ensure the tooth has been symptom-free. 🦷
Confirm that the temporary restoration is intact and comfortable (if not, issues like overeruption may occur). 🛑
Determine if local anesthesia (LA) is required for the procedure. 💉
Carefully remove the temporary crown and excavate under the margin before fitting the new crown. 🔪
- Ensure all temporary cement is removed clean the preparation with pumice/water
- Protect the airway with Guaze
What equipment is needed for crown fitting and cementation?
Dental Floss 🧵
Fit Checker Spray 💨
Gold Thickness Gauge ⚖️
Occlusal Indicator Paper 📄
Straight Handpiece (depends on bur required) 🔧
What should you do during the try-in stage of crown fitting?
Use a probe to check the margins of the crown. 🧪
Use dental floss to check the contact points. 🧵
Use occlusal indicator paper to check the occlusion. 📑
What are the steps involved in the cementation of the crown?
Isolate and dry the preparation thoroughly. 💨
Clean and dry the restoration. 🧼
Mix the cement to the right consistency. 🌀
Apply a thin layer of cement into the crown. 🧴
Seat the crown firmly and apply pressure. 💪
Ask the patient to occlude to ensure the crown is fully seated. 👄
Ask the patient to occlude on a cotton wool roll while the cement sets. 🧻
Remove excess cement thoroughly. 🧼
Floss through contact points to ensure there is no cement left. 🧵
Schedule a follow-up review in 2 weeks. 📅
What are the types of luting cements used for crown cementation?
Traditional Cements: Zinc phosphate & zinc polycarboxylate.
Glass Ionomer Cements (GIC): Traditional and resin-modified.
Resin Cements: Multi-step adhesive, simplified, and all-in-one adhesive.
What are the key properties of luting cements?
Prevents Microleakage: Protects the pulp, maintains aesthetics, prevents sensitivity, and reduces the risk of secondary caries. 🦷💧
Mechanical Properties: High compressive strength 💪, low solubility 🌊, retentive to both tooth and restoration 🔗, and low film thickness 📏.
Biocompatibility: Non-harmful to the pulp or gingiva. 🩹
Ease of Use: Sufficient working time ⏱️, easy clean-up of excess cement 🧽, and removability of the restoration if needed. 🧴
What are the properties and indications for zinc phosphate cement?
Indications: Full crowns, conventional bridges, cast posts. 🦷
Properties:
High compressive strength 💪
Low film thickness 📏
5 minutes working time (longer by adding powder incrementally) 🕒
No adhesive properties; relies on micromechanical retention 🔗
High solubility 🌊
What are the properties and indications for zinc polycarboxylate cement?
Indications: Full crowns, conventional bridges, inlays/onlays, temporary filling material. 🦷
Properties:
Moderate compressive strength 💪
Acceptably low film thickness 📏
Chemical adhesion to tooth 🧪
Moderate solubility 🌊
What are the properties and indications for Fuji Plus resin-modified glass ionomer cement?
Indications: Full crowns, conventional bridges, inlays/onlays. 🦷
Properties:
Requires dentine conditioner (citric acid) for optimal results. 🍋
High compressive strength 💪
Acceptably low film thickness 📏
Fluoride release 🦷
Low solubility 🌊
What are the properties and indications for multi-step adhesive resin cements?
Indications: Full crowns, conventional bridges, inlays/onlays, veneers, post, bonded amalgam, RR bridges. 🦷
Properties:
Dual-cure resin composite system 🌟
High bond strength to tooth and metal alloys 🦷
High compressive strength 💪
Low solubility 🌊
Multiple components required (e.g., acid etch, primer, paste A and B). 🧪
What are the properties and indications for simplified resin adhesive cements (RelyX Universal)?
Indications: Full crowns, conventional bridges, inlays/onlays, RR bridges, veneers, posts. 🦷
Properties:
Self-adhesive, dual-cure resin cement 🌟
Built-in metal and ceramic primers 🧪
Very low solubility 🌊
How do you select the appropriate cement for various clinical situations?
What should you do if the crown feels too high for the patient?
Check Margins:
Ensure the crown seats fully. ✅
Check Occlusion:
Use occlusal indicator wax or paper to check occlusion. 📑
Adjust Thickness:
Ensure thickness doesn’t fall below 0.3mm, using an Iwanson gauge. 📏
Polish:
Polish the crown before cementation. 💎
What should you do if the crown is not fully seated?
Check the Fitting Surface:
Look for defects. 🔍
Check the Contact Points:
See if they are too tight. 🧵
Use Fit Checker Medium:
Apply inside the crown to assess fit. 💨
Remake the Crown:
If it still doesn’t fit, remake the crown. 🔄
Check the Preparation:
Ensure no temporary cement or undercuts are affecting fit. ⚠️
What is the luting cement
How do you decide which cement to use?
