Crown fitting and cementation Flashcards
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. 🔪
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. ⚠️
