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Types of Finish Lines in Tooth Preparation:
Chamfer:
Used for: Metal crowns, lingual of PFM crowns.
Bur: Round-end tapered diamond.
Advantage: Conservative, smooth transition.
Shape:
Rounded, scooped-out margin.
Heavy Chamfer / Deep Chamfer:
Used for: PFM crowns (especially buccal side).
Allows: Enough space for porcelain buildup.
Shoulder:
Used for: All-ceramic crowns, anterior PFM.
Bur: Flat-end tapered diamond.
Shape: Flat, 90° angle finish line.
Advantage: Strong support for brittle ceramic.
Radial Shoulder / Rounded Shoulder:
Used for: All-ceramic crowns (e.g., E.max, zirconia).
Rounded internal angle reduces stress concentration.
Knife-Edge:
Used for: Sometimes with full metal crowns.
Disadvantage: Difficult to detect on impression, thin margin can distort.
Key Considerations:
Marginal Fit: A smooth, well-defined finish line ensures a better seal and reduces microleakage.
Tissue Health: Subgingival margins should be smooth to avoid plaque accumulation.
Material Compatibility: Choose the finish line based on the type of crown material.
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PVS Impression
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Porcelain-Fused-to-Metal (PFM) Crown Preparation is a common technique used in restorative dentistry to provide strength and esthetics. The preparation must balance retention, resistance, and adequate space for both the metal and porcelain layers.
Step-by-Step PFM Crown Preparation
1. Tooth Reduction
Occlusal Reduction (1.5 - 2 mm):
Use a round-end tapered diamond bur to create functional and non-functional cusp clearance.
Maintain anatomical contours.
Axial Reduction (1.2 - 1.5 mm):
Reduce the buccal and lingual surfaces while keeping a uniform taper (6-10°).
Buccal reduction should be 1.5 mm for esthetic porcelain coverage.
Lingual reduction can be 1.0 - 1.2 mm if metal occlusion is planned.
2. Margin Design
Buccal Margin:
Heavy chamfer or Shoulder (1.2 - 1.5 mm) to support porcelain.
Lingual Margin:
Light chamfer (0.5 - 1 mm) if metal is on the lingual surface.
Interproximal Clearance:
Ensure at least 1 mm space to accommodate the crown.
3. Finishing & Evaluation
Smooth all sharp angles to prevent stress fractures.
Verify adequate clearance in occlusion.
Ensure smooth, well-defined margins for a proper fit..
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✨“Precision in every detail! ✨
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“Precision is everything! 🦷✨ A detailed view of the tooth preparation.
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✨"Precision in every detail! ✨
Choosing the right tools is key for accuracy and efficiency! Thanks to styleitaliano_official for this kit!
#DentalBurs #ToothPreparation #Prosthodontics #AestheticDentistry #RestorativeDentistry #DentalLab #SmileDesign #DentistryWorld”
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Precision, symmetry, and conservation—every prep is a blend of science and artistry! The foundation of a perfect restoration starts here.
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Master the prep, and you master the restoration! 💎
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재보철치료과정에서의 단상
1. subgingival margin - 치은연하부분은 레진코어, 프렙, 인상채득, 세팅등 모든과정이 어려워집니다. 게다가 프렙량도 많아질수 밖에 없습니다. 파절, 우식등으로 이미 연하로 된 부분을 제외하고는 가급적 연상으로 진행을 하고, 마지막에 프렙할때 보이는 부분만 연하로 내리는게 최선인거 같습니다. 이 케이스에서도 원심부분이 우식으로 깊어서 그 부분이 우식제거, 레진코어할때도 까다로웠고, 프렙은 어렵진 않았지만 삭제량이(근심에 비해서) 많아졌습니다.
2. 하악대구치 프렙시 원심설측은 항상 어렵습니다. 보이지도 않고, 혀도 있고...그 부분을 잘하려고 끙끙대기보다는 일단 잘보이는 부분들을 해놓고, 원심설측은 마지막에 집중에서 끝내면 훨씬 수월한거 같습니다. 다른 부분을 어느 정도 해놓으면 원심설측 깎을 부분이 별로 많지 않은거 같습니다.
3. 경험이 쌓이면서 여러가지 요령과 꼼수(?)가 늘어가는거 같습니다. 하지만 이런 요령들도 결국 기본적인 원칙위에 있을때 빛을 발하는거 같습니다.
#prosthodontics #subgingival #isolation #toothpreparation #fundamentals
