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Tooth 19 Class II MO Cavity Preparation🦷 A Class II MO preparation for tooth 19 (mandibular left first molar) involves creating an access cavity to remove carious lesions on the mesial and occlusal surfaces while maintaining the tooth’s structural integrity. The key steps include: 	1.	Occlusal Preparation: 	•	Establish the outline form on the occlusal surface by using a high-speed handpiece with a 330 or 245 bur. In this case I used a Diamond 330 Burr for the outline and a 245 carbide burr to create the axial depth or slot box for this prep. 	•	Create a dovetail shape to provide retention, ensuring the cavity extends just beyond the carious enamel and into sound dentin. 	•	Maintain smooth, well-defined margins and preserve cusp strength. 	2.	Extension to the Mesial Surface: 	•	Extend the preparation through the marginal ridge to access the mesial proximal box. 	•	Break contact with the adjacent tooth by removing enough enamel and dentin for proper restorative material placement (typically 0.5–1.0 mm clearance). 	•	Ensure the mesial box is slightly flared, with rounded internal angles to minimize stress concentration. 	3.	Axial Wall: 	•	Shape the axial wall to follow the contour of the tooth’s proximal surface. 	•	Maintain a depth of approximately 1.5 mm into dentin, ensuring uniformity and avoiding pulpal exposure. 	4.	Gingival Floor: 	•	Smooth and flatten the gingival floor, maintaining a width of at least 1 mm to support the restorative material. 	•	Break contact with the adjacent tooth gingivally, ensuring no unsupported enamel remains. 	5.	Retention and Resistance Features: 	•	Bevel the axiopulpal line angle slightly to reduce stress. 	•	Ensure retention grooves are placed selectively if additional retention is needed, such as in deep preparations or when using amalgam as a restorative material. 	6.	Finishing Touches: 	•	Smooth all walls and margins to prevent weak spots in the restoration. 	•	Verify occlusal clearance and ensure that there is no interference with opposing teeth. This preparation creates a stable foundation for restoring tooth 19 using either amalgam or composite, depending on the clinical situation. #dentalstudent #dentalschool #dentist #dentaltok #teeth  Day 72/182
Tooth 19 Class II MO Cavity Preparation🦷 A Class II MO preparation for tooth 19 (mandibular left first molar) involves creating an access cavity to remove carious lesions on the mesial and occlusal surfaces while maintaining the tooth’s structural integrity. The key steps include: 1. Occlusal Preparation: • Establish the outline form on the occlusal surface by using a high-speed handpiece with a 330 or 245 bur. In this case I used a Diamond 330 Burr for the outline and a 245 carbide burr to create the axial depth or slot box for this prep. • Create a dovetail shape to provide retention, ensuring the cavity extends just beyond the carious enamel and into sound dentin. • Maintain smooth, well-defined margins and preserve cusp strength. 2. Extension to the Mesial Surface: • Extend the preparation through the marginal ridge to access the mesial proximal box. • Break contact with the adjacent tooth by removing enough enamel and dentin for proper restorative material placement (typically 0.5–1.0 mm clearance). • Ensure the mesial box is slightly flared, with rounded internal angles to minimize stress concentration. 3. Axial Wall: • Shape the axial wall to follow the contour of the tooth’s proximal surface. • Maintain a depth of approximately 1.5 mm into dentin, ensuring uniformity and avoiding pulpal exposure. 4. Gingival Floor: • Smooth and flatten the gingival floor, maintaining a width of at least 1 mm to support the restorative material. • Break contact with the adjacent tooth gingivally, ensuring no unsupported enamel remains. 5. Retention and Resistance Features: • Bevel the axiopulpal line angle slightly to reduce stress. • Ensure retention grooves are placed selectively if additional retention is needed, such as in deep preparations or when using amalgam as a restorative material. 6. Finishing Touches: • Smooth all walls and margins to prevent weak spots in the restoration. • Verify occlusal clearance and ensure that there is no interference with opposing teeth. This preparation creates a stable foundation for restoring tooth 19 using either amalgam or composite, depending on the clinical situation. #dentalstudent #dentalschool #dentist #dentaltok #teeth Day 72/182

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