Published on April 26, 2014
Powerpoint Templates Page 1 Powerpoint Templates PARTIAL VENEER CROWNS : preparation and classification Dr Saransh Malot Dept of Prosthodontics
Powerpoint Templates Page 2 Content • Introduction • Types • Indications • contraindications • Advantages • Disadvantages • Armamenteriam • Maxillary posterior ¾ crown • Mandibular posterior ¾ crown • Anterior ¾ crown • 7/8 crown • Proximal half crown • Pin ledge
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Powerpoint Templates Page 4 Types of partial veneer crowns:- For posterior teeth 1. ¾ crown ( three quarter). 2. Modified ¾ crown. 3. 7/8 crown For anterior teeth 1.¾ crown ( three quarter). 2.Pin ledge.
Powerpoint Templates Page 5 INDICATIONS used to restore posterior teeth that have lost moderate amounts of tooth structure. used as retainers. Anterior partial veneers can be used as retainers, to reestablish anterior guidance, and to splint teeth. suitable for teeth with sufficient bulk.
Powerpoint Templates Page 6 CONTRAINDICATIONS: Teeth with short clinical. Contraindicated as retainers for long span bridges. Rarely suitable for endodontically treated teeth (esp. anterior). In dentitions with active caries and / or periodontal disease. In teeth that are proximally bulbous. In poorly aligned teeth.
Powerpoint Templates Page 7 ADVANTAGES: Tooth structure is spared. reduced pulpal and periodontal insult during tooth preparation. Much of the margin is accessible to the dentist for finishing and to the patient for cleaning.
Powerpoint Templates Page 8 Less restoration margin is in proximity to the gingival crevice lowering the possibility of periodontal irritation. An open faced partial veneer crown is more easily seated completely during cementation while a full veneer crown tends to act like a hydraulic cylinder containing a viscous fluid. ADVANTAGES:
Powerpoint Templates Page 9 With some of the margins visible, complete seating of a partial veneer crown is more easily verified. If an electric pulp test ever needs to be conducted on the tooth a portion of enamel is un-veneered and accessible. ADVANTAGES:
Powerpoint Templates Page 10 Less retention and resistance than full coverage crowns. Preparing a tooth for this kind of treatment is difficult primarily because only limited adjustments can be made in the path of withdrawal. DISADVANTAGES:
Powerpoint Templates Page 11 The placement of grooves, boxes and pinholes requires dexterity from the operator. Some metal is displayed in the completed restoration which may be unacceptable to patients with high cosmetic expectations. DISADVANTAGES:
Powerpoint Templates Page 12 ARMAMENTARIUM • Narrow (approximately 0.8 mm), round-tipped, tapered diamond. • Regular-size, (approximately 1.2 mm), round tipped,tapered diamond • Football-shaped or wheel-shaped diamond • Tapered and straight carbide fissure burs • Small, round carbide bur • Small-diameter twist drill • Inverted-cone carbide bur • Finishing stones • Mirror. • Explorer and periodontal probe • Chisels
Powerpoint Templates Page 13 MAXILLARY POSTERIOR ¾ CROWN
Powerpoint Templates Page 14 OCCCLUSAL REDUCTION: • Make depth orientation cuts with ROUND –END TAPERED DIAMOND BUR on the triangular ridges and major developmental grooves of occlusal surface. • Recommended range being 1-1.5 mm with 1.5 mm on the functional cusp.
Powerpoint Templates Page 15 FUNCTIONAL CUSP BEVEL It should extend from the central groove on the proximal surface around to the central on the other proximal surface Begin the functional cusp bevel by placing three to five depth orientation grooves 1.5 mm deep using a ROUND END TAPERED DIAMOND and NO. 171 BUR. The bur is held at 45 degrees to the long axis of the preparation.
Powerpoint Templates Page 16 LINGUAL AXIAL REDUCTION While reducing the lingual surface with a TORPEDO DIAMOND be careful not to over incline the lingual wall.
Powerpoint Templates Page 17 PROXIMAL AXIAL REDUCTION • SHORT NEEDLE- Breaking of contact TORPEDO DIAMOD- Reduction. • As the axial reduction is done, a CHAMFER finish line is formed. This also serves as a guide to producing adequate axial reduction. The removal of tooth structure near the finish margin should equal to one half of the diameter of the diamond or 0.5 mm.
Powerpoint Templates Page 18 PROXIMAL GROOVES TAPERED FISSURE BUR: They are directed to the opposite lingual corner of the tooth forming a lingual hook. Must be cut along a line parallel with a line tangent to the outermost curvature of the tooth. They must be placed as FACIALLY AS POSSIBLE without undermining the facial enamel. They should parallel the long axis of the tooth
Powerpoint Templates Page 19 The groove as far gingivally as possible ending about 0.5 mm above finish line. The proximal groove should have a definite LINGUAL WALL (retention to lingual tipping). Directed toward the middle of the tooth at right angles to the outer surface of the tooth ( prevents undermining of facial enamel and avoids sharp unsupported wings of tooth structure). The distal groove should be cut so that it parallels the mesial groove.
Powerpoint Templates Page 20 OCCLUSAL OFFSET • tapered fissure bur. • It is a 1.0 mm wide ledge or flat terrace on the lingual incline of the facial cusp. It connects the grooves and assuming the shape of an inverted ‘V’. It helps in casting rigidity by tying together the proximal grooves to form a reinforcing staple. Finish it with a end cutting bur
Powerpoint Templates Page 21 FACIAL BEVEL • FLAME DIAMOND AND TAPERED FISSURE BUR • Place a narrow occlusal finish bevel of 0.5mm width along the occlusofacial line angle taking care to keep it perpendicular to the path of insertion The bevel, both flares and the chamfer should connect smoothly to form one continuous finish line without sharp angles.
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Powerpoint Templates Page 23 MANDIBULAR POSTERIOR ¾ CROWN
Powerpoint Templates Page 24 1.Planar occlusal reduction 2. Functional cusp bevel 3.Occlusal shoulder
Powerpoint Templates Page 25 4.Lingual axial reduction 5. Proximal axial reduction. 6.Axial finishing.
Powerpoint Templates Page 26 7. proximal grooves 8.Proximal flare 9.Facial bevel
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Powerpoint Templates Page 28 ANTERIOR ¾ CROWN 1. Lingual reduction 2. Incisal reduction 3. Lingual axial reduction
Powerpoint Templates Page 29 4. Proximal reduction 5. Proximal finishing 6. Proximal grooves
Powerpoint Templates Page 30 7. Proximal flare 8. Incisal offset 9. Incisal bevel
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Powerpoint Templates Page 32 7/8 th CROWN • Planar reduction • Functional bevel • Facial lingual axial reduction • Complete axial reduction
Powerpoint Templates Page 33 • Proximal finishing. • Proximal grooves. • Proximal flare. • Occlusal offset • Occlusal finishing and bevel
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Powerpoint Templates Page 35 PROXIMAL HALF CROWNS • Typical indication of proximal half crown
Powerpoint Templates Page 36 • Occlusal planar reduction • Functional cusp bevel • Mesial axial reduction • Lingual and facial axial reduction
Powerpoint Templates Page 37 Occlusal isthmus and countersink • Occlusal isthmus:- bulk , rigidity and retention • Countersink :- near distal fossa . Supplement retention resistance and bulk.
Powerpoint Templates Page 38 • Facial and lingual grooves • Distal occlusal offset • Flare and occlusal bevel
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Powerpoint Templates Page 40 Pin ledge modified anterior partial veneer crown • 3 grooves :- 1st more mesial . 2nd more lingual. 3rd shorted and near opposite side cingulam (MUST BE PARELLEL)
Powerpoint Templates Page 41 • Ledges and offset
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