Differences-Between-Cast-Restoration-and-Amalgam[1].pptx

Class 2 and inlay

1. Differences In Class II Silver Amalgam And Class II Inlay PRESENTED BY VARSHA PAWAR (FINAL YEAR) ))

2. AMALGAM INLAY Amalgam restoration is direct procedure that can be finished in one appointment. Cast inlay is an indirect procedure requiring two appointments. One for tooth preparation and the other for delivering restoration. Indicated in conservative and moderate carious lesions. Indicated in extensive carious lesions due to durability, biocompatibility and ability to withstand forces. Indicated in young as well as old patients. Contraindicated in young patients, due to presence of large pulp chambers and in old patients, due to lengthy and multistep procedures. Indicated as interim and caries control restorations. Contraindicated in patients with high caries rate. There is less control on the placement of proper contours and contacts. Superior control of contours and contacts can be achieved. It is indicated for diastema closure between teeth. Inexpensive. More cost to the patient.

3. SILVER AMALGAM INLAY edge strength i.e (the resistance to fracture of the beveled extension normally located at the cavosurface margin of dental restoration) is less High edge strength due to precise fabrication process involved. Concern of mercury toxicity. Biocompatible as high gold dental casting alloys are unreactive in oral environment. Alloys used are noble metals,base metals ,and recent alloys such as titanium Less technique sensitive More technique sensitive.

4. Outline form SILVER AMALGAM Outline form is narrow as there is no surface involvement and walls converge occlusally . CLASS INLAY Outline form is wide as the surface involvement is more and cavity walls diverge occlusally(2-5 degrees divergence)

5. Cavity width SILVER AMALGAM 1/4 th the intercuspal distance As it helps to preserve the structural integrity of the tooth .This limitation minimizes the risk of undermining the remaining tooth structure reducing the chances of fracture. CLASS INLAY 1/3 rd the intercuspal distance This ratio helps ensure proper thickness of the restorative material allowing for the sufficient strength and support.

6. Burs SILVER AMALGAM No. 245 and no. 230 245 is a tapered fissure used for intial enamel and dentin removal and also ensure smooth internal walls.230 helps in refining the cavity and creating a rounded internal line angle CLASS INLAY No. 271 and 169 L 271 is a pear shaped design and is often used for intial penetration into tooth structure .169L is tapered fissure and is useful in refining the cavity walls and creating a smooth walls.

7. CAVOSURFACE ANGLE SILVER AMALGAM 90 degrees(for easier condensation of the amalgam material during placement improving its adaption) To establish butt joint with amalgam.(where two dental amalgm restoration meet without overlap) Metal margin is 90 degrees. CLASS II INLAY 130- 140 degrees to achieve a lap sliding fit(overlap of the restoration with the prepared tooth structure) Metal margin is 30-40 degrees which allows the metal to be burnished against the tooth surface

8. BEVELS SILVER AMALGAM Bevelling is done only on the gingival cavosurface margin to remove unsupported enamel. CLASS II INLAY Bevels of 30- 40 degrees are placed at the occlusal and gingival cavosurface margins to achieve a lap sliding fit.

9. Gingival Bevel Silver amalgam 15- 20 degrees Class II inlay 30 degrees and also reverse bevel is given in inlay at gingival floor. Reverse bevel prevents tipping of restoration.

10. AXIOPULPAL LINE ANGLE SILVER AMALGAM Rounded line and point angles Bevelled axiopulpal line angle CLASS II INLAY Well defined line and point angles. Rounded axiopulpal line angle

11. SILVER AMALGAM CLASS II INLAY Undercuts improve retention Undercuts should be absent

12. FLARES SILVER AMALGAM CLASS II INLAY No flares are given . Primary and secondary Flares are flat or concave pheripheral flares are given . Preparation of facial and lingual walls. Primary bevel is indicated when normal Contacts are present. Secondary flares are indicated when Broad contacts are present

13. REVERSE S CURVE SILVER AMALGAM CLASS II INLAY In tooth with broad contacts The Reverse curve is not provided reverse s curve is given to broaden the contacts and yet to remove less tooth structure.

14. GINGIVAL SEAT SILVER AMALGAM CLASS II INLAY Gingival seat should be located Subgingival extension of supragingivally gingival seat is acceptable

15. SECONDARY RETENTION SILVER AMALGAM CLASS II INLAY Secondary retention is Secondary retention is provided by grooves, provided by locks, slots Slots ,pins collars, and reverse bevel

16. SECONDARY RETENTION SILVER AMALGAM CLASS II INLAY Secondary retention is Secondary retention is provided by grooves, provided by locks, slots Slots ,pins collars, and reverse bevel

17. Proximally, minimal clearance Proximally more clearance is acceptable is provided not more than 0.5mm from adjacent tooth. SILVER AMALGAM CLASS II INLAY

18. PULP PROTECTION SILVER AMALGAM CLASS II INLAY Cements as bases or varnish are Luting cements are used used for pulp protection. for cementation . Calcium hydroxide as linear and GIC as base. .

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