CLASS II AMALGAM RESTORATION 36MO

Transcription

1 INTERNATIONAL PEER REVIEW CLASS II AMALGAM RESTORATION 36MO Leung Kwan Yu, Steve BDS II - Class 2019, The University of Hong Kong

2 instruments Mirror Periodontal probe Hatchets Gingival margin trimmers Tofflemire matrix retainer Amalgam carrier Condensers Carvers Straight probe Burnishers

3 ONE. mesial box preparation

4 ONE. mesial box preparation Identify contact point

5 ONE. mesial box preparation Identify contact point Where carious lesion most likely occur Just below contact

6 ONE. mesial box preparation Start cutting a mesial box of about 2-3mm, with a tungsten carbide 330 bur on high speed handpiece Retention form

7 ONE. mesial box preparation Start cutting a mesial box of about 2-3mm, with a tungsten carbide 330 bur on high speed handpiece Retention form Pendulum movement of bur helps create this

8 ONE. mesial box preparation Hachet remove mesial wall Resistance to fracture

9 ONE. mesial box preparation Checking with condenser

10 ONE. mesial box preparation Gingival margin trimmer remove unsupported enamel smoothen edges and walls Axiopupal line angle usually bevelled or rounded to reduce stress concentrating at that area

11 ONE. mesial box preparation Checking with straight probe that all margins are smooth Axiopupal line angle usually bevelled or rounded to reduce stress concentrating at that area

12 ONE. mesial box preparation A box with caries removed, and with contact broken on lingual, buccal and gingival surfaces

13 TWO. occlusal preparation Occlusal cavity improves retention About 2-3mm deep Isthmus for retention Start with central pit. Then cut a slot down to mesial box

14 THREE. filling amalgam Tofflemire matrix and retainer Wrapped around 36 A wedge can be placed to allow better adaptation Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

15 THREE. filling amalgam The use of rubber dam is also recommended to prevent the newly placed amalgam from contamination by moisture. Tofflemire matrix and retainer Wrapped around 36 Strength and corrosion resistance of the amalgam may be affected adversely if it is contaminated by moisture. If the alloy contains zinc, such contamination may result in delayed expansion. A wedge can be placed to allow better adaptation Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

16 THREE. filling amalgam SDI lojic+: platinum modified, high silver, non-gamma 2 spherical amalgam Place the first increment of amalgam and condense Mix the amalgam with amalgamator (brand: SDI ultramat 2); 8 seconds Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

17 THREE. filling amalgam Condense after adding each increment Overfill the cavity slightly Condenser and Mortonson 2 condenser SDI lojic+ (slow set) pick up and condensing time: 4 minutes; carving time: 6 minutes Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

18 THREE. filling amalgam Run a straight probe tip along proximal surface to create marginal ridge, and remove excess amalgam Carve from marginal ridge towards centre of tooth Carefully remove the retainer, then the matrix band Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

19 THREE. filling amalgam PK Thomas Burnisher Ball Burnisher Burnishing to obtain smoother surface, before polishing Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

20 THREE. filling amalgam Finishing and Polishing 24 hours after placement In slow speed handpiece with water spray Use burs from coarse to fine Finishing burs: Dome-shaped, pear-shaped, flame-shape, green stone Polishing rubber points: Brownie, greenie, super greenie Tooth isolation Amalgam trituration Filling Carving Burnishing Finishing & Polishing

21 You may want to discuss

22 References Banerjee, A. (2011). Pickard's manual of operative dentistry. Oxford university press.