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General Dentistry/ Matrix Systems Chapters 48 & 49.

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Presentation on theme: "General Dentistry/ Matrix Systems Chapters 48 & 49."— Presentation transcript:

1 General Dentistry/ Matrix Systems Chapters 48 & 49

2 Restorative Dentistry Indicated when teeth must be restored to their original structure by the use of direct or indirect restorative materials. Indicated when teeth must be restored to their original structure by the use of direct or indirect restorative materials. Conditions that determine the need for restorative dentistry: Conditions that determine the need for restorative dentistry: Initial or recurring decay Initial or recurring decay Replacement of failed restorations Replacement of failed restorations Abrasion or wearing away of tooth structures Abrasion or wearing away of tooth structures Erosion of tooth structure Erosion of tooth structure

3 Esthetic Dentistry Primarily devoted to improving the appearance of teeth by either restoring imperfections with direct or indirect restorative materials Primarily devoted to improving the appearance of teeth by either restoring imperfections with direct or indirect restorative materials Specific conditions that initiate a need for esthetic treatment include the following Specific conditions that initiate a need for esthetic treatment include the following Discoloration due to extrinsic or intrinsic staining Discoloration due to extrinsic or intrinsic staining Anomalies caused by developmental distrubances Anomalies caused by developmental distrubances Abnormal spacing between teeth Abnormal spacing between teeth trauma trauma

4 Cavity Preparation Process of removing unhealthy tooth structure while leaving a limited amount of healthy tooth structure for the tooth to maintain a restoration Process of removing unhealthy tooth structure while leaving a limited amount of healthy tooth structure for the tooth to maintain a restoration Two stages: Two stages: Initial preparation Initial preparation Access to decay Access to decay Outline form Outline form Primary resistance form Primary resistance form

5 Final preparation Final preparation Remove any remaining enamel in the prep Remove any remaining enamel in the prep Additional resistance and retention Additional resistance and retention Place protective materials Place protective materials

6 Terminology Cavity Wall: Cavity Wall: Internal surface of tooth prepared for the restoration Internal surface of tooth prepared for the restoration Internal wall: Internal wall: Cavity wall/surface that does not extend to the external tooth surface Cavity wall/surface that does not extend to the external tooth surface External wall: External wall: Surface of the tooth preparation that extends to the external tooth surface, named according to the tooth surface involved; distal, mesial, facial, lingual, gingival Surface of the tooth preparation that extends to the external tooth surface, named according to the tooth surface involved; distal, mesial, facial, lingual, gingival

7 Axial wall: Axial wall: Internal wall/surface of the prepared tooth that runs parallel to the long axis of the tooth Internal wall/surface of the prepared tooth that runs parallel to the long axis of the tooth Pulpal wall: Pulpal wall: Internal wall/surface of a prepared tooth that is perpendicular to the long axis of the tooth; also known as the pulpal floor Internal wall/surface of a prepared tooth that is perpendicular to the long axis of the tooth; also known as the pulpal floor

8 Line angle: Line angle: Angle formed by the junction of two walls/surface in a cavity preparation (such as a corner) Angle formed by the junction of two walls/surface in a cavity preparation (such as a corner) The names of the two walls are combined and form a new angle. Such as mesial and lingual, and becomes mesiolingual angle. The names of the two walls are combined and form a new angle. Such as mesial and lingual, and becomes mesiolingual angle.

9 Classifications Class I Class I Small and involves the pits and fissures of teeth Small and involves the pits and fissures of teeth Class II Class II Extension of Class I, into the proximal surface(s) of premolars and molars Extension of Class I, into the proximal surface(s) of premolars and molars Class III Class III Affects the interproximal surface (mesial or distal) of incisors and canines Affects the interproximal surface (mesial or distal) of incisors and canines

10 Class IV Class IV Involves larger surface area, that includes the incisal edge and the interproximal surface of incisors and canines Involves larger surface area, that includes the incisal edge and the interproximal surface of incisors and canines Class V Class V Smooth surface restorations Smooth surface restorations Gingival third of the facial or lingual surfaces of any tooth Gingival third of the facial or lingual surfaces of any tooth

11 Complex Restorations When the loss of the tooth structure becomes greater than the remaining natural tooth that is left. When the loss of the tooth structure becomes greater than the remaining natural tooth that is left. Decision has to be made whether to restore with a crown or direct restoration (such as amalgam or composite) Decision has to be made whether to restore with a crown or direct restoration (such as amalgam or composite) If a direct restoration is decided upon, Retention Pins may be needed. Pins provide stronger system for retaining and supporting the restoration other than retentive grooves or bonding materials If a direct restoration is decided upon, Retention Pins may be needed. Pins provide stronger system for retaining and supporting the restoration other than retentive grooves or bonding materials

12 Retention Pins Retention Pins May be required when tooth decay has extended into the distolingual cusp, undermining the enamel and dentin. May be required when tooth decay has extended into the distolingual cusp, undermining the enamel and dentin. One pin would be placed for each missing cusp One pin would be placed for each missing cusp

13 Veneers A thin layer of tooth colored material that is applied to the facial surface of a prepared tooth. A thin layer of tooth colored material that is applied to the facial surface of a prepared tooth. Can be used for more than one tooth Can be used for more than one tooth Improves appearance, (such as) Improves appearance, (such as) Slightly abraded Slightly abraded Eroded Eroded Dicolored (intrinsic stains or after endo treatment) Dicolored (intrinsic stains or after endo treatment) Alignment (diastema) Alignment (diastema)

14 Tooth Whitening Also known as Vital bleaching Also known as Vital bleaching Noninvasive method of lightening of teeth Noninvasive method of lightening of teeth In office and at-home methods In office and at-home methods Three primary indications for use Three primary indications for use Extrinsic stains from foods, smoking, coffee or tea Extrinsic stains from foods, smoking, coffee or tea Aged teeth Aged teeth Intrinsic stains (tetracycline stains and mild fluorosis Intrinsic stains (tetracycline stains and mild fluorosis

15 Typical Amalgam Tray Set-up Basic set-up Basic set-up Hand cutting instruments Hand cutting instruments Condenser Condenser Ball burnisher Ball burnisher Carvers Carvers Amalgam carrier Amalgam carrier Articulating paper/holder Articulating paper/holder

16 Set-Up Cont. HVE/saliva ejector HVE/saliva ejector Handpieces Handpieces Burs Burs Dental floss Dental floss Cotton rolls/holder Cotton rolls/holder Misc. Misc. Matrix band/retainer Matrix band/retainer Guaze squares Guaze squares Anesthetic set-up Anesthetic set-up Dental dam set-up Dental dam set-up

17 Matrix Systems Creates a temporary wall for amalgam, composite resin or IRM material Creates a temporary wall for amalgam, composite resin or IRM material Posterior Matrix systems Posterior Matrix systems Tofflemire retainer Tofflemire retainer Know the parts of the retainer and their function Know the parts of the retainer and their function Band Band Made of thin flexible stainless steel Made of thin flexible stainless steel Center of the band must be contoured(shaped) in the proximal surfaces for contact Center of the band must be contoured(shaped) in the proximal surfaces for contact

18 Matrix Cont. Wedges Wedges Class II restoration require wedges Class II restoration require wedges Placed on lingual embrasure Placed on lingual embrasure Various sizes and forms, wood or plastic Various sizes and forms, wood or plastic

19 Anterior Matrix Clear plastic Clear plastic Used with composite resin or glass ionomer Used with composite resin or glass ionomer Stainless steel matrix can scratch or mark the composite resin material Stainless steel matrix can scratch or mark the composite resin material Also referred to as celluloid strip or Mylar strip. Also referred to as celluloid strip or Mylar strip.

20 Automatrix System Alternative to the use of Tofflemire system Alternative to the use of Tofflemire system Does not use retainer to hold in place Does not use retainer to hold in place Bands are already formed Bands are already formed

21 Matrix Systems for Primary Teeth T-bands T-bands Copper band in shape of a T Copper band in shape of a T When formed the top of the band allows the straight portion to adjust and fit the circumference of the primary molar. When formed the top of the band allows the straight portion to adjust and fit the circumference of the primary molar.


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