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Published on : Mar 29, 2020 | Views : 2016 | Downloads : 12

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Slide 1-

Pontics Definition Requirements Design Pretreatments assessment Types Fabrication
Slide 2-

Definition Pontic GPT : An artificial tooth on a fixed dental prosthesis that replaces a missing natural tooth, restores its function, and usually fills the space previously occupied by the clinical crown
Slide 3-

Definition Acc to Tylman –pontic is the suspended member of a fixed partial denture. it replaces the lost natural tooth, restores function ,and occupies the space of the missing tooth.
Slide 4-

Ideal requirements of pontics Smooth surfaced and convex in all directions Easily cleansable Pinpoint pressure free contact on the ridge No irritation to the gingival tissues
Slide 5-

Ideal requirement of pontics Facilitate plaque control Emergence profile Strength and longevity Be esthetic
Slide 6-

Ideal requirements of pontics Restore function No abutment overloading Color stable
Slide 7-

Functions of pontics Mastication Speech Esthetics
Slide 8-

Considerations for a successful pontic design
Slide 9-

Biologic considerations Ridge contact Area of contact with ridge should be small and convex.
Slide 10-

Oral hygiene considerations
Slide 11-

Pontic materials
Slide 12-

Differences in the plaque-retaining capacities of.samples of a Type III gold, gold for veneering with porcelain, a vacuum-fired bonded porcelain Veneer, and an acrylic resin. After 48 hours in vivo, the Ceramco metal and Type III gold specimens accumulated significantly more dark stains than acrylic ones Wise. M et al and Dykema .R, The plaque-retaining capacity of four dental materials,J Proshtet 1975;33:178
Slide 13-

Occlusal forces Reduce buccolingual width – 30% to lessen occlusal forces 12% increase in chewing efficiency Pontics with normal occlusal widths – in the occlusal third area
Slide 14-

Mechanical considerations Improper choice of materials Poor framework design Poor tooth preparation Poor occlusion
Slide 15-

It can be seen that the maximum tensile stress at the solder joint, mesial to the second molar and above the gingiva, was reduced from2,400 p.s.i, in the conventional pontic to 1,200 p.s.i, in the sanitary pontic and finally to 720 p.s.i, in the modified sanitary pontic. For the solder joint distal to the second premolar, also above till gingiva, the reductions were in the order of 1,920 (C.P.)to 960 (S.P.) to 720 p.s.i. (M.S.P.). Hood, J. A. Stress and deflection of three different pontic designs. J Prosthet Dent 33:54-59, 1975
Slide 16-

Esthetic considerations
Slide 17-

Incisogingival length Root can be stained to simulate exposed dentine. Pink porcelain to simulate the gingival tissues
Slide 18-

Mesiodistal width Space discrepancy – less problem in posteriors
Slide 19-

Mesiodistal width Orthodontic treatment Pontic of abnormal size- illusion of natural tooth
Slide 20-

Pretreatment assessment Diagnostic cast Wax up
Slide 21-

Pontic space Individual crowns of increased proximal contours were preferred to an FPD with undersized pontics
Slide 22-

Residual ridge contour Loss of residual ridge contour leading to unesthetic open gingival embrasures Food entrapment
Slide 23-

Residual ridge contour Class II defect. Class I defect. Class III defect. Sieberts classification
Slide 24-

Residual ridge contour Abrams et al showed Class I defects to constitute 32.4% Class II- 2.9% Class III- 55.9% 8.8% having no defects
Slide 25-

Surgical management of class I defect Pouch technique
Slide 26-

Surgical management of class I defect Pouch technique
Slide 27-

Surgical management of class II and III defect Interpostional graft
Slide 28-

Surgical management of class II and III defect onlay graft
Slide 29-

Gingival architecture preservation
Slide 30-

Classification 1. Depending on shape of surface contacting the ridge(Tylmann) Sanitary Modified sanitary Spheroidal Saddle Ridge lap Modified ridgelap Ovate
Slide 31-

2.According to Rosenstiel depending on mucosal contact A. mucosal contact ridge lap modified ridge lap ovate conical B. No mucosal contact sanitary(hygenic) modified sanitary
Slide 32-

3.According to the form(Johnston) Sanitary or Hygenic Anatomic type 4.Based on materials used Metal Metal and porcelain Metal and resin
Slide 33-

5.Prefabricated pontics Flat back Trupontic Longpinfacing Pontips Reverse pin facings
Slide 34-

Sanitary or hygienic
Slide 35-

Modified sanitary pontic
Slide 36-

Ridge lap pontic
Slide 37-

Modified ridge lap pontic
Slide 38-

Conical pontic
Slide 39-

Ovate pontic
Slide 40-

Modified ovate pontic Contact more labially than ovate pontic Easier to clean No need of surgical augmentation Push the labial gingival margin away to floss Liu.S,J Esthet Restor Dent 16:273-283, 2004
Slide 41-

Residual ridge contour To determine the frequency and the nature of tissue reactions of underlying residual ridge mucosa to specific pontic designs, and To compare the frequency and the nature of tissue reactions of residual ridge mucosa to various materials used in pontic construction. Stein.R.S , Pontic residual ridge relationship, J Proshtet Dent 1966;16: 251-285
Slide 42-

ppt slide no 42 content not found
Slide 43-

Metal Ceramic pontics Uniform veneer of porcelain- 1.2 mm Metal surface – smooth and free of pits Round angles Occlusal centric contacts – 1.5 mm away from junction
Slide 44-

Metal ceramic pontics wax the prosthesis
Slide 45-

All ceramic pontics
Slide 46-

Resin veneered pontics
Slide 47-

Fiber reinforced composite resin pontics
Slide 48-

Pontic fabrication All metal hygienic pontic Metal ceramic pontic
Slide 49-

Armamentarium Sable brush Plaster bowl Spatula Quick setting plaster Bunsen burner PKT waxing instruments- No 1,2,3,4,5 Beavertail burnisher No 7 wax spatula Inlay casting wax Die lubricant Cotton pliers Hollow plastic sprue      
Slide 50-

All metal hygienic pontic fabrication
Slide 51-

All metal hygienic pontic fabrication
Slide 52-

All metal hygienic pontic fabrication
Slide 53-

All metal hygienic pontic fabrication
Slide 54-

All metal hygienic pontic fabrication
Slide 55-

Metal ceramic pontics Requirements Adequate bulk of metal Uniform thickness of porcelain Continuous strip of metal on lingual surface
Slide 56-

Scalloped or trestle design Connector is diminished in faciolingual dimension – Indication Bulk or rigidity in connector areas Tissue contact – modified ridge lap
Slide 57-

Metal ceramic pontics To produce continuous contour and uniform thickness of porcelain – fabricate wax pattern to full contour and cut back Fabricate the copings – No 7 wax spatula Blue inlay wax stick – edentulous area
Slide 58-

Metal ceramic pontics Check the alignment in a mesiodistal and the facial profile
Slide 59-

Metal ceramic pontics
Slide 60-

Metal ceramic pontics
Slide 61-

Available pontic systems
Slide 62-

Review of literature Kumbulolu.O et al, A Different Pontic Design for Fiber-Reinforced Composite Bridgeworks: A Clinical Report, Eur J Dent. 2007 January; 1(1): 50–53.
Slide 63-

Review of literature Kim.T.H.Yet al, Simulated tissue using unique pontic design, J Prosthet Dent 2009;102:205-210
Slide 64-

References Malone W.F.P., Koth D.L., Cavazos E. : Tylman’s theory of practice of fixed prosthodontics. 8 Ed., lshiyaku publications, 1993,357-370 Rosenstiel R.F., Land M.F., Fujimot J.: Contemporary fixed prosthodontics. 4th Ed., Mosby Publications, 2007, 616-648
Slide 65-

References Shillingburg H.T., Hobo S., Whisett L.D., Jacobi R., Brackett S.E. Fundamentals of fixed prosthodontics, 3 Ed., Quintessence Publication,2007,India ,485-506 Stein.R.S , Pontic residual ridge relationship, J Proshtet Dent 1966;16: 251-285
Slide 66-

References Wise. M et al and Dykema .R, The plaque-retaining capacity of four dental materials,J Proshtet 1975;33:178 Liu.S ,Use of a modified ovate pontic in areas of ridge defects: A report of 2 cases, J Esthet Restor Dent 16:273- 283, 2004
Slide 67-

References Kumbulolu.O et al, A Different Pontic Design for Fiber-Reinforced Composite Bridgeworks: A Clinical Report, Eur J Dent. 2007 January; 1(1): 50–53. Kim.T.H.Yet al, Simulated tissue using unique pontic design, J Prosthet Dent 2009;102:205-210
Slide 68-

References R.Duane Douglas ,Pontic design FPDpontic wax up .ppt FPD.ppt