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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
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.
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
Ideal requirement of pontics Facilitate plaque control Emergence profile Strength and longevity Be esthetic
Ideal requirements of pontics Restore function No abutment overloading Color stable
Functions of pontics Mastication Speech Esthetics
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 onesWise. M et al and Dykema .R, The plaque-retaining capacity of four dentalmaterials,J Proshtet 1975;33:178
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
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 ProsthetDent 33:54-59, 1975
Modified ovate pontic Contact more labially than ovate pontic Easier to clean No need of surgical augmentation Push the labial gingival margin away to flossLiu.S,J Esthet Restor Dent 16:273-283, 2004
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
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
Metal ceramic pontics Requirements Adequate bulk of metal Uniform thickness of porcelain Continuous strip of metal on lingual surface
Scalloped or trestle design Connector is diminished in faciolingual dimension – Indication Bulk or rigidity in connector areas Tissue contact – modified ridge lap
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
Metal ceramic pontics Check the alignment in a mesiodistal and the facial profile
Available pontic systems Advantages Disadvantages Indications ContraindicationsMetal Esthetics Difficult if Most Long span withceramic Biocompatible abutment not situations high stress metal ceramicAll metal Strength Non esthetic Mandibular Esthetics Straightforward molars, procedure under high bite forceFibre Conservative Limited to short Esthetics Long spanreinforced with inlays spansall resin EstheticsFacings Rarely used Rarely used Rarely used Rarely used
Review of literatureKumbulolu.O et al, A Different Pontic Design for Fiber-Reinforced Composite Bridgeworks: A Clinical Report, Eur J Dent. 2007 January; 1(1): 50–53.
Review of literatureKim.T.H.Yet al, Simulated tissue using unique pontic design, JProsthet Dent 2009;102:205-210
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
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
References Kumbulolu.O et al, A Different Pontic Design for Fiber-Reinforced CompositeBridgeworks: 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
References R.Duane Douglas ,Pontic design FPDpontic wax up .ppt FPD.ppt