Periodontal-Restorative Relationships
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| Class I | Pits and fissures.
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| Class II | Interproximal (premolars and molars).
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| Class III | Interproximal (incisors and canines) do not involve the line angle.
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| Class IV | Interproximal (incisor and canines) do involve the line angle
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| Class V | Cervical 1/3 of facial and buccal or lingual surface.
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| Class VI | Incisal edges if anteriors and cusps if the posteriors.
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| Emergence Angle | Angle formed by the amgle between the natural tooth structure and the restoration where they meet.
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| Luting Agent | Fills the space between two materials and or objects.
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| Restoration | A broad term applied to any material or prostheses that restores or replaces lost tooth structure, teeth, or oral tissues.
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| Cavity Preparation | The removal of caries altered tooth structure to render it capable of receiving a dental restoration.
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| Direct Restorations | Fabricated within the confines of the preparation, typically composed of materials that harden or polymerize after placement in the preparation.
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| Indirect Restorations | Those whoch are outside the tooth preparation, often from an impression and subsequent cast of the preperation.
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| Intrcoronal Restorations | Located within the confines of the cusps and normal proximal axial contour
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| Extracoronal Restorations | Outside or external to the crown portion of a natural tooth, includes vaneers
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| Microleakage | Imperfect interface between margins of restoration and tooth is often imperfect, allowing leakage of oral fluids
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| Gold | Pure has best for marginal quality, highly malleable, therefore lowest microleakage among those materials not bonded to the tooth.
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| Amalgam | Most commonly material without widespread deleterious effects, few problems mixed results on periodontal compatibility, have next ideal marginal interface to pure gold,when properly have decreasing marginal leakage as the restoration ages.
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| Composite Resins | BIS-GMA and inorganic filler materials, classified by size or size of fillers to help strengthen or reduce ware and reduce setting, shrinkage, and thermal expansion, used with acid etch for retension, can be dorect or indirectly
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| Glass Ionomers | Old silicates combined with polycarboxylate materials, also resin and others including fluoride wjen applied correctly it results in smooth surfave and good margins, used as bases and cements
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| Ceramics | Primarily glasses, extrememly stable, brittle, low thermal expansion, high strength and stiffness. Formed indirectly and used for inlays, crowns, and veneers, PFM, and acid retained restorations. Margins temd to distort more than when fused to metal.
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| Cast Metal Alloys | Indirect by themselves and with porcelain, usually classified by their mobility with gold and pallidum the most frequently used noble metals much diversity and variety available.
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| Inlay | An indirect filling, consisting of a solid substance as gold, porcelain, fitted to a cavity in a tooth and cemented into place
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| Primary Occlusal Trauma | Abnormal forces on healthy periodontium.
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| Secondary Occlusal Trauma | Normal or abnormal forces on already compromised periodontium
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| Therapy Occlusal Trauma | Splinting l, equilibration, hard night guard, habit control, orthodontics, restorative therapy that involves alteration of occlusal vertical dimension
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| Prophy Jet ( Sand Blaster) | Increased potential for promblems, good for both tooth surface not so well for surfaces of restorations
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