Finishing and polishing of dental restorations
surface roughness
hermal stimuli: The effective thermal stimulus is that which occurs at the DEJ at the site of neural excitation. Therefore, pain continues after removal of the stimulating object and until change at the DEJ becomes of a sub-threshold value for pain perception. • Osmotic stimuli: When osmotic agents as concentrated sugar adhere to margins of leaky restoration or contact dentin they affect a flow of dentinal fluid with elicitation of pain.
•remains sensitive for several weeks, it may be assumed that the pulp cap has failed. A direct pulp cap is considered to be successful if the tooth is asymptomatic and gives a positive vitality test from 3 - 6 months later.
13. Gingival response to operative procedure: Chemical tissue packs used to facilitate taking the elastic impressions may cause considerable soft tissue irritation, particularly if the tissue packing pressure is too great or the pack is left in place for too long. OneGloss Set (Shofu) Brush: Goat-hair brush (Micerium)
• An interim dressing If acrylic temporaries are not trimmed and finished to their margins, the excess acrylic or cement used to set them may cause a retraction of the gingival margin.
• Cementing media left in the gingival crevice may cause gingival irritation ranging from mild to severe inflammation. Careful checking and cleansing of the cervical area are essential as a last step in the setting of a casting.
• An overhang may irritate the gingival tissues to such a degree that the patients will complain. A composite resin restoration, improperly finished, may have a cervical flash extending several millimetres beneath the gingiva. Amalgam overhangs in the posterior area may not resemble an acute situation, but the irritation may result in both soft tissue and alveolar bone loss, depending on the severity of the overhang and the response of the supporting structures.
• The over-contoured interproximal restorations will apply a pressure to the gingival papilla, producing a chronic inflammation and leading to hyperplasia or eventual loss of gingival tissue. • Over-contoured buccal and lingual restorations will also apply pressure to the gingiva, in addition, they contribute to poor gingival health by preventing thorough cleansing of the area by natural or artificial means.
14. Leaking restoration (microleakage): No restorative material can provide a completely hermetic seal of the cavity wall. Although properly constructed amalgam restoration exhibits clinically satisfactory adaptation that even improves on aging due to the deposition of the corrosion products at the interface, yet at least some leakage may occur at various degrees.
• The ingress of fluids can be the cause of postoperative pain or hypersensitivity not only its contents גשר שיניים (irritant constituents and oral microbes), but also by effecting fluid movement in dentin. Similarly the dissolution of luting cement under a cast restoration will cause fluid movement. दंत सेतु This problem is obvious in the case of the resin composite restorations due to the polymerization shrinkage and the difference in the coefficient of thermal expansion and contraction between the tooth structure and the resin material. 歯科用ブリッジ
5th Assignment : •Clinical technique of class II composite restoration Question: “Comparison of class II amalgam and composite restoration
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