A soluble polyaniline (PANi) was synthesized by modifying with a photolabile, acid-labile, and thermolabile tert-butoxycarbonyl (t-BOC) group in this study. The prepared PANi(t-BOC) is highly soluble and thermodynamically stable in low-boiling solvents such as THF, dioxane, and CHCl 3. This soluble form of PANi(t-BOC) was converted to the insoluble and electrically conductive emeraldine salts upon photodoping with only a catalytic amount of photoacid generators such as N-(tosyloxy)-or (camphorsulfonyloxy)norborneneimide or -onium salts. As a result of this solubility difference, conducting patterns of high resolution were produced by conventional photolithography process. Further, upon removal of the t-BOC groups in PANi(t-BOC) by acid doping, no obvious morphology change of the films was observed, and such conversion recovered the original conductivity level of the doped PANi. Since the t-BOC protecting groups are easily removed in doping or acid-catalyzed reaction by chemical amplification or thermal bake, the PANi(t-BOC) can be used as conductive matrix polymers for negative type photoimaging or printing materials or for novel solution-processed applications in various microelectronic devices.

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Reconstruction of the maxillectomy with an obturator is to restore masticatory, swallowing, phonetic and esthetic problems. Stress created by lateral forces is minimized by the proper selection of an occlusal scheme, elimination of premature occlusal contacts, and wide distribution of supporting area. It should be considered that properly designed retainers reduce the stresses transmitted to the abutment while the obturator is in function. The following clinical report presents palatal obturator treatment with implant assisted removable partial denture (IARPD) design that restores normal function and esthetics in patients who experienced maxillectomy and dental implant failure. (J Dent Rehabil Appl Sci 2016;32(4):322-9)