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Journal of Periodontology|November 1, 1991
In vivo determination of radiographic projection errors produced by a novel filmholder and an x-ray beam manipulatorU Zappa, C Simona, H Graf, et al.Journal of Periodontology|April 1, 1993
Time-related changes of in vivo projection errors in standardized radiographsU Zappa, C Simona, H Graf, et al.Schweizer Monatsschrift Fur Zahnmedizin = Revue Mensuelle Suisse D'Odonto-Stomatologie = Rivista Mensile Svizzera Di Odontologia E Stomatologia|January 1, 1991
Episodic probing attachment loss versus pocket depth: bacterial morphotype associationsU Zappa, E Studer, C Simona, et al.Parodontologie (Berlin, Germany)|November 1, 1991
[Effect of electrically powered dental devices on cardiac parameter function in humans]U Zappa, M Studer, A Merkle, et al.Journal of Periodontology|July 1, 1990
Episodic probing attachment loss in humans: histologic associationsU Zappa, C Simona, P Schäppi, et al.Journal of Clinical Periodontology|August 1, 1991
Cell populations and episodic periodontal attachment loss in humansU Zappa, M Reinking-Zappa, H Graf, et al.Archives of Oral Biology|January 1, 1990
Comparison of serological and DNA probe analyses for detection of suspected periodontal pathogens in subgingival plaque samplesU Zappa, M Reinking-Zappa, H Graf, et al.Archives of Oral Biology|January 1, 1994
Self-applied treatments in the management of dentine hypersensitivityU ZappaParodontologie (Berlin, Germany)|November 1, 1990
[The episodic progression of untreated adult periodontitis]P Schäppi, U ZappaJournal of Periodontology|September 15, 1998
Nature and attachment of cementum formed under guided conditions in human teeth. An electron microscopic studyH U Luder, U ZappaPageof 47