Karl Martin Lehmann

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BACKGROUND This preliminary in vitro study, presented at the General Session of the International and American Association for Dental Research in 2010 (Barcelona, Spain), evaluates whether three-dimensional (3D) optical scanning and subsequent superimposing procedures could be used for reproducible volumetric evaluation of gingival recession. METHODS(More)
OBJECTIVES The objective of this study was to compare the L*C*h° color coordinates of dental color-measuring devices with those of a spectrophotometric reference system. METHODS The International Commission on Illumination (CIE) L*C*h° color coordinates of ceramic samples, matching the colors of the VITA Linearguide, were recorded using four(More)
The aim of this study was to analyze the influence of four CAD/CAM all-ceramic materials on cell viability, migration ability and adenylate kinase (ADK) release of human gingival fibroblasts (HGF) and oral keratinocytes (HOK). HGF and HOK were cultured on disc-shaped CAD/CAM all-ceramic materials (e.max CAD LT, e.max CAD HT, Empress CAD and Mark II) and on(More)
The reproducibility of electronic color-measuring devices used in dentistry refers to the consistency of measurements of a single device and also that between identical devices. This in vitro study evaluated the short-term interdevice agreement of eight equivalent dental measurement devices. The short-term repeatability of eight identical VITA Easyshade(More)
Endothelial cells play an important role in peri-implant angiogenesis during early bone formation. Therefore, interactions between endothelial progenitor cells (EPCs) and titanium dental implant surfaces are of crucial interest. The aim of our in vitro study was to investigate the reactions of EPCs in contact with different commercially available implant(More)
S c h i f f hat bekannt gemachtl), dass wenn man einem Hunde die Hypoglo~si durchschneidet, nach Verlauf yon 4--6 Tagen fibrilliire Zuckungen in der Zunge auftreten, welche~ nach seiner Angabe, im Anfang (d. h. vom 8.--12. oder 14. Tag) dutch Reizung des Lingualis zum Abnehmen und Verschwindcn gebracht werden kiinnen. Sp~ter (d. h. 15--18 Tage nach der(More)
This study aims to investigate the early outcome of a dental implant with bioactive calcium–phosphate (CaP) coating in the first year of usage in different clinical indications in partially edentulous patients, after early and delayed prosthetic loading. Therefore, in a prospective follow-up study, the cumulative survival and success rate of a conical,(More)
OBJECTIVES This in vitro study evaluated the accordance of dental color measurement devices with a Commission Internationale de l'Eclairage (CIE)-compliant reference system, by comparing the CIE lightness, chroma, and hue (L*C*h°) color coordinates of ceramic samples. METHODS Four color measurement devices: Vita Easyshade® Advance (A); DeguDent(More)
PURPOSE To evaluate factors promoting mucositis and peri-implantitis (plaque accumulation, poor peri-implant soft tissue health, bone loss) with regard to prosthetic attachment systems consisting of implant-supported bar-retained overdentures. MATERIALS AND METHODS Patients who received TiOblast implants to support overdentures retained by either (1)(More)