Rainer Haak | Faculty of Medicine / University Hospital Leipzig (original) (raw)

Papers by Rainer Haak

ZWR - Das Deutsche Zahnärzteblatt, 2008

Biomedizinische Technik/Biomedical Engineering, 2000

Quintessence international (Berlin, Germany : 1985), 2000

Intraoral conditions, which in the course of dental treatment are subject to change, can be recor... more Intraoral conditions, which in the course of dental treatment are subject to change, can be recorded in detail by means of photography. Pictures provide an improved documentation and the option of monitoring particular situations over longer periods of time. We propose a standardized preoperative 35-mm photographic series. For intraoral photography, special intraoral mirrors and lip-and-cheek retractors are modified as needed. Macro 35-mm cameras with macro flash are by now well-established. Such equipment combined with the technique outlined in this report make standardized photographic documentation possible without mouth-angle retractors and mirror rims obstructing the view.

European Journal of Oral Sciences, 2000

European Journal of Oral Sciences, 2002

Dentomaxillofacial Radiology, 2003

Objectives: To evaluate the validity of approximal caries detection on digital bitewing radiograp... more Objectives: To evaluate the validity of approximal caries detection on digital bitewing radiographs displayed at different image sizes on either a cathode ray tube (CRT) monitor or a thin film transistor (TFT) monitor. Methods: Five observers assessed digital radiographs of a charge-coupled device (CCD)-based sensor system (Sidexis w ) of 160 unrestored premolars and molars for approximal caries using a six category caries rating scale. Images were displayed at ratios of 1:1, 1:2 and 1:7 on a CRT monitor (Nokia 446 XS) and a TFT display (Panasonic LC 50S). Histological assessments of serial sections were used as the validation standard. Diagnostic accuracy was expressed as area under the receiver operating characteristic (ROC) curve (AUC) and was calculated at two levels of caries penetration: presence of caries (I) and presence of a lesion in the dentine (II). The influence of the factors "monitor type", "image size" and "validation threshold" were analysed with repeated measures analysis of variance. Results: The ROC curve areas for approximal caries detection at both histological penetration levels were not influenced by the type of monitor display, whereas image size had a significant impact (P , 0.01). AUCs for image size 1:7 (I, 0.62; II, 0.65) were smaller compared with ratios of 1:1 and 1:2 (P , 0.01). No differences were observed between image size ratios 1:1 (I, 0.69; II, 0.74) and 1:2 (I, 0.68; II, 0.73). Conclusions: In this study, the type of monitor did not influence approximal caries detection on digital radiographs. Image sizes with a display ratio of 1:1 and 1:2 resulted in better diagnostic validity than those with a ratio of 1:7.

Dentomaxillofacial Radiology, 2002

Objectives: To determine the in¯uence of ambient lighting on grey-scale perception using a cathod... more Objectives: To determine the in¯uence of ambient lighting on grey-scale perception using a cathode-ray tube (CRT) and a thin ®lm transistor (TFT) computer display. Methods: A cathode ray tube (Nokia XS 446) and a liquid crystal display (Panasonic LC 50S) were used at reduced room lighting (70 lux) and under conditions recommended for a dental operatory (1000 lux). Twenty-seven observers examined twice a modi®ed SMPTE test pattern [0 to 255; 255 to 0] grey-scale values. The corresponding contrast dierences were allocated to four ranges of grey levels (I: 0 ± 63; II: 64 ± 127; III: 128 ± 191; IV: 192 ± 255). The in¯uences of monitor type, grey-scale range and illumination were evaluated by means of repeated measures analysis of variance. Results: Detection of dierences in monochromatic intensity was signi®cantly earlier with reduced lighting (P50.0001). When full ambient lighting was used, the TFT display was superior compared to the CRT monitor in ranges II and III (P50.0001), whereas no dierences could be detected for grey intensities between 0 and 63 (P=0.71) and between 192 and 255 (P=0.36). Conclusions: Background lighting hampers grey-scale perception on computer displays. In this study of one TFT and one CRT monitor, the TFT in full ambient lighting was associated with earlier detection of grey scale dierences than CRT.

Dental Materials, 2005

ABSTRACT To assess the antimicrobial effect of acid etching or a triclosan-containing compomer on... more ABSTRACT To assess the antimicrobial effect of acid etching or a triclosan-containing compomer on the cultivable microflora of incompletely excavated dentinal carious lesions. Thirty detinal lesions were opened with a diamond burr. Subsequent to removal of the softened biomass a sample of dentin was taken from the cavity floor with a round bur. Ten cavities each were treated with 36% phosphoric acid (PH) for 15s, covered with a triclosan-containing compomer (TC) or received no treatment as control (CO). All lesions were restored with a compomer composite. Sampling was performed directly after etching in the PH group and at re-entry after 6 weeks in all groups. Aliquots were plated on blood agar and selective media for Lactobacilli (Rogosa) and mutans Streptococci (MSB). Cultures were incubated anaerobically for 7 days at 37 degrees C prior to quantitative assessment and biotyping of the isolates. Application of phosphoric acid resulted in initial reduction of the totally cultivable microflora (p=0.006). Evaluation of the total number of cultivable microflora after 6 weeks revealed no differences between the groups (p>0.05). Lactobacilli counts were significantly lower in the TC group compared to the PH and CO groups (p<0.05). No difference was detected between the PH and CO groups after 6 weeks. Phosphoric acid initially reduces the number of microorganisms in carious dentin but not in the longer term. The experimental triclosan composite suppresses Lactobacilli species over a period of 6 weeks.

Patient education and counseling, 2013

Objective: To develop learning objectives for a core communication curriculum for all health care... more Objective: To develop learning objectives for a core communication curriculum for all health care professions and to survey the acceptability and suitability of the curriculum for undergraduate European health care education. Methods: Learning objectives for a Health Professions Core Communication Curriculum (HPCCC) in undergraduate education were developed based on international literature and expert knowledge by an international group of communication experts representing different health care professions. A Delphi process technique was used to gather feedback and to provide a consensus from various health care disciplines within Europe. Results: 121 communication experts from 15 professional fields and 16 European countries participated in the consensus process. The overall acceptance of the core communication curriculum was high. 61 core communication objectives were rated on a five-point scale and found to be relevant for undergraduate education in health care professions. A thematic analysis revealed the benefits of the HPCCC. Conclusions and practice implications: Based on a broad European expert consensus, the Health Professions Core Communication Curriculum can be used as a guide for teaching communication interand multi-professionally in undergraduate education in health care. It can serve for curriculum development and support the goals of the Bologna process. ß