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The aim of this study was to evaluate microbiological findings and aMMP-8 level of peri-implant mucositis (M) and peri-implantitis (P) in patients undergoing supportive implant therapy (SIT). Eighty-nine patients with 171 implants were included. The case definitions were as follows: M: PPD ≥4mm, BOP; P: PPD≥4mm, BOP, radiographic bone loss ≥3.5mm. Samples of peri-implant sulcular fluid (PISF) were taken from all peri-implant pockets at each implant to detect periodontal pathogens using PCR and aMMP-8 level with ELISA. Only Treponema denticola (Td) and Prevotella intermedia (Pi) showed significantly higher prevalence in P (healthy implants [HI]: Td=27%, Pi=17%; M: Td=26%, Pi=15%; P: Td and Pi=50%; P0.05). The mean aMMP-8 level at implant sites did not show any significant difference (P=0.05) among HI (5.2±8.1), M (9.9±19.0), and P (4.9±7.7). Microbiological findings and aMMP-8 levels are not reliable criteria to distinguish between HI, M, and P in patients undergoing SIT.

This article provides the first test results of a fired four cylinder gasoline engine with the new fully variable valve timing system “Univalve”. This variable valve actuation system is under development by the Hilite / Hydraulik-Ring company for series production engines. The basic investigations are taking place at the University of Kaiserslautern at the institute of combustion engines. Only by changes at the intake valve train, the fuel consumption could be improved by 13 % compared to the otherwise identical basic engine. Essential engine functions like torque and emissions were also clearly improved.

Dieser Beitrag stellt die ersten Versuchsergebnisse eines Vierzylindermotors mit der neuen vollvariablen mechanischen Ventilsteuerung „Univalve“ dar. Sie wird von Hilite/Hydraulik-Ring fur Serien-Verbrennungsmotoren entwickelt; wesentliche Untersuchungen werden an der Technischen Universitat Kaiserslautern durchgefuhrt. Nur durch Anderungen an der Einlassventilseite konnte gegenuber dem ansonsten identischen Basismotor der Verbrauch um bis zu 13 % gesenkt werden. Wesentliche Motorfunktionen wie der Drehmomentverlauf oder das Emissionsverhalten wurden ebenfalls verbessert.