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37 4 2016 laser events | special applications. The activities of RWTH Aachen UniversityprovedaspecialcaseofluckfortheGerman laserusersindentistry,asProf.DrGutknechtandProf. Dr Angelika Lampert promoted scientific, evidence- based standards early on, thus providing credibility to the then-young discipline of laser dentistry. Theseeffortswereawardedwithacceptanceofthe DGL by the DGZMK (German Society for Dental and Oral Medicine), which must be seen as one of the highlights of DGL’s 25-year-old history. The congress makers payed special tribute to this unique success story on the first congress day themed“FromtheoriginsoftheDGLtonewhorizons”. DGL international Almost 50 per cent of the speakers on this first congress day had travelled to Munich from abroad, which speaks for DGL’s international attractiveness. As the DGL is among the world’s oldest dental soci- etiessuchasthoseinJapanandBrazil,thecongress’ list of speakers read like the Who is Who of interna- tional laser dentistry. Dr Kenneth Luk from Hong Kong started the inter- national contributions with his speech on the influ- ence of different pulse durations on the microstruc- ture of titanium implants. As is shown by the latest S3-Guideline “Periimplantitis” of the DGZMK and a number of implantological dental societies, the Er:YAG laser more and more forms the central part of laser applications in implantology. The predominance of hard-tissue lasers (Er:YAG and Er,Cr:YSGG) in the scientific programme of the firstcongressdaywasnoteworthy,withconservation forming the focal point of the contributions (Dr Riman Nasher, Sannaa, „Entfernung des Smearlayers mitdemEr,Cr:YSGG“,DrAnaNogueiradaSilva,Lissa- bon, „Composite auf laservorbereitete Zahnober- flächen“ , Dr Berchem Kalender, „Präparation im Hartgewebe“ and Dr Tamara Al. Karadaghi, Bagdad, „Dentinpermeabilität nach Laserbestrahlung“). Basic research The influence of laser wavelengths which are able to remove dental hard tissue and bone tissue on implant surfaces was discussed controversially. A working group from Aachen, Germany, led by Prof. Dr GutknechtandDrFahlstedtsucceededinarguingthat Er;CR:YSGG laser light will not cause root surface changesevenatanirradiationof0.75and1Watt.The second “hard tissue wavelength”, the Er:YAG laser, was investigated by another working group led by Dr Luk, with an energy density of 10.6 J/cm2 leading to irreparable damages of the implant surface. A very active working group formed by DGL vet- eran Dr Michael Hopp (Berlin, Germany) attested that 445 nm diode lasers, Er:YAG lasers and CO2 la- sers played only a minor role in tissue damages fol- lowing laser cutting, whereas Nd:YAG lasers and di- odelasersofawavelengthof810and980 nmcaused pronounceddamagezoneswithcontinuedbleeding attheincisionmargins.Conclusion:healingincluded an (desirable) primary healing prompted by Er:YAG laser application as well as a defect healing caused by other laser types (which should be avoided). News from the realm of wavelengths Prof. Dr Matthias Frentzen (Bonn, Germany), who has been among Germany’s most important mem- bersoftheDGL,hasbeenthesociety’sgeneralsecre- taryformanyyears.Healsohasbeendoingresearch onthedevelopmentshort-pulselaserapplicationsin dentistry, which is why he decided to contribute a concise overview to the congress speeches. The audience proved receptive for Prof. Frentzen’s main message: research and development of new ul- trashort-pulsed lasers, which will replace the more complicatedandlessefficientexcimer-lasersinthere- movalofdentalhardandbonetissues,hasbeenaccel- erated in such a way that soon high-performance and compactshort-pulselasersourceswillbeavailable.The associatedfindingswillhaveapositiveinfluenceonthe furtherdevelopmentofEr:YAGandCO2 lasers. Fig. 1: A large audience presented at the two-day event on Munich’s last Oktoberfest weekend. Fig. 2: On Friday, 30 September, long-standing DGL members were awarded a certificate for their dedication, among them also Prof. Dr Norbert Gutknecht and Prof. Dr Mathias Frentzen. Fig. 3: Parallel to the 25th anniver- sary congress, LASER START UP 2016 was held. Its scientific leader Dr Georg Bach opened the traditional education event on Friday. Fig. 4: Dr Detlef Lutz and Dr Angela Wilke-Lutz were also among the awardees for long- standing membership. Fig. 3 Fig. 4 42016