• Willkommen in der Zahnarztpraxis OXIDIO Dr. Winkelmann in Gärtringen


Going to the dentist is simply not the same as doing groceries. We know that. That is why we care so much about making your stay at our practice as comfortable as it gets. On this page, we would like to introduce our team to you. So that when you come to see us next time, you will already know all the staff you are going to meet at our practice.

We enjoy training dedicated young people. On a regular base we are hiring promising talent. Therefore you will get to know new and friendly staff members from time to time.

We are very proud of our young and competent team. A friendly work atmosphere in our practice is of great importance to us. That begins with a pleasant experience at the front desk and is followed by comfortable treatment and smooth processing of payment and insurance matters.

Dentist Lukas Winkelmann, DMD


Lukas Winkelmann, DMD

Since July 2019, Lukas Winkelmann, DMD, has been strengthening the practice alongside his father. After graduating from high school, Lukas Winkelmann studied dentistry at UPenn in Philadelphia, USA.

Dentist Jacob Notz


Jacob Notz

Jacob began his career after graduating from high school as a dental technician. Even during his subsequent studies in dentistry, he continued to work, always deepening his knowledge in the field of CAD / CAM and in 3D printing.

Jacob is a third-generation dentist in his family. In his spare time, he enjoys good food and sports activities.

Dentist Dr. Winkelmann


Dr. Winkelmann

Dr Winkelmann has been working as a dentist since 1980 and was also active in professional politics for several years. In his work, the well-being of his patients is the top priority.

Harvey Lum praktizierte in einer Privatpraxis in Los Angeles woraufhin er über 30 Jahre im zahnmedizinischen Bereich der U.S. Army tätig war.

Contact person for US patients

Harvey Lum DDS

Born in Hawaii, Harvey Lum went into private practice in Los Angeles and spent over 30 years in the U.S. dental field. Army was active.

Dental Hygienist Susanne Brändle

Dental Hygienist

Susanne Brändle

Susanne has been part of the OXIDIO team since spring 2009. She was trained at the “Royal Dental College” in Denmark and learned advanced content in Stuttgart and Zurich. With over 20 years of professional experience, she is the backbone of periodontal therapy in our practice. Our dentists appreciate her professional attitude and our patients love her warm and natural manner. Susanne is married and has two children.

Verena Kirn

Dental Hygienist

Verena Kirn

Verena was by far the best apprentice the practice has had in the many decades of its existence. Just two months after starting her apprenticeship, she was Dr. Winkelmann senior’s personal assistant for all treatments. Verena has an incredibly quick grasp of things. In other words, nothing had to be said twice!

She graduated as a dental assistant in 2006, after which she completed all the advanced training courses to become a dental prophylaxis assistant and then a dental hygienist. And these advanced training courses are anything but fun: months of just working – learning – sleeping. Nothing else! In 2012, the time had finally come: she graduated as a DH! And the whole practice was really proud that she had made it!

Verena is married to Moritz and has two wonderful children.

Lorri McCallum

Registered Dental Hygienist

Lorri McCallum

Lorri grew up in a small town in Texas. After studying dental hygiene at Lamar University, she moved to Houston. There she worked as a Registered Dental Hygienist while also studying business. She is a really clever woman with a weakness: Linder balls!

Lorri leaves behind three sons, two daughters-in-law and her beloved German shepherd in Texas.
In her spare time, she devotes herself to literature, is a lifelong learner and is passionate about traveling through Europe, discovering history, culture, landscapes, new friends and good food.

She is fulfilling a lifelong dream of living in Germany and is thrilled to be a member of the Oxidio team!

Patient care, marketing/social media

Lena Morgan

Lena’s job is to look after our US patients and networking. She also takes care of the internal and external communication of our practice. She is bursting with ideas and creativity. She is the mind behind the photos, which “our” photographer Dirk Kittelberger then turns into pictures.

Lena was born in the Czech Republic. After finishing school, Lena emigrated first to Germany and later to London. In London, she worked for a private investment bank for many years. Lena recently moved to live near the Kennedy Space Center in Florida. In addition to her family, she enjoys the outdoors and walking her three dogs.

Dental Specialists Sonja Wirth

Trained Dental Assistant / Dental Specialist

Sonja Wirth

Sonja… now an institution in our practice. Patients have the impression that Dr. Winkelmann Sr. and Sonja have been treating each other like a well-rehearsed couple for decades. But yes… they’re right, even though Sonja only joined our team in the fall of 2018. She has over 30 years of professional experience and lots of further training, e.g. in nitrous oxide assistance, hygienic medical device preparation, group and individual prophylaxis, impressions, creating temporary restorations, etc. Not to mention her special empathy.

Sonja organizes the practice together with Silke. And Sonja is always in a good mood, bubbly and smiling. On Mondays, we are happy that the weekend is over and we can finally work with Sonja again. – She is married and has two sons.

Silke Betz

Office Manager

Silke Betz

Silke studied business administration with a focus on healthcare management, which she completed in 2014 with a Bachelor of Arts. She then worked in a hospital, a therapy center and, since 2018, in a dental practice, where she also completed an IHK further training course to become a practice manager. She joined our practice in spring 2024 and works at reception.

No matter how stressful it gets at times at reception, Silke is our organizational talent, keeps calm and maintains an overview. She is very communicative and particularly enjoys dealing with people in her day-to-day work. Silke is married and has two children. In her free time, she loves reading, traveling and doing sports. She also plays the zither, an instrument that is rarely played today.

Trained dental assistants Corinna Schlotterbeck

Trained Dental Assistant

Corinna Schlotterbeck

Corinna completed her training as a dental assistant in 1997 in the practice of Dr. Winkelman. This was followed by various further training courses, including group and individual prophylaxis.

Corinna knows the practice like no other. She can do almost any job. She currently does professional teeth cleanings and ensures that hygiene standards are maintained.

Administrative staff Renée Bohlken

Chief of Administration

Renée Bohlken

Renée has been part of the team since spring 2010. She works in administration on the first floor, where she manages contacts for Dr. Winkelmann organizes and schedules appointments and lectures. She also takes care of pretreatment estimates and prepares the invoices for our US patients. She mostly works from home. Renée is married and has two daughters.

Melanie Aquino


Melanie Aquino

Melanie has been a nurse since 2021 and received her nursing education at the University of Colorado Springs. 

Melanie is Part of the team since fall 2023. She receives additional training in dental assisting from all dentists and the entire team in our practice. Her main task is to assist Lukas E. Winkelmann, DMD, with all treatments. With all her esprit, Melanie is a real asset to the team.

Melanie is also a military wife and has lived in Stuttgart area for year and enjoys exploring Europe on her down time !

Data Protection Officer Chris Redel

Data Protection Officer

Chris Redel

Chris Redel has been in charge of our practice’s IT for over 25 years. And that very successfully and very reliably. With us there is almost nothing “off the peg”. Almost everything was put together and built individually by Chris.