Professional career

Study of dentistry at the Albert-Ludwigs-University of Freiburg Degree: State Examination

Licensed as a dentist

Research associate at the Albert Ludwig University, Department of Dental Prosthetics, Prof. Dr. Dr. J.R. Strub

Doctorate in dentistry ("magna cum laude")

Two-year advanced training in the field of oral implantology, German Society for Implantology (DGI).

Two-year advanced training in the field of esthetic dentistry, German Society for Esthetic Dentistry (DGÄZ).

Since 2012:
Dentist in the practice of Dr. Ralf Quirin, Freiburg

2013- 2015:
Postgraduate Master's Degree in Periodontology and Implant Therapy, Dresden University of Technology with the German Society of Periodontology (DGParo).

Since 2016:
Partner in the practice Dr. Ralf Quirin, Dr. Stefan Schultheis - Practice for Dentistry

Curriculum Endodontics under the scientific direction of the University of Pennsylvania, USA.

Two-year continuing education in the field of "Function, Dysfunction, CMD and Pain", German Society for Functional Diagnostics and Therapy (DGFDT)

Since 2018:
Lectureship at Heinrich Heine University, Düsseldorf in the subject of prosthetics.


  • German Society for Dental, Oral and Maxillofacial Medicine(DGZMK)
  • Academy for Practice and Science(APW)
  • German Society for Prosthetics and Materials Science(DGPro)
  • German Society for Aesthetic Dentistry(DGÄZ)
  • German Society for Implantology(DGI)
  • Freiburg Advanced Dental Study Club (FASC)
  • German Society for Periodontology(DGParo)


  • Influence of preparation design and ceramic thicknesses on fracture resistance and failure modes of premolar partial coverage restorations. Guess PC, Schultheis S, Wolkewitz M, Zhang Y, Strub. JR.J Prosthet Dent. 2013 Oct;110(4):264-273. read
  • Monolithic and bi-layer CAD/CAM lithium-disilicate versus metalceramic fixed dental prostheses: comparison of fracture loads and failure modes after fatigue. Schultheis S, Strub JR, Gerds TA, Guess PC.Clin Oral Investig. 2013 Jun;17(5):1407-13. read
  • All-ceramic systems: laboratory and clinical performance. Guess PC, Schultheis S, Bonfante EA, Coelho PG, Ferencz JL, Silva NR. Dent Clin North Am. 2011 Apr;55(2):333-52. read.


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