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University of Colorado Denver

University of Colorado Denver School of Medicine

Ulrich Klein

Professor and Chair

Ulrich Klein
Ulrich Klein

Department of Pediatric Dentistry
13123 E 16th Ave
Box B240
Aurora, CO 80045

Phone: 720-777-2719
Fax: 720-777-7238



  • DDS, University of Nebraska
  • Fellowship in Pediatric Dentistry, University of Illinois at Chicago
  • Residency in Pediatric Dentistry and MS Degree, University of Iowa
  • Residency in Orthodontics, University of Giessen (Germany)
  • Doctoral Thesis, USA PhD equivalent, University of Giessen
  • DMD, University of Giessen


Honors and Awards:

  • Orthodontics Section Editor, Pediatric Dentistry (2015 - 2018)
  • Fellow of the American College of Dentists (FACD), 2013
  • Honorary Alumni Award, University of Colorado School of Dental Medicine, 2009
  • Member, Omicron Kappa Upsilon National Dental Honor Society, 2008
  • Parent-to-Parent Organization: "Professionals Who Care" Award, 2008



  • University of Colorado School of Dental Medicine
  • Children's Hospital Colorado


Research Interests:

Nitrous oxide, assessment of stressors for patients and providers during dental treatment


Recent Publications:

Klein U, Alford JA, Allshouse A, Sain J. Maxillary “9-Year Molars”: Prevalence and Associated Dental and Medical Conditions". Accepted April 6, 2016 for publication in Pediatr Dent.

Klein U, Paimagham B, Blumhagen R, Kroehl M, Sain J. Pyramidal and Taurodont Molars and their Association with Other Tooth Anomalies. Accepted April 1, 2016 for publication in Pediatr Dent.

​​Klein U, Managkil R, DeWitt P. Parents' Ability to Assess Dental Feat in Their Six- to 10-year-old Children. Pediatr Dent 2015;37(5):217-22.

Gandhi R, Klein U. Autism Spectrum Disorders: An Update on Oral Health Management. J Evid Base Dent Pract 2014 Jun; 14 Suppl:115-26. PMID:24929596

Klein U, Storey B, Hanson PD. Benefits of externships with pediatric dentistry programs for potential residents: program directors' and current residents' perceptions.
J Dent Educ. 2014 Mar;78(3):473-80. PMID: 24609349

Klein U. Chapter 15: N2O/O2 Sedation in Pediatric Dentistry. In: Clark/Brunick: Handbook of Nitrous Oxide and Oxygen Sedation, 4th ed. 2014; Elsevier, St. Louis, MO.

Klein U, Kleier DJ. Sodium Hypochlorite Accident in a Pediatric Patient. Pediatr Dent 2013;35(7):456-60.

Klein U, Chapter 17: Oral Medicine and Dentistry; p 465-476, Current Diagnosis & Treatment Pediatrics, 21st ed. McGraw Hill Medical Textbook, 2012

Klein U, Facial Swelling and odontogenic Infections; pages 94-99, Berman's Pediatric Decision Making, 5th ed. Elsevier Mosby 2011

Greene AE, Roosevelt GE, Grubenhoff JA, Klein U. Little boy black and blue. Pediatr Emerg Care. 2011; 27 (8): 758-9. PMID: 21822090

Khaled J, Klein U, Meinke D. Assessment of Noise Exposures in a Pediatric Dentistry Clinic. Pediatr Dent. 2011; 33: 342-7. PMID 21903003

Klein U, Robinson TJ, Allshouse A. End-Expired Nitrous Oxide Concentrations Compared to Flowmeter Settings During Operative Dental Treatment in Children. Pediatr Dent. 2011 Jan-Feb;33(1):56-62. PMID 21406149

Klein U, Hunzeker C, Hutfless S, Galloway A. Quality of anesthesia for the primary anterior maxillary segment in pediatric patients: Comparison of the P-ASA nerve block using the CompuMedTM delivery system with traditional supraperiosteal injections. J Dent Child 2005; 72:119-25. PMID 16568918