Our Team

Meet the Team at Performance Dental Center

Welcome to Performance Dental Center! You’ll find high quality dental care and advanced services offered in a relaxed and laid back atmosphere. Our office is modern and equipped with the latest in dental technology to make treatment more comfortable, efficient, and pleasant for our patients.

Performance Dental Center prides itself on providing general and sports dental services to families and athletes in and around Boulder. We believe dental health is essential to successful physical and mental performance. Whether you are an elite athlete or on your own path to wellness, we will help you understand how optimum oral health can enhance a strong and healthy body.

We take pride in our work and promise to continue pushing the mold of sports dentistry as the dental provider of choice for Boulder's athletes and the athlete in you.


Associate Dentist

Dr. Ribbens is originally from Green Bay, Wisconsin, and after dental school in Minneapolis set his sights on practicing along the beautiful Colorado front range. He completed his undergraduate degree in nutrition at the University of Minnesota before being accepted into their dental program. He began practicing dentistry in 2017 in Arvada, Colorado, and found us at Performance Dental Center in January of 2020. Dr. Ribbens is a member of the American Dental Association, the Colorado Dental Association, and the Boulder Broomfield County Dental Society. His favorite thing about practicing in Boulder is meeting all of the amazing patients while helping them achieve their best oral health. He currently resides in Longmont, Colorado with his wife Deidre and their dog Ozwald. When not in the office, Dr. Ribbens enjoys cycling, skiing, Italian wine, playing guitar, traveling, and all kinds of cheese.


Dental Hygienist

Dallas has been a Hygienist for 10 plus years. She is a proud graduate of Herzing University out of Wisconsin. Dallas has been with Performance Dental Center for over 4 years and brought her drive to help patients find their healthiest smile definitely shines in her work. Once you meet Dallas and see her passion for a healthy mouth you will can’t help but smile!

Favorite Movie Quote: “I smell ice cream” Chunk- The Goonies

Fun Fact: Dallas loves Museums and has a goal to visit all of the museums in Colorado one day!


Dental Assistant (EDDA)

Yubelli has been Performance Dental Centers EDDA (Expanded Duties Dental Assistant) for just over 3 years. She has been in the dental field for over 9 years. She treats every patient with care and loves what she does. She grew up in Colorado (Summit County to be exact) and she is currently in school.

Favorite Movie Quote: “ForEVER” Ham- The Sandlot

Fun Fact: Yubelli loves mechanical bulls and she doesn’t know what she wants to be when she grows up!


Office Manager

Evan was born and raised in NE Colorado and moved to Florida in her early 20’s. She started her journey in the Healthcare industry in 2009 working as an accessioning coordinator for the local hospital. She eventually worked her way up to Healthcare Administration by 2014 and became the Practice Manager for a Private Audiology Clinic. In 2017 she made the move back to Colorado to be closer to her family. Shortly after moving to CO she made the jump from Audiology to the Dental field in 2019 and has fallen in love with improving peoples smiles. Evan joined the Performance Dental Center family in October 2021 and loves how easy going and family oriented both the staff and patients are, “I already feel like part of the family.”

Evan and her husband run a home based “circus” consisting of 3 kids, 2 dogs, 2 cats, 2 guinea pigs, and a bearded dragon residing in the Longmont area. In her spare time Evan enjoys spending time with her family doing pretty much anything nerdy like...



Dr. Sigman has always wanted to live in Boulder, CO, so starting his own practice here has allowed him to live the dream!

After receiving his undergraduate education from the University of Kansas in 2007, he then went on to complete dental school at Southern Illinois University School of Dental Medicine, where he received his Doctor of Dental Medicine (DMD).

He is a member of multiple organizations, including the American Dental Association, the Colorado Dental Association, the Academy of General Dentistry, and the Denver Implant Study Club. Most notably, he is the 2019 Vice President of the Boulder/Broomfield County Dental Society and a recipient of the peer-nominated 5280 Best Dentist Award for 2018 and 2019. Dr. Sigman has received recognition from the Seattle Study Club as well as the Horace G. Wells Award for Excellence in Dental Anesthesiology. He is also the only dentist in the Boulder area who is a member of the Academy of Sports Dentistry.

Dr. Sigman has...