CHELMSFORD DENTAL SPECIALISTS - Key Persons


Dr William Negreiros

Job Titles:
  • General Dentist
Dr. William is a highly skilled dental professional with over a decade of dentistry experience and substantial expertise in guided surgery, bone grafting, and regenerative procedures. A proven track record of successful outcomes underscores his dedication in these areas of dentistry. Dr. William is known for his meticulous planning and execution of guided surgical implant placement and his adept utilization of cutting-edge digital dentistry techniques. This wealth of expertise in guided surgery, bone grafting, and regenerative procedures complements Dr. William's impressive academic and professional journey. He embarked on his dental career by earning his dental degree in São Paulo, Brazil 2013. Subsequently, he pursued advanced specialization, obtaining a master's in Dental Materials Sciences and a specialty certificate in Implant Dentistry in Brazil. His commitment to excellence led him to the United States, where he secured a prestigious two-year fellowship in Implant Dentistry at Harvard School of Dental Medicine. Following this, he decided to have his dental degree recognized in the US and graduated with distinction (cum laude) from Tufts University School of Dental Medicine. During his tenure at Tufts University, Dr. William's exceptional academic achievements garnered multiple awards, including the "Dr. Joseph E. Primack Endowed Prize in Prosthodontics," "The International Congress of Oral Implantology Achievement Award," and the "Academy of Osseointegration Outstanding Research and Best Clinical Research Presentation Awards." Furthermore, his dedication to scholarship earned him induction into the Omicron Kappa Upsilon honorary society. Dr. William's expertise is further demonstrated by his prolific publication record, encompassing over 20 articles in the specialized fields of Implant Dentistry and Prosthodontics. Beyond his professional accomplishments, Dr. William is a devoted family man, sharing his life with fellow dentist Dr. Rachel Monteiro, an endodontist. They cherish parenthood with their son, Benjamin, and enjoy moments of relaxation and leisure together. Dr. William's interests include tennis, fitness training, and culinary exploration. Most importantly, he values quality time spent with his loved ones. Dr. William is proficient in English and Portuguese, making him a versatile and skilled dental practitioner.

Dr. Mei-Yee Chan

Job Titles:
  • General Dentist
Dr. Chan moved to New England at a very young age and grew up locally in Massachusetts. She completed her undergraduate studies at Wellesley College. Dr. Chan went on to study dentistry at Tufts University School of Dental Medicine, where she obtained her Doctor of Dental Medicine. Dr. Chan enjoys staying active in the community, such as joining humanitarian mission trips to provide dental care and attending continuing education courses. She is an active member in the Massachusetts Dental Society, the Academy of General Dentistry, and the American Dental Association. Her goal is to help patients create healthy and beautiful smiles. During her free time, Dr. Chan enjoys reading, outdoor sports, and being with family. She fluently speaks Mandarin Chinese and Cantonese Chinese in addition to English.

Yousef Sidki

Job Titles:
  • General Dentist
Yousef Sidki, DMD is a native of Massachusetts and has been practicing in a private practice setting since graduating from Boston University Dental School. Dr. Sidki has led several practices and has had an extensive track so far in continuing education in the fields of cosmetics, Implantology, treating worn dentition, as well as attaining fellowship status in the International Dental Implant Association. Dr. Sidki treats all the varieties of needs ranging from simple fillings, all the way to full mouth rehabilitation. He is an active member of the American Academy of Cosmetic Dentists, American Dental Association, and the International Dental Implant Association. He prides himself on attaining the absolute best quality of comprehensive dental care to all of our wonderful patients. You are welcome to schedule an appointment with Dr. Sidki at 978-250-0079. Dr. Sidki and Linda are an outstanding team. My 85 year old mother is a patient of theirs. The level of care, concern and patience they have is unmatched. I actually look forward to our visits. They are so engaged with their patients, and make everyone feel welcome. I am so happy we found this practice.