Key Takeaways
- Researchers at Tufts University are developing lab-grown human teeth using a mixture of pig and human tooth cells.
- The bioengineered teeth exhibit properties similar to natural teeth, providing a potential alternative to traditional dental implants and dentures.
- The progress towards creating functional biological teeth could revolutionize tooth replacement in the future.
Innovation in Tooth Regeneration
Scientists have long sought alternatives for individuals who lose adult teeth, typically relying on titanium implants or plastic dentures. However, a team at Tufts University School of Dental Medicine, led by Pamela Yelick and Weibo Zhang, is working on a groundbreaking solution: lab-grown human teeth. Their approach involves using a mix of pig and human tooth cells to create bioengineered structures that closely resemble real teeth.
Yelick’s research highlights the anatomy of a healthy tooth, which consists of dental pulp at its core, surrounded by tough layers of dentin, cementum, and enamel. While enamel is the hardest tissue in the body, it can be damaged by decay, eventually affecting the dental pulp and causing significant pain. Dentists often deal with decay by placing fillings, which may only last around 15 years before requiring replacement. Over time, repeated procedures can lead to tooth loss.
Modern dental solutions typically include implants—a titanium screw placed in the jawbone with a tooth-like porcelain crown on top. While functional for biting and chewing, implants do not replicate the natural tooth’s qualities. Misalignment can result in uneven pressure on the jawbone, potentially leading to damage and peri-implantitis, an infection that can result in bone loss. Yelick emphasizes the challenges of replacing an implant after bone loss has occurred, as it requires rebuilding the lost bone.
In her quest for more natural tooth substitutes, Yelick utilizes cells from pig jaws, which are sourced from slaughterhouses. Pigs can regrow teeth multiple times, allowing researchers to collect cells from teeth that have not yet erupted. These cells are cultivated in the laboratory to increase their numbers significantly.
In earlier studies, Yelick’s team implanted these cells onto biodegradable scaffolds that mimic the shape of teeth and placed them in the skin of rats. The precursors to teeth organized themselves into structures that mirrored natural teeth in form. Building on this success, Yelick and Zhang sought to grow human teeth in the lab by using cells from human teeth and creating improved scaffolds from mini pig teeth.
Their recent research, published in the journal Stem Cells Translational Medicine, documents the implantation of pig and human tooth cell mixtures into the jaws of mini pigs. After two months, the team observed that these bioengineered teeth began developing like healthy adult teeth, establishing hard layers akin to cementum and dentin.
Cristiane Miranda França, a dentist-scientist at Oregon Health & Science University, commends the team’s findings, noting that the bioengineered teeth show essential properties missing from titanium counterparts. This research marks significant progress towards creating functional lab-grown human teeth that can seamlessly integrate with a patient’s gums and jaw structures.
While Yelick acknowledges that these lab-grown teeth are not yet perfect, she remains optimistic about the future of dental science. The team’s endeavors may one day lead to the ability to provide patients with functional biological substitutes for lost teeth, bringing forth a new era in dental restoration.
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