Behavior of osteoblasts on TI surface with two different coating designed for orthodontic devices

Area of Science:

• Biomaterials Science
• Orthodontics
• Cell Biology

Background:

• Titanium (Ti) implants are widely used in orthopedics and dentistry.
• Surface modifications aim to improve osseointegration and implant performance.
• Polytetrafluoroethylene (PTFE) and titanium nitride (TiN) are common surface coatings.

Purpose of the Study:

• To investigate the in vitro effects of PTFE and TiN coatings on titanium surfaces on osteoblast behavior.
• To evaluate cell viability, proliferation, and gene expression of osteogenic markers.

Main Methods:

• MG-63 osteoblasts were cultured on uncoated Ti6Al4V, TiN-coated, and PTFE-coated titanium discs.
• Cell viability and proliferation were assessed using MTT assay.
• Gene expression of alkaline phosphatase (ALP), osteocalcin (OC), type I collagen, RANKL, and OPG was determined by qPCR.
• Cell behavior was observed using time-lapse microscopy.

Main Results:

• PTFE coatings initially delayed cell attachment and proliferation but led to higher viability and proliferation after 168 hours.
• PTFE coatings increased the expression of osteogenic genes (ALP, OC) and the OPG/RANKL ratio.
• TiN coatings showed no significant effect on any investigated parameters.

Conclusions:

• PTFE coating is non-toxic to MG-63 osteoblasts and stimulates osteogenesis-related gene expression.
• PTFE-coated titanium surfaces show promise for use in temporary skeletal anchorage devices in orthodontics.