Table 7.

Advantages and disadvantages of various coating techniques.

Method	Advantages	Disadvantages
Plasma spraying	Strength bonding, preferable dissolution behaviour	The complex process due to the number of interacting parameters, difficulty in the internal coating of bores, high-cost
Magnetron sputtering	Thin, uniform, and dense films, easy to scale up, low damage to soft tissues, high rate of adhesion, high rate of deposition, suitable for a wide range of materials	Nonhomogeneous ion current distribution across the target surface, high-cost
Sol-gel	Excellent control of product purity and composition, ability to deposit films and coatings on different surfaces, low temperatures	Easy to crack in the drying process, the high cost of raw materials