Table 7.

Characteristics and challenges of digital light processing (DLP)

	Characteristics	Challenges
Method	DLP uses UV light and micro-mirror device for projected digital light into the vat of photopolymer[20]. The projector system can be bottom-up or top-bottom[21]. This process is faster in printing time and more efficient as well as allows operating at a wider range of wavelengths, compared to SLA[22]. DLP can work with customized resin reservoirs and small volumes of photoreactive polymers[22].	The post-curing steps may result in a loss of drug loaded and imprecise dosing[12]. The residual resin can represent a toxicity risk[11].
Material	DLP uses photoreactive and photocurable materials[12]. The medicine can be loaded directly into the liquid prepolymer solution, depending on its solubility[12]. DLP uses standard and castable resins[14].	This process only works with photoreactive and photocurable materials[12].
Quality	Like the others processes of vat photopolymerization, DLP prints with high resolution[21]. Carbon 3D (US) has several Carbon Digital Light Synthesis printers and the resolution are 25, 50 or 100 µm[18,23].