Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 3D and 4D printing in dentistry and maxillofacial surgery: Recent
  advances and future perspectives   3D and 4D printing are cutting-edge technologies for precise and expedited
manufacturing of objects ranging from plastic to metal. Recent advances in 3D
and 4D printing technologies in dentistry and maxillofacial surgery enable
dentists to custom design and print surgical drill guides, temporary and
permanent crowns and bridges, orthodontic appliances and orthotics, implants,
mouthguards for drug delivery. In the present review, different 3D printing
technologies available for use in dentistry are highlighted together with a
critique on the materials available for printing. Recent reports of the
application of these printed platformed are highlighted to enable readers
appreciate the progress in 3D/4D printing in dentistry.

2
The categories of this paper are: math
32
The categories of this paper are: atom-ph
36
The categories of this paper are: cmp-lg
31
The categories of this paper are: ao-sci
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
19
The categories of this paper are: eess
26
The categories of this paper are: bayes-an
30
The categories of this paper are: q-alg
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys