. 2020 Nov 9;25(2):737–744. doi: 10.1007/s00784-020-03649-y

Table 2.

Results of the in vitro SEM margin analysis.

Experimental in vitro group	% gap-free margin (SD) before TML	% gap-free margin (SD) after TML
Box only A	92.3 (9.3) ^B	79.2 (8.9) ^B
Box only B	100 ^A	87.9 (7.4) ^A
Tunnel A	86.6 (11.2) ^C	70.3 (12.2) ^C
Tunnel B	100 ^A	90.3 (6.6) ^A

Same superscript letters within columns mean p > 0.05. It is visible that in groups without flowable lining, also prior to thermomechanical loading (TML), defects were detectable under the SEM at × 200 magnification