In the second case, the complaints assessment committee said the male Auckland teacher, who also has name suppression, used his school laptop to access pornographic images and failed to prevent students from seeing them.
In October 2015, he accessed pornographic websites a number of times, the notice of charge said.
"He failed to safeguard students from seeing the images, resulting in two Year 8 students who were using the laptop to download photographs into a yearbook on November 4, 2015, seeing images of naked women."
It said the teacher failed to own up to the incident when questioned by the school, and tried to blame it on his son.
The complaints assessment committee argued both cases amounted to serious misconduct.
The tribunal reserved its decisions in both cases.