High resolution is obtained with:
Intraoral dental X-ray film is made as a double-emulsion film—that is, both sides of the base are coated with an emulsion. With a double layer of emulsion, less radiation is required to produce an image.  Direct exposure film is used for intraoral examinations, because it provides higher resolution images than screen-film combinations. Some diagnostic tasks, such as detection of incipient caries or early periapical disease, require this higher resolution.
Reference: White and Pharoah's Oral Radiology Principles and Interpretation 7th edition page no 64
Intraoral films with direct exposure
Extraoral films with intensifying screen
OPG
All of the above
Intraoral films with direct exposure