A manual for writers of research papers, theses, and dissertations, 7th edition - Kate L. Turabian 2007

Line breaks - Breaks within words
Spelling
Part III. Style 20 spelling

For most papers, the only words that should be hyphenated at the ends of lines are those you have deliberately hyphenated, such as compounds (see 20.3). Set your word processor to left justify (with a “ragged” right margin), and do not use its automated hyphenation feature.

If, however, you are required to justify both the left and right margins, you may have to hyphenate lines to avoid large gaps between words. Do not end four or more consecutive lines with hyphens (resulting in a “hyphen block” along the margin), and do not leave the hyphenation entirely to the automated function of your word processor. It will be generally reliable but will also make errors. So review word breaks after your word processor inserts them. When in doubt, consult your dictionary, which indicates acceptable breaks with centered dots or similar devices in the main word entry.

One special type of problem concerns words with the same spelling but different pronunciations. Such words may have different syllable breaks, such as rec-ord and re-cord. Your word processor may break such words identically, regardless of context.