The terminology and classification of incomplete tooth fractures have received significant attention in the scientific literature for many decades. Numerous terms and definitions have been proposed through the years, arising from the difficulties related to diagnosis, prognosis assessment and treatment planning. Cuspal fracture (Gibbs 1954), fissure fracture (Thoma 1954), fissural fracture (Down 1957), crack lines and greenstick fracture (Sutton 1961; 1962), cracked tooth syndrome (Cameron 1964), hairline fracture (Wiebusch 1972), split-root syndrome (Silvestri 1976), enamel infraction (Andreasen 1981), crack lines and craze lines (Abou-Rass 1983), and incomplete tooth fracture (Luebke 1984) are some of the terms used through the years. Many of these terms were used by different authors to describe the same clinical entity...
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