It happened on the B3081 near Verwood - he had to be cut free by firefighters.
Man Loses Teeth In Southampton Attack
Police are looking for four young people after an attack on a man in Southampton.
Officers are investigating the assault on The Avenue at 10.30pm on Tuesday 4 March.
A 56-year-old man was approached by three men and a woman, all described as in their twenties, who were walking from Bannister Road towards the city centre.
One of the men hit the victim in the face without warning.
He was treated at Southampton General Hospital for a split lip and had to have three teeth removed.
Anyone with any information is asked to contact PC Daniel Smith at Portswood Police Station on 101 or via the website http://www.hampshire.police.uk/internet/do-it-online/online-forms/message-for-officer.html.
You can also call the charity Crimestoppers line on 0800 555 111 where information can be left anonymously.
Violent crime was up 37% in the last year. Police say it's mainly due to a change in how offences are recorded.
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