Usually the Dentist will be able to determine if a tooth will require surgical extraction from examining your tooth and X-Ray. However, occasionally there are times when it is not evident that a tooth will need surgical removal until part-way through the procedure – for example if the tooth breaks during the procedure.
Other reasons may include if the tooth is very broken down, if it is impacted or if it has particularly curved or long roots.
The Dentist will make every effort to avoid surgical removal of a tooth, however sometimes the procedure can be quicker and less painful if they take steps to surgically remove the tooth in the first place.
Surgical extractions can take longer and require more equipment and skill, hence the further charge.