Ergonomics in Dentistry
2014-4-26 · The chair should be raised so the operator's thighs can freely turn beneath the patient's chair. Clearance around the patient's head should at least allow unimpeded operator access from the 7 to 12:30 o’clock position, for right-handed operators. For most intraoral access sites, the maxillary plane should be extended 7° beyond the vertical.
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