Surgical Loupes [ C Maxx TTL ] usually magnify in the range of ×2.5 to ×6.0, whereas the surgical operating microscope has a range of magnification of up to ×40. The obvious question is “How much magnification is enough?” As the level of magnification increases, the field of vision and the depth of field (focal depth) decrease, as does the aperture of the microscope, therefore limiting the amount of light that reaches the surgeon’s eyes. This makes use of magnification in excess of ×30 very impractical. The slightest movement of the patient or of the operating microscope will result in the loss of visual field or focus. This can be very frustrating and result in the time-consuming need to readjust the microscope.
Midrange magnifications in the ×10 to ×16 are best for performing procedures such as root-end resections and root-end preparations. Higher range magnification in the area of ×18 to ×30 are extremely cumbersome and should be reserved for extreme endodontic procedures.
It must be pointed out that the use of the surgical operating microscope requires a relatively long learning curve and, therefore, it is recommended that the endodontic surgeon participate in advanced training programs and gain considerable experience in surgical microscopy before implementing its use in clinical practice.
Rubinstein R. Endodontic microsurgery and the surgical operating microscope. CompendContinEduc Dent1997;18:659.
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