Comparison of conventional and torsional mode (OZil) phacoemulsification: randomized prospective clinical study

Abstract

No statistically significant difference was found between conventional and torsional phacoemulsification with respect to USTT and CDE. Torsional mode led to a significant reduction in US power in footswitch position 3. Torsional mode also appears to be associated with less loss of ECD.

Comparison of endothelial changes and power settings between torsional and longitudinal phacoemulsification

“…Liu et al 18 report the same for CDE and US time and Rekas et al, 45 for CDE in the eyes with the same nucleus density. Our operative parameters were similar to those of Bozkurt et al, 46 who found lower CDE and US time values in the torsional group as well; however, the only statistically significant difference was in the percentage of total equivalent power in position 3. In our study, we found significantly lower values for US time, CDE, and total equivalent power in position 3.…”

Endothelial cell loss: Biaxial small-incision torsional phacoemulsification versus biaxial small-incision longitudinal phacoemulsification

“…2,22 High- CDE Z cumulative dissipated energy; %TEPiP3 Z percentage total equivalent power in position 3; UST Z total ultrasound time density nuclear cataract, increased infusion volume, and a large nucleus are independent predictors of endothelial cell loss in coaxial torsional phacoemulsification. 23 Studies 8,9,12,24 have shown that the total power applied within the eye is lower with the torsional method than with the longitudinal method and less surgery-related endothelial cell damage occurs. In a study by Wang et al, 18 the endothelial cell loss with the biaxial torsional method was 25% in eyes with grade 4 nuclear cataract (LOCS III grading system) 1 month postoperatively.…”

“…13 Nonetheless, in soft to hard nuclear cataracts, there is no difference in UST and CDE between the 2 techniques, whereas the percentage total equivalent power in position 3 has been reported to be low with the torsional method. 12 It has been reported that in soft nuclear cataracts, lower CDE values are obtained with the biaxial microburst longitudinal method than with the coaxial microburst longitudinal method, whereas in moderate nuclear cataracts, higher CDE values are obtained with the biaxial torsional method. 13,18 In our study of patients with modarate to hard nuclear cataract, the CDE and balanced salt solution volume values were lower and the percentage total equivalent power in position 3 and UST values were higher with biaxial torsional with the enhanced phaco method than with biaxial longitudinal microburst method.…”

“…12 In eyes with high-density nuclear cataract, the UST is longer, higher ultrasound power is used, and the balanced salt solution volume increases. Because of advanced phaco-tip designs, the specific chopping technique used, and advances in software (eg, second pulse burst and millisecond-level microburst), the nucleus is efficiently emulsified and aspirated by ultrasound power in eyes with high nuclear cataract density.…”

Stroke dynamics and frequency of 3 phacoemulsification machines

“…2,3 These events generate repulsion of the lens material, producing a chattering effect that has to be compensated for by increasing the flow rate and the tip movement in the anterior chamber to regain occlusion. 2,4 The tendency of the fragments to be aspirated into the phaco tip in a relatively feathery and continuous way is known as followability. 5 A high level of followability implies less phaco movements in the anterior chamber and less stress to the eye structures with an overall increase in phaco efficiency.…”