title: Comparison of two different ultrasound methods of phacoemulsification.
abstract: OBJECTIVE
  To compare the safety and efficacy of microcoaxial phacoemulsification surgeries performed with the OZil Intelligent Phaco torsional mode (Alcon Laboratories, Inc., Fort Worth, USA) and combined torsional/longitudinal ultrasound mode using 45 degree aperture angled tips.
  
  
  METHODS
  Prospective randomized clinical trial.
  
  
  METHODS
  setting: Maltepe University, Istanbul. patient population: Eighty eyes of 80 cataract patients were randomly assigned to 2.2 mm microcoaxial phacoemulsification using the OZil Intelligent Phaco torsional mode (Group 1) or combined torsional/longitudinal ultrasound mode (Group 2). observation procedure: Intraoperative fluid and energy usage and postoperative examinations were evaluated. main outcome measures: Ultrasound time, cumulative dissipated energy, longitudinal and torsional ultrasound amplitudes, mean operation time, mean volume of fluid used, and surgical complications.
  
  
  RESULTS
  Both groups included 40 eyes. Mean ultrasound time, cumulative dissipated energy, and longitudinal and torsional ultrasound amplitudes in Group 1 were 58.21±33.81 seconds, 7.74±6.23, 0.45±0.30, and 26.30±12.60%, respectively, and these parameters in Group 2 were 64.75±30.23 seconds, 12.61±6.21, 26.32±5.85, and 40.98±8.33%, respectively. Cumulative dissipated energy and longitudinal and torsional amplitudes were found to be significantly lower in Group 1 (P=.001, P<.001, P<.001). Mean volumes of fluid used in Groups 1 and 2 were 73.30±19.87 cc and 107.07±21.82 cc, respectively (P<.001).
  
  
  CONCLUSIONS
  With the aid of a 45 degree aperture angled tip, the OZil Intelligent Phaco torsional mode provided more effective lens removal than the combined torsional/longitudinal ultrasound mode, with a lower cumulative dissipated energy and volume of fluid used.
authors.affiliation: Department of Ophthalmology, Maltepe University School of Medicine, Istanbul, Turkey. Electronic address: firathelvacioglu@yahoo.com.
authors.forename: Firat
authors.initials: F
authors.lastname: Helvacioglu
authors.affiliation: Department of Ophthalmology, Basaksehir State Hospital, Istanbul, Turkey.
authors.forename: Celal
authors.initials: C
authors.lastname: Yeter
authors.affiliation: Department of Ophthalmology, Maltepe University School of Medicine, Istanbul, Turkey.
authors.forename: Sadik
authors.initials: S
authors.lastname: Sencan
authors.affiliation: Department of Ophthalmology, Maltepe University School of Medicine, Istanbul, Turkey.
authors.forename: Zeki
authors.initials: Z
authors.lastname: Tunc
authors.affiliation: Department of Ophthalmology, Maltepe University School of Medicine, Istanbul, Turkey.
authors.forename: O Murat
authors.initials: OM
authors.lastname: Uyar
mesh_terms: D000368:Aged; D002386:Cataract / Q000175:diagnosis*; D003315:Cornea / Q000601:surgery*; D005260:Female; D005500:Follow-Up Studies; D006801:Humans; D008297:Male; D061646:Operative Time; D018918:Phacoemulsification / Q000379:methods*; D011446:Prospective Studies; D016896:Treatment Outcome; D059708:Ultrasonic Surgical Procedures / Q000379:methods*; D014792:Visual Acuity