Jalali Poorya, Kim Charles, Woodmansey Karl F
Departments of Endodontics, Texas A and M College of Dentistry, Dallas, Texas, USA.
J Conserv Dent. 2020 Jul-Aug;23(4):374-376. doi: 10.4103/JCD.JCD_191_20. Epub 2021 Jan 16.
Two important aspects of the dental operating microscope (DOM) that factor into its overall effectiveness are resolution and depth of field. Therefore, the objective of this study was to evaluate and compare the resolution and depth of field of DOMs from three well-known manufacturers using standardized test targets.
A resolution test, using the 1951 USAF Hi-Resolution Target (Edmund Optics, Barrington, NJ), and a depth of field test, using the Depth of Field Target 5-15 (Edmund Optics, Barrington, NJ), were performed by two calibrated observers. Three DOM systems such as Seiler IQ (Seiler Instrument Inc., St. Louis, USA), Global G-Series 6 step (Global Surgical Corp., St. Louis, USA), and Zeiss Extaro 300 (Carl Zeiss Meditec AG, Oberkochen, Germany) were used to compare the resolution and depth of field.
The Zeiss Extaro 300 showed the highest maximum resolution and maximum DOF (64 lp/mm and 17mm, respectively). The Seiler IQ showed the lowest maximum resolution and maximum DOF (35.9 lp/mm and 11 mm, respectively).
Within the limitations of this study, the Zeiss Extaro 300 was superior in terms of resolution and depth of field as compared to the other two DOMs.
牙科手术显微镜（DOM）整体效能的两个重要因素是分辨率和景深。因此，本研究的目的是使用标准化测试靶标评估和比较三个知名制造商生产的DOM的分辨率和景深。
由两名经过校准的观察者进行分辨率测试，使用1951年美国空军高分辨率靶标（埃德蒙光学公司，新泽西州巴林顿），以及景深测试，使用景深靶标5-15（埃德蒙光学公司，新泽西州巴林顿）。使用三种DOM系统，如Seiler IQ（美国密苏里州圣路易斯市Seiler仪器公司）、Global G-Series 6 step（美国密苏里州圣路易斯市Global Surgical Corp.）和蔡司Extaro 300（德国奥伯科亨市卡尔蔡司医疗技术股份公司）来比较分辨率和景深。
蔡司Extaro 300显示出最高的最大分辨率和最大景深（分别为64线对/毫米和17毫米）。Seiler IQ显示出最低的最大分辨率和最大景深（分别为35.9线对/毫米和11毫米）。
在本研究的局限性内，与其他两种DOM相比，蔡司Extaro 300在分辨率和景深方面更具优势。
