Effectiveness of calibrated digital photography technique in dental shade analyses applications

Objectives: Although spectrophotometers are commonly used in shade analysis in dentistry; digital cameras, photographic lighting systems, computer programs and photographs have also become the part of this field. The aim of this study was to compare the success of spectrophotometer and calibrated digital photography on shade selection. Materials and Methods: 3D-Master toothguide (VITA) with 29 tabs was used for the analyses. L, a, b values were determined by a spectrophotometer (Minolta CM-2300D, Konica) and these values were matched with digital photographic measurements. Photographs were transferred to an image analyzing software (Adobe Photoshop CC). Results: There were significant differences between L* values of the spectrophotometric analyses and digital measurements in 3 different regions of the tab (p<0.05). For the evaluation of ΔE values, Post hoc Bonferroni analysis which was performed between the 3 regions of shade tabs revealed significant difference between the middle (21.92 ± 2.31), incisal (13.67 ± 1.69) and cervical (19.57 ± 2.47) region of the tabs (p<0.05). Conclusion: Spectrophotometer was found to be a more accurate shade determination technique compared to calibrated digital photography

The reasons for evisceration after penetrating keratoplasty between 1995 and 2015

<div><p>ABSTRACT Purpose: The purpose of this study was to determine the indications and frequency of evisceration after penetrating keratoplasty (PK). Methods: The medical records of all patients who underwent evisceration after PK between January 1, 1995 and December 31, 2015 at Ankara Training and Research Hospital were reviewed. Patient demographics and the surgical indications for PK, diagnosis for evisceration, frequency of evisceration, and the length of time between PK and evisceration were recorded. Results: The frequency of evisceration was 0.95% (16 of 1684), and the mean age of the patients who underwent evisceration was 56.31 ± 14.82 years. The most common indication for PK that resulted in evisceration was keratoconus (37.5%), and the most common underlying cause leading to evisceration was endophthalmitis (56.25%). The interval between PK and evisceration ranged from 9 to 78 months. Conclusions: Although keratoplasty is one of the most successful types of surgery among tissue transplantations, our findings show that it is associated with a possible risk of evisceration.</p></div