Objectives There is a long history of studies into cystic lesions of the jaws. However, there is little data on postoperative bone regeneration. The aim of the study was to calculate the size of the residual bone lesions after cystostomies and cystectomies to predict the postoperative bone healing. Material and methods This retrospective study focused on patients undergoing cystectomy (n = 114) or cystostomy (n = 86), who were treated for cystic lesions between 2010 and 2015. New formulas were developed to measure the decrease in lesion sizes using the craniocaudal and mesiodistal diameters from preoperative as well as postoperative radiographs (panoramic radiographs, CT scans, CBCT). With these predictive models (calculated by linear regression analyses), it is possible to calculate how the lesions would shrink using initial size of the cyst and time after surgery for both dimensions. Results After cystostomy, the mesiodistal size was initial size 6.0 + 0.7 × initial size − 9.4 × time. The craniocaudal size was 5.1 + 0.7 × initial size − 7.3 × time. After cystectomy, the mesiodistal size was 0.4 + 0.7 × initial size − 8.4 × time. The craniocaudal size was 0.4 + 0.5 × initial size − 6.4 × time (R 2 = 0.59 and 0.67, respectively). Conclusion These formulas are suggested to be used to calculate residual size of bone lesion after cystostomy and cystectomy to predict postoperative bone healing. Clinical relevance The formulas are based on deliberately simple measurement using only panoramic radiographs to encourage their application in daily clinical practice.

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Background: Photographic documentation is an important tool for the assessment of baseline facial aesthetics and monitoring treatment results in orthognathic patients. Objectives: The aim of this study was to quantify the influence of the aesthetics of single components of the face on overall facial attractiveness. Methods: Four independent raters (two female, two male) evaluated the pre-and postoperative frontal and lateral facial photographs of 213 patients who had undergone orthognathic surgery at the Department of Cranio-, Maxillofacial and Oral Surgery, Vienna General Hospital between 2007 and 2015. The raters used a 7-point Likert scale (1 = lowest score, 7 = highest score) to assess the aesthetics of each patient's nose, lips/mouth, eyes, skin, hair as well as the slenderness of the face and the overall facial attractiveness. Findings: 23,856 ratings were recorded. The mean aesthetic score for the nose was 4 ± 1 (95% CI, 1.2-6.2), the lips/mouth 3.9 ± 1 (95% CI, 1.5-6.5), the eyes 4.2 ± 0.9 (95% CI, 1.5-6.5), the skin 4.6 ± 1.2 (95% CI, 1-7), the hair 3.8 ± 1 (95% CI, 1-6.8), the slenderness of the face 4.2 ± 1.1 (95% CI, 1.2-6.5) and for overall attractiveness 3.6 ± 1.1 (95% CI, 1-6.2). It was possible to estimate overall attractiveness by combining the aesthetic scores of the single components with a coefficient of determination (R 2 ) of 0.72. Conclusion:The findings of this study emphasise the influence of the single components on overall facial attractiveness.