Objective To compare the dosimetric difference among plans designed by 4-field,6-field TomoDirect and TomoHelical techniques in Tomotherapy system for left-breast cancer patients with radiotherapy after breast-conserving surgery.Method A total of 16 patients with left-breast cancer following breast-conserving surgery and intensity-modulated radiation therapy were enrolled in this retrospective study.The 4-field TomoDirect (TD4),6-field TomoDirect (TD6),and TomoHelical (TH) techniques were applied to design simulation plans in tomotherapy system for each patient,respectively.The differences of dose distribution and treatment parameters were analyzed in this study.Results Three plans all met the clinical requirement.Thereinto,TD4 was superior to TH in the dose limitation of organs at risk (OARs),especially the max dose of cord and right-breast,thc 5 Gy radiation volume of lung,and the mean dose of heart(F =595.60,129.24,60.44,65.37,P ＜ 0.05),but inferior to TH in dose homogeneity (HI) and conformity (CI) (F =2.78,60.93,P ＜ 0.05).However,TD6 improved TD4's HI and CI when delivered the lower OARs dose compared to TH.Meanwhile,the number of monitor units was less in TD technique and reduced the treatment times (F =24.89,3.75,P ＜ O.05).Conclusions For the radiotherapy of left-breast cancer patients after breast-conserving surgery,TD6 technique appeared to be superior,with the lower radiation dose of OARs compared to TH technique,and the better target's HI and CI in comparison with TD4 technique,especially in patients with early stage breast cancer.

Objective This study aims to provide craniofacial features and incisor position prediction models among esthetics population after orthodontic treatment.Methods A total of 338 patients with esthetic profiles were se-lected from 1 055 post-orthodontic adults based on inclusion and exclusion criteria and scored by five dental students.Mean values of cephalometric measurement were demonstrated with gender and sagittal skeletal pattern(ANB)differ-ences assessed by generalized estimating equation.Correlations among age,skeletal,and soft tissue variables in differ-ent genders were determined.Multivariate analysis was used to assess the influence of skeletal and soft tissue variables on orthodontic incisor position.Results Within the esthetic cohort after orthodontic treatment,gender differences ex-isted in cranial and mandibular length,mandibular rotation,protrusion of pogonion,inclination of maxillary incisors,upper lip thickness,lower 1/3 face height,and nose protrusion.However,in class Ⅰ malocclusion,the development of the chin showed no significance,whereas the protrusion of the lower lip significantly differed between genders,with less protrusion in males.In males,the protrusion of lip and chin varied among groups,with thinner basic upper lip thick-ness of class Ⅱ than class Ⅰ and greater lower lip height of class Ⅲ than class Ⅰ.In females,the protrusion and height of the upper lip and chin varied in groups,with thicker basic upper lip thickness of class Ⅲ than class Ⅰ.Upper lip thickness,female basic upper lip thickness,and female lower lip height were correlated with age.The protrusion of the upper lip was mainly correlated with posterior cranial base,mandibular body length,ANB in male and SNA,ANB,sag-ittal maxillary length,mandibular rotation,and protrusion of pogonion in female.The protrusion of the lower lip in males was mainly correlated with ramus height,mandibular rotation,protrusion of pogonion in male and ANB,mandib-ular rotation,and protrusion of pogonion in females.After employing skeletal variables to fit dental parameters,optimal results were achieved in male IMPA(adjusted R2=0.712)and female G Vert-U1(adjusted R2=0.795).After employing skeletal and soft tissue variables simultaneously,optimal results were achieved in male and female G Vert-U1,which was mainly influenced by the protrusion of the chin and nasal base in males(adjusted R2=0.836)and the protrusion of the nasal base as well as ANB in females(adjusted R2=0.842).Conclusion This study demonstrated the craniofacial features of esthetics population after orthodontic treatment and revealed the correlation of gender,age,skeleton,and soft tissues to provide reliable prediction models for aesthetic orthodontic incisor position.

With recent developments in photosensitizers and light delivery systems, topical 5-aminolevulinic acid-mediated photodynamic therapy (ALA-PDT) has become the fourth alternative therapeutic approach in the management of oral leucoplakia (OLK) due to its minimally invasive nature, efficacy, and low risk of systemic side effects and disfigurement. This report presents step-by-step guidelines for applying topical ALA-PDT in the management of OLK based on both the clinical experience of the authors and a systematic review of the current literature. Studies using protocols with standardized parameters and randomized clinical trials at multiple centres with adequate sample sizes and both interim and long-term follow-ups are needed before universally applicable guidelines can be produced in this field.
Aminolevulinic Acid ; administration & dosage ; therapeutic use ; Humans ; Leukoplakia, Oral ; therapy ; Photochemotherapy ; methods ; Photosensitizing Agents ; administration & dosage ; therapeutic use ; Practice Guidelines as Topic