Sirintawat N, et al. J Dent Anesth Pain Med. 2017 Dec;17(4):253-263. https://doi.org/10.17245/jdapm.2017.17.4.253

Sugragan C, et al. J Dent Anesth Pain Med. 2020 Oct;20(5):281-291. https://doi.org/10.17245/jdapm.2020.20.5.281

Purpose: The aims of the study were to estimate the frequency of epiphora and to identify factors associated with epiphora after orbital‐sparing maxillectomy via modified Weber–Ferguson incision with lower blepharoplasty (OSOSM‐MWFILB).Methods: We performed a retrospective cohort study enrolling a sample derived from the patient population undergoing OSM‐MWFILB over a 7‐year period. The predictor variables were grouped into demographic, related health status, anatomic, tumor‐specific, and therapeutic categories. The primary outcome variable was the presence of postmaxillectomy epiphora (PME). Descriptive, univariate, and multivariate regression mixed‐effect models were computed.Results: The study sample was composed of 134 patients (46.3% females; 71.6% squamous cell carcinomas) with a mean age of 64.7 ± 12.2 years. There were 23 (17.2%) PME events, which were significantly associated with eight variables: male gender, poor general health (ASA III–IV), large vertical defect (Brown and Shaw's class III–IV), squamous cell carcinoma tumor type, big tumor size (T3‐4), cervical lymph node metastasis (N1‐2), long operating time > 3 h, and adjuvant radio(chemo)therapy in both univariate mixed regression and multivariate Cox hazards analyses. Healing of PME in irradiated patients was significantly delayed.Conclusions: Ophthalmologic consequences in patients undergoing OSM‐MWFILB require particular attention, especially in case of advanced tumors, multiple comorbidities, or long surgery with postoperative radio(chemo)therapy. This emphasizes the importance of appropriate cooperation between the surgeons and ophthalmic colleagues.

Surgical splints are widely used in orthognathic surgery. The fitting of a surgical splint affects the success of the surgery. Stereolithography (STL), the method used to achieve accurate and reliable input files, is important for the manufacturing process of the surgical splint. Nowadays, data acquisition can be performed with the aid of an intraoral scanner (IOS) or impression materials. This in vitro study aimed to compare the trueness and precision of IOS (TRIOS3^®, 3Shape, Copenhagen, Denmark) and alginate impression (Kromopan^®, Lascod, Florence, Italy) in a full-arch dental model with/without orthodontic brackets. Custom complete arch models were fabricated with a refractive index similar to that of tooth structure. A TRIOS3^® intraoral scanner (3Shape, Copenhagen, Denmark) and an alginate impression were used to duplicate the custom model without orthodontic brackets for complete arch scenarios (both upper and lower arches), n = 5. Subsequently, orthodontic brackets (Ormco^®, Glendora, CA, USA) were attached to the custom model and the TRIOS^® intraoral scanner and alginate impression were used again. Analysis was performed using 3-dimensional (3D) metrology software (GOM inspect^®, GOM GmbH, Braunschweig, Germany) to measure surface deviations between the STL files from the custom model to evaluate and compare their trueness and precision. All data were entered into Microsoft Excel and then transferred to SPSS (Statistical Package for the Social Sciences). The average surface deviations were compared between the TRIOS3^® intraoral scanner and the alginate impression using a repeated measures ANOVA (Analysis of Variance) with adjustment for multiple comparisons using Bonferroni’s correction. There were no significant differences in trueness and precision between TRIOS3^® and alginate impression in full arch models with and without orthodontic brackets. Moreover, the accuracy of all groups was less than 100 microns, which was acceptable. Further in vivo studies are required to confirm these results.