Comparative analysis of volumetric changes between resection volume of oral tongue cancer and post operative volume of radial forearm flaps.

OBJECTIVES: This study investigates the relationship between the total volume of oral tongue cancer pre-operatively and the RFFF volume post-operatively. MATERIALS AND METHODS: A total of 52 DICOM imaging datasets (CT or MRI) of 26 patients were included in this study. The volume of the desired structure was quantified using semi-automatic segmentation using the software ITK-SNAP. All extracted measurements were validated by two further clinicians at separate instances. RESULTS: The variation of MeanVolTu can be predicted by MeanVolFlap moderately reliable with 59.1% confidence (R-Qua: 0.591). ANOVA Testing to represent how well the regression line fits the data, resulted in the overall regression model being statistically significant in predicting the MeanVolTu (p < 0.001). The flap volume may be predicted using the following algorithm: MeanVolFlap0 = 3241,633 + 1, 322 * MeanVolTu. CONCLUSION: The results of this study show positive correlation between tumor volume and flap volume, highlighting the significance of efficient flap planning with increasing tumor volume. A larger extraction volume of the radial forearm free flap from the donor site compromises the forearm more, thus increasing the probability of post-operative complications. CLINICAL RELEVANCE: Radial forearm free flap design in accordance with its corresponding 3D tumor volume.

Indications and surgical technique for distraction osteogenesis of the alveolar bone for augmentation prior to insertion of dental implants.

When bone is limited, short, ultra-short, or narrow implants help to restore oral rehabilitation with an acceptable long-term outcome. This becomes more difficult with severe vertical bone loss. Guided bone regeneration, onlay block transplantation, or sandwich osteotomy have been established to build up these defects. The alternative to the alveolar distraction osteogenesis (ADO) has only been established in some centers, with a standardized protocol. On the one hand, ADO is a biological procedure that allows almost a "restitutio ad integrum" when building up hard and soft tissue. On the other hand, there are clear indications, limitations, and complications of the procedure in the literature. In addition to the literature, concept of Tissue Regeneration by Alveolar Callusdistraction Cologne (TRACC), which has been practiced successfully for over two decades, will be presented for different indications.

Airway-Associated Complications With and Without Primary Tracheotomy in Oral Squamous Cell Carcinoma Surgery.

PURPOSE: This study analyzes postoperative airway management, tracheotomy strategies, and airway-associated complications in patients with oral squamous cell carcinoma in a tertiary care university hospital setting. MATERIAL AND METHODS: After institutional approval, airway-associated complications, tracheotomy, length of hospital stay (LOHS), and length of intensive care unit stay were retrospectively recorded. Patients were subdivided in primarily tracheotomized and not-primarily tracheotomized. Subgroup analyses dichotomized the not-primarily tracheotomized patients into secondary tracheotomized and never tracheotomized. Associations were calculated using regression analyses. A multivariate regression model was used to determine risk factors for secondary tracheotomy. RESULTS: A total of 207 patients were included. One hundred fifty-three patients (73.9%) were primarily tracheotomized. Primarily tracheotomized patients showed longer LOHS [odds ratio (OR) 1.04, 95% confidence interval (CI) 1.01-1.07, P =0.008] but decreased need for reventilation within the intensive care unit stay (OR 0.39, 95% CI 0.15-0.99, P =0.05) compared with not-primarily tracheotomized patients. Within the not-primarily tracheotomized patients, secondary tracheotomized during the hospital stay was needed in 15 of 54 patients (27.8%). In secondary tracheotomized patients, airway management due to respiratory failure was required in 6/15 (40%) patients resulting in critical airway situations in 3/6 (50%) patients. Multivariate regression model showed secondary tracheotomy-associated with bilateral neck dissection (OR 5.93, 95% CI 1.22-28.95, P =0.03) and pneumonia (OR 16.81, 95% CI 2.31-122.51, P =0.005). CONCLUSION: Primary tracheotomy was associated with extended LOHS, whereas secondary tracheotomy was associated with increased complications rates resulting in extended length of intensive care unit stay. Especially in not-primarily tracheotomized patients, careful individualized patient evaluation and critical re-evaluation during intensive care unit stay is necessary to avoid critical airway events.

3D-based buccal augmentation for ideal prosthetic implant alignment-an optimized method and report on 7 cases with pronounced buccal concavities.

OBJECTIVES: Screw-retained restoration of implants is advantageous for biological and esthetic reasons. Due to buccal concavities, however, this preferred type of restoration can only be used in about half of the anterior indications. Based on case series, an optimized method for the treatment of such indications is to be described; the clinical reliability is to be ascertained by means of measurements (before and after augmentation) and assigned to the current literature. MATERIAL AND METHODS: A case series of seven cases with buccal concavities of the anterior alveolar ridge were treated with optimized method, which is presented step-by-step until the prosthetic restoration. The depths of the bone concavities were measured and related to the bone gain after augmentation procedure respectively after implantation. RESULTS: Linear measurements of the buccal concavities showed an average undercut of 4 mm [SD ± 1.13]. After healing period of six months, the buccal concavities could be compensated bony to such an extent that implants could be inserted in correct position and angulation. On average, there was a horizontal bone gain of 3.7 mm [SD ± 0.59]. Even after implantation and another six months of healing, stable bone dimensions could be assumed with an average of 4.3 [SD ± 0.83] mm of bone gain compared to baseline. In six of the seven cases, the favorite screw-retained, one-piece full-ceramic restoration could be fixed on the implants. Due to the implant axis, one case had to be treated with a cemented two-part full-ceramic system. CONCLUSIONS: With the described optimized method the most favorable screw-retained restoration can also be used in situations with unfavorable concavities of buccal bone. Especially for this indication, a special form of the horizontal deficit, the customized bone regeneration with titanium meshes is highly reliable in terms of healing and extent of augmentation. However, long-term results and a study/control group are required to evaluate the effectiveness of the presented protocol. CLINICAL RELEVANCE: Since these situations require an augmentation that is up to 5 mm thick and a procedure that is as minimally invasive as possible appears to be necessary in the visible area, an optimized method is described in this publication.

Volumetric and Morphological Analysis of Mandibular Condyles of Angle Class 2 and 3 Malocclusion Patients.

ABSTRACT: This study was conducted to provide diametric and volumetric data of mandibular condyles from patients with Angle class 2 and 3 malocclusions by semiautomatic segmentation based upon cone-beam computed tomography.Cone-beam computed tomography images of 79 patients were analyzed. By using the open-source software "ITK-SNAP", diametric and volumetric measurements of 158 mandibular condyles were performed. Descriptive statistics were calculated for all normally distributed variables. Correlations between patients with Angle class 2 and 3 were calculated with the independent Student t test. P values P < 0.05 were considered significant.Irrespective of the side, patients with class 2 malocclusion showed smaller mandibular condyles (right: 1.128 ±â€Š0.504 cm3; left: 1.222 ±â€Š0.596 cm3) than patients with class 3 (right: 1.504 ±â€Š0.361 cm3; left: 1.493 ±â€Š0.335 cm3). These results were reproducible also in accordance with the diametric measurement (class 2 right: 16.75 ±â€Š2.72 mm; left: 17.04 ±â€Š3.01 mm) (class 3 right: 18.24 ±â€Š2.54 mm; left: 18.32 ±â€Š2.13 mm). However, volumetric differences were highly statistically significant (right: P = 0.001; left: P = 0.018) while diametric differences were slightly significant for the right and not significant for the left side (right: P = 0.042; left: P = 0.053).Diametric and volumetric analyses offer important additional information based on 3D images of cone-beam computed tomography technology. Significant differences in diameter and volume of mandibular condyles could be assessed between different classes of malocclusion.

A Volumetric and Morphological Analysis of Recurrent Odontogenic Keratocysts by Semiautomatic Segmentation.

PURPOSE: The authors conducted this study to provide morphological and volumetric data of recurrent odontogenic keratocysts of the upper and lower jaw to emphasize risk factors in accordance with their radiological appearance and guide clinical decisions for jeopardized patients. METHODS: By applying the open-source software "ITK-Snap" on cone-beam computed tomography images, volumetric measurements of histopathologically diagnosed recurrent odontogenic keratocysts could be performed. For statistical investigations, descriptive statistics and independent Student t test were performed. The intraclass correlation coefficient was used to assess intra- and inter-rater reliabilities. P values P  < 0.05 were considered significant. RESULTS: Forty patients (24 male and 16 female) were included in this study. Recurrent odontogenic keratocysts had a mean maximum diameter of 28.91 mm ± 12.00 mm and a mean volume of 4.48 cm3 ±â€Š4.29 cm3. According to morphology, irregular shape (P = 0.001; P = 0.005), unclear margin (P = 0.001; P = 0.001), multilocular morphology (P = 0.001; P = 0.001), and cortical bone exceedance (P = 0.001; P = 0.007) are statistically significantly associated with a larger cyst diameter and volume. Furthermore, significant differences by diameter and volume could be shown between patients with and without iliac crest graft reconstruction (P = 0.001; P = 0.001). CONCLUSIONS: Volumetric analysis reveals that recurrent odontogenic keratocysts show large diametric and volumetric extension that leads to complex reconstruction by iliac crest grafts, adding an argument that special attention should be paid to this entity and its recurrence. in case of difficult histopathological examination, lesions with irregular shape and margin, multilocular morphology, cortical bone exceedance, and clinically visible symptoms should be considered for close morphological and volumetric clinico- radiological follow-up.

Volumetric Analysis and Clinical Outcome in 54 Patients with Retrobulbar Hematoma.

PURPOSE: Retrobulbar hematoma (RBH) is a rare but serious vision threatening emergency. We analyze the relationship between hematoma volume, visual impairment and outcome. METHODS: Fifty-four patients with RBH receiving orbital decompression were retrospectively included. Volumetric analysis of RBH was performed by semi-automatic segmentation based on preoperative CT scans using ITK-SNAP software. Best corrected visual acuity (BCVA) measurements were obtained and correlated in 2 groups (no light perception (NLP), severe visual impairment) with the hematoma volume. RESULTS: NLP was documented preoperatively in 5/28 and postoperatively in 9/43 patients. Preoperative NLP was significantly associated with a larger hematoma volume (P = .03) and higher hematoma/orbital volume ratio (P = .03). Postoperative severe visual impairment showed significant associations with a larger hematoma volume (P = .02) as well as higher hematoma/orbital volume ratio (P = .02). CONCLUSION: Eyes with severe visual impairment and large hematoma volumes preoperatively are at high risk of permanent vision loss. Hematoma volume calculation might represent an additional prognostic parameter for visual outcome after RBH.

Cefazolin versus ampicillin/sulbactam as an empiric antibiosis in severe odontogenic neck infection descending from the lower jaw-retrospective analysis of 350 cases.

OBJECTIVES: Odontogenic infections descending from the lower jaw may lead to severe health conditions. Commonly, a biphasic treatment of surgical drainage and antibiotic therapy is conducted. The choice of the administered empiric antibiotic agent remains debatable. MATERIAL AND METHODS: Retrospectively, we analyzed 350 medical records of patients who were consecutively treated with odontogenic infections descending from the lower jaw. All patients received surgical drainage and either cefazolin or ampicillin/sulbactam as empiric antibiosis. In particular, the number of secondary operations, infectious parameters, and length of in-hospital stay were investigated. RESULTS: The most frequently infected space was the perimandibular/buccal space for both groups followed by the submandibular space. Number of revision procedures, early recurrence, and length of stay presented no significant difference between both groups (p > 0.05). Inflammatory parameters (c-reactive protein, leukocytes) similarly decreased in both groups. CONCLUSION: Cefazolin targets the majority of the pathogens detected in severe odontogenic neck infections descending from the lower jaw and reveals comparable results to AMP/S in regard to the inflammatory parameters and in-hospital stay. CLINICAL RELEVANCE: Cefazolin is a feasible empiric antibiosis for odontogenic neck infections descending from the lower jaw if surgical drainage is performed.

Anatomical and Volumetric Analysis of the Sphenoid Sinus by Semiautomatic Segmentation of Cone Beam Computed Tomography.

ABSTRACT: This investigation was performed to analyze and evaluate anatomical and volumetric data of the sphenoid sinus by semiautomatic segmentation of cone beam computed tomography (CBCT) datasets.This analysis was carried out on cone beam computed tomography images of 100 patients. By using the discretionary software "ITK-Snap", the volumetric investigation of 197 sphenoid sinuses was conducted. The statistical analyses were carried out by using the paired and independent Student t-test. In addition, the Pearsons chi-square test was performed. P values P < 0.05 were considered significant.The volumetric mean was 4.438 ±â€Š2.434 cm3 for the right and 4.809 ±â€Š3.000 for the left side. Results did not indicate statistically significant differences according to the side, irrespective of gender (P > 0.05). The further investigation of differences between male and female patients did assess significant results (P < 0.05), males (10.477 ±â€Š3.851 cm3) present a larger total sinus volume than females (8.219 ±â€Š3.574 cm3). In accordance to patients' age (median 54 years), smaller volumes were related to younger patients and larger volumes to older ones. But, no statistically significant results in accordance to age could be detected (χ2 = 1.258; P > 0.05).Endoscopic sinus surgery of the vulnerable and intricate anatomy of the sphenoid sinus requires an explicit knowledge and orientation about the anatomical variations such as septums and volumetric capacity. Concerning this matter, semiautomatic segmentation of CBCT images can aid the surgeon in preoperative planning. Our investigation shows that a small sinus volume, that is, affecting female patients and a complex sinus anatomy by the occurrence of a septum, especially located close to neurovascular structures could essentially aggravate endoscopic sphenoid sinus surgery. In this regard, volumetric analysis of the sphenoid sinus by CBCT images can provide presurgical information and facilitates an individualized treatment.

#facialtraumasurgery: Educational Content of Instagram as a Social Media Source for Facial Trauma Surgery.

ABSTRACT: With an uprising influence of social media platforms like Instagram during the last decade, medical and healthcare related posts have accumulated majorly. In particular the head and face characterizes and signifies each individual's human character, which may be the reason why numerous posts are shared on social media platforms. The purpose of this investigation was to assess the content associated with facial trauma surgery and evaluate its educational quality.The authors performed a retrospective investigation on 550 Instagram posts by #facialtraumasurgery due to number of "likes," comments, type of post, language, its purpose, and source. Furthermore, posts were evaluated due to their educational quality by 3 examiners of different educational levels.The majority of posts showed 0 to 50 "likes" and 0 to 5 comments in English language. The major post type were single photographs (289; 52.5%), multiple photographs (188; 34.2%), videos (73; 13.3%) and predominantly case reports (233; 42.4%). The source was 322 (58.5%) posts by surgeons, followed by 185 (33.6%) clinic posts. Only 10% to 18% of the posts were rated "excellent." Interrater reliability between all 3 examiners presented a high concordance with 89% (P = 0.000).Our study presents an analysis of quantity and quality of social media content according to facial trauma surgery. It supports the deduction that most of the content on Instagram is shared by patients and unclear sources and thus is limited informative. Nevertheless, influence of social media on medical information is increasing and practitioners have to face its effect on their patients.

Mandible Fractures Associated With the Introduction of an E-Scooter-Sharing System.

ABSTRACT: With the introduction of an e-scooter-sharing system in Germany, standing electric scooters became popular modes of transportation in many urban areas. But the increase in popularity has resulted in an increase in traumatic injuries associated with e-scooter accidents. The purpose of this investigation was to determine the common fracture pattern of patients with mandible fractures as a result of an electric scooter accident. The authors performed a retrospective investigation of 52 patients who were admitted to the trauma unit of an oral and maxillofacial department from June until November 2019 with a fracture of the mandible. Our study investigated the first 6 months of e-scooter sharing system in a major city with more than 1 million inhabitants. Our cohort consists of 52 patients, 38 males, and 14 females with a mean age of 37 years. E-scooter related mandible fractures were with 21% the third biggest group, after physical assault and falls. 45% of these patients were intoxicated by alcohol. Furthermore, the majority of e-scooter patients presented more than one fracture of the mandible (73%). For our cohort, a typical combination of a symphysis or body fracture and bilateral affected ramus and/or condyle was the prevalent recorded fracture combination (55%) of e-scooter related traumata. Small scooter wheels, a speed of 15 miles or 20 kilometers per hour and the individual clinging to the handlebar falling predestinate these vehicles for accidents with craniofacial trauma. Among all cranio-facial traumas mandible fractures were mostly documented for e-scooter accidents. The severity of e-scooter related mandible fractures and their fracture pattern should be recognized by trauma units.

Survival outcomes after surgical treatment of oral squamous cell carcinoma.

OBJECTIVE: To identify the clinicopathological parameters that influence survival in patients with oral squamous cell carcinoma, in order to allow for the development of individualized surveillance programmes and reduce the delay in diagnosis of recurrence. MATERIALS AND METHODS: Retrospective chart review of 553 patients with a treatment-naïve primary oral squamous cell carcinoma, who underwent primarily curative intended surgery. Exclusion criteria were neoadjuvant radio(chemo)therapy, follow-up < 1 year, perioperative death, inoperable disease, synchronous multiple malignancies and inadequate information on clinicopathological parameters. RESULTS: The clinicopathological factors that influence overall survival, disease-free survival and locoregional control were calculated. In the multivariate survival analysis, the occurrence of recurrence, presence of extracapsular spread, T- and N-classification were shown to be independent risk factors for overall survival. CONCLUSION: The identification of these risk factors can lead to the development of individualized follow-up programmes based on risk stratification. This allows for the earliest possible diagnosis of relapse which is essential to offer the patient a realistic second treatment chance and to improve survival rates.

Oral recipient site infections in reconstructive surgery - impact of the graft itself and the perioperative antibiosis.

OBJECTIVES: This study was designed to assess the influence of peri/post-operative antibiotic prophylaxis (POABP) and the reconstructive graft itself on recipient sites infections in head and neck surgery. MATERIALS AND METHODS: In this retrospective cohort study, 322 consecutive patients with reconstructive surgery were investigated. The primary objective was to analyze the differences of commonly applied reconstructive grafts on the occurrence of oral recipient site infections. Moreover, differences of POABP regimes (namely: ampicillin/sulbactam, 2nd generation cephalosporins, clindamycin) and antibiotic alternatives were investigated. In addition, patients' length of in-hospital stay was analyzed in regard to reconstructive graft and POABP regime. RESULTS: The free radial forearm flap and split-thickness skin graft presented significantly less recipient site infections and shorter length of in-hospital stays (LOS) in comparison to further six reconstructive technique with pedicled tissue transfer or bone transfers. LOS was significantly shorter for patients with ampicillin/sulbactam than with 2nd generation cephalosporins as POABP. 91% of the harvested pathogens (n=193) were susceptible to the combination of 2nd and 3rd generation cephalosporins. Secondly, 92 out 113 (81%) harvested pathogens presented susceptibility to moxifloxacin. CONCLUSION: Smaller tissue transfers are less prone to infections of the recipient site and present low LOS. For an POABP regime, the combination of 2nd and 3rd generation cephalosporins presents substantial results in recipient site infections. In cases of allergy, potential pathogens show adequate susceptibility to moxifloxacin. CLINICAL RELEVANCE: A combination of 2nd and 3rd generation cephalosporins may be used to prevent recipient sites in head and neck surgery.

Volumetric Analysis of the Pterygopalatine Fossa by Semiautomatic Segmentation of Cone Beam Computed Tomography.

The aim of this study was to provide volumetric data of the pterygopalatine fossa by semiautomatic segmentation based upon cone beam computed tomography.Cone beam computed tomography (CBCT) images of 100 patients were analyzed. By using the open source software "ITK-Snap," the volumetric measurements of 200 pterygopalatine fossae were performed. For statistical investigations paired t test, and independent Student t test were performed. Also, the Pearsons chi-square test was applied. P values P < 0.05 were considered significant.The mean volume was 578.376 mm for the right and 560.979 mm for the left side. The results indicated statistically significant differences according to the right and the left pterygopalatine fossa, regardless of gender (P < 0.05). The analysis of differences between males and females did not show any significant results (P > 0.05), although males present a slightly larger volume than females. According to the median age (59 years), younger patients presented smaller volumes, whereas older patients presented larger volumes. Nevertheless, no statistically significant differences according to age (χ = 3.520; P > 0.05) could be found.Clinical intervention with the application of local anesthetics into the complex and vulnerable anatomy of the pterygopalatine fossa makes a thorough knowledge about the volumetric capacity indispensable. Therefore, the semiautomatic segmentation of CBCT images provides a useful, available and validated tool. Our results show that a final injected anesthetic volume larger than 1 ml exceeds the pterygopalatine fossa capacity considerably and could cause complications. To prevent this, volumetric analysis of this region can provide further information and enables an individualized patients' treatment.

Analysis of the Pterygomaxillary Fissure for Surgical Approach to Sphenopalatine Ganglion by Radiological Examination of Cone Beam Computed Tomography.

The pterygopalatine fossa (PPF) is a complex and paired anatomical structure located at the skull base. A clinically and surgically relevant structure located in the pterygopalatine fossa is the sphenopalatine ganglion. Electrical stimulation of the sphenopalatine ganglion is one possible method of treating cluster headache. The pterygomaxillary fissure (PMF) defines the pterygopalatine fossa laterally and determines the surgical approach. As part of preoperative surgical planning, each patient undergoes a preoperative head computed tomography or a cone beam computed tomography. In our study cone beam computed tomography images of 90 male and 110 female PMF were analyzed. Generally, males have a wider fissure than females. Moreover, a significant inter-subject difference could be shown between males and females. The analysis of the right and left PMF according to gender and age does not show any significant intra-subject differences. Following an established protocol for high-resolution CT images the measurements were classified into four fissure types and also analyzed according to gender and age. Fissure type I is significantly more often present in males, whereas the smaller fissure types (II, III, and IV) are significantly more often found in females. Older patients presented statistically significant more often with type I, whereas the younger patients showed more often the narrower types II and IV. Due to the fact that narrow fissures smaller than 2 mm could limit the insertion of neurostimulator implants in the PPF, special attention should be paid to females and younger patients during preoperative planning.

Intraoperative Ultrasound Control of Zygomatic Arch Fractures: Does Additional Imaging Improve Reduction Quality?

PURPOSE: Intraoperative navigation to assess anatomic reduction is the general trend in maxillofacial trauma surgery. The aim of this study was to evaluate the closed reduction outcome of isolated zygomatic arch fractures using ultrasound compared with palpation control. MATERIALS AND METHODS: In this case-and-control study, the authors identified consecutively treated patients who underwent closed reduction of isolated zygomatic arch fractures using the Volkmann reposition hook with intraoperative ultrasound. Controls were patients with the same diagnosis and surgical procedure without ultrasound imaging. Pre- and postoperative radiographic datasets were geometrically analyzed. The outcome variables postoperative cortical step, persistent postoperative displacement, and overall grade of reduction were compared in the 2 study groups. Subgroups of fracture patterns were classified as M-shaped or variable. Statistical analysis was performed using t test for continuous variables and 2-sided χ2 test for categorical variables, with a P value less than .05 defined as significant. RESULTS: Sixteen cases with intraoperative ultrasound and 60 controls were identified from the institution's database. The angle of postoperative displacement was significantly decreased in the ultrasound group for all fractures (2.4° vs 5.3°; P = .004) and the variable fracture type (1.6° vs 8.1°; P = .005). Overall grade of reduction was improved in the ultrasound group for all fractures (P = .03) but with no difference solely for M-shaped fractures (P = .37). CONCLUSIONS: Although reduction control using palpation and probing using the Volkmann hook showed satisfactory results for M-shaped fractures, additional intraoperative ultrasound imaging showed promise for increasing success rates for the variable type of zygomatic arch fracture.

Osteotomy speed, heat development, and bone structure influence by various piezoelectric systems-an in vitro study.

OBJECTIVES: The aim of this in vitro study was to evaluate osteotomy speed, heat development, and bone structure influence from osteotomies performed by various piezoelectric devices and insert tips. These devices and tips were compared among each other with regard to conventional rotatory and oscillating systems with special focus on the insert tip design and thickness. MATERIAL AND METHODS: The osteotomies were conducted on porcine ribs utilizing 12 different insert tips (straight and angulated) and three conventional systems. After time and temperature measurements, histological analysis was carried out. Light microscopy was used to evaluate the roughness of the osteotomic surface and to search for indications of thermal bone necrosis. A special software analyzing tool was employed to determine cutting width (mm) and debris (%). RESULTS: All piezoelectric tips created smooth cuts. Cutting widths in general were wider than the actual insert tip size with a tendency for narrow straight insert tips producing relatively wide osteotomies, whereas narrow angulated inserts produced relatively small osteotomies. None of the samples demonstrated distinct indication of necrosis. Overall, there was only a small amount of debris in all osteotomy gaps. Conventional rotatory saws were faster and created less heat compared to all tested piezoelectric systems. Straight tips proved faster osteotomy speed than angulated tips. Thin insert tips indicated to have a positive correlation to osteotomy time and performed faster than conventional microsaw. The average temperature rise was lower when using conventional systems, but critical exceeding temperatures were only observed in short-time exceptional cases. In general, temperature rise was less when using angulated inserts. CONCLUSION: All tested tips are appropriate for bone surgery. Only small differences were found among the piezoelectric insert tips. Although conventional rotatory systems in general performed faster osteotomies, special designed and thin piezoelectric insert tips seem to have a positive influence on osteotomy speed. Ultimately, none of the tested devices or inserts combined all best features of speed, heat development, bone structure influence, and safety. CLINICAL RELEVANCE: Narrow and straight piezoelectric insert tips demonstrated reduced osteotomy times. Nevertheless, a combination of conventional and piezoelectric systems in clinical practice might be the best way to work time-efficient, patient-oriented, and safe. The choice of instrument should be based on clinical experience of the user and should be evaluated individually depending on the case.

A novel histopathological scoring system for patients with oral squamous cell carcinoma.

OBJECTIVES: Tumor invasion into blood and/or lymphatic vessels, perineural invasion, and histopathological grading are evaluated to assess the biological aggressiveness of oral squamous cell carcinoma (OSCC). We aim to assess the prognostic impact of a novel scoring system, based upon the aforementioned histological parameters. MATERIALS AND METHODS: Retrospective chart review of 334 patients with treatment-naive squamous cell carcinoma of the oral cavity. Statistical analysis was performed using univariate and multivariate analysis. Histological grade G1 or G2 were assigned 0 points and G3 or G4 1 point. Invasion of the lymphatic vessels, blood vessels, or perineural space was given 1 point. Zero points were given, when invasion was not detectable. The final score was conducted through addition of each parameter. Therefore, our scoring system ranged between 0 and 4 points. RESULTS: T-classification (p < 0.001), N-classification (p < 0.001), UICC stage (p < 0.001), extracapsular spread (p < 0.001), locoregional recurrence (p < 0.001), and overall survival (p < 0.001) were significantly associated with the OSCC-Histoscore. In multivariate analysis, T-classification (p = 0.001), N-classification (p = 0.039), resection margins (p = 0.038), and OSCC-Histoscore (p < 0.001) were independent prognostic markers for overall survival rate. CONCLUSION: Our presented OSCC-Histoscore serves as a strong independent prognostic parameter for 5-year overall survival (OS) and predicts OS better than T-classification, N-classification, and resection margins. CLINICAL RELEVANCE: Our presented histoscore improves prediction of the overall survival of patients with OSCC.

Incidental findings on craniomaxillofacial cone beam computed tomography in orthodontic patients.

PURPOSE: Cone beam computed tomography (CBCT) in orthodontics is increasingly used for detecting impacted or ectopic teeth or for orthognathic and cleft lip and palate treatment. Incidental findings (IFs) are frequently encountered and often relevant. The aim of this study was to detect the prevalence of relevant pathologies on CBCT scans of orthodontic patients. METHODS: Over a 6-year period, incidental imaging findings were analyzed in 345 CBCT scans (181 men; 164 women; age 16.3 ± 8.4 years), and subdivided into dental (Group 1), skeletal (Group 2), sinunasal (Group 3), and infrequent other pathologies (Group 4). RESULTS: A total of 502 IFs were detected in 345 patients (1.4 IFs per patient, on average). Most IFs were found in Group 1 (358 IFs; 71.3%), followed by Group 2 (129 IFs; 25.7%), Group 3 (14 IFs; 2.8%), and Group 4 (1 IF; 0.2%). There were 119 (34.5%) patients with a missing wisdom tooth, 94 (27.3%) with dental aplasia, 71 (20.6%) with dislocations, 33 (9.6%) with partial opacifications, and 27 (7.8%) with signs of sinusitis. CONCLUSIONS: This study found that IFs in orthodontic CBCT scans are frequently encountered, even in younger orthodontic patients. When interpreting CBCT scans, orthodontists should be aware of potential relevant IFs that may require further investigation, change patients' treatment or affect their quality of life.

The role of adjuvant treatment in early-stage oral cavity squamous cell carcinoma: An international collaborative study.

BACKGROUND: Up to half of patients with oral cavity squamous cell carcinoma (OCSCC) have stage I to II disease. When adequate resection is attained, no further treatment is needed; however, re-resection or radiotherapy may be indicated for patients with positive or close margins. This multicenter study evaluated the outcomes and role of adjuvant treatment in patients with stage I to II OCSCC. METHODS: Overall survival (OS), disease-specific survival, local-free survival, and disease-free survival rates were calculated with Kaplan-Meier analysis. RESULTS: Of 1257 patients with T1-2N0M0 disease, 33 (2.6%) had positive margins, and 205 (16.3%) had close margins. The 5-year OS rate was 80% for patients with clear margins, 52% for patients with close margins, and 63% for patients with positive margins (P < .0001). In a multivariate analysis, age, depth of invasion, and margins were independent predictors of outcome. Close margins were associated with a >2-fold increase in the risk of recurrence (P < .0001). The multivariate analysis revealed that adjuvant treatment significantly improved the outcomes of patients with close/positive margins (P = .002 to .03). CONCLUSIONS: Patients with stage I to II OCSCC and positive/close margins have poor long-term outcomes. For this population, adjuvant treatment may be associated with improved survival. Cancer 2018;124:2948-55. © 2018 American Cancer Society.