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Oral and maxillofacial surgeons frequently encounter patients who require extractions following exposure to head and neck radiation, and they must assess the risk of extraction and consider alternatives such as deliberate root retention. The purpose of this study was to determine whether dose volume would be a better predictor for osteoradionecrosis (ORN) than total dose.This is a retrospective cohort study of patients diagnosed with ORN following head and neck radiation (administered between January 2006 and December 2018) and a comparison group selected based on site and dosage who did not develop ORN. The predictor variables were total radiation dose and mandibular dose volume, and the outcome variable was ORN occurrence. Covariates included age, sex, cancer stage and site, radiation therapy type, smoking status, alcohol use, adjuvant chemotherapy use, medical comorbidities, and concomitant tumor surgery. Logistic regression models were employed and area under receiver operating characteristic curve (AUROC) and model accuracy (Acc) were used to determine the better predictor.A total of 56 patients were included in the study: 27 ORN positive (ORN+) and 29 matched controls who did not develop ORN (ORN-). Most patients were male (76.8%), considered smokers (78.6%), used alcohol (80.4%), were in stage IV (66.1%), received chemotherapy (75.0%), and received intensity modulated radiation therapy radiation (55.4%). The statistical models with V50 Gy (cc) and V65 Gy (cc) dosage variables exhibited greater predictability of ORN occurrence than total dose (AUROC: 0.90 vs 0.76 and model accuracy: 0.82 vs 0.75, respectively).The results suggest that following head and neck radiation, dose volume may be a better predictor of ORN risk than total dose. This finding is significant, both for the oral and maxillofacial surgeon who is preoperatively assessing ORN risk following radiation exposure, and for the radiation oncologist striving to minimize the risk associated with their treatment.

Purpose: The purpose of this paper is to describe a recent case of central giant cell granuloma (CGCG) that rapidly progressed post corticosteroid treatment while also providing a review of the existing literature on CGCG of the head and neck (HNCGCG), with particular emphasis on extra-mandibular and maxillary cases. Materials and Methods: The investigators designed and implemented a 32-year review of literature, using the online databases: PubMed, Google Scholar, Medline, and Proquest. The total number of cases analyzed was 55 (42 case reports; 3 case series; 8 comparative studies; 1 retrospective cohort). Case Presentation: We present a case of a CGCG in a 10-year old male. The lesion originated in the right anterior mandibular body and progressed after corticosteroid treatment. Diagnosis was made using a combination of imaging and histology. A timely debulking procedure of the hemi-mandible was performed and there was no recurrence of the lesion at follow up. Results: The average age at the time of diagnosis of CGCG was 27.5 years. HNCGCG was most commonly detected in the jaw (43.1%), but was also found in the temporal bone (33.3%). The most frequently employed treatment modality was complete surgical excision (76.9%). 93.2% of patients were alive with no evidence of disease at follow-up, while 6.8% of patients exhibited recurrence at follow-up. The median follow up was 13 months. Conclusion: It is important for clinicians to recognize that CGCGs are capable of manifesting outside of the jaw. CGCG should be considered in the differential diagnosis of non-odontogenic radiolucent lesions, especially in young patients. CGCGs also need to be distinguished from brown tumor of hyperparathyroidism (BTH) and giant cell tumors, which are histologically similar.

Objective The objective of this study was to assess characteristics of patients with mandibular osteoradionecrosis (ORN) of severity necessitating segmental mandibulectomy and osteocutaneous free flap reconstruction. Study Design This study is a retrospective review of patients who underwent free flap reconstruction of the mandible at the UCLA Medical Center between January 2016 and February 2020 secondary to ORN. Results Twenty-nine charts with detailed dental and medical records were identified. Hypertension was reported in 14 of 29 patients, diabetes in 2 of 29, osteoporosis in 2 of 29, antiresorptive use in 3 of 29, tobacco use in 15 of 29, and alcohol use in 19 of 29. Twenty-three patients initially had stage III-IV cancer. The median radiation dose was 68 Gy and median time to ORN was 5.2 years. Chemotherapy was given in 21 patients and 4 had previous mandibular surgery. Twelve of 29 patients had surgical procedures identified as the causative factor and 17 of 29 occurred spontaneously. Median decayed, missing, and filled teeth score was 17 and 17 of 29 patients had grade II-IV periodontitis. Periodontitis was present in 8 of 17 of spontaneous and 1 of 12 of surgery cases. Twenty-five of 29 cases occurred in the same oral sextant as the tumor. Conclusion Severe ORN occurred at doses >60 Gy in most cases. Location of the primary tumor was predictive of site of ORN and only molars were involved when precipitated by tooth extraction. Risk of ORN persists indefinitely.

Objective : The purpose of this multicenter retrospective study was to report the clinical and radiological features of 92 glandular odontogenic cysts (GOCs) diagnosed over a 20-year period. Study Design : Histologically confirmed cases of GOC were retrospectively reviewed from four Oral Pathology laboratories in South Africa and Brazil to categorize the clinical and radiological spectrum of GOCs. Results : The mean age of patients was 46 years (range 17-87) with a male-to-female ratio of 1.2:1. GOCs had a mandibular predilection (68%), with 42% of all cases located anteriorly. Additionally, 42% of cases crossed the midline. Radiologically, most lesions were unilocular (53%) and uniformly radiolucent (97%), with well-demarcated borders (93%). Cortical expansion (62%), loss of cortical integrity (71%), and maxillary sinus (67%) and nasal cavity encroachment (72%) were common findings. Significant differences in lesions between the two countries were discovered in sex predilection, clinical signs and symptoms, and lesion locations within the mandible and maxilla. Conclusion : GOCs present with a wide spectrum of clinical and radiological features, ranging from cysts with typical GOC-like presentations to more aggressive lesions. The need for advanced imaging in the surgical planning of GOCs exhibiting radiological signs of aggression is justified based on the high recurrence rate.

Glandular odontogenic cyst (GOC) is a very rare jaw cyst accounting for 0.2% of all odontogenic cysts. It presents usually in adults with a slight male predominance. It shows radiological, histopathological and even immunohistochemical overlap with low grade intraosseous mucoepidermoid carcinoma (MEC) but their distinction is crucial. A 57-year-old woman with bilocular radiolucency in the anterior mandible crossing the midline is described here. Microscopy features were consistent with glandular odontogenic cyst but multiple MEC-like islands were seen in the capsule, creating a diagnostic head trip with low grade intraosseous MEC. However, the absence of cellular atypia and epidermoid and intermediate cells led to a final diagnosis of GOC, with close follow-up of the patient recommended. This rare finding shows the relation between GOC and MEC or the origin of MEC from GOC.

Management of central giant cell granuloma (CGCG) presents a clinical challenge. While eradicating a lesion known for its high recurrence rate calls for radical surgical approaches, these cause significant esthetic and functional impairment. We present an eight-year-old boy suffering from an extraordinarily large CGCG expanding into the mandible and base of the mouth in the whole anterior region. Combined treatment with surgical intervention and corticosteroid application was successfully applied, and all six attached dental germs could be preserved. Different approaches for clinical management in pediatric cases are discussed.

Purpose: Osteoradionecrosis (ORN) of the mandible represents a severe, debilitating complication of radiation therapy (RT) for head and neck cancer (HNC). At present, no normal tissue complication probability (NTCP) models for risk of ORN exist. The aim of this study was to develop a multivariable clinical/dose-based NTCP model for the prediction of ORN any grade (ORNI-IV) and grade IV (ORNIV) after RT (+/- chemotherapy) in patients with HNC.Methods and Materials: Included patients with HNC were treated with (chemo-)RT between 2005 and 2015. Mandible bone radiation dose-volume parameters and clinical variables (ie, age, sex, tumor site, pre-RT dental extractions, chemotherapy history, postoperative RT, and smoking status) were considered as potential predictors. The patient cohort was randomly divided into a training (70%) and independent test (30%) cohort. Bootstrapped forward variable selection was performed in the training cohort to select the predictors for the NTCP models. Final NTCP model(s) were validated on the holdback test subset.Results: Of 1259 included patients with HNC, 13.7% (n = 173 patients) developed any grade ORN (ORNI-IV primary endpoint) and 5% (n = 65) ORNIV (secondary endpoint). All dose and volume parameters of the mandible bone were significantly associated with the development of ORN in univariable models. Multivariable analyses identified D30% and pre-RT dental extraction as independent predictors for both ORNI-IV and ORNIV best-performing NTCP models with an area under the curve (AUC) of 0.78 (AUCvalidation = 0.75 [0.69-0.82]) and 0.81 (AUCvalidation = 0.82 [0.74-0.89]), respectively.Conclusions: This study presented NTCP models based on mandible bone D30% and pre-RT dental extraction that predict ORNI-IV and ORNIV (ie, needing invasive surgical intervention) after HNC RT. Our results suggest that less than 30% of the mandible should receive a dose of 35 Gy or more for an ORNI-IV risk lower than 5%. These NTCP models can improve ORN prevention and management by identifying patients at risk of ORN. (C) 2021 The Author(s). Published by Elsevier Inc.

To evaluate the effectiveness of non-surgical treatment as an alternative in the management of central giant cell granuloma (CGCG). A literature search was carried out in accordance with the PRISMA statement in order to answer the question “Are non-surgical treatments effective as an alternative in the treatment of CGCG?”. Two examiners independently assessed eligibility, risk of bias, and extracted data, which included therapeutic protocol, side effects, and need for surgical supplementation. Among 1712 studies, 15 were included, totaling 145 patients. Calcitonin, intralesional corticosteroids, and denosumab were the medications used. For calcitonin (n = 61), complete remission was found in 30 cases. For intralesional triamcinolone (n = 68), reduction in size was observed in most cases (n = 39). Four cases received subcutaneous denosumab and showed absence of active bone metabolism in the region, of which three presented ossification. Combination of drug therapies (n = 29) was reported in one study and included subcutaneous interferon and oral imatinib. More and less side effects were found for interferon and corticosteroids, respectively. Forty percent of patients required additional surgical treatment. Despite the side effects presented and the need for additional surgery in some patients, in general, all non-surgical treatments could provide positive results as an alternative for the management of CGCG, especially with regard to reducing the size of the lesion. CGCG is a benign bone lesion that mainly affects young individuals. Although the most common therapy is surgery, its contraindication in some patients, the large extension, and high recurrence rate of the aggressive variant have led the search for non-surgical therapies.

Objective This systematic review assessed the radiographic extent of maxillofacial Gorham's disease and its impact on recurrence. Study Design PubMed and Cochrane databases were searched. The key words were (Gorham Disease OR Vanishing Bone Disease OR Gorham Stout Syndrome) AND (Jaw OR Maxilla OR Mandible OR Maxillofacial). Results Forty-one cases from 39 articles were included. Based on radiographic extent, the lesions were classified as large or small. Most cases occurred in the mandible (24), followed by a combination of maxilla and/or mandible and other bones (12), both mandible and maxilla (3), and maxilla only (2). Only mandibular cases were analyzed for radiographic extent. Of the 24 mandibular lesions, 16 were large and 8 were small. Nine of the large lesions occurred in the young age group with 2 recurrences, followed by 5 in the middle-aged group with 1 recurrence. Small lesions were nearly equally distributed over the age groups, with 2 recurrences in the middle-aged group and 1 recurrence in the adult age group. Age, sex, and lesion size had no significant effect on recurrence. Conclusions Radiographic extent of the lesion does not impact recurrence, suggesting a possible existence of aggressive and nonaggressive variants of maxillofacial Gorham's disease.

A 23-year-old man presented with an irritating sensation at the third molar on the left side of the mandible and a bad taste in his mouth. Radiographic and histopathological examination revealed the abnormality was caused by a paradental cyst. The paradental cyst is located distal to a lower third molar and, together with the mandibular buccal bifurcation cyst, belongs to the inflammatory collateral cysts. Treatment consists of enucleation of the cyst and removal of the lower third molar. Recurrences do not occur.Een 23-jarige man presenteerde zich met een irriterende sensatie ter plaatse van gebitselement 38 en een vieze smaak. Na röntgenologisch en histopathologisch onderzoek bleek de afwijking te berusten op een paradentaire cyste. De paradentaire cyste is distaal van een derde ondermolaar gelegen en behoort samen met de mandibulaire buccale bifurcatie cyste tot de inflammatoire collaterale cysten. Behandeling bestaat uit enucleatie van de cyste en verwijdering van de derde ondermolaar. Recidieven komen niet voor.

Mandibular buccal bifurcation cyst is a rare inflammatory odontogenic cyst. We reported two cases who complained of painful swelling of extraoral soft tissue. Intraoral examination revealed the partially erupted mandibular first molar. Cone beam computed tomography showed a well-defined cystic lesion surrounding the first molar. Histopathologic images showed the cyst wall was infiltrated by a large number of plasma cells, neutrophils and eosinophils, and lined with a thin layer of non-keratinized stratified squamous epithelium. Finally, the two patients were diagnosed as mandibular buccal bifurcation cyst and treated with cyst enucleation and curettage.

动脉瘤样骨囊肿（aneurysmal bone cysts，ABC）好发于儿童和青少年的长骨，原发于颅面骨的ABC相对罕见。本文报道1例发生于6岁儿童下颌骨的囊肿性病变，描述其影像学、病理形态学特征以及分子检测发现USP6基因重排，最后确诊为下颌骨ABC。第5版WHO骨和软组织肿瘤分类把ABC归属于富于破骨巨细胞的病变，多伴有USP6基因重排，是一种良性肿瘤。发生于手足小骨的巨细胞病变也具有USP6基因重排，第5版WHO将其也归于ABC。本文关注颌骨富于巨细胞的几种病变的诊断与鉴别诊断，强调组织形态学、分子检测和影像学相结合正确诊断ABC的重要性。.

A standard treatment for osteoradionecrosis (ORN) has not yet been established because of the diversity. Therefore, identifying the risk factors for a poor prognosis is essential. This study retrospectively investigated the factors associated with the prognosis of ORN in 68 patients. Relevant clinical data of all patients were obtained. Of the patients, 16 who underwent extensive surgery underwent histopathological analysis. The necrotic changes of the anterior and posterior margins in the cortical and cancellous bones were investigated. Multivariate analyses showed statistically significant associations between poor prognosis in patients with ORN and high radiation dose (hazard ratio [HR] 1.15), orocutaneous fistula (HR 2.93), and absence of sequestration (HR 2.49). Histopathological analysis showed a viable anterior margin of the middle portion of the cortical bone for all recovered cases; in contrast, most cases (75%) with a poor prognosis showed necrotic changes. The anterior margin of the cancellous bone was viable and resilient to high irradiation, regardless of the prognosis. These results suggest that patients with orocutaneous fistula should receive early surgical intervention, even if the affected area is limited or asymptomatic. In extensive surgery, a sufficient safety margin of necrotic bone, particularly in the anterior region, is required to improve the prognosis.

This study enrolled patients with stage 3 osteoradionecrosis. There were three treatment modalities: antibiotics, hyperbaric oxygen therapy (HBOT), and surgery. Complete healing was the primary outcome. Multiple logistic regression analysis demonstrated that surgery with HBOT improved wound healing better than HBOT alone.

BACKGROUND Mandibular osteoradionecrosis (ORN) is a devastating complication secondary to the radiotherapy of head and neck cancer. The nutritional status of ORN patients is compromised, but remains rarely studied. We aimed to evaluate the overall nutritional status of patients with ORN and explore the risk factors behind poor nutrition. METHODS This is a single-institution cross-sectional study. Patients diagnosed with ORN were consecutively recruited in a tertiary teaching hospital from July 2017 to August 2019. Multiple laboratory markers and physical indicators were examined to profile their nutritional status. The potential risk factors of poor nutrition were explored by logistic regression. RESULTS A total of 107 patients with ORN were recruited. Among them, almost all patients (95.3%) had at least one laboratory marker lower than the normal physiological range. A total of 40 (37.5%) patients were categorized as undernutrition, who had lower serum albumin (mean difference: 1.8 ± 0.8 g/L; p = .02), prealbumin (mean difference: 26.8 ± 10.8 mg/L; p = .02), and BMI (3.8 ± 0.4 kg/m2 ; p

To assess whether the administration of meloxicam before head and neck radiotherapy reduces the risk of mandibular osteoradionecrosis in rats. Sixty male Wistar rats were randomly divided into 6 groups (n = 10) according to the meloxicam administration and radiation therapy: control (C), irradiated (I), single dose of meloxicam (M1), single dose of meloxicam and irradiated (M1I), triple dose of meloxicam (M3), triple dose of meloxicam and irradiated (M3I). Meloxicam was administrated (20 mg/kg per dose) 1 h before the radiation therapy (single dose of 20 Gy) and 24 h and 48 h after the radiation therapy for groups with two additional doses. Ten days after the radiation therapy, the three right mandibular molars were extracted from all rats, who were euthanatized after 21 or 35 days (n = 5 per group). The mandibles were assessed by macroscopic evaluation and micro-CT analysis. The right hemimandibles of the irradiated groups revealed macroscopic signs of osteoradionecrosis, and those of the non-irradiated groups revealed complete gingival healing. A significant delay in alveolar socket healing in all irradiated groups was observed in the micro-CT assessment regardless meloxicam treatment. The administration of meloxicam before head and neck radiotherapy does not reduce the risk of mandibular osteoradionecrosis when associated to dental extractions. Since meloxicam has been shown to be a potential radiation-protective agent, and osteoradionecrosis physiopathology is believed to be related to an inflammatory process, possible interactions are relevant to be investigated.

Purpose The aim of this study was to examine the long-term results of mandibular dentigerous cysts treated with decompression using a custom-made appliance. Patients and Methods This retrospective study included 34 patients with dentigerous cysts who were treated as outpatients at the Faculty of Dentistry, Marmara University. Medical history, complaints, intraoral and extraoral clinical findings, treatment time, and complications of these patients were collected. Results The average age of the patients was 7.94 years. Three tooth buds (canine, first permanent premolar [P1], and second permanent premolar) in 2 cases, two tooth buds in 7 cases (P1 and second permanent premolar in 6 cases and P1 and canine in 1 case), and one tooth bud in 25 cases were related to the cyst. The mean decompression time was 5.97 months (range, 3 to 9 months). No major complications occurred during or after decompression. No evidence of infection, breakdown and/or dehiscence of the soft tissue, or inferior alveolar nerve paresthesia was observed. The complications and complaints were minor and straightforward to resolve. Conclusions Decompression is a very effective and successful method for the treatment of mandibular dentigerous cysts.

PURPOSE: We aim to characterize the quantitative dynamic contrast-enhanced (DCE) magnetic resonance imaging (MRI) parameters associated with advanced mandibular osteoradionecrosis (ORN) compared with the contralateral normal mandible. METHODS AND MATERIALS: Patients with a diagnosis of advanced ORN after curative-intent radiation treatment of head and neck cancer were prospectively enrolled after institutional review board approval and study-specific informed consent were obtained. Quantitative maps generated with the Tofts and extended Tofts pharmacokinetic models were used for analysis. Manual segmentation of advanced ORN 3-dimensional volume was done using anatomic sequences to create ORN volumes of interest (VOIs). Subsequently, normal mandibular VOIs were segmented on the contralateral healthy mandible of similar volume and anatomic location to create control VOIs. Finally, anatomic sequences were coregistered to DCE sequences, and contours were propagated to the respective parameter maps. RESULTS: Thirty patients were included. The median time to ORN diagnosis after completion of IMRT was 38 months (range, 6–184 months), whereas median time to ORN progression to advanced grade after initial diagnosis was 5.6 months (range, 0–128 months). There were statistically significant higher K(trans) and V(e) in ORN-VOIs compared with controls (0.23 vs 0.07 min(−)(1), and 0.34 vs 0.15; P

Forty Wistar rats were used: (1) control group (CG); (2) group of periodontal disease (PD); (3) type 1 diabetes mellitus group (T1DM); (4) type 1 diabetes mellitus + periodontal disease group (T1DM + PD). In groups T1DM and T1DM + PD, T1DM induction was performed with the administration of streptozotocin (STZ) 80 mg/kg intraperitoneal body weight. The PD and T1DM + PD groups were submitted to PD induction with ligation. After the experimental phase and euthanasia, histological, radiographic, and morphological analyses were performed. For data analysis, was used the one-way ANOVA and post-test Tukey. The T1DM + PD group had a significantly higher level of fasting blood glucose compared to the other groups. In radiographic and histomorphometric analyses, the T1DM + PD group showed greater alveolar bone loss compared to the control group. The T1DM + PD group showed greater osteoclastic activity compared to the control, T1DM, and PD groups and exhibited an intense inflammatory infiltrate, most of which were PMN, being that the amount of this group of cells (PMN) was significantly greater than the PD group. The heights of the intestinal villi were statistically higher in the PD, T1DM, T1DM + PD groups, compared to the control. Regarding the height of the crypt, only the T1DM and T1DM + PD groups were significantly higher compared to the other groups. Association of diabetes and periodontal inflammation increased the deleterious effects on bone tissue and adverse effect on the permeability of the duodenal mucosa.

Introduction: The use of three-dimensional models in the diagnosis, planification and treatment of the maxillofacial area pathology has been included in publications since 1980, and has enabled to minimize surgical time, reducing peri and postoperative morbidity, and optimizing surgical results. Currently, the market offers a huge range of 3D printers and materials which allows biomodels to be printed for medical purposes. The purpose of the following paper is to describe the use of two types of three-dimensional models in the therapeutic planning of two cases of mandibular cysts. Case Report: Two cases of mandibular dentigerous cysts are described, in which osteosynthesis plates were used to prevent pathological fractures, pre-modeled together with acrylic positioners on three-dimensional models and printed in different ways. Postoperative clinical and tomographic controls were performed. Conclusion: The knowledge of the properties of the different materials available for the construction of three-dimensional models allows selecting the one that best suits the case needs required, minimizing surgical times and optimizing the results.

Objective: Osteoradionecrosis (ORN) is a severe late complication after radiotherapy but current knowledge on ORN risks in the setting of postoperative radiotherapy (PORT) is limited. We studied the incidence and risk factors of ORN in patients with oral cavity cancers (OCC, treated with PORT.Patients and Methods: A retrospective cohort study was conducted including OCC patients (mainly squamous cell) treated with postoperative intensity modulated radiotherapy between 2010 and 2018 with > 1 year disease-free survival. Cumulative incidences of ORN were computed using the Kaplan Meier method. Clinical and dosimetric risk factors for mandibular ORN were evaluated using Cox regression models.Results: Within our cohort (N = 227, median follow-up 49 months) we observed 46 cases of ORN, mainly in the mandible (n = 41). The cumulative incidence of mandibular ORN was 15.9 % (SE 2.5 %) at three years and 19.8 % (SE 3.0 %) at five years. At univariable analysis, smoking, mandibular mandibulotomy or segment resection, mean dose to the mandible, and mandible volume (%) >= 60 Gy (V60) were significantly associated with increased ORN risks. At multivariable analysis, smoking (HR 2.13, 95 %CI 1.12-4.06) and V60 (HR 1.02 per 1 % increase, 95 %CI 1.01-1.04) remained predictive factors. For active smokers with a high V60 >= 40 % we observed rapid ORN development with a 1-year incidence of 29 % vs 6 % for others (p < 0.01).Conclusion: OCC Patients treated with PORT are at high risk for mandibular ORN. We identified the mandibular volume receiving >= 60 Gy as the dominant risk factor, especially in active smokers. Limiting high-dose volumes at treatment planning may decrease ORN risks.