Prevalence and extent of Alveolar dehiscence and fenestration in Class I hyperdivergent subjects with different buccolingual inclinations of maxillary molar teeth: a CBCT study

Buccolingual position of teeth could affect the prevalence of alveolar bone defects. Presence of alveolar defects may have a deleterious effect on orthodontic treatment. The aim was to assess the prevalence and extent of dehiscence and fenestration in Class I hyperdivergent subjects and correlate it with buccolingual inclinations(BL) of maxillary first molar teeth. Methods: This retrospective study involved 80 CBCTs of class I hyperdivergent subjects divided into two groups - group A (n=33) buccolingual inclination >9º and group B (n=47) buccolingual inclination <9º. Prevalence and extent of alveolar bone dehiscence and fenestrations were measured in CBCTs using OSIRIX Lite software. Descriptive statistics, Mann Whitney U test and Spearman correlation were done for evaluating intergroup differences and correlation with Buccolingual inclination. Results: Overall prevalence of dehiscence and fenestration in maxillary first molars was 60.95% and 5% respectively. In the buccal alveolar bone, prevalence of dehiscence was highest in group A (84.6%) for 16 and in the lingual alveolar bone prevalence of dehiscence was highest in group B (71.4%) for 26 . On intergroup comparison, the extent of lingual alveolar bone dehiscence (26) in group B was significantly higher (p value <0.05) than in group A. No significant correlation between the extent of dehiscence and fenestration with buccolingual inclination of molar teeth was noted. Conclusion: Molar teeth with BL inclinations of more than 9º had higher prevalence of dehiscence on the buccal side and molar teeth with BL inclinations less than 9 degrees had more dehiscence on the lingual side. But no significant correlation of BL inclination with prevalence and extent of dehiscence and fenestration was noted

Quality of Life and Maxillary Defects: A Cross-Sectional Study / Calidad de Vida y Defectos Maxilares: Un Estudio Transversal

ABSTRACT: There has been little discussion about the quality of life of patients with maxillary defects. This article evaluates the issues related to the condition. We performed a cross-sectional study of patients with maxillary defects from referral centers in Brazil. To avoid subject burden, a questionnaire was developed, based on questions from seven instruments, which dealt with domains and conclusions that were similar to those from other studies. The predictor variable was the patients' score for each question. The outcome measure was the presence of the best-ranked items on the questionnaire as the impact factor. Six experts assessed these items and suggested which questions to include or exclude. Patients scored each item according to its occurrence and importance. Descriptive statistics and the items' rank according to the impact factor were computed to determine whether there is a comprehensive instrument available. Thirteen patients and six professionals were included in this study. The patients' age ranged from 24 to 72 years (mean (standard deviation, SD), 50.41 (14.46) years). We obtained a 60-item instrument from the selected questionnaires and subject interviews. Only 12 (37.5 %) out of the 32 best-rated items were verified by the existing instruments, two (6.25 %) were suggested by professionals and 18 (56.25 %) were conclusions from other studies. To the best of our knowledge, this is the first study to provide many features related to the quality of life in patients with maxillary defects.

RESUMEN: Existe escasa discusión en la literatura sobre la calidad de vida de los pacientes con defectos maxilares. Este artículo evalúa los problemas relacionados con esta condición. Realizamos un estudio transversal de pacientes con defectos maxilares de centros de referencia en Brasil. Se desarrolló un cuestionario basado en preguntas de siete instrumentos, que trataba sobre dominios y conclusiones similares a las de otros estudios. La variable de estimación fue la puntuación de los pacientes para cada pregunta. La medida de resultado fue la presencia de los elementos mejor clasificados en el cuestionario como factor de impacto. Seis expertos evaluaron estos ítems y sugirieron qué preguntas incluir o excluir. Los pacientes puntuaron cada ítem según su ocurrencia e importancia. Se calcularon las estadísticas descriptivas y la clasificación de los ítems según el factor de impacto, para determinar si existe un instrumento completo. Trece pacientes y seis profesionales fueron incluidos en este estudio. La edad de los pacientes osciló entre 24 y 72 años [media (desviación estándar), 50,41 (14,46) años]. Obtuvimos un instrumento de 60 ítems de los cuestionarios y entrevistas de temas seleccionados. Solo 12 (37,5 %) de los 32 ítems mejor calificados se verificaron de acuerdo a los instrumentos existentes, dos (6,25 %) fueron sugeridos por profesionales y 18 (56,25 %) fueron conclusiones de otros estudios. De acuerdo a nuestro conocimiento, este es el primer estudio que proporciona características relacionadas con la calidad de vida en pacientes con defectos maxilares.

A retrospective analysis of oral and maxillofacial pathology in a pediatric population from Rio de Janeiro-Brazil over a 75-year period.

BACKGROUND: The aim of this study was to analyze the distribution of oral and maxillofacial lesions affecting children and adolescents patients from a single oral pathology laboratory from Rio de Janeiro, Brazil. MATERIAL AND METHODS: Oral and maxillofacial lesions biopsied in patients younger than 19-years were retrieved from the oral pathology files of the Department of Oral Diagnosis and Pathology, School of Dentistry, Federal University of Rio de Janeiro over a 75-year period (1942-2017). The clinical data and the diagnoses of each case were included in a Microsoft Excel® database, being classified into 13 categories according to the etiology. A descriptive analysis of the variables age, gender and final diagnosis was made. RESULTS: From 19.095 lesions diagnosed in this period, 2408 (12.61%) were from patients aged 0 to19 years, with a higher incidence in females in the second decade. Salivary gland pathology was the most common group of lesions (24.30%), followed by reactive lesions (16.82%) and odontogenic cysts (14.66%). Mucocele was the most common lesion (21.72%), followed by dentigerous cyst (6.48%) and fibrous hyperplasia (6.44%). Malignant lesions were observed in 1.12% of all cases with Burkitt lymphoma as the most frequent. CONCLUSIONS: Our results were similar to previous studies and knowledge of these data may contribute to the understanding of oral lesions that most commonly affects children.

A multicenter study of biopsied oral and maxillofacial lesions in a Brazilian pediatric population.

The aim of this study was to investigate the prevalence of oral and maxillofacial lesions among children from representative regions of Brazil. A retrospective descriptive study was conducted. Biopsy records comprising the period from 2000 to 2015 were obtained from the archives of three Brazilian oral pathology referral centers. A total of 32,506 biopsy specimens were analyzed, and specimens from 1,706 children aged 0-12 years were selected. Gender, age, anatomical location and histopathological diagnosis were evaluated. Descriptive statistics was carried out. Likelihood ratio tests were used to evaluate the association between the categorical variables. The level of significance was set at 0.05. The post-hoc test was used to identify the subgroups that significantly differed from one another, and the Bonferroni correction was applied. A total of 1,706 oral and maxillofacial lesions were diagnosed in pediatric patients, including 51.9% girls. Oral mucocele was the most prevalent reactive/inflammatory lesion (64%). The most commonly affected sites were the lips (34.5%) and mandible (19.9%). A significant association was observed between age and the group of lesions of the oral cavity (p < 0.001), and between age and anatomical location (p < 0.001). Pediatric oral and maxillofacial lesions were frequent and showed wide diversity, with the prevalence of mucocele. Knowledge of oral lesions is important for pediatric dentists worldwide, since it provides accurate data for the diagnosis and oral health of children.

Time Trends and Determinants of Fistula in Cleft Patients at BC Children's Hospital, Canada: A Retrospective 18-Year Medical Chart Audit.

OBJECTIVE: To examine the time trends and determinants of palatal fistula in children with different types of cleft at British Columbia's Children's Hospital between 1995 and 2012. METHODS: A total of 558 medical charts of nonsyndromic patients with cleft lip and palate were eligible for the chart review. The occurrence of primary palatal fistula was assessed at any time throughout the patient's total observation period. Three types of clefts were recorded: unilateral cleft lip and palate (ULCLP), bilateral cleft lip and palate (BLCLP), and isolated cleft palate (ICP). Cleft severity, time period of treatment, type of surgery and surgeon's experience were tested as determinants. RESULTS: Of all 558 patients, 228 had ULCLP, 226 had ICP, and 104 had BLCLP. The combined postoperative palatal fistula rate was 28%. The significant differences in fistula rates related to type of cleft (patients with BLCLP had the highest fistula rates), time period (rates were higher in earlier years than in later years), type of surgery (highest rates were for two-flap palatoplasty), and surgeons with less experience. CONCLUSIONS: Almost one quarter of the patients, developed fistula, and fistula incidence declined after 2009. The higher fistula rates were determined by cleft severity, time period of treatment, type of surgery, and surgeon's experience.

Association between oral tori, occlusal force, and mandibular cortical index.

OBJECTIVE: To assess possible associations between torus palatinus (TP), torus mandibularis (TM), occlusal force (OF), Klemetti's classes, mandibular cortical index (MCI), and sociodemographic variables in a selected sample of Jordanians. Previous studies have suggested that oral tori are benign anatomical variations probably related to several factors such as functional stress, gender predisposition, number of teeth present, and nutritional factors. METHOD AND MATERIALS: A total of 130 Jordanian adults were included. Shape, location, and appearance of tori were recorded from study casts. Size was measured using digital calipers. OF was recorded in Newtons. MCI and Klemetti's classification were assessed using panoramic radiographs. Data were statistically analyzed, and level of significance was set at P < .05. RESULTS: The mean ± SD recorded OF was 524 ± 183 N in the tori group, compared to 417 ± 172 N in controls (P = .001). OF was significantly higher in males compared to females (P < .001), and was significantly higher in subjects with TM only (543 ± 201 N) (P < .001). TP and TM were predominantly more than 6 mm in size. The average OF in subjects with Klemetti class 3 was 418 ± 174 N, while OF in Klemetti class 1 subjects amounted to 535 ± 187 N (P = .043). CONCLUSION: Average OF was significantly higher in tori subjects and in males (if compared to controls and female subjects, respectively). The presence of oral tori, Klemetti's classification, and MCI ratio seems to be positively correlated with OF.

Prevalence of odontogenic lesions among the Kanpur population: an institutional study.

BACKGROUND: The frequency and incidence of odontogenic cysts and tumors are controversial and depends in the geographic location. These lesions have great clinical and histopathological diversity, and reflect a need for epidemiological profile to be considered when these lesions are studied. AIM: The purpose of this study was to determine the prevalence of odontogenic cysts and tumors over a period of 10 years and to compare with other data reported around the world. MATERIALS AND METHODS: Data for the study were obtained from the archives of the Department of Oral and Maxillofacial Pathology, diagnosed as the cases of Odontogenic cysts and tumors histopathologically, reported from January 2007 to March 2016. Case records of the patients that fit the histological classification of the World Health Organization (2005) were included in the study and the variables analyzed were: Age, sex, anatomical location, and histological type. RESULTS: In a total of 1319 biopsies reported, 112 were odontogenic in nature. Of these 112 odontogenic lesions reported, Odontogenic Cysts accounted for 54.4% and odontogenic tumors of 45.53%. Of them 61.60% of the patients were males. Common age of occurrence was 21-50 years and mandibular posterior was the most common site of occurrence. Most common odontogenic cyst and tumor reported was dentigerous cyst and ameloblastoma respectively. CONCLUSION: This study provides epidemiological information on odontogenic cyst and tumors at an institutional level. The relative frequency of these cysts and tumors can be analyzed at a global level to understand their prevalence, incidence, biological behaviour, and distribution.

Bi-maxillary dentigerous cyst in a non-syndromic child - review of literature with a case presentation.

Dentigerous cysts are the most common developmental odontogenic cysts of the jaw, which usually occur in the second and third decade of life. It is most frequently associated with impacted mandibular third molar teeth and impacted canines. Bilateral/multiple dentigerous cysts are rare and typically associated with developmental syndromes. Non-syndromic dentigerous cyst occurring bilaterally or involving both arches at the same time is very rare. Here, we discuss the review of literature with a case of unusual occurrence of non-syndromic bi-maxillary dentigerous cysts in a child.

Epidemiology of Oral and Maxillofacial Infections.

Dental caries and periodontal disease are the most common dental infections and are constantly increasing worldwide. Distribution, occurrence of dental caries, gingivitis, periodontitis, odontogenic infections, antibiotic resistance, oral mucosal infections, and microbe-related oral cancer are important to understand the public impact and methods of controlling such disease. Distribution of human papilloma virus and human immunodeficiency virus -related oral cancers in the US population is presented.

Dentigerous Cysts of Maxillofacial Region- Clinical, Radiographic and Biochemical Analysis.

BACKGROUND: Dentigerous cyst is the second most common type of odontogenic cysts that encloses the crown of an unerupted tooth by expansion of its follicle due to the collection of cystic fluid. In view of the capability of these lesions attaining a marked size if not diagnosed early and treated properly, the present study was done based on the clinical and radiographic presentation of the dentigerous cyst in addition to the analysis of the cystic contents. OBJECTIVE: The present study reported 14 cases of dentigerous cysts (DC) with their incidence and relative distribution of the maxillofacial region along with the clinical and radiographic features and biochemical analysis of cystic fluid. METHOD: The study was conducted at Sri Govind Tricentenary Dental College, Hospital and Research Institute, Gurgaon, Haryana for a period of one year and six months. A detailed case history and thorough clinical examination was done for the patients who were provisionally found to have odontogenic cysts. Necessary radiographs, aspiration of the cystic fluid and incisional biopsy were performed to the 14 patients who were provisionally diagnosed with dentigerous cysts (DC) after obtaining the informed consent and the cystic fluid was subjected to biochemical analysis. RESULTS: Majority of the affected patients with DC were in their second decade and showed more predilection for mandible with a male predominance. The area of predilection was third molar region in the mandible and it is the canine region in maxilla. All the cases were associated with impacted teeth and majority showed expansion of the buccal/labial cortical plate. The various biochemical variables (total protein content, albumin, globulin and albumin: globulin ratio) were also assessed in the present study. CONCLUSION: The awareness of protean features of DC evident through this study is essential for the general as well as specialty practitioners for the accurate diagnosis and proper treatment planning of these non cancerous but potentially destructive lesions and also opens new avenues for further research.

The association between septal deviation and the presence of a maxillary accessory ostium.

BACKGROUND: The etiology and the effects of the maxillary accessory ostium (MAO) are not well understood. The aim of this study is to investigate the association between septal deviation (SD) and the presence of an MAO. METHODS: Paranasal computed tomography (CT) scans of 1104 adult patients were studied retrospectively. Patients with chronic sinusitis, acute sinusitis, nasal polyposis, allergic rhinitis, paranasal sinus tumors, septal perforation, and unilateral or bilateral maxillary sinus hypoplasia/aplasia, as well as patients who had previously had nasal surgery or a history of nasal trauma, were not included in the study. Eight-hundred and seven patients were found to meet the criteria and were included in the study. CT scans were examined to note the presence of SD and MAO and the side of both diseases. RESULTS: A total of 807 patients were evaluated. SD and MAO were detected in 572 (70.9%) and 299 (37.1%) patients, respectively. A statistically significant relationship was found between the presence of SD and MAO, regardless of side of the disease (p = 0.002). The side of MAO showed a significant correlation with the direction of SD (p < 0.001). CONCLUSION: Our results revealed a link between SD and MAO. This relationship was correlated with the side of occurrence of the disease.

The 5-year prevalence of maxillofacial fibro-osseous lesions in Uganda.

BACKGROUND: Fibro-osseous lesions of the jaws are a diagnostic challenge for the pathologist because histologically, they are not easily distinguishable. African data on the prevalence of these lesions are scarce. We present a 5-year report of benign fibro-osseous lesions at Mulago Hospital, Uganda, showing the frequency and distribution of these lesions. MATERIALS AND METHODS: Confirmed fibro-osseous lesions reports at the pathology department (2007-2012) were retrieved. Patients' clinical data including age, gender, anatomic location, and diagnosis were recorded. Descriptive statistics and simple proportion tests were carried out. RESULTS: We retrieved 155 confirmed benign fibro-osseous lesions over this period, 65% were females, 34% males, and the gender of one case was not specified. Fibrous dysplasia was the most prevalent lesion (n = 87, 56.1%) followed by ossifying fibroma (n = 50, 32.9%) and osseous dysplasia (n = 17, 10.9%). We neither found craniofacial nor polyostotic fibrous dysplasia. Fibrous dysplasia and ossifying fibroma peaked in the second decade at 40.2% and 40.0%, respectively. Florid osseous dysplasia was commonest in the fifth decade. CONCLUSION: In this study, all the florid osseous dysplasia were seen among females. We need to carry out prospective studies to establish as to why and what kind of women get afflicted by this lesion.

[Prevalence and clinical characteristics of oral bony outgrowth in a Moroccan population]. / Prévalence et caractéristiques cliniques des hypertrophies osseuses buccales dans une population marocaine.

OBJECTIVES: Oral bony outgrowths (OBOs) are localized bony protuberances that arise from the cortical plate. Various types of OBOs have been described, the precise designation of which depends on anatomic location such as torus palatinus, torus mandibularis, buccal exostosis, or palatal exostosis. We had for aim to determine the prevalence and clinical characteristics of OBOs in a Moroccan population. METHODS: This cross-sectional study was conducted between March 15 and June 30, 2011 at the Rabat-Salé teaching hospital dental consultation and treatment center, in Morocco. Three hundred and fifty-three patients (160 female and 193 male patients), 11 to 82 years of age, were examined clinically and radiologically to determine the presence of OBO. RESULTS: Twenty-four patients (6.8%) presented with OBOs. The prevalence for exostosis, torus mandibularis, torus palatinus, and associated OBOs was 3.1%, 2%, 0.8%, and 0.9% respectively. There was a significant difference (P=0,01) between the average age for patients presenting with OBO (43.2±12 years of age) and the average age for patients without any OBO (36.5±16 years of age). The prevalence of OBOs in female patients (7.3%) was higher than in male patients (6.3%) but the difference was not significant (P=0.439). Patients with occlusal parafunctional activity presented with significantly more OBO (P=0.016). DISCUSSION: The reported prevalence of OBO is extremely variable, according to age, gender, and ethnic group. The occurrence of OBO could be triggered by genetic factors associated with environmental factors.

Prevalence of developmental odontogenic cysts in children and adolescents with emphasis on dentigerous cyst and odontogenic keratocyst (keratocystic odontogenic tumor).

OBJECTIVE: To investigate the incidence and prevalence of developmental odontogenic cysts in children and adolescents and compare the features of the two most common types, dentigerous cyst and keratocystic odontogenic tumor (KCOT). STUDY DESIGN: A retrospective review in a series of 369 patients with all histological diagnoses of developmental odontogenic cysts in children (≤12 years) and adolescents (13-18 years) was conducted. RESULTS: Among these, 361 (97.8%) patients were diagnosed as dentigerous cyst (n = 281) and KCOT (n = 80), with the male-to-female ratios of dentigerous cyst and KCOT both being 2:1. The average age of the patients with KCOT was older than that of those with dentigerous cyst (14.7 years vs 11.8 years, p < 0.001). Dentigerous cyst (59.1%) was more common in children, but KCOT (78.8%) was more common in adolescents (p < 0.001). Dentigerous cyst (57.6%) predominantly located on the maxilla, but KCOT (60.3%) predominantly located on the mandible (p = 0.010). CONCLUSIONS: Adolescent patients with lesions located on the mandible would favor KCOT over dentigerous cyst. This study aids in better knowledge of the prevalence of developmental odontogenic cysts in a large pediatric population, and shows that a well-supported early diagnosis is indispensable for a more adequate treatment.

Osteonecrosis of the jaw in Sweden associated with the oral use of bisphosphonate.

PURPOSE: To estimate the incidence of bisphosphonate (BP)-related osteonecrosis of the jaw (BRONJ) associated with the use of oral BPs and osteonecrosis of the jaw (ONJ) not associated with current or previous medication with a BP or radiotherapy to the head and neck region (background ONJ) in Sweden. MATERIALS AND METHODS: A survey was sent to all oral and maxillofacial surgery clinics and hospital dental clinics in Sweden. They were requested to report all new cases of BRONJ and background ONJ during 2007 and 2008. RESULTS: The response rate was 61%. The oral BRONJ incidence for patients aged 45 years or older was 67 cases/100,000 patient-years of BP medication in 2007 (1 case/1,500 patient-years). In 2008, 69 cases/100,000 patient-years (1 case/1,445 patient-years) were reported. The mean age at the development of oral BRONJ was 76.5 ± 10.8 years (median age 79, range 49 to 96) for 2007 and 79.8 ± 7.6 years (median 79, range 67 to 94) for 2008. Women were primarily affected (22 of 26 in 2007 and 25 of 29 in 2008). The incidence of background ONJ was low: 0.14 and 0.09/100,000 person-years for those aged 45 years or older in 2007 and 2008, respectively (3 cases in 2007 and 2 in 2008). CONCLUSIONS: The BRONJ incidence has been estimated to be more than 100-fold greater than the incidence of background ONJ. However, an average Swedish dental practice (1,234 patients) will only encounter 1 patient with new oral BRONJ every 62 nd year.

[Benign odontogenic tumours: epidemiological analysis of 97 cases in the Algerian population]. / Les tumeurs odontogènes bénignes: analyse épidémiologique de 97 cas dans la population algérienne.

INTRODUCTION: Odontogenic tumours are often benign. They are originating from dento-maxillary structures and their embryonic remnants. They represent a wide variety of lesions derived from epithelial cells, mesenchymal, or both. The series reported in literature show a distinct geographic variation. However, there has been no concrete study and detailed epidemiological profile of these tumours in the Algerian population. MATERIALS AND METHODS: Our prospective study based on the classification of the World Health Organization (WHO) in 2005, focused on the epidemiological analysis of 97 cases of odontogenic tumours, collected in the department of maxillofacial surgery of the University Hospital of Constantine. This study was designed to determine the relative frequency of such tumours, their distribution by age and sex, and their histological distribution. RESULT: In our series, women were most affected by the disease (64% of cases) than men (36% of cases). The population was predominantly young with an average age of 29.9 years (range from 12 to 85). The mandible was the site of choice in 74% of cases. Epithelial tumours were diagnosed in 77% of cases; almost half of these cases were ameloblastomas (44% of cases). DISCUSSION: The distribution of odontogenic tumours is different depending on the population studied. The incidence of ameloblastoma is increased in African and Asian population with a female predominance. On the other hand, the odontoma is the most recognized odontogenic tumour in North America and Europe, and more particularly in men.

A prospective epidemiological study for odontogenic and non-odontogenic lesions of the maxilla and mandible in Queensland.

OBJECTIVES: Investigate the epidemiological profile for odontogenic and non-odontogenic intra-osseous lesions in the Queensland population (4.56 million) over 12 months. STUDY DESIGN: The following data were prospectively collected from all Queensland histopathology laboratories in 2011: gender, age at diagnosis, location of lesion, histopathological diagnosis of the lesion and the patient's postcode. RESULTS: Six-hundred and thirty-three lesions were collected, comprising 540 odontogenic cysts and 93 odontogenic tumors. Radicular cyst was the most frequently diagnosed lesion (247/540, 45.7%). The overall incidence of odontogenic tumors was 20.4/million. Keratocystic odontogenic tumor was the highest (15.1/million), followed by ameloblastoma (2.41/million) with odontoma and calcifying cystic odontogenic tumor having the same incidence (1.1/million). The 39 non-odontogenic intra-osseous lesions had an overall incidence of 8.55/million. Nasopalatine cysts had an incidence of 2.19/million, followed by fibrous dysplasia and central giant cell granuloma (1.97/million). CONCLUSIONS: Odontogenic tumors are 5 times less common than cysts. Non-odontogenic lesions are rare, with benign lesions 6.8 times more common than malignant lesions.

A clinicopathological study of 338 dentigerous cysts.

BACKGROUND: Dentigerous cyst (DC) is one of the most common developmental odontogenic cysts. This hospital-based retrospective study evaluated the clinical and histopathological features of 338 DCs in Taiwanese patients. METHODS: In this study, 338 consecutive cases of DCs were collected from January 1995 to December 2009. The demographic data and clinicopathological features of these DC cases were reviewed and analyzed. RESULTS: The 338 DCs were taken from 332 patients (212 men and 120 women, mean age 33.0 years, range 5-83 years). There was a significant difference in the mean age between male and female patients (P < 0.05). Of the 338 DCs, 122 were found in the maxilla and 216 in the mandible. The most common site for DCs was the mandibular molar region (169 cases) and the most frequently involved tooth was the mandibular third molar (153 cases). Forty-six of the 338 DCs were found to be associated with supernumerary teeth. Microscopically, 317 cysts were lined by stratified squamous epithelium, 9 by mucoepidermoid-typed epithelium, and 12 by ciliated pseudostratified columnar epithelium. Hyaline bodies of Rushton, odontogenic epithelial rests, cholesterol clefts, foamy histiocytes, hemosiderin-laden macrophages, and dystrophic calcifications were discovered in 11, 78, 90, 33, 62 and 45 DCs, respectively. CONCLUSION: Our results indicate that DCs of Taiwanese patients have a male predominance and occur more frequently in patients between 10 and 29 years of age. The most commonly affected site for DCs is the mandibular molar region and the most frequently involved tooth is the mandibular third molar.

Benign fibro-osseous lesions of the jaws in children. A 12-year retrospective study.

INTRODUCTION: Fibro-osseous lesions, a diverse group of bone disorders including developmental, reactive or dysplastic diseases and neoplasms, share overlapping clinical, radiographic and histopathologic features and demonstrate a wide range of biological behaviour. AIM: To evaluate the characteristics, treatment and outcome of benign fibro-osseous lesions of the jaws in children. PATIENTS AND METHOD: All patients with fibro-osseous lesions of the jaws treated at the department of Oral and Maxillofacial Surgery of the «A & P Kyriakou¼ Children's Hospital of Athens from 2000 to 2011 were included in this study. Data were retrieved from patients' files and their present situation was registered. RESULTS: Sixteen males and 10 females (mean age 8.5 years) were treated. Fibrous dysplasia was most often encountered (26.9%), and the mandible was the most frequent location (76.9%). All cases were surgically treated and histopathologically confirmed. Marginal ostectomy was performed in 7 cases, partial ostectomy in 4, enucleation and curettage in 10 and trimming-remodelling in 5 cases. Mean follow-up was of 5.5 years with no recurrence, except in one case of fibrous dysplasia. CONCLUSIONS: Fibro-osseous lesions, although sharing similar microscopic features, exhibit a variety of clinical behaviour rendering their treatment highly individualized.