Evaluation of the Flexural Strength of Submicron Hybrid Composite using Different Fabrication Methods: An in vitro Study.

AIM: The aim of this study is to perform three-point bend test on submicron hybrid composite fabricated with direct and indirect veneer technique. MATERIALS AND METHODS: A total of 20 maxillary anterior teeth were selected, and labial reduction of 0.5 to 0.75 mm with a chamfered finish line for veneer preparation was done. Teeth were divided into two groups depending on fabrication technique being used: group I-veneers fabricated with light and group II-veneers fabricated with light and heat (PHOTOPOL). Specimens were tested under universal testing machine (UTM) where load was applied at a crosshead speed of 1 mm/min with a pointer of 1 mm diameter. Data were statistically analyzed. RESULTS: The results showed highly significant difference between the two groups with the mean value of group I (246.7 ± 2.285 N) and group II (531.1 ± 4.411 N). CONCLUSION: The curing mechanism involving light and heat increases the fracture resistance of the veneers. CLINICAL SIGNIFICANCE: Within the limitations of this study, the results led to the conclusion that the association of common composites with a simple postcure heat treatment may be an alternative for current indirect composite systems, although more studies are needed to assess other properties of the composites for this application.

Epidemiological and Clinicopathological Analysis of 92 Odontogenic Tumors: A 5-year Retrospective Study.

INTRODUCTION: Odontogenic tumors (OTs) are a heterogeneous group of lesions that are derived from odontogenic apparatus comprised of odontogenic epithelium, ectomesenchyme, and/ or mesenchymal elements. The OTs show marked geographical variation. This study was conducted to analyze the epidemiology and clinicopathological presentation of OTs based on age, sex, and site. MATERIALS AND METHODS: This study was conducted in Department of Oral Pathology and Microbiology. Records were reviewed retrospectively for all the lesions of oral cavity from January 2010 to December 2015. A total of 92 lesions were found to be OTs and were classified into benign and malignant tumors. They were further subdivided into three subtypes based on the types of odontogenic tissues involved. These were epithelial OTs (EOTs), mixed OTs (MIXOTs), and mesenchymal OTs (MOTs). RESULTS: Of 92 OTs, 84 were benign (males 48, females 36) and 8 were malignant (male 2, females 6). The most common benign tumor was ameloblastoma (AME) (20), followed by keratocystic OT (KCOT) (17), calcifying EOT (CEOT) (14), compound odontome (OD-Cd) (12), complex odontome (OD-Cx) (10), odontogenic fibroma (OF) (5), odontogenic myxoma (OM) (4), and cementoblastoma (CB) (2). The most common malignant tumor was primary intraosseous squamous cell carcinoma (PIOSCC) (3) followed by fibrosarcoma (FS) (3) and ameloblastic carcinoma (AC). CONCLUSION: Author concluded that there was geographic and demographic variation in distribution of OTs, which may be attributed to socioeconomic and genetic factors. CLINICAL SIGNIFICANCE: Literature showing prevalence of OTs in India is negligible. By this article, we have analyzed the frequency of various OTs according to sex, age, and site. A comprehensive record of OTs should be started so that pathologists and surgeons would be able to acquire the information about the tumor for reference in the future.