Background: One of the key factors in successful endodontic therapy is to adequately fill the root canals. Vertical condensation technique is regarded as a high probability of three-dimensional filling of root canal space which is required to achieve long-term success. Aim: To evaluate the endodontic treatment outcomes of vertical condensation technique using Touch’N Heat device. Subjects and methods: A prospective, descriptive study was conducted across two hospitals in Hue city from 11/2016 to 5/2017. All teeth were instrumented by manual Protaper files and obturated by the vertical condensation technique with Touch’N Heat device. The radiographic evaluation for initial assessment of obturation quality was performed. Evaluation of endodontic treatment outcomes in terms of clinical symptoms and radiographic assessment were recorded after 3-month follow-up. Results: A sample of 30 patients (with 39 incisors) from 13 to 73 years old was recruited. The principal reasons for visiting were pain (30.8%), decay (20.5%) or trauma (20.5%). Most patients seeked treatment at chronic stage of diseases with chronic pulpitis (38.4%) and chronic periapical periodontitis (30.8%). In radiographical quality of obturation, there were 27 (69.3%) fulllength obturated teeth, 8 (20.5%) overfilled teeth (sealer). The percentage of homogeneity of root canal filling was 82.1%. Over 82% patients (25 patients with 32 teeth) presented after there-months followup. Clinical assessment yeiled 30 (93.7%) “adequate” teeth, 2 (6.3%) “poor” teeth. Refer to radiographical assessment, the teeth were defined as “success”, “questionable” and “failure” (29 teeth (90.6%), 3 teeth (9.4%) and zero, respectively). Conclusions: The vertical condensation using Touch’N Heat device ensure the full-length obturation, high homogenetious root canal filling, and sucessful prognosis in clinical and radiographic outcomes. Key words: vertical condensation,Touch’N Heat, endodontic outcomes
Malocclusion is a common dental health problem and can affect the health and life of people. The assessment of malocclusion helps to determine the need for orthodontic treatment according to the two components of dental health and dental aesthetics, which is very important to help improve the effectiveness of intervention and prevention methods necessary. Objectives: To determine the prevalence of malocclusion of primary school students, to determine the need for orthodontic treatment of primary school students according to the index of needs for orthodontic treatment, and the relationship with malocclusion. Method: A crosssectional descriptive study on 220 primary school students aged 7 - 9 at two primary schools in Thua Thien Hue province from June 2021 to September 2021. Conduct oral examination, collect information, measure, observe and record indicators of malocclusion and orthodontic needs. Results: The results of the study on 220 students showed that the ratio of molars in the Angle I direction was the highest, accounting for 45%, and malocclusion was quited high (79.09%). Regarding the need for orthodontic treatment, according to DHCIOTN, 39.55% had little treatment and according to AC-IOTN, 36.6% had moderate treatment. There is a strong correlation between malocclusion status and DHC-IOTN (r=0.65, p>0.05), malocclusion and AC-IOTN have an average correlation (r=0.44, p>0.05). There is also a strong correlation between AC-IOTN and DHC-IOTN (r=0.60, p>0.05). There was no gender difference between treatment levels for dental health and dental aesthetics with p>0.05. Conclusions: malocclusion in 7-9 years old students is quited high - the need for orthodontic treatment according to both dental health components, and aesthetics dentistry. It is necessary to provide timely and effective interventions to improve the oral health of children Key words: Malocclusion, IOTN, need for orthodontic treatment, children.
Preparation of spinel Mn-doped Fe(Al 1−x Mn x ) 2 O 4 (0 ≤ x ≤ 0.9) ferrite powders, in which B-site Al 3+ were replaced partially by Mn 3+ , has been tried via a modified citric acid route. Fe and Al nitrate salts and fine MnO 2 powder were used as starting materials. Homogeneous mixed solutions containing Fe 3+ , Al 3+ ions and MnO 2 were added to the mixed solution of citrate acid (CA) and ethylene glycol (EG) at room temperature with stirring. After boiling and continuous drying, thus obtained precursors were heated in air to burn out the organic substances and calcined at 1173 K (900°C) for 7.2 × 10 3 s (2 h) under nitrogen atmosphere with a small amount of hydrogen to control the valances of Fe and Mn in the ferrite powders. Single spinel B-site Mn-doped Fe(Al 1−x Mn x ) 2 O 4 powders with the compositions of x = 0.0, 0.2, and 0.6 ~ 0.9 have been obtained. With increasing x value, the magnetic property of spinel powder changed from paramagnetism (x = 0) to ferrimagnetism (x = 0.2, 0.6 ~ 0.9) at room temperature. Neutron-diffraction analysis measured at room temperature proved that some of Mn ions occupied B-site and on the contrary Fe did A-site. Magnetic properties also supported this configuration determined by XRD and NRD.
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