Search results for "BCT"
showing 10 items of 28 documents
Kemitermomekaanisen massan valkaisu
2017
Tämän pro gradu -tutkielman tarkoituksena oli perehtyä valkaistun kemitermomekaanisen massan (BCTMP) valmistukseen, sen valkaisuun sekä tuotetun massan ominaisuuksiin. Erityisesti työssä käsiteltiin erilaisia valkaisukemikaaleja sekä valkaisutapoja. BCTMP:n valmistuksessa käytetyt kemikaalit ovat avainasemassa massan valmistuksen energiankulutuksessa sekä haluttujen ominaisuuksien saavuttamisessa. Verrattuna kemiallisen massan valmistukseen, mekaanisessa massassa siihen jätettävä ligniini teettää prosessissa haastetta. Puuainekseen jätettynä ligniini takaa massaan korkean saannon, jopa yli 90 %, mutta alentaa sen vaaleutta. Ligniinin värilliset kromoforiset ryhmät pyritään muuntamaan väritt…
Exploring the common blockchain adoption enablers: the case of three Italian wineries
2021
Purpose This study aims to explore and describe the main enabling factors affecting the implementation of blockchain technology (BCT) in a strategic sector such as the wine industry, as well as the motivation behind this choice. Design/methodology/approach In light of the novelty of the phenomenon studied, a case study approach was adopted analyzing three Italian wineries. A conceptual framework, based on the dynamic capabilities, absorptive capacity and dominant logic theories, was developed. Primary and secondary data were collected. Findings Results show that wineries working in a highly dynamic and competitive market invest more in knowledge acquisition and internal assimilation and le…
Changes in dimension of neurovascular canals in the mandible and maxilla: A radiographic finding in patients diagnosed with MRONJ.
2017
Background The aim of this retrospective study was to compare the morphological features of neurovascular canals and foramina of patients with medication-related osteonecrosis of the jaws (MRONJ) and healthy individuals by using cone beam computed tomography (CBCT). Material and Methods The CBCT images of 58 patients under bisphosphonate therapy diagnosed with MRONJ and age gender- matched controls were retrospectively evaluated. The diameter of mandibular and nasopalatine canal and mandibular, mental and lingual foramina were measured on several sections of CBCT. The value of mental index (MI) and panoramic mandibular index (PMI) were also assessed. Results The mean value of diametric meas…
CHANGES IN SCHOOL ANXIETY AND EMOTIONAL SELF-REGULATION OF AN ADOLESCENCE EXPERIMENTAL GROUP FOLLOWING THE ABKT-B PROGRAMME
2020
The purpose of this study was to adapt the experimental programme MBCT-C (Randy J. Semple & Jennifer Lee’s programme “Mindfulness-Based Cognitive Therapy for Anxious Children”, 2011) in early adolescents and compare the changes in school anxiety and emotional regulation indicators before and after in the experimental and control group. The necessity for intervention with respect to school anxiety and emotional regulation among children with emotional regulation and school anxiety issues in the early adolescence group was indicated by research into problems connected with youth behaviour and difficulties in regulating emotions. The study analysed the results of six 6th grade students (12…
Wilson maxillary curve analyzed by cbct a study on normocclusion and malocclusion individuals
2013
The anatomy of dental compensation curve in the frontal plane described by George H. Wilson is one of the occlusal determinants of orthodontic treatment. However, there is few published comparing malocclusion and normocclusion individuals. Objectives: The aim of this study is to compare the curve of Wilson at first and second maxillary molars, normocclusion pattern and malocclusion pattern, with and without bilateral posterior crossbite, using angular references in CBCT studies. Material and Methods: We analyzed 10 cases of malocclusion with bilateral posterior crossbite, 10 cases of malocclusion without bilateral posterior crossbite and 10 cases with non orthodontic normocclusion (patients…
Classification of impacted mandibular third molars on cone-beam CT images
2014
Background: Neurological involvement is a serious complication associated to the surgical removal of impacted mandibular third molars and the radiological investigation is the first mandatory step to assess the risk of a possible post-operative injury to the inferior alveolar nerve (IAN). The aim of this study was to introduce a new radiological classification that could be normally used in clinical practice to assess the relationship between an impacted third molar and mandibular canal on cone beam CT (CBCT) images. Material and Methods: CBCT images of 80 patients (133 mandibular third molars) were independently studied by three members of the surgical team to draw a classification that co…
Effect of antibiotic prophylaxis for preventing infectious complications following impacted mandibular third molar surgery. A randomized controlled t…
2021
Background The objective of this study was to determine the effect of antibiotic prophylaxis in preventing postoperative infections after extraction of impacted mandibular third molars. Material and Methods A Parallel-group, randomized, blind, placebo-controlled trial was performed. 154 patients were randomly allocated to 2 groups; experimental (n=77) receiving 2g amoxicillin 1 hour prior to surgery and control (n=77) receiving placebo. Primary outcome was postoperative infections and secondary outcome was the need for rescue analgesia. Results 4.5% of patients developed postoperative infections, five patients of the control group (4 alveolar osteitis, 1 surgical site infection) and two of …
Immediate three-dimensional changes in the oropharynx after different mandibular advancements in counterclockwise rotation orthognathic planning
2021
Background A retrospective cohort study was performed to evaluate the immediate effect on the oropharynx dimensions from different mandibular advancements in patients undergone counterclockwise rotation (CCW) of the maxillomandibular complex. Material and Methods 138 CBCT images of patients, who had undergone orthognathic surgery, were identified from Dolphin Imaging archive according to pre- (T0) and post-operative (T1) times. Each pre-operative CBCT image was selected considering retrognathic mandible. Superimpositions of CBCT images were performed to measure mandibular advancement at B point in millimeters (mm) and divided into three groups: G1 ( 10 mm). For evaluating oropharynx dimensi…
Relación entre la incidencia de asimetrías mandibulares y la clase esquelética y patrón facial del paciente medida sobre Cone Beam Computed Tomograph…
2019
Introducción: El propósito de este estudio fue establecer si existe una relación entre la presencia de asimetrías mandibulares y la maloclusión esquelética o patrón facial del paciente. Material y métodos: Se realizó un estudio retrospectivo comparativo. Se analizaron imágenes de tomografía computarizada de haz cónico (CBCT) de 60 sujetos del Departamento de Ortodoncia de la Universidad de Valencia (34 mujeres, 26 hombres; edad media, 32,7 ± 11,6 años). Las exploraciones CBCT se dividieron en 3 grupos (pacientes con Clase I, Clase II y Clase III esquelética) y se determinó el patrón facial de cada paciente. Utilizando dos programas informáticos (ITK-SNAP y 3DSlicer), se realizó la segment…
Determination of Cochlear Duct Length With 3D Versus Two-dimensional Methods: A Retrospective Clinical Study of Imaging by Computed Tomography and Co…
2021
BACKGROUND The aim of this study was to compare three different methods for measurement of cochlear duct length (CDL) in the clinical setting for two different imaging modalities, namely computed tomography (CT) and cone-beam computed tomography (CBCT). PATIENTS AND METHODS One hundred temporal bone data sets (CT: n=50; CBCT: n=50) of non-malformed cochleae were retrospectively analyzed using three different CDL estimation techniques: 3D curved multiplanar reconstruction (cMPR), 2D cMPR and the A-value formula. RESULTS The data sets belonged to 60 patients (34 males, 26 females; mean age=50.28±18.58 years). For both imaging modalities, application of the 3D cMPR estimation technique led to …