Alveolar preservation with use of bone graft and L-PRF

Las modificaciones y alteraciones dimensionales y biológicas del hueso y los tejidos blandos tras la extracción de una pieza dentaria, en la zona anterior de los maxilares, tienen un impacto significativo en el resultado estético de la futura restauración protética. Aunque los intentos de preservar la cresta alveolar no logren detener el inevitable proceso biológico de remodelado después de una extracción dentaria, estudios de investigación han demostrado que una técnica quirúrgica simple y mínimamente invasiva, el uso de injertos óseos con biomateriales, el uso de membranas de barrera, y la utilización de L-PRF (fibrina rica en plaquetas y leucocitos), obtenido de la sangre autóloga del paciente, son capaces de reducir el grado de los cambios dimensionales, favoreciendo al mantenimiento de un volumen de cresta estable para optimizar los resultados funcionales y estéticos de la restauración protética.The dimensional and biological modifications and alterations of the bone and soft tissues after tooth extraction in the anterior maxillae have a significant impact on the esthetic outcome of the future prosthetic restoration. Although attempts to preserve the alveolar ridge fail to stop the inevitable biological remodeling process after tooth extraction, research studies have shown that a simple, minimally invasive surgical technique, the use of bone grafting with biomaterials, the use of barrier membranes, and the use of L-PRF (platelet- and leukocyterich fibrin), obtained from the patient’s autologous blood, are able to reduce the degree of dimensional changes, favoring the maintenance of a stable ridge volume to optimize the functional and esthetic results of the prosthetic restoration.Fil: Puebla, María Florencia. Hospital Central de Mendoza (Argentina)Fil: Pezzutti, Mariana. Hospital Central de Mendoza (Argentina)Fil: Vega, Cristina. Hospital Central de Mendoza (Argentina)Fil: Palazzolo, Yanina. Hospital Central de Mendoza (Argentina

Learning and Recognizing Archeological Features from LiDAR Data

We present a remote sensing pipeline that processes LiDAR (Light Detection And Ranging) data through machine & deep learning for the application of archeological feature detection on big geo-spatial data platforms such as e.g. IBM PAIRS Geoscope. Today, archeologists get overwhelmed by the task of visually surveying huge amounts of (raw) LiDAR data in order to identify areas of interest for inspection on the ground. We showcase a software system pipeline that results in significant savings in terms of expert productivity while missing only a small fraction of the artifacts. Our work employs artificial neural networks in conjunction with an efficient spatial segmentation procedure based on domain knowledge. Data processing is constraint by a limited amount of training labels and noisy LiDAR signals due to vegetation cover and decay of ancient structures. We aim at identifying geo-spatial areas with archeological artifacts in a supervised fashion allowing the domain expert to flexibly tune parameters based on her needs

Identifying Ancient Settlement Patterns through LiDAR in the Mosquitia Region of Honduras

The Mosquitia ecosystem of Honduras occupies the fulcrum between the American continents and as such constitutes a critical region for understanding past patterns of socio-political development and interaction. Heavy vegetation, rugged topography, and remoteness have limited scientific investigation. This paper presents prehistoric patterns of settlement and landuse for a critical valley within the Mosquitia derived from airborne LiDAR scanning and field investigation. We show that (i) though today the valley is a wilderness it was densely inhabited in the past; (ii) that this population was organized into a three-tiered system composed of 19 settlements dominated by a city; and, (iii) that this occupation was embedded within a human engineered landscape. We also add to a growing body of literature that demonstrates the utility of LiDAR as means for rapid cultural assessments in undocumented regions for analysis and conservation. Our ultimate hope is for our work to promote protections to safeguard the unique and critically endangered Mosquitia ecosystem and other similar areas in need of preservation

Steps of kings: terraced landscapes in the Lake Pátzcuaro Basin, Michoacán, México, The

Department Head: Stephen pages Davies.2010 Summer.Includes bibliographical references (pages 164-179).This thesis uses a landscape approach incorporating landesque capital as statecraft to relate agricultural intensification and state formation theories using data collected from the former island of Apúpato, in the Lake Pátzcuaro Basin, Michoacán, México. Apúpato is located in the geo-political core of the Purépecha Empire, south of Tzintzuntzan, the empire's capital. Apúpato was an important Purépecha island belonging to the Canzonci [Purépecha emperor] and was used as a ritual center, an imperial treasury, and for feasts and expeditions (RM 2008: page) This thesis incorporates recent archaeological investigation, including full coverage settlement pattern survey, geoarchaeology, and remote sensing/ARCGIS, which documented patterns of settlements, confirmed the presence of terraces, and the general landscape development of the former island. This thesis documents and analyzes, for the first time, agricultural terraces in the former island of Apúpato. The most common form of agricultural intensification is terrace agriculture (Donkin 1979) which is linked to the development of social complexity in middle range societies, and states and empires (Fisher et al. 2003). For Mesoamerica, terraces are a fundamental characteristic of ancient social complexity, and continued to be used post-Conquest (A.D. 1520). In the Lake Pátzcuaro basin, agricultural intensification was an important component of state formation in the lake Pátzcuaro basin (Pollard 1993) exemplified by raised field systems and by the construction of terraces to repair Classic period land degradation (A.D 300-800) and to improve productivity of seed crops (Fisher et al 2003; Fisher 2005). This thesis examines the implications of agricultural intensification and state formation in Mesoamerica, using terrace data collected from the former island of Apúpato. The terrace system documented on Apúpato represents a refugia for the Purépecha built environment in the Lake Pátzcuaro Basin, since the Apúpato island setting remained an island for hundreds of years, helping keep Apúpato protected and isolated from the consequences of the European conquest. The terraces documented in the former island of Apúpato are analyzed in terms of their form, function, and construction development for the first time in the Lake Pátzcuaro Basin

A Typology of Ancient Purépecha (Tarascan) Architecture from Angamuco, Michoacán, Mexico

The morphological study of architectural features, the building arrangement within urban spaces, and multiscalar variation are critical for understanding urbanism as a process. Building types and architectural typologies form the foundational blocks of urban morphology and are essential for identifying architectural patterning. We use a process-typological approach to present an architectural typology from the ancient Purépecha (Tarascan) city of Angamuco, located in the Lake Pátzcuaro Basin, Michoacán, Mexico. Using archaeological survey, lidar analysis, and excavation, we analyze building foundations from houses and public structures; storage facilities; monumental architecture such as pyramids, altars, and public buildings; and landscape features such as plazas, roads, terraces, and raised roadways locally known as huatziri. Our typology enhances understanding of the dense urban environment of this important prehispanic city during and after the formation of the Purépecha Empire

Histogram of the near distance from a high order stream segment to the center of a Forteleza settlement.

<p>Calculated using the near function in ESRI ARCGIS couple with a stream order analysis.</p

Eastern most section (A) of site 955 (<i>la Ciudad del Jaguar)</i> within the V<i>alle de la Fortaleza</i> (T1).

<p>Location of section at the site and a legend are shown in <a href="http://www.plosone.org/article/info:doi/10.1371/journal.pone.0159890#pone.0159890.g006" target="_blank">Fig 6</a>. Digitized features are shown over a composite hillshade view taken from 16 different angles draped on a color shaded DSM with a resolution of 1 m/pixel. Contour interval is 25 cm. All visualizations created using high resolution aerial LiDAR.</p

The main portion of site 328.

<p>Digitized features are shown over a composite hillshade view taken from 16 different angles draped on a color shaded DSM with a resolution of 1 m/pixel. Contour interval is 25 cm. All visualizations created using high resolution aerial LiDAR.</p

Core site areas in ha for the 19 settlements identified in the Valle de la Fortaleza.

<p>A) line plot of all sites showing size in ha; B) Histogram of site sizes.</p