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ridge expansion

Firas A Jamil, Sahar Shakir Al-Adili
Many treatment modalities have been introduced for correction of deficient alveolar ridge width. Bone expansion through the ridge split procedure is one of them. This technique was initiated in order to overcome many problems that usually associated with grafting procedures. The present study evaluated the effectiveness of piezoelectric device in performing ridge split using single-stage approach and assessed the outcomes during a period of about 4 months after surgery. A total of 23 patients ages in range between 18 and 60 years underwent ridge split procedure with immediate insertion of dental implants...
October 14, 2016: Journal of Craniofacial Surgery
Alberto Fernandez Ayora, Oscar González-Martín, Eric Rompen, Geoffrey Lecloux, France Lambert
The primary objective of this pilot study was to evaluate a new socket preservation technique involving the intentional expansion of the extraction socket buccal plate using a flapless internal corticotomy and biomaterials. A total of 11 patients requiring tooth extraction were enrolled in this study. The aim of this technique was to maintain or improve the hard and soft tissue contour of the ridge after tooth extraction. All surgical sites healed uneventfully. Significant alveolar bone dimension changes were observed in the coronal region of the ridge (-1...
November 2016: International Journal of Periodontics & Restorative Dentistry
Sabine Gollner, Heiko Stuckas, Terue C Kihara, Stefan Laurent, Sahar Kodami, Pedro Martinez Arbizu
Communities in spatially fragmented deep-sea hydrothermal vents rich in polymetallic sulfides could soon face major disturbance events due to deep-sea mineral mining, such that unraveling patterns of gene flow between hydrothermal vent populations will be an important step in the development of conservation policies. Indeed, the time required by deep-sea populations to recover following habitat perturbations depends both on the direction of gene flow and the number of migrants available for re-colonization after disturbance...
2016: PloS One
Lorenzo Alibardi
Feathers are corneous microramifications of variable complexity derived from the morphogenesis of barb ridges. Histological and ultrastructural analyses on developing and regenerating feathers clarify the three-dimensional organization of cells in barb ridges. Feather cells derive from folds of the embryonic epithelium of feather germs from which barb/barbule cells and supportive cells organize in a branching structure. The following degeneration of supportive cells allows the separation of barbule cells which are made of corneous beta-proteins and of lower amounts of intermediate filament (IF)(alpha) keratins, histidine-rich proteins, and corneous proteins of the epidermal differentiation complex...
September 10, 2016: Protoplasma
Saad Al-Almaie
This clinical case describes the effect of the osteotome technique on the osseointegration of a mandibular dental implant in a 42-year-old female patient with dento-alveolar bony defects and to review the literature regarding immediate implant placement using osteotome technique. The amount of bone expansion at the alveolar ridge and the marginal bone resorption from the time of implant placement to one year after the implant's functional loading were recorded clinically. The esthetic outcome for the restored implant (the gingival margin) was achieved one years after the implant's functional loading...
2016: Open Dentistry Journal
Pushkar Gadre, Divya Singh, Kiran Gadre, Imran Khan
Osteoid osteoma, a rare benign osteoblastic tumor first described by Jaffe in 1935, is characterized as a small but painful lesion that mostly affects younger people. Usually benign and harmless, osteomas are removed for pain or esthetic reasons.Piezoelectric surgery is also increasingly being used effectively in major and minor osseous oral and maxillofacial surgeries, in delicate areas. It is used regularly for various procedures, including sinus lift procedures, bone graft harvesting, osteogenic distraction, ridge expansion, inferior alveolar nerve decompression and lateralization, cyst removal, dental extraction, and impacted tooth removal...
October 2016: Journal of Craniofacial Surgery
Janosch Sedlacek, Andrés J Cortés, Julia Wheeler, Oliver Bossdorf, Guenter Hoch, Jaroslav Klápště, Christian Lexer, Christian Rixen, Sonja Wipf, Sophie Karrenberg, Mark van Kleunen
Alpine ecosystems are seriously threatened by climate change. One of the key mechanisms by which plants can adapt to changing environmental conditions is through evolutionary change. However, we still know little about the evolutionary potential in wild populations of long-lived alpine plants. Here, we investigated heritabilities of phenological traits, leaf size, and performance traits in natural populations of the long-lived alpine dwarf shrub Salix herbacea using relatedness estimates inferred from SSR (Simple Sequence Repeat) markers...
June 2016: Ecology and Evolution
Ulrike Hoff, Tine L Rasmussen, Ruediger Stein, Mohamed M Ezat, Kirsten Fahl
In the light of rapidly diminishing sea ice cover in the Arctic during the present atmospheric warming, it is imperative to study the distribution of sea ice in the past in relation to rapid climate change. Here we focus on glacial millennial-scale climatic events (Dansgaard/Oeschger events) using the sea ice proxy IP25 in combination with phytoplankton proxy data and quantification of diatom species in a record from the southeast Norwegian Sea. We demonstrate that expansion and retreat of sea ice varies consistently in pace with the rapid climate changes 90 kyr ago to present...
2016: Nature Communications
Wouter Masselink, Nicholas J Cole, Fruzsina Fenyes, Silke Berger, Carmen Sonntag, Alasdair Wood, Phong D Nguyen, Naomi Cohen, Franziska Knopf, Gilbert Weidinger, Thomas E Hall, Peter D Currie
The transition from fins to limbs was an important terrestrial adaptation, but how this crucial evolutionary shift arose developmentally is unknown. Current models focus on the distinct roles of the apical ectodermal ridge (AER) and the signaling molecules that it secretes during limb and fin outgrowth. In contrast to the limb AER, the AER of the fin rapidly transitions into the apical fold and in the process shuts off AER-derived signals that stimulate proliferation of the precursors of the appendicular skeleton...
July 28, 2016: Nature
Moustafa Abdou ELsyad, Nelly Ibrahim Hammouda
PURPOSE: The aim of this study was to evaluate and compare the clinical and radiographic outcomes of two implants placed in expanded mandibular knife-edge ridge and implants placed in unexpanded ridges to retain overdentures. MATERIALS AND METHODS: Fifteen completely edentulous patients with knife-edge ridges at canine areas of the mandible received two implants using the ridge expansion technique (study group, SG). Expansion was performed using piezoelectric corticotomy, and self-threading expanders...
June 28, 2016: Clinical Implant Dentistry and related Research
Teresa J Feo, Emma Simon, Richard O Prum
Feathers exhibit an extraordinary diversity of shapes, which are used by birds to accomplish a diverse set of functions. Pennaceous feathers have a double branched morphology that develops from a tube of epidermis, and variation in branch geometry determines feather shape. Feather development is both complex (i.e., a simple developmental modification can have multiple effects on mature feather shape), and redundant (i.e., different developmental modifications can create the same shape). Due to this, it is not readily apparent how different feather shapes develop...
August 2016: Journal of Morphology
Vinh Giap Nguyen, Nadine von Krockow, Paul Weigl, Rita Depprich
PURPOSE: The purpose of this study was to evaluate the efficacy of the ridge-splitting technique in the anterior maxilla, using piezoelectric surgery for immediate implant placement. Study outcomes were compared with those of implant placement in the same patients using the conventional drilling technique. MATERIALS AND METHODS: Ten patients received a total of 22 implants in the anterior maxilla, 11 of which were placed using a ridge-splitting procedure (test group) and the other 11 using the conventional drilling procedure (control group)...
May 2016: International Journal of Oral & Maxillofacial Implants
Gianfranco Mestas, Marco Alarcón, Leandro Chambrone
PURPOSE: To evaluate the survival rates of titanium dental implants placed using split crest procedures for alveolar ridge expansion. MATERIALS AND METHODS: The MEDLINE, CENTRAL, and OpenGrey databases were searched up to January 2015 for studies assessing implants that had been placed in areas submitted to split crest procedures. Two methodologic quality-assessment tools were used based on the type of study. For randomized controlled trials (RCTs), the Cochrane Collaboration tool was used to assess the risk of bias...
May 2016: International Journal of Oral & Maxillofacial Implants
Alberto Robador, Douglas E LaRowe, Sean P Jungbluth, Huei-Ting Lin, Michael S Rappé, Kenneth H Nealson, Jan P Amend
Although fluids within the upper oceanic basaltic crust harbor a substantial fraction of the total prokaryotic cells on Earth, the energy needs of this microbial population are unknown. In this study, a nanocalorimeter (sensitivity down to 1.2 nW ml(-1)) was used to measure the enthalpy of microbially catalyzed reactions as a function of temperature in samples from two distinct crustal fluid aquifers. Microorganisms in unamended, warm (63°C) and geochemically altered anoxic fluids taken from 292 meters sub-basement (msb) near the Juan de Fuca Ridge produced 267...
2016: Frontiers in Microbiology
Daniel L Swain, Daniel E Horton, Deepti Singh, Noah S Diffenbaugh
Recent evidence suggests that changes in atmospheric circulation have altered the probability of extreme climate events in the Northern Hemisphere. We investigate northeastern Pacific atmospheric circulation patterns that have historically (1949-2015) been associated with cool-season (October-May) precipitation and temperature extremes in California. We identify changes in occurrence of atmospheric circulation patterns by measuring the similarity of the cool-season atmospheric configuration that occurred in each year of the 1949-2015 period with the configuration that occurred during each of the five driest, wettest, warmest, and coolest years...
April 2016: Science Advances
Tara M Michels-Clark, Andrei T Savici, Vickie E Lynch, Xiaoping Wang, Christina M Hoffmann
Evidence is mounting that potentially exploitable properties of technologically and chemically interesting crystalline materials are often attributable to local structure effects, which can be observed as modulated diffuse scattering (mDS) next to Bragg diffraction (BD). BD forms a regular sparse grid of intense discrete points in reciprocal space. Traditionally, the intensity of each Bragg peak is extracted by integration of each individual reflection first, followed by application of the required corrections...
April 1, 2016: Journal of Applied Crystallography
Jinfu Liao, Zhiyuan Ling, Yi Li, Xing Hu
Ridges and depressions were formed on the barrier layer during chemical and physical etching of porous anodic alumina (PAA) from the bottom side, indicating nonuniform etching rate around each cell. These behaviors cannot be explained solely by the well-known composition variation, but were in line with the hexagonal distribution of stress within the barrier layer of each cell. Such stress variation should be attributed to the interactions of neighboring cells undergoing volume expansion. These interactions could account for the self-organization of PAA...
March 2016: ACS Applied Materials & Interfaces
C N Roterman, J T Copley, K T Linse, P A Tyler, A D Rogers
We report the first comparative population genetics study for vent fauna in the Southern Ocean using cytochrome C oxidase I and microsatellite markers. Three species are examined: the kiwaid squat lobster, Kiwa tyleri, the peltospirid gastropod, Gigantopelta chessoia, and a lepetodrilid limpet, Lepetodrilus sp., collected from vent fields 440 km apart on the East Scotia Ridge (ESR) and from the Kemp Caldera on the South Sandwich Island Arc, ~95 km eastwards. We report no differentiation for all species across the ESR, consistent with panmixia or recent range expansions...
March 2016: Molecular Ecology
Nikolaos Katsoulas, Nikolaos Nikitakis, Nadia Theologie-Lygidakis, Violetta Lianou, Konstantinos Tsiklakis, Ioannis Iatrou, Alexandra Sklavounou-Andrikopoulou
Tufted angioma is an uncommon benign vascular tumor usually presenting in early childhood and affecting mainly the skin. It has been associated with Kasabach-Merritt syndrome, a severe coagulopathy of poor prognosis. There have been very few published cases of oral tufted angiomas, and maxillary bone involvement has not been hitherto reported. We present a case of a 10-year-old Caucasian boy with an erythematous left maxillary gingival mass accompanied by subjacent hard tissue swelling. Radiologic evaluation revealed an irregular mixed radiolucent and radiopaque area in the left maxilla, accompanied by alveolar ridge erosion, cortical plate expansion, and displacement and divergence of the premolars...
September 2016: Oral Surgery, Oral Medicine, Oral Pathology and Oral Radiology
Antonio Cortese, Giuseppe Pantaleo, Massimo Amato, Pier Paolo Claudio
Various treatment strategies and techniques have been proposed to perform alveolar bone augmentation; most common are guided bone regeneration, split crest, and autologous bone grafting. All of these techniques are reported to possess bone regenerative properties of osteoinduction and osteoconduction in relation to regenerated bone survival. Split crest resulted to be one of the most reliable bone augmentation techniques. In this study, we describe a new flapless-modified split crest technique on 4 patients to optimize the bone regeneration with bone augmentation implant insertion in 1 single stage...
March 2016: Journal of Craniofacial Surgery
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