Improved accuracy of digital implant impressions with newly designed scan bodies: an in vivo evaluation in beagle dogs

Background The accuracy of digital impressions for fully edentulous cases is currently insufficient for routinely clinical application. To overcome the challenge, a modified scan body was introduced, which demonstrated satisfactory accuracy in vitro. The aim of this study was to evaluate the accuracy of digital impressions using the modified scan bodies with extensional structure versus scan bodies without extensional structure in mandible with two implants in beagle dogs. Methods The unilateral mandibular second premolar to second molar were extracted in four beagle dogs. Twelve weeks later, two implants were placed. Five repeated digital impressions were performed with an intraoral scanner on each dog using each of the two different scan bodies: Group I—scan body without extensional structure (SB); Group II—scan body with extensional structure (SBE). The scans were exported to Standard Tessellation Language (STL) files to serve as test data. The dogs were sacrificed and the dissected mandibles were digitalized with a lab scanner to provide reference data. Linear and angular deviations were calculated in an inspection software for accuracy assessment. Statistical analysis was performed with two-way ANOVA. The level of significance was set at α = 0.05. Results For trueness assessment, the mean of absolute linear/angular deviations were 119.53 μm/0.75 degrees in Group I and 68.89 μm/0.36 degrees in Group II. SBE was more accurate than SB regarding both linear (p = 0.008) and angular (p = 0.049) deviations. For precision assessment, the mean of absolute linear/angular deviations were 63.01 μm/0.47 degrees in Group I and 38.38 μm/0.24 degrees in Group II. No significant difference was found. Conclusions The application of SBE significantly improved the trueness of digital impressions in mandible with two implants compared to SB. No significant difference was found in terms of precision.

Extentional Fault Pada Daerah Compressive Tectonic Zone Sebagai Batas Cekungan Di Jawa Tengah Selatan

The extensional structure as a normal fault could be found in many places at the southern part of Java compressive tectonic regime. The research area is in the eastern part of the South Serayu Mountains. This normal fault structure is the boundary of the South Serayu Mountains at the eastern part with Kulon Progo Tertiary volcanic Mountains. In the field, these normal fault lineament zones create the Bogowonto river as a boundary of two different geological styles. The influence of this structure on the geological dynamic of the South Serayu Mountains and the Kulon Progo Mountains is important to be explained. The study was conducted by measuring and analyzing fault data and lithology that developed in the area around the two basins boundary. The distribution of the Kulon Progo volcanic rocks indicates the presence of the extensional fault structure. The volcanic facies distribution of the volcano is cut and becomes narrow in the west, while the northward is very wide. Normal fault striations analysis on the fault plane along the fault line shows the least stress trending west-northwest that has worked to create North-South normal faults. The fault-controlled by stress with the vertical main compression area. They have worked to create North Northeast-South Southwest (NNE-SSW) normal faults with westward dipping.

The transition from Pyrenean shortening to Gulf of Lion rifting in Languedoc (South France) – A tectonic-sedimentation analysis

The Pyrenean orogen extended eastward, across the present-day Gulf of Lion margin. The late or post-orogenic dismantling of this orogen segment, contemporaneous with ongoing shortening in the Spanish Pyrénées, is still debated. Understanding the transition between the two geodynamic events requires to document the precise timing of the succession of the tectonic processes involved. We investigate the superposition of rifting structures over Pyrenean thrusts and folds in the onshore Languedoc. Compilation and reassessment of the regional chronostratigraphy, in the light of recent biostratigraphic dating and new mapping of Paleogene basins, lead to date the transition to the Priabonian. Tectonic-sedimentation relationship in the Eocene to Oligocene depocentres are analysed in surface exposures as well as in seismic reflection surveys. Bed-to bed mapping allowed us to: i) characterise an intermediate sequence of Priabonian age, bounded at the base and the top by unconformities; ii) evidence syn-depositional deformation within the Priabonian; iii) define the axes of Priabonian deformation. Interpretation of seismic reflection profiles, across the onshore basins covered by syn- and post-rift sequences, reveals the existence of an intermediate sequence displaying similar features, and that is correlated to the Priabonian. Syn-depositional deformation of some Priabonian basins correspond to extensional structure, whereas neighbouring, contemporaneous basins, reveal compressional deformation. The distribution of such apparently conflicting observations across the studied area provides evidence for left-lateral strike-slip deformation between two major regional faults (Cévennes and Nîmes faults). Left-lateral strike-slip along NE-trending faults accommodates E-W extension of the West European Rift (ECRIS) and part of the ongoing N-S shortening in the Central and Western Pyrénées. Priabonian clastic sedimentation and deformation in Languedoc witness the initial stages of the dismantling of the Languedoc-Provence Pyrénées, prior to Oligocene-Aquitanian back-arc rifting.

Tort’s Indifference: Conformity, Compliance, and Civil Recourse

Leading accounts of tort law split cleanly into two seams. Some trace its foundations to a deontic form of morality; others to an instrumental, policy-oriented system of efficient loss allocation. An increasingly prominent alternative to both seams, Civil Recourse Theory (CRT) resists this binary by arguing that tort comprises a basic legal category, and that its directives constitute reasons for action with robust normative force. Using the familiar question whether tort’s directives are guidance rules or liability rules as a lens, or prism, this essay shows how considerations of practical reasoning undermine one of CRT’s core commitments. If tort directives exert robust normative force, we must account for its grounds—for where it comes from, and why it obtains. CRT tries to do so by co-opting H.L.A. Hart’s notion of the internal point of view, but this leveraging strategy cannot succeed: while the internal point of view sees legal directives as guides to action, tort law merely demands conformity. To be guided by a directive is to comply with it, not conform to it, so tort’s structure blocks the shortcut to normativity CRT attempts to navigate. Given the fine-grained distinctions the theory makes, and with the connection between its claims and tort’s requirements thus severed, CRT faces a dilemma: it’s either unresponsive to tort’s normative grounds, or it’s inattentive to tort’s extensional structure.

PEMODELAN BAWAH PERMUKAAN MANIFESTASI MINERAL DENGAN METODE GEOMAGNETIK DAERAH PACITAN JAWA TIMUR

Tulakan Subdistrict, Pacitan Regency, East Java Province. This area is part of the Southern Mountain Zone of East Java, which is the Sunda-Banda magmatic arc of Oligo-Miocene age, where there are alterations and indications of valuable ore minerals. Field magnetic data is taken in an area of 1 x 1 km, with the looping method on the grid trajectory within 200 x 100 m. Then, magnetic data correction and data processing were carried out with Oasis Montaj. From the magnetic anomaly map, the value of high magnetic intensity in the southern part is fresh (intrusive) andesit-dasitic rock as host rock which causes alteration, in the middle has a low magnetic intensity value which is in the direction of the relatively NE-SW river direction, whereas in the north with high intensity is fresh andesite lava. From the image data, it can be seen that the straightness pattern of the geological structure which is dominated by the extensional structure with the direction of NE-SW and E-W is the main trap of epithermal veins carrying ore mineralization mainly Cu, Pb in the study area.

POST- ALPINE LATE PLIOCENE – MIDDLE PLEISTOCENE UPLIFTED MARINE SEQUENCES IN ZAKYNTHOS ISLAND

Post-orogenic marine sequences crop out in two areas of Zakynthos Island: a) In Gerakas peninsula at the southeastern edge of the island and b) Along the coastal zone of central northern Zakynthos from Alikanas in the west to Zakynthos town in the east. Detailed stratigraphic analysis of Gerakas area has shown the existence of three formations separated by two unconformities: 1) Gerakas Fm Q1 comprising marls of Late Pliocene–Early Pleistocene age (2.8 – 0.9 Ma). 2) Kalogeras Fm Q2 comprising littoral sandstones at the base (Q2a), alternations of sandstones and marls in the middle (Q2b) and marls (e.g. Porto Roma) in the upper part (Q2c). The age of this formation is middle Pleistocene (0,8 – 0,5 Ma). 3) Agios Nikolaos Fm Q3 comprising littoral sandstones. Stratigraphic correlations between the two aforementioned areas have been made and equivalent stratigraphic formations, slightly differentiated in the central northern Zakynthos, have been identified. The upper unconformity is well pronounced in the area of Cape Gaidaros whereas the lower unconformity is often masked by debris accumulated along the base of the cliffs produced by the compact sandstones of Q2a above the soft marls of the underlying Q1. A remarkable increase in the thickness of the middle member Q2b is observed in the northern part with respect to the equivalent Kalogeras Fm in Gerakas area. In contrast, the thickness of the upper member (Q2c) is highly reduced in the limited northern outcrops compared to those of the southeastern exposure. The Plio-Quaternary post-orogenic marine deposits in both regions represent the creation of the accommodation space formed by the westernmost extensional structure of the Hellenic arc. The two unconformities reflect sea-level changes during the Quaternary within an overall tectonic uplift of Zakynthos Island at the front of the Hellenic arc and trench system, while the entire post-orogenic sequence reflects the intense palaeoclimatic fluctuations of the Quaternary.

Geochemical Characteristics and Genesis of Volcanic Rocks from Zhangjiakou Formation in the Chaoyang Basin, Western Liaoning

The Zhangjiakou Formation of Late Jurassic is mainly distributed in the Chaoyang basin in Western Liaoning. Zhangjiakou volcanic cycle may be divided into three subcycles. The volcanic rocks of Zhangjiakou Formation mainly consist of rhyolites, trachyte and trachyandesites. The volcanic rocks are characterized by high SiO2, Al2O3, K2O and Na2O, and comparatively low MgO and TiO2 components. σ=1.76-4.34, the average value is 2.59. Chemical composition of volcanic rocks indicates that they belong to the high-K calc-alkaline magmatic serious. The volcanic rocks are obviously enriched in incompatible elements (K, Rb, Sr, Zr, Ba, Pb, Li), and depleted in compatible elements (Ti, Co, Ni, Cr, V).The volcanic rocks is rich in LREE. The spider patterns are the right-incline. There is a slight low Eu negative abnormality and low Ce negative abnormality. The geochemistry characteristic shows that volcanic rocks of Zhangjiakou volcanic cycle were formed in the transitional environment of compressional orogeny and extensional structure. They have the basic characteristics of continental intra-plate volcanic rocks. The volcanic rocks were mainly derived from the crust materials. The lithogenesis take partial melting as a major part.