The interaction of fluvial, tidal, and wave processes in coastal and paralic environments gives rise to sedimentary successions with highly varied styles of facies architecture; these are determined by the morphology and evolutionary behavior of the range of coastal sub-environments, which may be difficult to diagnose in subsurface sedimentary successions with limited well control. This study presents depositional models to account for stratigraphic complexity in a subsurface fluvial to shallow-marine succession, the Middle Jurassic Dhruma Formation, Saudi Arabia. The study achieves the following: i) it examines and demonstrates sedimentary relationships between various fluvial, nearshore, and shallow-marine deposits, ii) it develops depositional models to account for the stratigraphic complexity inherent in fluvial to shallow-marine successions, and iii) it documents the sedimentology and the stratigraphic evolutionary patterns of the lower Dhruma Formation in the studied area of Saudi Arabia. The dataset comprises facies descriptions of 570 m of core from 14 wells, 77 representative core thin sections, 14 gamma-ray logs, and FMI image logs from 4 wells. These data are integrated with quantitative information from > 50 analogous systems from a wide range of modern and ancient settings, stored in a relational database. Stratigraphic correlations reveal the internal anatomy of the succession. Facies associations are representative of fluvial channels, intertidal flats, pedogenically modified supratidal flats or floodplains, river-influenced tidal bars, weakly storm-affected shoreface and offshore-transition zones, storm-dominated delta-front and prodelta settings, and an open-marine carbonate-dominated shelf. These sub-environments interacted in a complex way through space and time. The vertical succession of the studied interval records an overall transition from coastal-plain deposits at the base to marine deposits at the top. As such, the succession records a long-term transgressive, deepening-upward trend. However, this general trend is punctuated by repeated progradational events whereby coastal sand bodies of fluvial, wave, and tidal origin prograded basinward during stillstands to fill bays along a coastline. The nature of juxtaposition of neighboring sub-environments has resulted in a sedimentary record that is highly complex compared to that generated by morphologically simple shoreface systems that accumulate more regularly ordered stratal packages.
Background: There are several elements to consider when determining the optimal procedure for restoring teeth that have undergone endodontic treatment, including the choice and requirement of a post, the kind of coronal restoration, how much coronal structure is still there, and the kind of cementing agent. The ideal restoration procedure for teeth that have undergone endodontic treatment is yet unknown. The goal of this systematic review was to evaluate the restorative material choices and factors that affect the decision-making on endodontically treated teeth (ETT) among dental professionals and students in the Kingdom of Saudi Arabia. Methods: Studies that evaluated the choice or preference of dental professionals for restorative materials for teeth that had undergone endodontic treatment were chosen from surveys that were published between 2012 and 2022 in English. Selected keyword searches were conducted in the Science Direct, PubMed, and Google Scholar databases. The data (theme-related questions and response rates for each survey question) were extracted using a standardized outline, and the likelihood of bias was evaluated. The information gathered was subjected to descriptive analysis. Results: There were 11 articles in total, encompassing 2192 respondents. The response rates ranged from 30% to 98%. The study population consisted of general dental practitioners (n = 1018), followed by dental students (n = 598), specialists (n = 475), and 101 dental surgeons. The years of experience range from 1 to > 30 years, with the majority claiming to have fewer than 10 years. Moreover, 55% of the studies preferred prefabricated posts, such as fiber posts following metal posts. Most of the respondents preferred resin-based cementing agents (22% to 82%). Over 60% of respondents chose composite resin over amalgam as the material for the core foundation Conclusion: The study results from Saudi Arabian data showed that dentists favored using prefabricated posts, such as fiber and metal-based posts, to restore ETTs and resin-based cementing agents. The preferred material for the core foundation built for ETT by regular dentists, specialists, and students is regarded as composite. The amount of coronal tooth structure that is still present is crucial when choosing the post type and restorative material.
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