Log in

Relevant bibliographies by topics / Crown / Journal articles

To see the other types of publications on this topic, follow the link: Crown.

Journal articles on the topic 'Crown'

Author: Grafiati

Published: 4 June 2021

Last updated: 25 July 2025

Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles

Select a source type:

Consult the top 50 journal articles for your research on the topic 'Crown.'

Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.

You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.

Browse journal articles on a wide variety of disciplines and organise your bibliography correctly.

1

Tahar, K. N., M. A. Asmadin, S. A. H. Sulaiman, N. Khalid, A. N. Idris, and M. H. Razali. "Individual Tree Crown Detection Using UAV Orthomosaic." Engineering, Technology & Applied Science Research 11, no. 2 (2021): 7047–53. http://dx.doi.org/10.48084/etasr.4093.

Full text

Abstract:

Unmanned Aerial Vehicles (UAVs) are increasingly used in forestry as they are economical and flexible. This study aims to present the advantages of the drone photogrammetry method in collecting individual tree crowns, as individual tree crown detection could deliver essential ecological and economic information. The referred accuracy for individual tree crown extraction is 79.2%. Only crowns that were clearly visible were selected and manually delineated on the image because the distribution of the true crown size is significantly different from the segmented crowns. The aim of this study is t

APA, Harvard, Vancouver, ISO, and other styles

2

Mashyakhy, Mohammed, and Hafiz Ahmed Adawi. "Fracture Resistance and Initial Penetration Time of a Novel Zirconia Crown Design for Simplifying Future Endodontic Treatment: An In Vitro Study." Dentistry Journal 12, no. 12 (2024): 385. http://dx.doi.org/10.3390/dj12120385.

Full text

Abstract:

Objectives: This study aimed to investigate the fracture strength of a novel-designed Zirconia crown before and after access opening, and to evaluate the mode of fracture and the time needed for initial penetration through the crown. Methods: This study involved the design and testing of 60 zirconia crowns, divided into three groups (20 crowns each) to compare different structural designs. Group 1 (Control) used a conventional full zirconia crown. Group 2 (Novel Design) featured a zirconia crown with an impermeable ceramic-filled opening. Group 3 (Modified Novel Design) included a zirconia cro

APA, Harvard, Vancouver, ISO, and other styles

3

Yoshimura, Kenichi. "Spatial distribution and morphology of shoots in the variant crown form of Rhododendron reticulatum." Botany 88, no. 11 (2010): 995–1005. http://dx.doi.org/10.1139/b10-071.

Full text

Abstract:

Rhododendron reticulatum D. Don ex G.Don is a common understory shrub in western Japan that exhibits highly plastic crown architecture and occurs in various light environments. I investigated how functional differentiation and spatial distribution of long and short shoots contribute to the plasticity of crown architecture of R. reticulatum. Crown form was derived from the crown depth/width ratio. Crown depth/width ratio was higher in sun-lit crowns. In crowns with higher depth/width ratio, long shoots were distributed in upper positions of the crown. Long shoots grew vertically and horizontall

APA, Harvard, Vancouver, ISO, and other styles

4

Mao, Hua, John B. Thorne, Jennifer S. Pharr, and Robert E. Gawley. "Effect of crown ether ring size on binding and fluorescence response to saxitoxin in anthracylmethyl monoazacrown ether chemosensors." Canadian Journal of Chemistry 84, no. 10 (2006): 1273–79. http://dx.doi.org/10.1139/v06-093.

Full text

Abstract:

Convenient macrocyclization synthetic routes for the preparation of different-sized monoaza anthracylmethyl crown ether chemosensors (15-crown-5, 18-crown-6, 21-crown-7, 24-crown-8, and 27-crown-9) are described. Evaluation of these crowns as chemosensors for saxitoxin revealed that the larger crowns have moderately higher binding constants, with the 27-crown-9 chemosensor having the largest binding constant (2.29 × 105 (mol/L)–1). Fluorescence enhancements of 100% were observed at saxitoxin concentrations of 5 µmol/L, which is close to the detection limit in mouse bioassay.Key words: anthrace

APA, Harvard, Vancouver, ISO, and other styles

5

Bamdadian, Zhaleh, Nilgoon Pasdar, Abdolhamid Alhavaz, Shahram Ghasemi, and Ali Bijani. "Comparative Evaluation of Physical and Mechanical Properties of Different Brands of Primary Molar Stainless-Steel Crowns: An In Vitro Study." Open Access Macedonian Journal of Medical Sciences 7, no. 23 (2019): 4120–26. http://dx.doi.org/10.3889/oamjms.2019.861.

Full text

Abstract:

BACKGROUND: There is some cases of perforation and undesirable properties of some primary molars stainless steel crowns. AIM: The aim of this study was to compare the physical and mechanical properties of different commercial brands of these crowns. METHODS: In an in vitro study, a total of 10 stainless steel tooth crowns of the second primary mandibular molars size 6 of 4 different commercial brands (a total of 280 crowns) were evaluated. These crowns were included KTR Pre-trimmed and Crimped Nichro Stainless Steel Primary Molar Crowns (KTR, China); 3M Stainless Steel Primary Mola

APA, Harvard, Vancouver, ISO, and other styles

6

Fish, Heather, Victor J. Lieffers, Uldis Silins, and Ronald J. Hall. "Crown shyness in lodgepole pine stands of varying stand height, density, and site index in the upper foothills of Alberta." Canadian Journal of Forest Research 36, no. 9 (2006): 2104–11. http://dx.doi.org/10.1139/x06-107.

Full text

Abstract:

Crown shyness is the empty space between crowns in fully stocked stands that is not related to tree-fall gaps. The objectives of this study were to determine the stand and site factors that control crown shyness in lodgepole pine (Pinus contorta Dougl. ex Loud.) stands and to evaluate whether stands experiencing crown shyness compensate for leaf area losses by maintaining longer crowns. We measured canopy closure (i.e., the inverse of crown shyness), crown radius and length, and green litterfall in stands of various height, relative density, and site index. Canopy closure decreased with stand

APA, Harvard, Vancouver, ISO, and other styles

7

Zhang, Li Xian, and Yu Xiao Liu. "Fracture Resistance and Failure Mode of Different Type of Ceramic Crowns." Solid State Phenomena 330 (April 12, 2022): 119–24. http://dx.doi.org/10.4028/p-44ir6o.

Full text

Abstract:

Objective: To study the fracture resistance and failure modes of different type of ceramic crowns. Methods: Four groups of crown including zirconia-veneering porcelain crown (Group 1), whole zirconia crown (CAD/CAM, Group 2), cast ceramic crown (Group 3) and glass ceramic crown (CAD/CAM, chairside, Group 4) with the same thickness were manufactured, each group own 12 crowns. The fracture resistance test and failure modes analysis of the specimens were conducted, SPSS22.0 was used to analyze the difference among the groups. Results: The fracture strength of Group 2 is significantly higher than

APA, Harvard, Vancouver, ISO, and other styles

8

Rahate, Ishani, Punit Fulzele, and Nilima Thosar. "Comparative evaluation of clinical performance, child and parental satisfaction of Bioflx, zirconia and stainless steel crowns in pediatric patients." F1000Research 12 (December 21, 2023): 756. http://dx.doi.org/10.12688/f1000research.133464.2.

Full text

Abstract:

Background Pediatric dental treatment is challenging in patients with early childhood caries. For clinician its difficult to manage child and provide good work at the same time. Its necessity to have the best equipments as well as materials. Nowadays, aesthetics play an important role in managing decayed teeth. Zirconia crown is better option but requires excessive preparation. As Bioflx is newly developed crown and has combined stainless steel and zirconia properties. Aim To assess the clinical performance and child and parental satisfaction of Bioflex crowns compared to zirconia and stainles

APA, Harvard, Vancouver, ISO, and other styles

9

Rocha, Adna Alves, Marco Aurélio de Carvalho, Dimorvan Bordin, Altair Antoninha Del Bel Cury, and Priscilla Cardoso Lazari-Carvalho. "Biomechanical behavior of different designs of hybrid abutment-restoration on the posterior crown: a finite element analysis." Brazilian Dental Journal 34, no. 6 (2023): 140–49. http://dx.doi.org/10.1590/0103-6440202305539.

Full text

Abstract:

Abstract This study aimed to evaluate the influence of material and crown design on the biomechanical behavior of implant-supported crowns with hybrid abutment (HA) through three-dimensional (3D) finite element analysis. The study factors were the type of material used as the mesostructure or crown (zirconia, lithium disilicate, and hybrid ceramic) and the crown design cemented to the titanium base (mesostructure cemented to the titanium base and a crown cemented on it (HaC); hybrid crown-abutment, the abutment and crown are manufactured as a single piece and cemented to the titanium base (HC)

APA, Harvard, Vancouver, ISO, and other styles

10

Zhou, Jun Wei, and Da Zheng Wang. "Parametric Study of Crowned Blade in Horizontal Axial Turbine." Advanced Materials Research 732-733 (August 2013): 443–50. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.443.

Full text

Abstract:

The horizontal axial turbine could extract kinetic energy from both wind and tidal stream. In this paper, a type of horizontal axial turbine was designed with a crown stalled on the blade tip and the turbine was analyzed in a tidal stream. Several turbines with different geometries of the crowns were compared, whose power coefficients were numerically simulated by the CFD method. Effects of the crown design parameters, such as crown setting directions and different widths on turbine efficiency were discussed. Furthermore, when the turbine worked at different tip speed ratio, the results were d

APA, Harvard, Vancouver, ISO, and other styles

11

Zeide, Boris, and Peter Pfeifer. "A Method for Estimation of Fractal Dimension of Tree Crowns." Forest Science 37, no. 5 (1991): 1253–65. http://dx.doi.org/10.1093/forestscience/37.5.1253.

Full text

Abstract:

Abstract A method is proposed for estimating fractal dimension of tree crowns from measurements of foliage mass and crown volume. Because fractal dimensions for each of the ten investigated species were greater than two, crown surface and volume depend on the unit of measurement. The power relationship between foliage mass and crown volume reflects self-similarity of tree crowns. In all studied cases, fractal dimensions of dominant trees were greater than those of intermediate trees of the same species. Fractal dimension can be used as an indicator of tolerance, crown class, and foliage distri

APA, Harvard, Vancouver, ISO, and other styles

12

Rahate, Ishani, Punit Fulzele, and Nilima Thosar. "Comparative evaluation of clinical performance, child and parental satisfaction of Bioflex, zirconia and stainless steel crowns in pediatric patients." F1000Research 12 (June 27, 2023): 756. http://dx.doi.org/10.12688/f1000research.133464.1.

Full text

Abstract:

Background: Pediatric treatment is challenging in patients with early childhood caries. It is difficult due to the adjacency of pulp, miniature tooth size, and thin enamel compared to permanent dentition. Nowadays, aesthetics play an important role in managing decayed teeth, and children need treatment that includes full coverage crowns in either stainless steel or anesthetic crown in zirconia or the recently developed Bioflex crown. The Bioflex crowns are highly flexible and aesthetically preformed pediatric crowns with combined stainless steel and zirconia properties. This study aims to asse

APA, Harvard, Vancouver, ISO, and other styles

13

Umeki, Kiyoshi. "A comparison of crown asymmetry between Piceaabies and Betulamaximowicziana." Canadian Journal of Forest Research 25, no. 11 (1995): 1876–80. http://dx.doi.org/10.1139/x95-202.

Full text

Abstract:

Morphological plasticity in terms of asymmetric display of crowns was compared between Piceaabies (L.) Karst. and Betulamaximowicziana Regel. To evaluate crown asymmetry in relation to local environment, a model that predicts crown asymmetry from topography and configuration of neighbors was applied to data derived from a mixed forest in Hokkaido, northern Japan. Betulamaximowicziana had greater crown asymmetry than P. abies in absolute value. However, observed crown asymmetry of both species was determined by local environment to similar degrees. Some other differences were found between the

APA, Harvard, Vancouver, ISO, and other styles

14

Ex, Seth, Frederick W. Smith, and Tara L. Keyser. "Characterizing crown fuel distribution for conifers in the interior western United States." Canadian Journal of Forest Research 45, no. 7 (2015): 950–57. http://dx.doi.org/10.1139/cjfr-2014-0503.

Full text

Abstract:

Canopy fire hazard evaluation is essential for prioritizing fuel treatments and for assessing potential risk to firefighters during suppression activities. Fire hazard is usually expressed as predicted potential fire behavior, which is sensitive to the methodology used to quantitatively describe fuel profiles: methodologies that assume that fuel is distributed uniformly throughout crowns have been shown to predict less severe fire behavior than those that assume more realistic nonuniform fuel distributions. We used crown fuel data from seven interior western United States conifer species to ch

APA, Harvard, Vancouver, ISO, and other styles

15

Goelz, J. C. G. "Open-Grown Crown Radius of Eleven Bottomland Hardwood Species: Prediction and Use in Assessing Stocking." Southern Journal of Applied Forestry 20, no. 3 (1996): 156–61. http://dx.doi.org/10.1093/sjaf/20.3.156.

Full text

Abstract:

Abstract Equations were prepared to predict crown radius for eleven species of open-grown bottomland hardwood trees. Crown radius was predicted as a function of diameter at breast height (dbh) and as a function of dbh, total height, and crown ratio. Equations were prepared for individual species and species groups. Pecan (Carya illinoensis (Wangenh.) K. Koch) has the largest crowns over a broad range of dbh. Eastern cottonwood (Populus deltoides Bartr. ex Marsh.) has the smallest crowns for most levels of dbh. Sweetgum (Liquidambar styraciflua L.) has relatively small crowns for trees of small

APA, Harvard, Vancouver, ISO, and other styles

16

Boivin, Frédéric, Alain Paquette, Pierre Racine, and Christian Messier. "A fast and reliable method for the delineation of tree crown outlines for the computation of crown openness values and other crown parameters." Canadian Journal of Forest Research 41, no. 9 (2011): 1827–35. http://dx.doi.org/10.1139/x11-107.

Full text

Abstract:

Numerous crown parameters (e.g., leaf area index, diameter, height, volume) can be obtained via the analysis of tree crown photographs. In all cases, parameter values are functions of the position of the crown outline. However, no standardized method to delineate crowns exists. To explore the effect of different outlines on tree crown descriptors, in this case crown openness (CO), and facilitate the adoption of a standard method free of user bias, we developed the program Crown Delineator that automatically delineates any outline around tree crowns following predetermined sensibility settings.

APA, Harvard, Vancouver, ISO, and other styles

17

Shamim, Ahmed, and Pretzsch Hans. "TLidar-based crown shape indicates tree ring pattern in Norway spruce (Picea abies (L.) H. Karst) trees across competition gradients. A modeling and methodological approach." Ecological indicators 2023, no. 148 (2023): 110116. https://doi.org/10.5281/zenodo.7716499.

Full text

Abstract:

Tree crowns and growth rings are physiologically and functionally connected through supporting and resource sharing. Management interventions may strongly influence tree growth by altering this linkage. However, conventional approaches have limited ability to characterize crown shape precisely, thus hindering our understanding of the relationship between crown shape and tree ring patterns. We, thus, aimed to test three hypotheses: (HI) Crown shape (regularity vs. irregularity) and ring patterns (regularity or irregularity) are significantly correlated and (HII) vary across density gradients; i

APA, Harvard, Vancouver, ISO, and other styles

18

Gan, Yi, Quan Wang, and Atsuhiro Iio. "Tree Crown Detection and Delineation in a Temperate Deciduous Forest from UAV RGB Imagery Using Deep Learning Approaches: Effects of Spatial Resolution and Species Characteristics." Remote Sensing 15, no. 3 (2023): 778. http://dx.doi.org/10.3390/rs15030778.

Full text

Abstract:

The automatic detection of tree crowns and estimation of crown areas from remotely sensed information offer a quick approach for grasping the dynamics of forest ecosystems and are of great significance for both biodiversity and ecosystem conservation. Among various types of remote sensing data, unmanned aerial vehicle (UAV)-acquired RGB imagery has been increasingly used for tree crown detection and crown area estimation; the method has efficient advantages and relies heavily on deep learning models. However, the approach has not been thoroughly investigated in deciduous forests with complex c

APA, Harvard, Vancouver, ISO, and other styles

19

Miller, Nathan L., and Cynthia M. Ocamb. "Relationships Between Yield and Crown Disease of Sweet Corn Grown in the Willamette Valley of Oregon." Plant Health Progress 10, no. 1 (2009): 9. http://dx.doi.org/10.1094/php-2009-0831-01-rs.

Full text

Abstract:

Sweet corn (Zea mays L.) yields in the Willamette Valley of Oregon declined during the 1990s. Severe root rot affected some plants shortly before harvest, but was absent in other plants that showed secondary symptoms of reduced ear yield and leaf death; necrosis of stalk nodes and crown tissues was found instead. Studies were done to determine if there is a relationship among yield and necrosis of crowns, stalk nodes, nodal roots, radicles, or sub-crown internodes. An image analysis program was used to quantify the grayscale value of crown and node tissues. Regression analysis indicates that p

APA, Harvard, Vancouver, ISO, and other styles

20

Power, Hugues, Valerie LeMay, Frank Berninger, Derek Sattler, and Daniel Kneeshaw. "Differences in crown characteristics between black (Picea mariana) and white spruce (Picea glauca)." Canadian Journal of Forest Research 42, no. 9 (2012): 1733–43. http://dx.doi.org/10.1139/x2012-106.

Full text

Abstract:

Black spruce ( Picea mariana (Mill.) Britton, Sterns & Poggenb.) and white spruce ( Picea glauca (Moench) Voss) are phylogenetically proximal species that differ in productivity. Crown characteristics of these two species have not been extensively studied, in spite of the importance of these two species to the Canadian boreal forest and the importance of tree crowns for understanding and modelling tree growth. In this paper, we characterize and compare the crown lengths, crown profiles (i.e., radii), shapes, and surface areas of these two species using 65 white spruce and 57 black spruce t

APA, Harvard, Vancouver, ISO, and other styles

21

Soleimani, Fatemeh, Hamid Jalali, Azam Sadat Mostafavi, Somayeh Zeighami, and Maryam Memarian. "Retention and Clinical Performance of Zirconia Crowns: A Comprehensive Review." International Journal of Dentistry 2020 (October 15, 2020): 1–6. http://dx.doi.org/10.1155/2020/8846534.

Full text

Abstract:

Zirconia has been used for rehabilitation of edentulous spaces approximately for a decade, and there have been several reports regarding the clinical performance and retention of zirconia crowns. Outstanding mechanical properties, biocompatibility, and excellent aesthetics make zirconia-based crowns as a popular crown among the current all-ceramic crowns in restorative dentistry. However, restoration with a zirconia crown is a challenging treatment. The goal of this study was to assess the current literature to summarize the studies reporting the effective risk factors on retention of zirconia

APA, Harvard, Vancouver, ISO, and other styles

22

Seethepalli, Anand, Haichao Guo, Xiuwei Liu, et al. "RhizoVision Crown: An Integrated Hardware and Software Platform for Root Crown Phenotyping." Plant Phenomics 2020 (February 15, 2020): 1–15. http://dx.doi.org/10.34133/2020/3074916.

Full text

Abstract:

Root crown phenotyping measures the top portion of crop root systems and can be used for marker-assisted breeding, genetic mapping, and understanding how roots influence soil resource acquisition. Several imaging protocols and image analysis programs exist, but they are not optimized for high-throughput, repeatable, and robust root crown phenotyping. The RhizoVision Crown platform integrates an imaging unit, image capture software, and image analysis software that are optimized for reliable extraction of measurements from large numbers of root crowns. The hardware platform utilizes a backlight

APA, Harvard, Vancouver, ISO, and other styles

23

L Z G, Touyz. "A successful, temporary, pragmatic, emergency management of dislodged crowns." Journal of Management and Science 12, no. 3 (2022): 142–43. http://dx.doi.org/10.26524/jms.12.55.

Full text

Abstract:

Full crowns are often used as treatment in dentistry. Dislodgement of a crown may occur at any time if a negative tensile force on the crown allows displacement. Keeping the displaced crown in situ is problematic, as the crown tends to come off the stump,may be lost and or swallowed. Emergency refixing is often not feasible or available. This note suggests an easy, successful,emergency management of temporarily refixing the crown with sugarless chewing gum until the crown can be recemented by a dentist.

APA, Harvard, Vancouver, ISO, and other styles

24

Tribst, João Paulo Mendes, Amanda Maria de Oliveira Dal Piva, Azeem Ul Yaqin Syed, et al. "Comparative Stress Analysis of Polyetherketoneketone (PEKK) Telescopic Crowns Supported by Different Primary Crown Materials." Applied Sciences 12, no. 7 (2022): 3446. http://dx.doi.org/10.3390/app12073446.

Full text

Abstract:

The present study aimed to investigate the stress distribution of secondary telescopic crowns made of polyetherketoneketone (PEKK) combined with different primary crown (PC) materials (Zirconia, CoCr, Titanium, and PEKK) using finite element analysis. The geometric model was composed of bone tissue, periodontal ligament, root dentin, cement layer, primary crown, and secondary telescopic crown (SC). A total of four models were evaluated in which the secondary crowns were simulated in PEKK. The models were designed in CAD software and exported to the computer aided engineering software for the s

APA, Harvard, Vancouver, ISO, and other styles

25

Tribst, João P. M., Amanda M. O. Dal Piva, Alexandre L. S. Borges, Lilian C. Anami, Cornelis J. Kleverlaan, and Marco A. Bottino. "Survival Probability, Weibull Characteristics, Stress Distribution, and Fractographic Analysis of Polymer-Infiltrated Ceramic Network Restorations Cemented on a Chairside Titanium Base: An In Vitro and In Silico Study." Materials 13, no. 8 (2020): 1879. http://dx.doi.org/10.3390/ma13081879.

Full text

Abstract:

Different techniques are available to manufacture polymer-infiltrated ceramic restorations cemented on a chairside titanium base. To compare the influence of these techniques in the mechanical response, 75 implant-supported crowns were divided in three groups: CME (crown cemented on a mesostructure), a two-piece prosthetic solution consisting of a crown and hybrid abutment; MC (monolithic crown), a one-piece prosthetic solution consisting of a crown; and MP (monolithic crown with perforation), a one-piece prosthetic solution consisting of a crown with a screw access hole. All specimens were st

APA, Harvard, Vancouver, ISO, and other styles

26

Clatterbuck, Wayne K., Tyler M. L. Brannon, and Edward C. Yost. "Branch Elongation, Bud Durability, and Wind-Generated Crown Movement Associated with Crown Abrasion in Deciduous Trees." Forests 15, no. 2 (2024): 247. http://dx.doi.org/10.3390/f15020247.

Full text

Abstract:

Trees that grow in close proximity to other trees are subject to crown and branch abrasion, causing mechanical injury. The loss of branch tips and buds through abrasion can affect the architecture and growth of tree crowns. This research quantifies the impacts of crown abrasion between neighboring trees of several deciduous species and how crown abrasion may influence stand dynamics. Tree interactions were evaluated during the dormant and growing seasons to determine how wind-generated movement affects crowns under foliated and un-foliated conditions. Branch elongation was measured in tree cro

APA, Harvard, Vancouver, ISO, and other styles

27

Mattoo, Khurshid A., Faisal M. Alkhayrat, Hussam A. Madkhali, Ibrahim H. Geathy, Mohammed AW Qahhar, and Ahmed Yaqoub. "Subjective Differences between Dentists and Patients about Relative Quality of Metal Ceramic Restorations placed in the Esthetic Zone." Journal of Contemporary Dental Practice 18, no. 2 (2017): 112–16. http://dx.doi.org/10.5005/jp-journals-10024-2000.

Full text

Abstract:

ABSTRACT Introduction Esthetic perceptions could differ between the dentist and his patients among various regions and cultures. Aim The aims of this study were to evaluate the subjective differences between the dentist and the patient in terms of esthetics of metal-ceramic crowns (MCcs). The study also aims to compare the mesiodistal (MD) and buccolingual (BL) dimensions of the cemented crown with its respective natural antimeric tooth. Materials and methods A total of 85 patients seeking treatment for a single crown (MC) were treated by the undergraduate students under supervision of respect

APA, Harvard, Vancouver, ISO, and other styles

28

Biging, Greg S., and Lee C. Wensel. "Estimation of crown form for six conifer species of northern California." Canadian Journal of Forest Research 20, no. 8 (1990): 1137–42. http://dx.doi.org/10.1139/x90-151.

Full text

Abstract:

Geometric models are presented for the prediction of crown volume and width at any height in the crown of six conifer species in the Sierra Nevada. Crown volume is defined as the geometric space occupied by the crown and is allometrically related to the diameter, height, and crown ratio of individual trees. Crown diameter is derived from crown volume, tree height, and crown ratio. The crown volumes and associated measures can be used to compute indices of individual tree competition such as those used in the CACTOS (California Conifer Timber Output Simulator) system or to compute other measure

APA, Harvard, Vancouver, ISO, and other styles

29

Allen, Douglas C., Charles J. Barnett, Imants Millers, and Denis Lachance. "Temporal change (1988–1990) in sugar maple health, and factors associated with crown condition." Canadian Journal of Forest Research 22, no. 11 (1992): 1776–84. http://dx.doi.org/10.1139/x92-232.

Full text

Abstract:

Change in the health of sugar maple (Acersaccharum Marsh.) and associated northern hardwoods was evaluated for 3 years (1988–1990) in seven states and four provinces. Generally, levels of crown dieback and crown transparency (a measure of foliage density) in 165 stands decreased during this period. In 1990, less than 7% of all dominant–codominant sugar maples (n = 7317) exhibited crown dieback ≥ 20%. Significantly (p = 0.05) fewer of these maples were classified as having high crown transparency (≥ 30%) in 1990 compared with 1988. Crowns of maples that received moderate (31–60%) or heavy (>

APA, Harvard, Vancouver, ISO, and other styles

30

Aristiyanto, Regia, and Diatri Nari Ratih. "Functional Crown Lengthening: Biological Width Correction." Journal of Indonesian Dental Association 3, no. 1 (2020): 43. http://dx.doi.org/10.32793/jida.v3i1.427.

Full text

Abstract:

Introduction: Functional crown lengthening is one of the most common surgical procedures that facilitating restorative treatment. It was done on teeth with inadequate clinical crowns in the presence of deep and subgingival pathologies. Inadequate clinical crowns defined as tooth with less than 2 mm cervico-incisal of sound. Case Report: The 32 years old female patient complained on broken restoration on upper left anterior tooth since one week ago. He also complained about upper right anterior tooth that turned brown. The tooth had received root canal treatment with direct composite restoratio

APA, Harvard, Vancouver, ISO, and other styles

31

Harshitha, A. K., H. T. Ajay Rao, K. Sundeep Hegde, Sharan S. Sargod, Shrivya Saloni Mahaveeran, and Arya Devan. "Comparative evaluation on clinical success rate of prefabricated zirconia crowns and stainless steel crowns in primary molars." International Journal of Oral Health Dentistry 7, no. 3 (2021): 180–86. http://dx.doi.org/10.18231/j.ijohd.2021.036.

Full text

Abstract:

To compare the clinical success rate of Prefabricated Zirconia crowns and stainless steel crowns on primary molars: It is an in-vivo study which was performed on 52 pulpally treated primary molars of children aged 4–9 years were randomly divided into two equal groups of stainless steel crown and Prefabricated Zirconia crowns. Tooth preparation was done according to the manufacturer’s recommendations and crowns were cemented. All crowns were cemented with Type I Glass ionomer cement (GIC) luting cement. Crowns were evaluated clinically for its crown retention, marginal integrity and gingival he

APA, Harvard, Vancouver, ISO, and other styles

32

Zeide, Boris, and Charles A. Gresham. "Fractal dimensions of tree crowns in three loblolly pine plantations of coastal South Carolina." Canadian Journal of Forest Research 21, no. 8 (1991): 1208–12. http://dx.doi.org/10.1139/x91-169.

Full text

Abstract:

Because crown structure is closely associated with many aspects of tree growth, fractal dimension of the crown is likely to be a useful indicator of tree form as well as growth. This paper investigates the relationship between the fractal dimension of crowns and two growth-regulating factors, site quality and thinning intensity. The two-surface method allows one to calculate fractal dimension from the regression of foliage area (or mass) on the area (or volume) of the convex hull that envelopes the crown. The hull's volume can be computed from the length and width of a crown using an equation

APA, Harvard, Vancouver, ISO, and other styles

33

KS, Madhusudhan, Rathnashree MV, and Priya Subramaniam. "Aesthetic Management of Multisurface Caries tooth with Bioflx Crown – A Case Report." ENVIRO Dental Journal 05, no. 02 (2024): 54–58. http://dx.doi.org/10.12944/edj.05.02.06.

Full text

Abstract:

Managing teeth that are deciduous, deformed, decayed, or traumatized using tooth-colored restorations can be challenging, especially with young children who may have specific behavioral intervention issues. For deciduous teeth with developmental abnormalities, multi-surface caries, high-caries patients, broken teeth, teeth where direct restorations tend to fail, following pulpal treatment, as space maintainer abutments, and teeth with severe wear, extra-coronal full-coverage crowns are recommended to ensure effective treatment. In pediatric dentistry, several full coverage restoration techniqu

APA, Harvard, Vancouver, ISO, and other styles

34

Konôpka, Bohdan, Jozef Pajtík, Vladimír Šebeň, Katarína Merganičová, and Peter Surový. "Silver birch aboveground biomass allocation pattern, stem and foliage traits with regard to intraspecific crown competition." Central European Forestry Journal 66, no. 3 (2020): 159–69. http://dx.doi.org/10.2478/forj-2020-0013.

Full text

Abstract:

Abstract In the conditions of Central Europe, silver birch (Betula pendula Roth) has so far not been an important species for commercial purposes but might be relevant from ecological point of view. For instance, prompt succession by birch and other pioneer tree species at large-scale post-disturbance areas is necessary to compensate for previous carbon losses by natural disasters. Therefore, our attention was focused on 14-year-old birch trees growing at the wind-thrown area in the High Tatra Mts. (northern Slovakia). We sampled aboveground biomass of 20 silver birch trees representing four c

APA, Harvard, Vancouver, ISO, and other styles

35

Ninawe, Nupur Suresh, Priyanka Airen, Nilam Vitthalrao Honaje, Naveen Reddy, and Devendra Nagpal. "Evaluation of stress distribution of masticatory forces on Zirconia, Bioflx, and Graphene crown in primary mandibular molars using finite element analysis." Journal of Indian Society of Pedodontics and Preventive Dentistry 43, no. 1 (2025): 136–42. https://doi.org/10.4103/jisppd.jisppd_473_24.

Full text

Abstract:

Background: A study was conducted to analyze the stress distribution of masticatory forces on Zirconia (Kids e), Bioflx (Kids e), and experimental Graphene crowns in primary mandibular molars using finite element analysis (FEA). The research aimed to assess the comparative performance of these materials to better understand their suitability for dental applications. Settings and Design: This was an in vitro study conducted using FEA models developed from cone-beam computed tomography (CBCT) images of primary mandibular second molars. The study compared stress distribution on three crown materi

APA, Harvard, Vancouver, ISO, and other styles

36

Cohn, Gregory M., Russell A. Parsons, Emily K. Heyerdahl, Daniel G. Gavin, and Aquila Flower. "Simulated western spruce budworm defoliation reduces torching and crowning potential: a sensitivity analysis using a physics-based fire model." International Journal of Wildland Fire 23, no. 5 (2014): 709. http://dx.doi.org/10.1071/wf13074.

Full text

Abstract:

The widespread, native defoliator western spruce budworm (Choristoneura occidentalis Freeman) reduces canopy fuels, which might affect the potential for surface fires to torch (ignite the crowns of individual trees) or crown (spread between tree crowns). However, the effects of defoliation on fire behaviour are poorly understood. We used a physics-based fire model to examine the effects of defoliation and three aspects of how the phenomenon is represented in the model (the spatial distribution of defoliation within tree crowns, potential branchwood drying and model resolution). Our simulations

APA, Harvard, Vancouver, ISO, and other styles

37

Antos, Joseph A., Roberta Parish, and Gordon D. Nigh. "Effects of neighbours on crown length of Abies lasiocarpa and Picea engelmannii in two old-growth stands in British Columbia." Canadian Journal of Forest Research 40, no. 4 (2010): 638–47. http://dx.doi.org/10.1139/x10-011.

Full text

Abstract:

Crown length is a key aspect of vertical structure in multi-aged, multistrata, mixed-species forests. Crown length, defined as the distance from the tree top to the lowest live branch whorl, was determined for 3169 mapped trees ≥4.0 cm in diameter, in four 0.25 ha plots in each of two old-growth Abies lasiocarpa (Hook.) Nutt. – Picea engelmannii Parry ex Engelm. stands. We randomly selected half the trees to build models and half for validation. Crown length was modelled as a function of tree height, incorporating modifiers to account for neighbouring trees. The inclusion radius and height thr

APA, Harvard, Vancouver, ISO, and other styles

38

Wilson, Neil A., Shaun A. Whitehead, Ivar A. Mjör, and Nairn HF Wilson. "Reasons for the Placement and Replacement of Crowns in General Dental Practice." Primary Dental Care os10, no. 2 (2003): 53–59. http://dx.doi.org/10.1308/135576103322500746.

Full text

Abstract:

Aims The purpose of the study was to apply established methods to survey reasons for the placement and replacement of crowns in general dental practice in the United Kingdom. Materials and Methods One hundred and twenty-eight general dental practitioners were recruited. Participants recorded the principal reason for the provision of each initial and replacement crown they provided over a 12-week period. Results Overall, data were collected from 92 practitioners in respect of 1714 patients and 2164 crowns, of which 1452 (67%) were initial placements and 712 (33%) replacements. The teeth most fr

APA, Harvard, Vancouver, ISO, and other styles

39

Javed, Faizan, Aysha Arif, and Farhan Raza Khan. "Comparison of marginal accuracy in two different materials used in provisional crown & bridge – an in vitro experimental study." Journal of the Pakistan Medical Association 73, no. 3 (2023): 567–74. http://dx.doi.org/10.47391/jpma.5008.

Full text

Abstract:

Objective: To determine the difference in the marginal accuracy at buccal, lingual, mesial and distal margins of temporary crowns fabricated with bisacryl-based temporary crown material. Method: The in-vitro, experimental, laboratory-based study was conducted at the Aga Khan University, Karachi, from September to December 2019, and comprised two bisacryl-based temporary crown material, Integrity and Protemp 4, which were used to fabricate a sample of 24 temporary crowns. A pre-operative polyvinyl siloxane impression served as a template for temporary crown fabrication. A right mandibular molar

APA, Harvard, Vancouver, ISO, and other styles

40

Escoto-Rodríguez, Martín, José M. Facelli, and Jennifer R. Watling. "Do wide crowns in arid woodland trees reflect hydraulic limitation and reduction of self-shading?" Functional Plant Biology 41, no. 12 (2014): 1221. http://dx.doi.org/10.1071/fp14022.

Full text

Abstract:

In arid regions many tree species develop broad crowns. A number of hypotheses involve trade-offs between growth in height and horizontal spreading, but there is no explanation for the switch from vertical to horizontal growth during development. Using Acacia papyrocarpa Benth as a model, we measured tree height and crown shape across different sites and topographic positions. We also measured δ13C of phyllodes from crown tops and lateral spreading branches. Trees were significantly taller at the base of a hill, where water availability is typically greater, than on the adjacent steep hillslop

APA, Harvard, Vancouver, ISO, and other styles

41

He, Jinchao, Hao Yuan, Xiaolong He, Chunhang Xie, Haonan Peng, and Ruichang Hu. "Droplet Impact on a Moving Thin Film with Pseudopotential Lattice Boltzmann Method." Mathematical Problems in Engineering 2020 (July 15, 2020): 1–15. http://dx.doi.org/10.1155/2020/1801639.

Full text

Abstract:

The pseudopotential lattice Boltzmann method (LBM) with a tunable surface tension term is applied to study a droplet impact on a moving thin film. The Re effects of dimensionless parameters on the upstream and downstream crown evolution are studied, including Reynolds number (Re), Weber number (We), liquid film thickness, and horizontal velocity of the liquid film. The movement of the liquid film causes the asymmetry development of the upstream and downstream crown. Both the instability of upstream and downstream crowns increases with the increase of Re and We, and the upstream crown becomes m

APA, Harvard, Vancouver, ISO, and other styles

42

Sterba, Hubert, and Ralph L. Amateis. "Crown efficiency in a loblolly pine (Pinus taeda) spacing experiment." Canadian Journal of Forest Research 28, no. 9 (1998): 1344–51. http://dx.doi.org/10.1139/x98-115.

Full text

Abstract:

Crown efficiency was first defined by Assmann (1961. Waldertragskunde. BLV, München) as individual tree volume increment per unit of crown projection area. He hypothesized that within a given crown class, smaller crowns are more efficient because their ratio between crown surface and horizontal crown projection is higher. Data from a loblolly pine (Pinus taeda L.) spacing experiment were used to test if this hypothesis also holds in young loblolly pine stands and, if so, to determine if it explains the increment differences between spacings in the spacing experiment. Using individual tree heig

APA, Harvard, Vancouver, ISO, and other styles

43

Taghi Zade, Mehdi, Maryam Tehranchi, Mohammad Amin Bafandeh, Seyed Mohammad Reza Hakimaneh, Yasaman Sherafatmand, and Sayed Shojaedin Shayegh. "A Comparison of the Effect of Zirconia Crown on Periodontal Tissues: A Nonrandomized Clinical Trial." Avicenna Journal of Dental Research 16, no. 1 (2024): 57–62. http://dx.doi.org/10.34172/ajdr.1693.

Full text

Abstract:

Background: Dental crowns are effective on the gingival tissue around the teeth. However, using zirconia as crowns due to the method and type of material can effectively improve this effect. Methods: This is a pre-post clinical trial conducted on 35 teeth with metal-ceramic crowns and 35 teeth with zirconia crowns. Teeth were prepared for fabricating metal-ceramic and zirconia crowns. Plaque index (PI), modified gingival index (MGI), pocket probing depth (PPD), papilla bleeding index (PBI), and gingival level (GL) were measured before and six months after getting the dental crown. The data wer

APA, Harvard, Vancouver, ISO, and other styles

44

Aryal, Bimal, James Steenberg, and Peter Duinker. "The Effects of Residential Street Tree Spacing and Crown Interactions on Crown Dimensions and Canopy Cover." Arboriculture & Urban Forestry 47, no. 5 (2021): 183–95. http://dx.doi.org/10.48044/jauf.2021.017.

Full text

Abstract:

Urban trees provide people with a range of ecosystem services. Trees planted along streets have been a large focus of urban forest research and practice, and municipalities invest significant resources in their survival. However, the optimal spacing of street trees is not addressed in the scientific literature, and existing municipal street tree spacing standards are highly variable and poorly enforced. In this study, we examine variability in crown shape and size for street trees to test for possible interaction effects at closer spacings. We measured variability in crown diameters both paral

APA, Harvard, Vancouver, ISO, and other styles

45

Ankoh, Stephen Ekow, Patrick Caldicock Ampofo, Sandra Ama Hewlett, et al. "Analysis of Resistance Form of Molar Crown Preparations for Full-Coverage Porcelain Fused to Metal Crowns: A Prospective Study at The University of Ghana Dental School." International Journal of Dentistry Research 9, no. 2 (2024): 46–48. https://doi.org/10.31254/dentistry.2024.9204.

Full text

Abstract:

Background: A good molar crown preparation with adequate resistance form for a porcelain fused to metal (PFM) crown should have a minimum height of 4mm, a maximum width of 10mm and a height-to-width ratio of at least 0.4. Aims and Objectives: To determine whether the molar crown preparations for full-coverage PFM crowns made by Resident dentists at the University of Ghana Dental School (UGDS) meet the recommended requirements for resistance form. Study design: This is a cross-sectional study to analyse the resistance form of molar crown preparation of patients scheduled for full-coverage PFM c

APA, Harvard, Vancouver, ISO, and other styles

46

Larsson, Adam, Justice Manuh, and Bruno Ramos Chrcanovic. "Risk Factors Associated with Failure and Technical Complications of Implant-Supported Single Crowns: A Retrospective Study." Medicina 59, no. 9 (2023): 1603. http://dx.doi.org/10.3390/medicina59091603.

Full text

Abstract:

Background and Objectives: Implant-supported single crowns have become a routine approach for the replacement of missing single teeth, being considered as one of the most common ways of rehabilitation when adjacent teeth are healthy. The present retrospective study aimed to investigate the risk factors possibly associated with failure and technical complications of implant-supported single crowns and their supporting implants. Materials and Methods: Patients treated at one faculty (2009–2019) were considered for inclusion. Complications investigated included ceramic fracture/chipping, crown lo

APA, Harvard, Vancouver, ISO, and other styles

47

van Foreest, Andries, and Joost Roeters. "Evaluation of the Clinical Performance and Effectiveness of Adhesively-Bonded Metal Crowns on Damaged Canine Teeth of Working Dogs over a Two- to 52-Month Period." Journal of Veterinary Dentistry 15, no. 1 (1998): 13–20. http://dx.doi.org/10.1177/089875649801500101.

Full text

Abstract:

In this clinical study, 41 metal full crown restorations of canine teeth were placed in 18 working dogs. Twenty-six canine teeth had severe attrition with no involvement of the pulp cavities; 15 fractured canine teeth were endodontically treated. With the exception of one tooth, at least one-third of the coronal part of each canine tooth was available for a supragingivally performed, minimal tooth crown preparation. A dental resin luting cement technique was used to bond the electrolytically etched crown (made from an alloy of cobalt-chrome-molybdenum) to the tooth. The metal crowns were sligh

APA, Harvard, Vancouver, ISO, and other styles

48

Peterson, J. A., J. R. Seiler, J. Nowak, S. E. Ginn, and R. E. Kreh. "Growth and Physiological Responses of Young Loblolly Pine Stands to Thinning." Forest Science 43, no. 4 (1997): 529–34. http://dx.doi.org/10.1093/forestscience/43.4.529.

Full text

Abstract:

Abstract Although yield responses to thinning in loblolly pine have been well documented, short- and long-term morphological and physiological changes are largely unknown. To investigate these responses, three 8-yr-old, 0.2024 ha replicate stands of loblolly pine were thinned by 50% in May 1988, and bole growth and morphological changes in the crown were measured annually for the next 6 yr. In situ gas exchange measurements were monitored in the upper and lower third of the crowns monthly during the third through sixth growing seasons following thinning. First- and second-year physiological re

APA, Harvard, Vancouver, ISO, and other styles

49

Wu, Xuhan, Weiliang Fan, Huaqiang Du, Hongli Ge, Feilong Huang, and Xiaojun Xu. "Estimating Crown Structure Parameters of Moso Bamboo: Leaf Area and Leaf Angle Distribution." Forests 10, no. 8 (2019): 686. http://dx.doi.org/10.3390/f10080686.

Full text

Abstract:

Both leaf area (LA) and leaf angle distribution are the most important eco-physiological measures of tree crowns. However, there are limited published investigations on the two parameters of Moso bamboo (Phyllostachys edulis (Carrière) J. Houz., abbreviated as MB). The aim of this study was to develop allometric equations for predicting crown LA of MB by taking the diameter at breast height (DBH) and tree height (H) as predictors and to investigate the leaf angle distribution of a MB crown based on direct leaf angle measurements. Data were destructively sampled from 29 MB crowns including DBH,

APA, Harvard, Vancouver, ISO, and other styles

50

Dai, Mingrui, and Guohua Li. "Soft Segmentation and Reconstruction of Tree Crown from Laser Scanning Data." Electronics 12, no. 10 (2023): 2300. http://dx.doi.org/10.3390/electronics12102300.

Full text

Abstract:

Point cloud data obtained by laser scanning can be used for object shape modeling and analysis, including forest inventory. One of the inventory tasks is individual tree extraction and measurement. However, individual tree segmentation, especially tree crown segmentation, is challenging. In this paper, we present a novel soft segmentation algorithm to segment tree crowns in point clouds automatically and reconstruct the tree crown surface from the segmented crown point cloud. The soft segmentation algorithm mainly processes the overlapping region of the tree crown. The experimental results sho

APA, Harvard, Vancouver, ISO, and other styles

We offer discounts on all premium plans for authors whose works are included in thematic literature selections. Contact us to get a unique promo code!