Results 51 to 60 of about 252 (179)

Immediate Placement of an Implant Connected to a Customized Zirconia Membrane in Compromised Sockets: First Two Case Reports

Clinical Case Reports, Volume 14, Issue 7, July 2026.
Digital planning of the implant and CZM in the maxilla. (a, b) CBCT measures; (c) ZM in blue and axis of the future abutment in yellow; (d) connection of the implant (red) to the ZM connector at the inner surface (green arrow); (e) position of the assembly ZM/Implant; (f) ZM for clinical use with perforations; (g) the ZM connector; (h) screw fixation ...
Laith Glissa, Latifa Berrezouga
wiley   +1 more source

A Stepwise Approach to Managing Bilateral Maxillary Sinus Tracts: A Case Report

Clinical Case Reports, Volume 14, Issue 7, July 2026.
ABSTRACT This case report describes a rare presentation of bilateral intraoral sinus tracts of odontogenic origin associated with a maxillary right first molar (Universal #3). A key diagnostic challenge was differentiating an endodontic infection from vertical root fracture (VRF) in a previously treated tooth; no J‐shaped probing defect was detected ...
Ali Chamani, Maryam Forghani, Reza Shakiba, Arsalan Shahri   +3 more
wiley   +1 more source

Coral reef and mangrove interplay during Holocene sea level changes, Belitung Island, Indonesia

Earth Surface Processes and Landforms, Volume 51, Issue 7, July 2026.
The fate of mangroves and coral reefs during the ongoing sea level rise depends not only on our ability to preserve the ecosystems but also on their geological preconditioning. Therefore, strategies to preserve mangrove ecosystems, while undoubtedly essential, wecan only be successful if accounting for their geological history. Abstract Coral reefs and
Tubagus Solihuddin, Gino de Gelder, Dwi Amanda Utami, Frida Sidik, Rima Rachmayani, Marfasran Hendrizan, Sri Yudawati Cahyarini, Meggi Rhomadona Purnama, Dilruba Erkan, Millary Widiawaty, Mary Elliot, Laurent Husson   +11 more
wiley   +1 more source

Digital monitoring of rotary-percussive drilling with down-the-hole hammer for profiling weathered granitic ground

Journal of Rock Mechanics and Geotechnical Engineering
Rock and geotechnical engineering investigations involve drilling holes in ground with or without retrieving soil and rock samples to construct the subsurface ground profile.
Wendal Victor Yue, Siyuan Wu, Manchao He, Yafei Qiao, Zhongqi Quentin Yue   +4 more
doaj   +1 more source

Energy Transmission in Percussive Drilling [PDF]

Fall Meeting of the Society of Petroleum Engineers of AIME, 1959
Abstract A simple analysis of the mechanics of stress and energy transmission in percussive drilling is presented. Four basic components of the system are recognized:the hammer,the drill rod,the bit, andthe rock and the effect of each in determining the ultimate energy transmitted into the rock is considered.
openaire   +1 more source

Computer simulation of percussive drilling.

Shigen-to-Sozai, 1991
A drilling model which consists of drill-body, piston, rod and bit is presented. The model is based on onedimensional stress-wave theory for piston, rod and bit. A force/penetration relationship with hysteresis is assumed for bit/rock interaction. A computer program based on the model is also developed which allows continuous simulation of drilling ...
OKUBO, Seisuke, NISHIMATSU, Yuichi
openaire   +2 more sources

Study on Gas–Solid Particle Dynamics and Optimal Drilling Parameters in Reverse Circulation DTH Drilling Based on CFD and Machine Learning

Applied Sciences
The reverse circulation pneumatic down-the-hole (DTH) drilling system employs percussive drilling to achieve high efficiency and strong adaptability across diverse rock formations. However, its cutting removal efficiency remains suboptimal.
Kunkun Li, Jing Zhou, Peizhi Yu, Hao Wu, Tianhao Xu   +4 more
doaj   +1 more source

Propagation Characteristics of Bottomhole Cracks Created by the Percussive-Rotary Stepping Drilling ROP Improving Method

Shiyou jixie
In order to solve the problems of poor rock drillability,low rock-breaking efficiency and short service life caused by high hardness,high strength and stress concentration of bottomhole rock in deep formations,a new concept of ROP improvement by ...
Liu Yongwang, Liu Jiaxiong, Guan Zhichuan, Wang Huajian, Zhao Guoshan, Zhang Shuhui   +5 more
doaj  

Percussive-rotary Drilling Tool with Spring Accumulating Collision

Shiyou jixie, 2015
Percussive-rotary drilling technology is one of the effective ways to improve the drilling speed of deep and super-deep wells.Percussive-rotary drilling tool with spring accumulating collision is developed by combining a short positive displacement motor
Xuan Lingchao, Guan Zhichuan, Zhang Huizeng, Liu Yongwang   +3 more
doaj  

Development and application of MWD system for DTH drilling rig

Yantu gongcheng xuebao
The researches on the measurement while drilling (MWD) technology in the field of open-pit mining are still in the early stage, and the development of MWD systems is the primary task to realize the application of MWD technology in the mining engineering ...
HOU Shijun 1, DING Weijie 1, TIAN Shuaikang 1, LIANG Shufeng 1, LIU Dianshu 1, GUO Dachao 2
doaj   +1 more source