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self-drilling screw

Michele Tepedino, Francesco Masedu, Claudio Chimenti
BACKGROUND: The aim of the present study was to evaluate the relationship between insertion torque and stability of miniscrews in terms of resistance against dislocation, then comparing a self-tapping screw with a self-drilling one. METHODS: Insertion torque was measured during placement of 30 self-drilling and 31 self-tapping stainless steel miniscrews (Leone SpA, Sesto Fiorentino, Italy) in synthetic bone blocks. Then, an increasing pulling force was applied at an angle of 90° and 45°, and the displacement of the miniscrews was recorded...
May 30, 2017: Head & Face Medicine
Irina Bolm, Elisabeth Goetze, Peer W Kämmerer, Robert Sader, Michelle Klos, Constantin Landes, Bilal Al-Nawas
BACKGROUND: Self-drilling osteosynthesis screws (SDS) have a potential higher primary stability together with clinical advantages such as less time effort compared to self-tapping screws (STS). The aims of the study were to compare the primary stability of SDS and STS ex vivo and to analyze of the time-saving effect in vivo. MATERIALS AND METHODS: Ex vivo, both screws were placed in porcine bone. Torque was measured for insertion and removal. Four specimens were kept in bone for histologic bone-to-implant-contact examination...
May 15, 2017: Journal of Surgical Research
Guang Wen, Jing Di, Qian Li, Jianling Chen, Ling Jin, Cheng Wang, Sanqing Xu
BACKGROUND: The new method described here is highly efficient in transferring microinjected mouse eggs (MEs) through the bursa membrane of a surrogate mother mouse to the ampulla of the oviduct without damaging the blood vessels on the bursa membrane. RESULTS: This method causes no loss of blood, and it produces newborn pups/founders from approximately 70% of the transferred MEs, because only a small hole is made on the blood vessel-free area of the bursa membrane and ampulla of the surrogate mother mouse...
2016: SpringerPlus
Reint Meursinge Reynders, Giorgio Cacciatore
Data sourcesMedline, Cochrane Central Register of Controlled Trials (CENTRAL), Embase, China National Knowledge Infrastructure (CNKI) and SIGLE.Study selectionRandomised controlled trials(RCTs), clinical controlled trials (CCTs) and cohort studies that assessed the success/failure rates of self-drilling and self-tapping mini-screws for orthodontic anchorage were considered.Data extraction and synthesisData was abstracted and assessed for quality by two reviewers independently. The Newcastle-Ottawa scale (NOS) was used to evaluate the methodological quality...
December 2016: Evidence-based Dentistry
Yara K Hosein, S Jeffrey Dixon, Amin S Rizkalla, Ali Tassi
PURPOSE: Mechanical loosening remains a common complication associated with mini-implant failure. The purpose of this study was to compare common mechanical measures of mini-implant stability to determine their association and reliability. MATERIALS AND METHODS: Ninety self-drilling orthodontic mini-implants from 6 manufacturers were inserted into artificial bone blocks. Insertion torques (ITs) and Periotest values (PVs) were measured. Subsequently, mini-implants underwent pull-out testing for measures of pull-out load (POL) and screw displacement (ScrD)...
April 2017: Implant Dentistry
Benoit Schaller, Nikola Saulacic, Stefan Beck, Thomas Imwinkelried, Bee Tin Goh, Ken Nakahara, Willy Hofstetter, Tateyuki Iizuka
Self-tapping of magnesium screws in hard bone may be a challenge due to the limited torsional strength of magnesium alloys in comparison with titanium. To avoid screw failure upon implantation, the new concept of a rivet-screw was applied to a WE43 magnesium alloy. Hollow cylinders with threads on the outside were expanded inside drill holes of minipig mandibles. During the expansion with a hexagonal mandrel, the threads engaged the surrounding bone and the inside of the screw transformed into a hexagonal screw drive to allow further screwing in or out of the implant...
December 1, 2016: Materials Science & Engineering. C, Materials for Biological Applications
Tien-Hsiang Wang, Hsu Ma, Ching-Shiow Tseng, Yi-Hong Chou, Kun-Lin Cai
Surgical navigation systems have been an important tool in maxillofacial surgery, helping surgeons create a presurgical plan, locate lesions, and provide guidance. For secondary facial bone reductions, a good presurgical plan and proper execution are the key to success. Previous studies used predetermined markers and screw holes as navigation references; however, unexpected situations may occur, making the predetermined surgical plan unreliable. Instead of determining positions preoperatively, this study proposes a method that surgeons can use intraoperatively to choose surface markers in a more flexible manner...
2016: Journal of Medical and Biological Engineering
Alexandre Ricardo Dal Molin Molinari, Cesar Augusto Thomé, Luis Mauro Moura, Sung Hyun Kim
STATEMENT OF PROBLEM: Several studies have demonstrated the harmful role of heat generation during implant site drilling in subsequent bone healing. However, heat generation during implant placement should also be carefully considered. PURPOSE: The purpose of this in vitro study was to evaluate thermal change in a resin block during motorized and manual implant placement with and without saline irrigation. MATERIAL AND METHODS: Thermocouple probes were placed in resin blocks to measure the thermal change during forty 3...
December 2016: Journal of Prosthetic Dentistry
R Srnec, P Fedorová, J Pěnčík, L Vojtová, M Sedlinská, A Nečas
UNLABELLED: PURPOSE OF THE STUDY In a long-term perspective, it is better to remove implants after fracture healing. However, subsequent full or excessive loading of an extremity may result in refracture, and the bone with holes after screw removal may present a site with predilection for this. The aim of the study was to find ways of how to decrease risk factors for refracture in such a case. This involved support to the mechanical properties of a bone during its remodelling until defects following implant removal are repaired, using a material tolerated by bone tissue and easy to apply...
2016: Acta Chirurgiae Orthopaedicae et Traumatologiae Cechoslovaca
Jianru Yi, Mengke Ge, Meile Li, Chunjie Li, Yu Li, Xiaobing Li, Zhihe Zhao
Background: Both the self-drilling and self-tapping miniscrews have been commonly used as anchorage reinforcement devices in orthodontic treatment. Objective: The aim of this study was to compare the success rates of self-drilling and self-tapping miniscrews in orthodontic practice. Search methods: Literature searches were performed by electronic search in database including PubMed, Embase, Cochrane Central Register of Controlled Trials, China National Knowledge Infrastructure and SIGLE, and manual search of relevant journals and reference lists of included studies...
June 1, 2017: European Journal of Orthodontics
Arnold P Pietsch, Stefan Raith, Jan-Eric Ode, Jan Teichmann, Bernd Lethaus, Stephan C Möhlhenrich, Frank Hölzle, Georg N Duda, Timm Steiner
The goal of this study was to determine a combination of screw and transplantation type that offers optimal primary stability for reconstructive surgery. Fibular, iliac crest, and scapular transplants were tested along with artificial bone substrate. Six different kinds of bone screws (Medartis(©)) were compared, each type utilized with one of six specimens from human transplants (n = 6). Controlled screw-in-tests were performed and the required torque was protocolled. Subsequently, pull-out-tests were executed to determine the retention forces...
June 2016: Journal of Cranio-maxillo-facial Surgery
Cennet Neslihan Eroglu, Abdullah Seckin Ertugrul, Murat Eskitascioglu, Gurcan Eskitascioglu
OBJECTIVE: The aim of this study was to determine whether there are any changes in the surface of bone or implant structures following the removal of a screwed dental implant. MATERIALS AND METHODS: For this, six individual samples of acid-etched and sandblasted implants from three different manufacturers' implant systems were used. They were screwed in a D1 bovine bone, and they were removed after primary stabilization. The bone and implant surfaces are evaluated with scanning electron microscope...
January 2016: European Journal of Dentistry
Alexaner Synek, Lars Borgmann, Hannes Traxler, Wolfgang Huf, Ekkehard Euler, Yan Chevalier, Sebastian F Baumbach
BACKGROUND: Symptomatic extensor tendon irritation is a frequent complication in volar plate osteosynthesis of distal radius fractures. It is typically caused by dorsal screw protrusion and overdrilling of the dorsal cortex. The use of self-drilling locking screws (SDLS) could overcome both causes. The practical applicability of SDLS depends on two prerequisites: (1) the feasibility of preoperative distal screw length determination, and (2) sufficient primary biomechanical stability of SDLS compared to standard locking screws (SLS)...
March 10, 2016: BMC Musculoskeletal Disorders
Kyung A Kim, Yu Chen, Soon-Yong Kwon, Kyung Won Seo, Ki-Ho Park, Seong-Hun Kim
OBJECTIVES/INTRODUCTION: This article represents clinical application of spike screw, novel design of miniscrew, for direct anchorage and indirect anchorage in orthodontic treatment. Accompanied by easy placement and removal, the spike screw provides good stability for the orthodontic anchorage. MATERIALS AND METHODS: The spike screw consists of 6 spikes attached to a washer with laser welded stainless-steel hook that is placed by self-drilling fixation miniscrew...
October 2015: Journal of Craniofacial Surgery
Masako Tabuchi, Takayuki Ikeda, Kahori Nakagawa, Makoto Hirota, Wonhee Park, Ken Miyazawa, Shigemi Goto, Takahiro Ogawa
INTRODUCTION: The objective of this study was to examine the effects of ultraviolet-mediated photofunctionalization of miniscrews and the in-vivo potential of bone-miniscrew integration. METHODS: Self-drilling orthodontic miniscrews made from a titanium alloy were placed in rat femurs. Photofunctionalization was performed by treating the miniscrews with ultraviolet light for 12 minutes with a photo device immediately before implantation. Maximum insertion torque (week 0), removal torque (weeks 0 and 3), and resistance to lateral tipping force (week 3) were examined...
August 2015: American Journal of Orthodontics and Dentofacial Orthopedics
A Ramos, R J Duarte, M Mesnard
The main aim of this study was to analyze how screws affect the strain concentration induced on the mandibular condyle during implantation, screwing, and drilling, as well as after condylar loading. A clean cadaveric mandible was analyzed experimentally in the intact state and was then implanted with a Biomet/Lorenz Microfixation temporomandibular joint (TMJ) implant with seven bicortical self-tapping screws. The external surface of the mandible was instrumented with three strain gauges. A load of 500N on the TMJ was applied to the condyle before and after implantation...
November 2015: International Journal of Oral and Maxillofacial Surgery
Arjan Bins, Marjolijn A E Oomens, Paolo Boffano, Tymour Forouzanfar
PURPOSE: Intermaxillary fixation (IMF) is traditionally achieved with arch bars; however, this method has several well-known disadvantages and other techniques, such as bone screws, are available. This study evaluated current evidence regarding these IMF screws (IMFSs) for mandibular trauma and to assess whether this allows a change of treatment protocol for IMF. MATERIALS AND METHODS: A systematic electronic literature search was conducted in the PubMed, Embase, and Cochrane databases...
October 2015: Journal of Oral and Maxillofacial Surgery
Joon-Ho Yoon, Heeje Lee, Man-Yong Kim
This clinical report introduces a method for safe retrieval of a broken implant abutment screw. A reverse-tapping rotary instrument has been introduced in the market and is widely used to retrieve broken screws; however, it is difficult to use the rotary instrument unless an access hole for engagement of the rotary instrument is positioned directly on the center of the top of the broken screw remnant. Poor visibility is another limitation to make an access hole. To keep the position of the rotary instrument at the center of the broken screw, a customized drill guide was fabricated, modifying an implant impression coping with self-cured acrylic resin, all easily found in daily practice...
February 2016: Journal of Prosthodontics: Official Journal of the American College of Prosthodontists
Hiroaki Iwai, Mitsuru Motoyoshi, Yasuki Uchida, Miho Matsuoka, Noriyoshi Shimizu
INTRODUCTION: We evaluated the effects of screw placement angle on the frequency of root contact and the effects of root contact on screw stability, comparing self-drilling and self-tapping methods. METHODS: In total, 80 patients with 142 screws (diameter, 1.6 mm; length, 8.0 mm) were included. Cone-beam computed tomography images were taken. Cortical bone thickness, interroot distance, shortest distance between the screw and adjacent tooth root, and screw placement angle were measured...
April 2015: American Journal of Orthodontics and Dentofacial Orthopedics
Merve Goymen, Eren Isman, Lale Taner, Mehmet Kurkcu
OBJECTIVE: The purpose of this study was to evaluate the effects of different laser dose and force levels on the stability of orthodontic mini screws used for anchorage, by histomorphometric analyses. BACKGROUND DATA: Low-level laser therapy speeds up blood flow, improves the mechanism of the revitalization processes, reduces the risk of infection, boosts metabolic activities, and accelerates the healing of the damaged tissue. Although there are many research studies about low-level laser therapy applications in a variety of areas, no investigations were found concerning mini screw stability using various laser dose levels with different force level applications...
January 2015: Photomedicine and Laser Surgery
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