Distal Free End Research Articles

The influence of guide stabilizers and their application sequences on trueness and precision of surgical guides in free end situations: An invitro analysis.

To evaluate the impact of guide stabilizers and their application sequences on implant placement accuracy of guided implant surgery in multiple teeth loss at free end. In this study, 96 implants were placed in the regions of #34, #36, and #37 of 32 identical mandibular models. The influence of using guide stabilizers or not (group A and group B) and various guide stabilizers application sequences (group B: #34 → #36 → #37; group C: #36 → #34 → #37; group D: #37 → #34 → #36) on implant placement trueness and precision was investigated. Data were analyzed using T-tests and one-way ANOVA. Group B showed significant benefits in enhancing implant placement precision. Compared to group A, it resulted in reducing 3D-deviation at crest and 2D deviation in vestibular-oral direction at both crest and apex. Furthermore, group D demonstrated greater improvement in global implant placement precision by reducing 2D deviation in mesial-distal direction at both crest and apex. Among the three different stabilizer application sequences, group D exhibited the highest level of implant placement precision. In cases of missing teeth at distal free end, the use of guide stabilizers and their application sequences does not have a significant impact on implant placement trueness. However, they do improve implant placement precision compared to methods that do not utilize guide stabilizers. Specifically, applying a guide stabilizer first at the furthest implant site to change teeth loss classification from free end to edentulous space with posterior support is the most reliable sequence.

Modified Unipolar Latissimus Transfer to Restore Elbow Flexion in Musculocutaneous Nerve Palsy

Modified Unipolar Latissimus Transfer to Restore Elbow Flexion in Musculocutaneous Nerve Palsy

Vertical Guided Bone Regeneration for a Single Missing Tooth Span with Titanium-Reinforced d-PTFE Membranes: Clinical Considerations and Observations of 10 Consecutive Cases with up to 36 Months Follow-up.

Vertical guided bone regeneration (GBR) using titanium-reinforced polytetrafluoroethylene (PTFE) membranes is a well-established technique and is considered technique sensitive. When using PTFE membranes, complications usually arise in the crestal incision or next to the neighboring tooth of the treated span. Most studies available describe either distal free end or multiple missing teeth span situations. Treating a single missing tooth span combines the challenge of two neighboring teeth and a smaller flap, which is more difficult to adapt to the augmented environment. This article describes 10 single span cases treated with vertical GBR using high-density PTFE membranes, highlighting clinical guidelines for preoperative care, flap design, and suturing.

3-D Printed Bite Registration Jigs for Distal Free End Implant Restorations

3-D Printed Bite Registration Jigs for Distal Free End Implant Restorations

Surgical time for graft preparation using different suture techniques.

The purpose of the present study was to compare the operative time for graft preparation using different techniques for graft suturing. Flexor profundus tendons were harvested from fresh pig hind-leg trotters. Three different suture techniques were investigated: the Krackow stitch (K), the Whipstitch (W), and the Modified Finger-Trap suture (MFT). Tendons were sutured starting at 10 mm from the distal free end of the tendon. The suture configurations of the Krackow stitch and Whipstitch were completed with five suture throws. According to the MFT technique, the suture was wrapped five times around the tendon over a distance of 30 mm. The time required to perform a complete suture on each tendon was measured. Five independent examiners of different levels of training measured the time required for graft preparation during 3 separate occasions to determine intraobserver repeatability and interobserver reproducibility. The mean time required for graft preparation following the Krackow technique was 69.1 seconds ± 18.3 SD (range 31.8-120). The Whipstitch technique took an average of 59.9 seconds ± 21.2 SD (range 27-93). The MFT suture required a mean of 29.3 seconds ± 11.4 SD for completing the suture (range 21.6-33). In all examiners the time required to complete the MFT suture was significantly less than the other suture techniques (p < 0.05). Intraobserver intraclass correlation coefficients for each examiner ranged from 0.72 to 0.83. Low graft preparation time is required to complete a MFT suture in a porcine tendon model. Further, time required for graft preparation using the MFT was shorter than other suturing techniques such as the Krackow and Whipstitch techniques. The MFT suture could be used for graft set-up with the main advantage of reducing the time required in comparison with other suture techniques.

Transient pearling and vesiculation of membrane tubes under osmotic gradients

We report the experimental observation of osmotically induced transient pearling instabilities in vesicular membranes. Giant phospholipid vesicles subjected to negative osmotic gradient, which drives the influx of water in to the vesicular interior, produces transient cylindrical protrusions. These protrusions exhibit a remarkable pearling intermediate, which facilitates their subsequent retraction. The pearling front propagates from the distal free end of the protrusion toward the vesicular source and accompanies gradual shortening of the protrusion via pearl-pearl coalescence. Real-time introduction of a positive osmotic gradient, on the other hand, drives vigorous shape fluctuations, which in turn produce cylindrical, prolate- and pear-shaped intermediates presumably due to an increased vesicular area relative to the encapsulated volume. These intermediates transiently produce a pearled state prior to their fission. In both cases, the transient pearling state gives rise to an array of stable spherical daughter vesicles, which may be connected to one another by fine tethers not resolved in our experiments. These results may have implications for self-reproduction in primitive, protein-free, cells.

Mastication force analysis on the fulcrum point of first class lever on lower jaw distal free end denture

The problem in first-class free end lever (distal extension base) Removable Partial Denture (RPD) is the lever force on the retention point that may harm the abutment tooth which has been discussed many times, but the amount of force on the fulcrum point (rest) on the abutment tooth has never discussed yet. The objective of this paper is to analyze the amount of force on the fulcrum point in the first class lever of lower free end denture on the two dimension static models. The analysis result reveals that the force on the fulcrum point is bigger than the mastication force on the free end saddle, or the force on the fulcrum point is equal to the sum of the force of the saddle and the force on the retention point. The force on the fulcrum point may cause trauma to the periodontal tissue of the abutment tooth. To decrease the amount of force on the fulcrum point is by mastication force limitation, decreasing the distance between the mastication point and the fulcrum point; and increasing the distance between retention point and fulcrum point. For clinical application, there are many biological variables to be considered.

Modèle animal d'entraînement à l'anastomose temporosylvienne

Background and purpose Microsurgical training in neurosurgery is essential, the aim being to practise surgery with the microscope and to learn vascular and nervous anastomosis techniques. The objective of this project was to create a model simulating the human anatomy and surgical conditions. Technique Rats were operated on using a plaster model mimicking a human hemicranium. The technique performed was an end to side anastomosis of the distal free end of the left carotid to the right carotid arteriotomy, using eight interrupted 10/0 sutures, at a depth of 5 cm. Early and delayed patency tests were performed. Discussion Various models and techniques for training to microsurgical arterial anastomosis are described in the literature. The determining factor is the skill of the operator, which is in turn dependent on the level of training. This model allows the surgeon to gain significant technical experience with the EC-IC bypass, which is applicable to human neurosurgical practice and is indispensable for the prospective neurovascular surgeon.

Hazardous Course of an End-tidal Carbon Dioxide Catheter in a Premature Infant

Hazardous Course of an End-tidal Carbon Dioxide Catheter in a Premature Infant

“Elephant Trunk” Mimicking Thoracic Aortic Dissection

HomeCirculationVol. 115, No. 19“Elephant Trunk” Mimicking Thoracic Aortic Dissection Free AccessReview ArticlePDF/EPUBAboutView PDFView EPUBSections ToolsAdd to favoritesDownload citationsTrack citationsPermissions ShareShare onFacebookTwitterLinked InMendeleyReddit Jump toFree AccessReview ArticlePDF/EPUB“Elephant Trunk” Mimicking Thoracic Aortic DissectionThe Role of Intravascular Ultrasound Mario Zanchetta, MD, Diego Calzolari, MD, Luigi Pedon, MD, Francesca Faresin, MD and Salvatore Ronsivalle, MD Mario ZanchettaMario Zanchetta From the Department of Cardiovascular Disease, Cittadella, Padua, Italy. Search for more papers by this author , Diego CalzolariDiego Calzolari From the Department of Cardiovascular Disease, Cittadella, Padua, Italy. Search for more papers by this author , Luigi PedonLuigi Pedon From the Department of Cardiovascular Disease, Cittadella, Padua, Italy. Search for more papers by this author , Francesca FaresinFrancesca Faresin From the Department of Cardiovascular Disease, Cittadella, Padua, Italy. Search for more papers by this author and Salvatore RonsivalleSalvatore Ronsivalle From the Department of Cardiovascular Disease, Cittadella, Padua, Italy. Search for more papers by this author Originally published15 May 2007https://doi.org/10.1161/CIRCULATIONAHA.106.683946Circulation. 2007;115:e455–e456A 68-year-old woman, with a history of hypertension and extensive aortic aneurysm associated with severe aortic valvular regurgitation, underwent aortic valve and ascending aorta replacement (Prisma Plus Stentless, 23 mm, Model 2500P, Edwards Life Sciences, Horw, Switzerland) and separate graft replacement of the aortic arch (vascular prosthesis, 8 mm, Gelweave Vascutek, Inchinnan, Scotland, UK) with the “elephant trunk” technique (Gelweave Vascuteck vascular prothesis, 24 mm).Five months later, she was admitted to our emergency room because of stenocardia and severe upper abdominal pain with dizziness. A contrast-enhanced computed tomography scan showed a suspicious image of a membrane-like structure resembling a dissection flap in the anterolateral aspect of the descending thoracic aorta (Figure, A) close to the distal free end of the elephant trunk. The descending thoracic and abdominal aortas were of normal diameter, with no signs of dissection at any level. Download figureDownload PowerPointA, Axial contrast-enhanced computed tomography scan shows a membrane-like structure (arrow) in the descending aorta, simulating an intimal flap close to the distal free end of the elephant trunk. B, Right anterior, oblique-view aortogram reveals a mimicking localized spiral dissection (arrows) parallel to the aortic wall. C, Intravascular ultrasound at the distal free end of vascular prosthesis shows its incomplete, asymmetric expansion, resulting in a very complex, bizarre (spade-shaped) new lumen. An almost circumferential echo-free space (arrow) between the vascular prosthesis and aortic vessel wall can be appreciated; it is responsible for corresponding computed tomography and angiographic ambiguous findings. D) Right anterior, oblique-view aortogram after secondary elephant trunk fixation, with 7 cm of overlap of the endovascular stent graft into the free-floating elephant trunk. E) Intravascular ultrasound at the same level of Figure 1C reveals perfect stent-graft expansion and geometry, with complete adherence to the aortic vessel wall. F) Oblique, sagittal, contrast-enhanced computed tomography scan imaging at follow-up of the composite graft.The patient was referred to our institution for angiography to further explore the diagnosis of aortic dissection. Thoracic aortogram was not conclusive, revealing a mimicking localized intimal tear parallel to the aortic wall, without a mobile intimal flap (Figure, B). To further characterize these findings, an intravascular ultrasound examination was performed, using a 9-French, 9-MHz, Ultra ICE catheter (EP Technologies, Boston Scientific Corp, San Jose, Calif). During a manual pullback from the level of the left subclavian artery origin to the diaphragmatic hiatus, the inner aortic lumen and wall were examined. The equivocal computed tomography and angiographic images close to the distal free end of the elephant trunk were reinterpreted as an incomplete, asymmetric expansion of the vascular prosthesis, with enhanced blood within the graft lumen and outside the graft wall but within the lumen of the native aorta (Figure, C). Secondary elephant trunk fixation by endovascular stent grafting (Valiant Thoracic Stent Graft 32×150, Medtronic Vascular, Santa Rosa, Calif) was performed under fluoroscopic guidance (Figure, D); this was followed by a repeated intravascular ultrasound examination, which showed complete expansion of the skeletonized elephant trunk on the aortic wall (Figure, E). No neurological deficit occurred, and follow-up computed tomography scan confirmed the absence of endoleaks (Figure, F).Familiarity with these images, coupled with detailed knowledge of surgical technique, is essential for accurately evaluating postoperative findings and avoiding misdiagnosis.DisclosuresNone.FootnotesCorrespondence to Mario Zanchetta, MD, FACA, FSCAI, FESC, Dipartimento di Malattie Cardiovascolari, Ospedale Civile, Via Riva Ospedale, 35013, Cittadella, Padova, Italy. E-mail [email protected] Previous Back to top Next FiguresReferencesRelatedDetailsCited By Erz G, Mangold S, Franzen E, Claussen C, Niess A, Burgstahler C and Kramer U (2012) Correlation between ECG abnormalities and cardiac parameters in highly trained asymptomatic male endurance athletes: evaluation using cardiac magnetic resonance imaging, The International Journal of Cardiovascular Imaging, 10.1007/s10554-012-0082-9, 29:2, (325-334), Online publication date: 1-Feb-2013. May 15, 2007Vol 115, Issue 19 Advertisement Article InformationMetrics https://doi.org/10.1161/CIRCULATIONAHA.106.683946PMID: 17502580 Originally publishedMay 15, 2007 PDF download Advertisement SubjectsCardiovascular SurgeryComputerized Tomography (CT)Imaging

Implant-Supported Fixed Prostheses for the rehabilitation of distal free end in periodontally compromised dentitions Number of fixtures affecting bone tissue change

Implant-Supported Fixed Prostheses for the rehabilitation of distal free end in periodontally compromised dentitions <i>Number of fixtures affecting bone tissue change</i>

Primary growth and morphological markers of interannual growth limits in Cupressaceae from Patagonia

The present study shows experimentally that primary growth of the native Patagonian Cupressaceae Austrocedrus chilensis (D. Don) Pic.-Serm et Bizz., Fitzroya cupressoides (Molina) I. M. Johnst. and Pilgerodendron uviferum (D. Don) Florin is potentially continuous. External morphological markers of interannual growth limits have been identified for the main axes of these species after several years of observation. Such limits correspond with axis portions in which internodes are relatively short and leaves have a small distal free end forming an acute angle with the axis. The causality of these results and their utility for studying the productivity, adaptation to different environments, population management and conservation of these threatened species are discussed. (Resume d'auteur)

Porobeltraniella gen. nov. to accommodate two species of Beltraniella

The genus Beltraniella Subramanian is characterized by setiform conidiophores with radially lobed basal cells, separating cells and lageniform conidia with the distal free end truncate, proximal end rostrate, with a subhyaline transverse band at equatorial zone. Beltraniella porosa and Beltraniella patilii are two species that show characteristics distinct from Beltraniella: They have sterile lateral setae arising at the conidiogenous apparatus and several equatorial pores in place of the continuous band. A new genus, Porobeltraniella, is described to accommodate them.

The use of an external-internal shunt in the treatment of extracranial internal carotid artery saccular aneurysms: technical case report

BACKGROUND Extracranial internal carotid artery aneurysms (EICAA) are rare lesions. Resection and grafting is the preferred method of management. However, the details of shunt use in surgery for this type of aneurysm has been described in few articles. We describe an external-internal shunt with intra-aneurysmal trans-orifice insertion. CASE REPORT A 55-year-old woman presented with a 5-year history of a progressively enlarging pulsatile neck mass. An examination revealed no neurological deficit. Right carotid angiogram showed a saccular EICAA involving the ICA distal to the bifurcation, with kinking of the internal carotid artery (ICA). The dome of the EICAA extended from the upper border of C4 to the midportion of C2 and the maximum diameter was 4 cm. RESULTS Using the shunt technique, we successfully removed the aneurysm and reconstructed the ICA. The end-to-end anastomosis was easy because the shunt was involved only in the distal free end of the ICA, but not in the proximal free end of the ICA. CONCLUSION This technique could be an option for the treatment of EICCA when a shunt is needed to maintain the cerebral circulation.

インプラント作業模型の精度に関する研究 第１報 ＩＭＺインプラントについて

This study surveyed and compared the change of three dimensional accuracy of working models for IMZ system. Master models were designed to simulate a clinical situation in case of mandible distal free-end and total edentulous arch. Impressions were made using a transfer coping technique with polyoxymethylene (POM) and stainless steel impression post. Five casts were made in each case. Working models were fixed on the measuring jig, using a three-dimensional measuring apparatus (ZYZAX: Tokyo seimitsu Co.) and measured. Reference points were placed on a jig, working casts of impression posts. Coordinate points were compared between the master model and working models, and the three-dimensional change of distance was claculated.The results were as follows:1. The distortion tendencies of implant working casts differed, according to the characteristics of the impression post materials.2. Stainless steel impression posts were better, with lower quantities of distortion and standard deviations than the POM posts.3. Implant position influenced the direction of impression post distortion.

Synaptonemal complex analysis in &lt;i&gt;Talpa occidentalis &lt;/i&gt;spermatocytes (Insectivora, Mammalia)

Zygotene and pachytene configurations of the X chromosome were studied in whole-mount, silver-stained preparations of spermatocytes from XY males from a population of Talpa occidentalis in which sex reversal has been described. The most striking finding in this study was a self-pairing conformation of the axial (differential) element of the X chromosome. This self-pairing was markedly constant in the site of initiation, which invariably involved the distal free end of the X and the region beyond the X-Y pairing segment, so that X-Y synapsis was never disturbed. In addition, self-pairing occurred later than autosomal synapsis and was accompanied by thickening of the axes, although this seemed to occur after the formation of an ordinary synaptonemal complex. The etiology of this phenomenon may be based on residual homology, possibly due to conservation of a primitive isochromosome throughout the karyotypic evolution of this species. However, the possible relationship between self-pairing and sex reversal remains obscure.

(1) (Psychical Research) The Goligher Circle, May to August 1921 (2) The Case against Spirit Photographs (3) Cold Light on Spiritualistic “Phenomena”: An Experiment with the Crewe Circle

(1) IN this book Dr. Fournier d'Albe records his experiments with the Goligher medium and Circle, undertaken to corroborate, if possible, the remarkable results claimed by the late Dr. Crawford. In order to explain certain alleged occult phenomena (“raps,” “levitations,” etc.) obtained with this medium, Dr. Crawford postulated as the agents invisible entities which he called “operators' and believed to be departed human beings (spirits). The modus operandi of the “operators” is as follows: From the medium's body, metamorphosed from her “flesh,” a substance, indifferently called “plasm,” “ectoplasm,” “psychic fluid,” etc., emanates as an extensible rod, the proximal end of which retains connexion with the medium's body, the distal free end being provided with a “suction grip “to hold, and move, objects. Dr. Crawford not only photographed this “psychic stuff,” but also in June 1920 saw it and felt it wriggling up the medium's legs like a snake. Shortly after this experience he committed suicide, and his researches ceased. Some ten months later Dr. Fournier d'Albe takes up the broken threads. The seance room he describes as feebly illuminated by a one candle-power gas-burner, enclosed in a box with red glass sides so arranged that the medium is in comparative darkness, the floor, the legs of the members of the Circle, and even some of their hands, being in total darkness. Kathleen Goligher, the medium, is seated at one end, so to speak, of the circle of sitters, her father being almost invariably next her. (1) (psychical Research). The Goligher Circle, May to August 1921. Experiences of Dr. E. E. Fournier d'Albe. With an Appendix containing Extracts from the Correspondence of the late Dr. W. J. Crawford; and others. Pp. 81 + plates. (London: J. M. Watkins, 21 Cecil Court, 1922.) 7s. 6d. net. (2) The Case against Spirit Photographs. By C. Vincent Patrick W. Whately Smith. Pp. 47. (London: Kegan Paul and Co., Ltd., 1922.) (3) Cold Light on Spiritualistic “Phenomena”: An Experiment with the Crewe Circle. By Harry Price. Pp. 15. (London: Kegan Paul and Co., Ltd., 1922.) 6d. net.