Comparison of Dental Surface Image Registration and Fiducial Marker Registration: An In Vivo Accuracy Study of Static Computer-Assisted Implant Surgery

This study compared the accuracy of static computer-assisted implant surgery (sCAIS) planned through dental surface image registration and fiducial marker registration. Stone models of 30 patients were converted into digital dental casts by using a desktop scanner. Cone-beam computed tomography (CBCT) was performed and superimposed to the digital dental casts with two methods: matching the dental surface images or matching the fiducial markers on a stereolithographic radiographic template. Following the implant planning, stereolithographic surgical guides were fabricated, and 56 fully guided implants were inserted by the same doctor. Deviations between planned and inserted implants were measured and compared using postoperative CBCT images. After adjustment for other potential influencing factors, compared with the fiducial marker registration group, significantly larger mean lateral deviations were noted in the dental surface registration group at both the implant platform and apex (p = 0.0188 and 0.0371, respectively). However, the mean lateral deviations for the dental surface registration (0.83 ± 0.51 mm at implant platform and 1.24 ± 0.68 mm at implant apex) were comparable to the literature. In conclusion, our findings indicate that although sCAIS planned using dental surface image registration was not statistically as accurate as that using fiducial marker registration, its accuracy was satisfactory for clinical use.

Download Full-text

Fully Digital Workflow for Planning Static Guided Implant Surgery: A Prospective Accuracy Study

Journal of Clinical Medicine ◽

10.3390/jcm9040980 ◽

2020 ◽

Vol 9 (4) ◽

pp. 980 ◽

Cited By ~ 1

Author(s):

Chia-Cheng Lin ◽

Ching-Zong Wu ◽

Mao-Suan Huang ◽

Chiung-Fang Huang ◽

Hsin-Chung Cheng ◽

...

Keyword(s):

Fiducial Marker ◽

Surface Registration ◽

Digital Data ◽

Angular Deviation ◽

Digital Workflow ◽

Implant Surgery ◽

Surgical Guides ◽

Digital Planning ◽

Clinical Accuracy ◽

Edentulous Patients

The accuracy of static guided implant surgery (sGIS) using conventional planning workflow has been extensively examined; however, more information is required to justify the application of fully digital planning protocol. The purpose of this study was to investigate the clinical accuracy of sGIS with a fully digital planning workflow. Twenty-one partially edentulous patients were enrolled in this prospective study. Cone-beam computed tomography (CBCT) and intraoral scans were taken and superimposed by matching the dental surface images directly (surface registration protocol) or by matching fiducial markers on a stereolithographic (SLA) radiographic template fabricated from the digital data of the intraoral scan (fiducial marker registration protocol). Virtual implant treatment plans were then determined, and tooth-supported SLA surgical guides were fabricated according to the plans. Twenty-six implant surgeries were performed via the surgical guide by one surgeon. Pre- and post-operative CBCT images were superimposed, and the positional and angular deviations between placed and planned implants were measured with metrology software. A total of 43 fully guided implants were placed, in which 25 implants were planned with the surface registration protocol. Implants planned based on the surface registration protocol had a larger mean angular deviation than the fiducial marker registration protocol. No significant differences were found for any deviations of the examined variables. Within the limits of this study, we concluded that the clinical accuracy of the sGIS planned with a fully digital workflow was consistent with the conventional workflow for partially edentulous patients.

Download Full-text

A New Twist on Surgical Guides

Journal of Oral Implantology ◽

10.1563/1548-1336-34.6.325 ◽

2008 ◽

Vol 34 (6) ◽

pp. 325-329 ◽

Cited By ~ 1

Author(s):

Trevor Bavar

Keyword(s):

Computer Assisted ◽

Implant Surgery ◽

Surgical Guide ◽

Time Of Surgery ◽

Surgical Guides ◽

Rotational Position ◽

Computer Assisted Tomography ◽

Ct Technology

Abstract Surgical guides have evolved to the point that they can be created with the aid of computer-assisted tomography (CT) technology. Surgical guides also are used in construction of the prosthesis prior to implant surgery. With existing guide techniques, the prosthesis is screw retained, or cone-shaped temporary abutments may be used to overcome the lack of parallelism of the implants. With the New Twist technique, we are able to create the surgical guide in such a way that optimum bone may be used and the rotational position of the implant may be established for the surgeon and for the laboratory. Custom abutments are inserted at the time of surgery, as is an esthetic, functionally provisional cemented prosthesis. Castings for the finished ceramo-metal bridge are fabricated before surgery is performed. The final prosthesis then is easily constructed by the restorative dentist during just 3 simple patient visits.

Download Full-text

Three-dimensional joit kinematics using bone surface registration: A computer assisted approach with an application to the wrist joint in vivo

Medical Image Computing and Computer-Assisted Intervention — MICCAI’98 - Lecture Notes in Computer Science ◽

10.1007/bfb0056256 ◽

1998 ◽

pp. 696-699 ◽

Cited By ~ 3

Author(s):

Joseph J. Crisco ◽

Robert D. McGovern ◽

Scott W. Wolfe

Keyword(s):

Wrist Joint ◽

Three Dimensional ◽

Surface Registration ◽

Computer Assisted ◽

Bone Surface

Download Full-text

Cardiovascular Effects of Micromeria graeca (L.) Benth. ex Rchb in Normotensive and Hypertensive Rats

Endocrine Metabolic & Immune Disorders - Drug Targets ◽

10.2174/1871530319666191206163136 ◽

2020 ◽

Vol 20 (8) ◽

pp. 1253-1261

Author(s):

Mourad Akdad ◽

Mohamed Eddouks

Keyword(s):

Blood Pressure ◽

Cardiovascular System ◽

Arterial Blood Pressure ◽

Antihypertensive Activity ◽

Computer Assisted ◽

Hypertensive Rats ◽

Vasorelaxant Effect ◽

Arterial Blood

Aims: The present study was performed in order to analyze the antihypertensive activity of Micromeria graeca (L.) Benth. ex Rchb. Background: Micromeria graeca (L.) Benth. ex Rchb is an aromatic and medicinal plant belonging to the Lamiaceae family. This herb is used to treat various pathologies such as cardiovascular disorders. Meanwhile, its pharmacological effects on the cardiovascular system have not been studied. Objective: The present study aimed to evaluate the effect of aqueous extract of aerial parts of Micromeria graeca (AEMG) on the cardiovascular system in normotensive and hypertensive rats. Methods: In this study, the cardiovascular effect of AEMG was evaluated using in vivo and in vitro investigations. In order to assess the acute effect of AEMG on the cardiovascular system, anesthetized L-NAME-hypertensive and normotensive rats received AEMG (100 mg/kg) orally and arterial blood pressure parameters were monitored during six hours. In the sub-chronic study, rats were orally treated for one week, followed by blood pressure assessment during one week of treatment. Blood pressure was measured using a tail-cuff and a computer-assisted monitoring device. In the second experiment, isolated rat aortic ring pre-contracted with Epinephrine (EP) or KCl was used to assess the vasorelaxant effect of AEMG. Results: Oral administration of AEMG (100 mg/kg) provoked a decrease of arterial blood pressure parameters in hypertensive rats. In addition, AEMG induced a vasorelaxant effect in thoracic aortic rings pre-contracted with EP (10 μM) or KCl (80 mM). This effect was attenuated in the presence of propranolol and methylene blue. While in the presence of glibenclamide, L-NAME, nifedipine or Indomethacin, the vasorelaxant effect was not affected. Conclusion: This study showed that Micromeria graeca possesses a potent antihypertensive effect and relaxes the vascular smooth muscle through β-adrenergic and cGMP pathways.

Download Full-text

Accuracy of Guided Implant Surgery in the Edentulous Jaw Using Desktop 3D-Printed Mucosal Supported Guides

Journal of Clinical Medicine ◽

10.3390/jcm10030391 ◽

2021 ◽

Vol 10 (3) ◽

pp. 391

Author(s):

Rani D’haese ◽

Tom Vrombaut ◽

Geert Hommez ◽

Hugo De Bruyn ◽

Stefan Vandeweghe

Keyword(s):

In Vitro Study ◽

Angular Deviation ◽

Implant Surgery ◽

Implant Position ◽

Surgical Guides ◽

Negative Effect ◽

Bone Level ◽

3D Printed ◽

Implant Alignment

Purpose: The aim of this in vitro study is to evaluate the accuracy of implant position using mucosal supported surgical guides, produced by a desktop 3D printer. Methods: Ninety implants (Bone Level Roxolid, 4.1 mm × 10 mm, Straumann, Villerat, Switzerland) were placed in fifteen mandibular casts (Bonemodels, Castellón de la Plana, Spain). A mucosa-supported guide was designed and printed for each of the fifteen casts. After placement of the implants, the location was assessed by scanning the cast and scan bodies with an intra-oral scanner (Primescan®, Dentsply Sirona, York, PA, USA). Two comparisons were performed: one with the mucosa as a reference, and one where only the implants were aligned. Angular, coronal and apical deviations were measured. Results: The mean implant angular deviation for tissue and implant alignment were 3.25° (SD 1.69°) and 2.39° (SD 1.42°) respectively, the coronal deviation 0.82 mm (SD 0.43 mm) and 0.45 mm (SD 0.31 mm) and the apical deviation 0.99 mm (SD 0.45 mm) and 0.71 mm (SD 0.43 mm). All three variables were significantly different between the tissue and implant alignment (p < 0.001). Conclusion: Based on the results of this study, we conclude that guided implant surgery using desktop 3D printed mucosa-supported guides has a clinically acceptable level of accuracy. The resilience of the mucosa has a negative effect on the guide stability and increases the deviation in implant position.

Download Full-text

Frameless robotic stereotactic biopsies: a consecutive series of 100 cases

Journal of Neurosurgery ◽

10.3171/2014.9.jns14107 ◽

2015 ◽

Vol 122 (2) ◽

pp. 342-352 ◽

Cited By ~ 49

Author(s):

Michel Lefranc ◽

Cyrille Capel ◽

Anne-Sophie Pruvot-Occean ◽

Anthony Fichten ◽

Christine Desenclos ◽

...

Keyword(s):

Stereotactic Biopsy ◽

Clinical Symptoms ◽

Diagnostic Yield ◽

Ct Scanning ◽

Fiducial Marker ◽

Surface Registration ◽

Histological Diagnosis ◽

Consecutive Series ◽

Mortality And Morbidity ◽

Stereotactic Biopsies

OBJECT Stereotactic biopsy procedures are an everyday part of neurosurgery. The procedure provides an accurate histological diagnosis with the least possible morbidity. Robotic stereotactic biopsy needs to be an accurate, safe, frameless, and rapid technique. This article reports the clinical results of a series of 100 frameless robotic biopsies using a Medtech ROSA device. METHODS The authors retrospectively analyzed their first 100 frameless stereotactic biopsies performed with the robotic ROSA device: 84 biopsies were performed by frameless robotic surface registration, 7 were performed by robotic bone fiducial marker registration, and 9 were performed by scalp fiducial marker registration. Intraoperative flat-panel CT scanning was performed concomitantly in 25 cases. The operative details of the robotic biopsies, the diagnostic yield, and mortality and morbidity data observed in this series are reported. RESULTS A histological diagnosis was established in 97 patients. No deaths or permanent morbidity related to surgery were observed. Six patients experienced transient neurological worsening. Six cases of bleeding within the lesion or along the biopsy trajectory were observed on postoperative CT scans but were associated with transient clinical symptoms in only 2 cases. Stereotactic surgery was performed with patients in the supine position in 93 cases and in the prone position in 7 cases. The use of fiducial markers was reserved for posterior fossa biopsy via a transcerebellar approach, via an occipital approach, or for pediatric biopsy. CONCLUSIONS ROSA frameless stereotactic biopsies appear to be accurate and safe robotized frameless procedures.

Download Full-text

In-house 3D-printed surgical guides for osseous lesions of the lower jaw: an experimental study

European Journal of Medical Research ◽

10.1186/s40001-021-00495-w ◽

2021 ◽

Vol 26 (1) ◽

Author(s):

Lukas Postl ◽

Thomas Mücke ◽

Stefan Hunger ◽

Oliver Bissinger ◽

Michael Malek ◽

...

Keyword(s):

Control Group ◽

Head Model ◽

Computer Assisted ◽

3D Printer ◽

Surgical Guide ◽

Surgical Guides ◽

Lower Jaw ◽

Bony Lesion ◽

3D Printed ◽

Phantom Head

Abstract Background The accuracy of computer-assisted biopsies at the lower jaw was compared to the accuracy of freehand biopsies. Methods Patients with a bony lesion of the lower jaw with an indication for biopsy were prospectively enrolled. Two customized bone models per patient were produced using a 3D printer. The models of the lower jaw were fitted into a phantom head model to simulate operation room conditions. Biopsies for the study group were taken by means of surgical guides and freehand biopsies were performed for the control group. Results The deviation of the biopsy axes from the planning was significantly less when using templates. It turned out to be 1.3 ± 0.6 mm for the biopsies with a surgical guide and 3.9 ± 1.1 mm for the freehand biopsies. Conclusions Surgical guides allow significantly higher accuracy of biopsies. The preliminary results are promising, but clinical evaluation is necessary.

Download Full-text

In Vivo Tooth-Supported Implant Surgical Guides Fabricated With Desktop Stereolithographic Printers: Fully Guided Surgery Is More Accurate Than Partially Guided Surgery

Journal of Oral and Maxillofacial Surgery ◽

10.1016/j.joms.2018.02.010 ◽

2018 ◽

Vol 76 (7) ◽

pp. 1431-1439 ◽

Cited By ~ 25

Author(s):

Sompop Bencharit ◽

Adam Staffen ◽

Matthew Yeung ◽

Daniel Whitley ◽

Daniel M. Laskin ◽

...

Keyword(s):

Guided Surgery ◽

Surgical Guides

Download Full-text

Local delivery of soluble platelet collagen receptor glycoprotein VI inhibits thrombus formation in vivo

Thrombosis and Haemostasis ◽

10.1160/th05-11-0731 ◽

2006 ◽

Vol 95 (05) ◽

pp. 763-766 ◽

Cited By ~ 31

Author(s):

Andreas Bültmann ◽

Christian Herdeg ◽

Zhongmin Li ◽

Götz Münch ◽

Christine Baumgartner ◽

...

Keyword(s):

Carotid Artery ◽

Vascular Injury ◽

Carotid Arteries ◽

Thrombus Formation ◽

Critical Role ◽

Local Delivery ◽

Computer Assisted ◽

Glycoprotein Vi ◽

Collagen Receptor

SummaryPlatelet-mediated thrombus formation at the site of vascular injury isa major trigger for thrombo-ischemic complications after coronary interventions. The platelet collagen receptor glycoprotein VI (GPVI) plays a critical role in the initiation of arterial thrombus formation. Endothelial denudation of the right carotid artery in rabbits was induced through balloon injury. Subsequently, local delivery of soluble, dimeric fusion protein of GPVI (GPVI-Fc) (n=7) or control Fc (n=7) at the site of vascular injury was performed with a modified double-balloon drugdelivery catheter.Thrombus area within the injured carotid artery was quantified using a computer-assisted image analysis and was used as index of thrombus formation.The extent of thrombus formation was significantly reduced in GPVI-Fc- compared with control Fc-treated carotid arteries (relative thrombus area, GPVI-Fc vs. Fc: 9.3 ± 4.2 vs. 2.3 ± 1.7, p<0.001). Local delivery of soluble GPVI resulted in reduced thrombus formation after catheter-induced vascular injury.These data suggest a selective pharmacological modulation of GPVI-collagen interactions to be important for controlling onset and progression of pathological arterial thrombosis, predominantly or even exclusively at sites of injured carotid arteries in the absence of systemic platelet therapy.

Download Full-text