Root surface roughness following mechanical instrumentation in vivo and in vitro SEM study

1998 ◽  
Vol 28 (4) ◽  
pp. 809
Author(s):  
Young-Kyoo Lee
Keyword(s):  
Surface Roughness ◽  
Root Surface ◽  
Sem Study

scholarly journals Effects of Systemic Fluoride and in vitro Fluoride Treatment on Enamel Crystals

2006 ◽  
Vol 85 (11) ◽  
pp. 1042-1045 ◽  
Author(s):  
H. Chen ◽  
A. Czajka-Jakubowska ◽  
N.J. Spencer ◽  
J.F. Mansfield ◽  
C. Robinson ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Crystal Surface ◽  
Direct Action ◽  
Crystal Surfaces ◽  
Surface Restructuring ◽  
Fluoride Treatment ◽  
Enamel Crystal ◽  
Dose Dependent

Systemically administered fluoride at a concentration of 75 ppm increases the surface roughness of developing enamel crystals in rats, which may be significant in advancing our understanding of the biological mechanism of fluorosis. Thus, the aim of this study was to investigate whether the increased surface roughness may be a result of surface restructuring by the direct action of fluoride at the crystal surface. We examined the fluoride dose-dependent roughening of enamel crystal surfaces in vivo, in the rat, and whether this roughening could be mimicked by the in vitro treatment of rat enamel crystals with neutral pH fluoride solutions. Our results showed that enamel crystal surface roughness increased after treatment with increasing fluoride ion concentrations, whether applied in vitro or administered systemically. This suggests a mechanism, alongside others, for the increased surface roughness of crystals in fluorotic enamel.

Root Surface Removal With Diamond-Coated Ultrasonic Instruments: An In Vitro and SEM Study

1996 ◽  
Vol 67 (12) ◽  
pp. 1281-1287 ◽  
Author(s):  
J. Eric Lavespere ◽  
Raymond A. Yukna ◽  
David A. Rice ◽  
Denis M. LeBlanc
Keyword(s):  
Root Surface ◽  
Sem Study ◽  
Surface Removal

scholarly journals Influence of dental exposure to oral environment on smear layer removal and collagen exhibition after using different conditioning agents

2011 ◽  
Vol 22 (6) ◽  
pp. 479-485 ◽  
Author(s):  
Lucas Amaral Fontanari ◽  
Shelon Cristina Souza Pinto ◽  
Rodrigo Cavassim ◽  
Rubens Spin-Neto ◽  
Eduardo de Paula Ishi ◽  
...  
Keyword(s):  
Surface Modification ◽  
In Vitro Study ◽  
Root Surface ◽  
In Vivo Studies ◽  
Impacted Teeth ◽  
Surface Conditioning ◽  
Oral Environment ◽  
Root Surface Conditioning

Although in vitro studies have shown encouraging results for root surface conditioning with demineralizing agents, in vivo studies have failed to show its benefits in periodontal healing. This can be attributed to several factors, among which, the hypermineralization of dental surface. Therefore, this in vitro study compared, using scanning electron microscopy (SEM), the effect of root surface conditioning with different conditioners (1% and 25% citric acid, 24% EDTA and 50 mg/mL tetracycline hydrochloride) in impacted teeth and in teeth that had their roots exposed to the oral environment. One trained examiner assessed the SEM micrographs using a root surface modification index. There was a tendency of more root surface modification in the group of impacted teeth, suggesting that the degree of root mineralization influences its chemical demineralization.

scholarly journals Defining surfaces : Implant topography – a review (Preprint)

2018 ◽  
Author(s):  
Preeti Satheesh Kumar ◽  
Vyoma Venkatesh Grandhi ◽  
Vrinda Gupta
Keyword(s):  
Surface Roughness ◽  
Surface Topography ◽  
Dental Implants ◽  
Sol Gel ◽  
Implant Surface ◽  
Research Publications ◽  
Bone To Implant Contact ◽  
Titanium Dental Implants

BACKGROUND . A variety of claims are made regarding the effects of surface topography on implant osseointegration. The development of implant surfaces topography has been empirical, requiring numerous in vitro and in vivo tests. Most of these tests were not standardized, using different surfaces, cell populations or animal models. The exact role of surface chemistry and topography on the early events of the osseointegration of dental implants remain poorly understood. OBJECTIVE This review considers the major claims made concerning the effects of titanium implant surface topography on osseointegration. The osseointegration rate of titanium dental implants is related to their composition and surface roughness. The different methods used for increasing surface roughness or applying osteoconductive coatings to titanium dental implants are reviewed. Important findings of consensus are highlighted, and existing controversies are revealed. METHODS This review considers many of the research publications listed in MEDLINE and presented in biomedical research publications and textbooks. Surface treatments, such as titanium plasma-spraying, grit-blasting acid-etching,alkaline etching, anodization,polymer demixing ,sol gel conversion and their corresponding surface morphologies and properties are described. RESULTS Many in vitro evaluations are not predictive of or correlated with in vivo outcomes. In some culture models, increased surface topography positively affects pro-osteogenic cellular activities. Many studies reveal increase in bone-to-implant contact,with increased surface topography modifications on implant surfaces. CONCLUSIONS Increased implant surface topography improves the bone-to-implant contact and the mechanical properties of the enhanced interface.

scholarly journals Histological Evaluation of Endothelial Reactions after Endovascular Coil Embolization for Intracranial Aneurysm

2003 ◽  
Vol 9 (1_suppl) ◽  
pp. 69-82 ◽  
Author(s):  
T. Ozawa ◽  
S. Tamatani ◽  
T. Koike ◽  
H. Abe ◽  
Y. Ito ◽  
...  
Keyword(s):  
Endothelial Cells ◽  
Endothelial Cell ◽  
Coil Embolization ◽  
Carotid Arteries ◽  
Sem Study ◽  
Endovascular Coil Embolization ◽  
Platinum Coils

The purpose of this study was to evaluate the role of the endothelial cell reaction after endovascular coil embolization for the treatment of intracranial aneurysms. A scanning electron microscopic (SEM) study of the platinum coil, embolized into a middle cerebral aneurysm in a 35-year-old woman and subsequently removed surgically eight months later, revealed no endothelial coverage on the coil. This finding prompted us to perform experimental studies. In the first in vitro study, endothelial cells from gerbil brain microvessels and canine carotid arteries were co-cultured with either bare-form platinum coils or type-1 collagen-coated coils for up to three weeks, and the endothelial cell population on the coils was ascertained. In the second in vivo study, platinum coils coated with type-1 collagen were delivered endovascularly into canine carotid arteries, while the contralateral side was treated with bare-form coils, and endothelialization over the coil was investigated. SEM studies revealed that no endothelial cells, either from gerbil brain microvessels or from canine carotid artery, were found on the uncoated coils, whereas gerbil endothelial cells began to proliferate on the collagen-coated coils in three days, covering extensively in one week and reaching confluence in two weeks in vitro. The in vivo canine study demonstrated that bare-form platinum coils did not show endothelial coverage until two weeks, but endothelial cells proliferated directly on the collagen-coated coils in three days, and coils were completely covered in two weeks. These results supported the SEM study of our case and several human histopathological reports in the literature in that endothelial cell coverage in the orifice of the intracranial aneurysm is exceptional after endovascular treatment. But if some extracellular matrix, like collagen in our study, is prepared, coverage could be possible, as is seen in a few human cases. Biological modification of the platinum coils, such as collagen coating, is awaited for the better long-term results of endovascular coil embolization without recanalization of the treated intracranial aneurysms.

scholarly journals Comparative in vitro study of root roughness after instrumentation with ultrasonic and diamond tip sonic scaler

2006 ◽  
Vol 14 (2) ◽  
pp. 124-129 ◽  
Author(s):  
Fernanda Vieira Ribeiro ◽  
Renato Correa Viana Casarin ◽  
Francisco Humberto Nociti Júnior ◽  
Enilson Antônio Sallum ◽  
Antonio Wilson Sallum ◽  
...  
Keyword(s):  
Surface Roughness ◽  
In Vitro Study ◽  
Root Surface ◽  
Control Group ◽  
Human Teeth ◽  
Treatment Groups ◽  
Before And After ◽  
Root Surfaces ◽  
Scanning Electron

OBJECTIVE: The purpose of this study was to evaluate the root surface roughness after instrumentation with hand curette and diamond-coated sonic and universal ultrasonic tips. MATERIALS AND METHODS: Forty root surfaces of human teeth were randomly assigned to four treatment groups: control group (without instrumentation), curette instrumentation, ultrasonic instrumentation with universal tip and sonic instrumentation with diamond-coated tip. Each sample was instrumented with fifteen strokes. Before and after instrumentation, surface roughness was measured. In addition, the root surface topography was examined after treatment under the scanning electron microscope. RESULTS: Significant statistical differences (p <0.05) were observed when comparing the control group (0.48±0.07mm) to the treated groups (hand - 1.246±0.279mm, ultrasonic - 1.468±0.177mm and sonic instrumentation - 1.576±0.20mm). The highest roughness was produced by diamond-coated sonic tip and by ultrasonic universal tip (p >0.05). CONCLUSION: The diamond-coated tip with sonic scaler instrumentation and ultrasonic instrumentation produce similar root surface roughness, higher than curette instrumentation.

scholarly journals Early detection of enamel demineralization by optical coherence tomography

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Meng-Tsan Tsai ◽  
Yen-Li Wang ◽  
Ting-Wei Yeh ◽  
Hsiang-Chieh Lee ◽  
Wen-Ju Chen ◽  
...  
Keyword(s):  
Surface Roughness ◽  
Optical Coherence Tomography ◽  
Early Stage ◽  
Scattering Coefficient ◽  
Tooth Surface ◽  
Acidic Environment ◽  
Optical Coherence ◽  
Tooth Demineralization

AbstractEnamel is the outermost layer of the tooth that protects it from invasion. In general, an acidic environment accelerates tooth demineralization, leading to the formation of cavities. Scanning electron microscopy (SEM) is conventionally used as an in vitro tool for the observation of tooth morphology changes with acid attacks. Yet, SEM has intrinsic limitations for the potential application of in vivo detection in the early demineralization process. In this study, a high-resolution optical coherence tomography (OCT) system with the axial and transverse resolutions of 2.0 and 2.7 μm in teeth has been utilized for characterizing the effect of the acidic environment (simulated by phosphoric acid) on the enamel topology. The scattering coefficient and the surface roughness of enamel can be directly derived from the OCT results, enabling a quantitative evaluation of the topology changes with demineralization. The dynamic process induced by the acid application is also recorded and analyzed with OCT, depicting the evolution of the demineralization process on enamel. Notably, the estimated enamel scattering coefficient and surface roughness significantly increase with the application time of acid and the results illustrate that the values of both parameters after demineralization are significantly larger than those obtained before the demineralization, illustrating both parameters could be effective to differentiate the healthy and demineralized teeth and determine the severity. The obtained results unambiguously illustrate that demineralization of the tooth surface can be successfully detected by OCT and further used as an indicator of early-stage cavity formation.

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