Comparison between two methods for resin removing after bracket debonding

OBJECTIVE: The aim of this study was to assess - using scanning electron microscopy (SEM) - the effectiveness of two abrasive discs, one made from silicon and one from aluminum oxide, in removing adhesive remnants (AR) after debonding orthodontic brackets. METHODS: Ten randomly selected bovine teeth were used, i.e., 2 in the control group, and the other 8 divided into two groups, which had orthodontic brackets bonded to their surface with Concise Orthodontic Adhesive (3M). The following methods were employed - in one single step - to remove AR after debracketing: Group A, Optimize discs (TDV) and Group B, Onegloss discs (Shofu), used at low speed. After removing the AR with the aforementioned methods, the teeth were prepared to undergo SEM analysis, and photographs were taken of the enamel surface with 50x magnification. Six examiners evaluated the photographs applying the Zachrisson and Årtun enamel surface index (ESI) system (1979). RESULTS: Group A exhibited minor scratches on the enamel surface as well as some AR in some of the photographs, while Group B showed a smoother surface, little or no AR and some abrasion marks in the photographs. No statistically significant differences were found between the two methods and the control group. CONCLUSIONS: The two abrasive discs were effective in removing the AR after bracket debonding in one single step.

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In VitroAdherence of Oral Bacteria to Different Types of Tongue Piercings

The Scientific World JOURNAL ◽

10.1155/2016/7349371 ◽

2016 ◽

Vol 2016 ◽

pp. 1-6 ◽

Cited By ~ 1

Author(s):

Lucas Pereira Borges ◽

Julio Cesar Campos Ferreira-Filho ◽

Julia Medeiros Martins ◽

Caroline Vieira Alves ◽

Bianca Marques Santiago ◽

...

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Bacterial Adhesion ◽

Oral Bacteria ◽

The Other ◽

Control Group ◽

Colony Forming Units ◽

Different Types ◽

Scanning Electron

The purpose of this work was to verifyin vitroadherence ofE. corrodensandS. oralisto the surface of tongue piercings made of surgical steel, titanium, Bioplast, and Teflon. For this, 160 piercings were used for the count of Colony Forming Units (CFU) and 32 piercings for analysis under scanning electron microscopy. Of these, 96 (24 of each type) were individually incubated in 5 mL of BHI broth and 50 μL of inoculum at 37°C/24 h. The other 96 piercings formed the control group and were individually incubated in 5 mL of BHI broth at 37°C/24 h. Plates were incubated at 37°C/48 h for counting of CFU/mL and data were submitted to statistical analysis (pvalue<0.05). ForE. corrodens, difference among types of material was observed (p<0.001) and titanium and surgical steel showed lower bacterial adherence. The adherence ofS. oralisdiffered among piercings, showing lower colonization (p<0.007) in titanium and surgical steel piercings. The four types of piercings were susceptible to colonization byE. corrodensandS. oralis, and bacterial adhesion was more significant in those made of Bioplast and Teflon. The piercings presented bacterial colonies on their surface, being higher in plastic piercings probably due to their uneven and rough surface.

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SEM analysis of the acid-etched enamel patterns promoted by acidic monomers and phosphoric acids

Journal of Applied Oral Science ◽

10.1590/s1678-77572006000600008 ◽

2006 ◽

Vol 14 (6) ◽

pp. 427-435 ◽

Cited By ~ 22

Author(s):

Mirela Sanae Shinohara ◽

Marcelo Tavares de Oliveira ◽

Vinícius Di Hipólito ◽

Marcelo Giannini ◽

Mario Fernando de Goes

Keyword(s):

Phosphoric Acid ◽

Dental Enamel ◽

Sem Analysis ◽

Enamel Surface ◽

The Other ◽

Third Molars ◽

Etching Pattern ◽

Bonding Systems ◽

Scanning Electron ◽

Phosphoric Acids

ABSTRACT OBJECTIVE: Although self-etching bonding systems (SES) are indicated to prepare dental enamel for bonding, concerns have been expressed regarding their effectiveness. The aim of this study was to analyze the etching pattern (EP) of nine SES in comparison with 35% and 34% phosphoric acid etchants (FA) on intact (IN) and ground (GR) enamel surface. MATERIALS AND METHODS: Twenty-two human third molars were sectioned in mesial-distal and buccal-lingual directions, and four dental fragments were obtained from each tooth. Half of the fragments were ground using 600-grit SiC paper and the other half remained intact. The fragments were randomly assigned into 22 groups, according to the texture of enamel surface (IN and GR) and the technique to etch the enamel (34% FA, 35% FA, AdheSE primer; Brush & Bond; Clearfil Protect Bond primer; iBond; One-up Bond F; OptiBond Solo Plus primer; Tyrian SPE primer; Unifil Bond primer and Xeno III). Conditioners were applied to IN and GR enamel surfaces, according to the manufacturer's instructions. Specimens etched with phosphoric acids were washed with water, while the surfaces treated with SES were submitted to alternate rinsing with alcohol and acetone. The specimens were dried, sputter-coated and examined under a scanning electron microscope. RESULTS: For both IN and GR enamel surfaces, the EP of 34 and 35% FA was deeper and more homogeneous in comparison to EP of SES, except for Tyrian SPE. The acidic monomer action of self-etching systems was more effective on GR enamel. CONCLUSION: Most of the SES are less aggressive than phosphoric acid etchants and their etching effects were reduced on intact enamel surfaces.

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Elemental and morphological analysis of enamel following the application of two bleaching systems with amorphous calcium phosphate: effect on enamel erosion susceptibility

Bulletin of the National Research Centre ◽

10.1186/s42269-021-00527-9 ◽

2021 ◽

Vol 45 (1) ◽

Author(s):

Shaymaa M. Nagi ◽

Shahinaz H. Nabil ◽

Mohamed H. Zaazou

Keyword(s):

Calcium Phosphate ◽

Amorphous Calcium Phosphate ◽

Morphological Changes ◽

Enamel Surface ◽

Control Group ◽

Bleaching Agent ◽

Bleaching Procedure ◽

Significant Difference ◽

Group A ◽

Group B

Abstract Background Using remineralizing agents during and after bleaching procedures could maintain enamel surface, decreasing its erosive susceptibility. This study evaluated the efficacy of an in-office and at-home bleaching materials with amorphous calcium phosphate (ACP) on the susceptibility of the enamel to erosion. Forty-five bovine specimens were separated into three groups. Group A: no bleaching (control). Group B: Zoom 2 bleaching followed by ACP application. Group C: Nite White ACP. All specimens in all groups were subjected to an erosive challenge for five days. Using Energy Dispersive X-ray all specimens were subjected to elemental analysis and were examined for morphological changes under Scanning Electron Microscope (SEM). Results Group B showed the highest mean calcium, phosphorus and sodium weight percent (wt%). Both Groups B and C showed statistically significant difference. While, there was no statistically significant difference between both Groups A and B.The sodium mean wt% showed a statistically significant difference in all groups. The magnesium mean wt% showed no statistically significant difference in all groups. SEM photomicrograph revealed hollowing of prism cores with intact prisms peripheries for group A. Group B showed relativity smooth surface with minor pores, while Group C showed an increase in the depth of surface irregularities and depressions. Conclusions Enamel susceptibility to erosion after bleaching procedure was material dependent. Zoom 2 bleaching agent followed by ACP application did not increase the susceptibility of the enamel surface to erosion. Adding ACP to Nite White bleaching agent had no benefit on reducing enamel susceptibility to erosion.

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Association of Nasal Polyposis with Bronchial Asthma

Bangladesh Journal of Otorhinolaryngology ◽

10.3329/bjo.v23i1.45106 ◽

2020 ◽

Vol 23 (1) ◽

pp. 11-18

Author(s):

Md Anamul Haque ◽

Md Kamrul Hasan Tarafder ◽

ABM Luthful Kabir ◽

Mohammad Harun Or Rashid ◽

Dhiman Pramanik ◽

...

Keyword(s):

Bronchial Asthma ◽

Eosinophil Count ◽

Nasal Polyposis ◽

The Other ◽

Control Group ◽

Case Group ◽

College Hospital ◽

Other Hand ◽

Group A ◽

Group B

Objective: To find out association between Nasal polyposis and bronchial asthma. Methods: This was a cross sectional study which was carried out in the departments of Otolaryngology and Head-Neck surgery of Bangabondhu Sheikh Mujib Medical University and Dhaka Medical College Hospital during the period of February 2014 to July 2014. A Total 230 patients were selected according to selection criteria among which 30 subjects had nasal polyposis (designated as group A or cases) and 200 subjects had no nasal polyposis (designated as group B or control group). Results: In group (A), asthma was found in 30.0% cases. On the other hand, asthma was found in 2.5% of control group (B). The association of nasal polyposis with bronchial asthma was highly significant (p<.05). In both group 40.0% patients were within the 38-47 year’s age group. In case group, 80.0% patients had any sorts of allergic history on the other hand, only 15.0% patients had allergic history in control group. High eosinophil count was found 66.7% patients suffering from nasal polyposis with bronchial asthma and in comparison to patients suffering from nasal polyposis without bronchial asthma had high eosinophil count 42.85%. In group A High IgE level was found 66.7% patients suffering from nasal polyposis with bronchial asthma, on the other hand, 42.85% had IgE level among patients suffering from nasal polyposis without bronchial asthma. Conclusion: Patients with nasal polyposis and asthma are significantly associated. Both serum IgE and total circulating eosinophil count are significant associated with nasal polyposis and bronchial asthma. Bangladesh J Otorhinolaryngol; April 2017; 23(1): 11-18

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Effects of discriminate and indiscriminate use of enrofloxcin on hematological parameters

GSC Advanced Research and Reviews ◽

10.30574/gscarr.2021.7.1.0064 ◽

2021 ◽

Vol 7 (1) ◽

pp. 09-015

Author(s):

Md. Mominul Islam Bhuiyan ◽

Md. Shafiqul Islam ◽

Md. Rakibul Hasan ◽

Kazi Rafiqul Isla

Keyword(s):

Packed Cell Volume ◽

Hematological Parameters ◽

The Other ◽

Control Group ◽

Blood Parameter ◽

Withdrawal Period ◽

Significant Difference ◽

Group A ◽

Group B ◽

Control Group Group

Hematological indication is an important finding for pathophysiology analysis of biological science. This study was designed with the aim to investigate the effects of residual antibiotics on hematological parameters of broiler following discriminate and indiscriminate use. 18 broiler DOC (Cobb-500) were reared up to 31 days. On day 16, they were randomly divided into 3 groups, namely Group–A (Control group), Group-B (Discriminate group) and Group-C (Indiscriminate group). Each group contains 6 birds. The discriminate and indiscriminate group was treated with antibiotic, enrofloxacin. In Group-B withdrawal period was followed and treatment was stopped before 7 days of sacrifice. On the other hand, withdrawal period was not maintained in indiscriminate group and the antibiotic treatment was continued until the day of sacrifice. The Total erythrocyte count (million/mm3) of control, discriminate, and indiscriminate groups were 3.15±0.047, 2.66±0.091, and 2.90±0.11 respectively. The Hb (gm%) of control, discriminate, and indiscriminate groups were 8.17±0.07, 7.37±0.09, and 7.28±0.07 respectively. The Packed Cell Volume (%) of control, discriminate, and indiscriminate group were 24.17±0.48, 23.17±0.48, and 22.33±0.67 respectively. There was no significant difference on blood parameter found among the groups. Therefore, discriminate and indiscriminate use of enrofloxacin has no bad effect on hematological parameters of broiler.

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Effect of prophylactic treatments on the superficial roughness of dental tissues and of two esthetic restorative materials

Pesquisa Odontológica Brasileira ◽

10.1590/s1517-74912003000100012 ◽

2003 ◽

Vol 17 (1) ◽

pp. 63-68 ◽

Cited By ~ 6

Author(s):

Daniele Salami ◽

Maria Aparecida Alves de Cerqueira Luz

Keyword(s):

Electron Microscopy ◽

Scanning Electron Microscopy ◽

Dental Plaque ◽

Composite Resin ◽

Sem Analysis ◽

The Other ◽

Tooth Surface ◽

Dental Tissues ◽

Restorative Materials ◽

Scanning Electron

Dental prophylaxis is a common way to remove dental plaque and stain, both undesirable factors in most dentistry procedures. However, besides cleaning the tooth surface, prophylactic techniques may increase the surface roughness of restorations and dental tissues, which, in turn, may result in plaque accumulation, superficial staining and superficial degradation. This study evaluated the effect of three prophylactic techniques - sodium bicarbonate jet, pumice paste and whiting paste - on the superficial roughness of two restorative materials - a composite resin and a compomer - and on the superficial roughness of two dental surfaces - enamel and cementum/dentin - through rugosimetric and scanning electron microscopy (SEM) analysis. Statistical analysis of the rugosimetric data showed that the use of pumice paste on enamel produced a significantly smoother surface than the natural surface. However, comparing the effect of the three techniques, prophylaxis with the pumice paste produced a rougher surface than did the other techniques as regards enamel and cementum/dentin probably due to its abrasiveness. On composite resin, the pumice paste only produced a rougher surface than did the whiting paste. On compomer, all of the applied treatments produced similar results. Based on rugosimetric and SEM analysis, we could conclude that the prophylactic treatments employed did not improve roughness of the studied surfaces. As to the effects of the techniques, they were different depending on the surfaces on which the prophylactic treatments were applied.

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Effect of Vital Bleaching on Micromorphology of Enamel Surface: an in Vitro Study

Primary Dental Journal ◽

10.1177/2050168420980966 ◽

2021 ◽

Vol 10 (1) ◽

pp. 126-131

Author(s):

Zakaria Karimi ◽

Houda Saoui ◽

Majid Sakout ◽

Faiza Abdallaoui

Keyword(s):

In Vitro Study ◽

Sem Analysis ◽

Vitro Study ◽

Enamel Surface ◽

The Other ◽

Bleaching Agent ◽

Surface Porosity ◽

Scanning Electron ◽

At Home

Objectives: The aims of this in vitro study was to investigate the effects of bleaching agents commonly used in micromorphology of the enamel surface and to assess the effect of concentration and of adding fluoride in the bleaching agents. Methods: Sixty freshly extracted intact teeth were stored in distilled water. One half of each tooth was served as control, the other part was treated with bleaching agent. Samples were randomly divided into six groups of ten, according to the bleaching agents: G1- at-home-CP10; G2- at-home-CP16; G3- at-home-CP22; G4- in-office-CP35; G5- in-office-HP40 with fluoride; G6- in-office-HP40 without fluoride. Enamel specimens for each group were then submitted to a quantitative scanning electron microscopy. Number of pores and their diameter were measured to assess porosity of enamel surface. Results: SEM analysis revealed enamel surface porosity after bleaching. Significant increase in number and major diameter of pores in bleached samples (p<0.001) were observed. The comparison between samples treated with 10% PC and samples treated with 22% PC showed significant increase in number of pores (p=0.006) and major diameter (p=0.001) from samples treated with 22% PC. Statistical analyses showed significant increase in the number of pores (p=0.006) from samples treated with 40% HP without fluoride compared to samples treated with 40% HP containing fluoride. Conclusions: Bleaching products with low concentration cause less porosity at surface of the enamel compared to concentrated products. Adding fluoride in the bleaching agent appears to reduce porosity of enamel surface.

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Effects of peroral supplementation of different forms of zinc on the ruminal mucosa of goat kids – a morphometric study

Acta Veterinaria Brno ◽

10.2754/avb201382040399 ◽

2013 ◽

Vol 82 (4) ◽

pp. 399-403 ◽

Cited By ~ 5

Author(s):

Julius Černík ◽

Leoš Pavlata ◽

Alena Pechová ◽

Ľubica Mišurová ◽

Olga Jokverová ◽

...

Keyword(s):

Zinc Supplementation ◽

Experimental Period ◽

The Other ◽

Morphometric Study ◽

Control Group ◽

Group A ◽

Group B ◽

Group D

The aim of the study was to identify the effect of supplementation of various forms of zinc on the ruminal mucosa and dimensions of ruminal papillae in 6-month-old goat kids. The experimental period lasted from weaning to slaughter (4 months). All 20 kids divided into four groups of five animals, were fed with the same feeding dose, which was different only in the quantity and form of zinc. Control group was without additional zinc supplementation (group A), the other groups were supplemented with zinc in the form of ZnO (group B), zinc in the form of chelate (group C) and zinc in the form of lactate (group D). Samples for histopathological and morphometric examination were collected after the slaughter of all animals from the bottom of saccus ruminis ventralis everytime from the same place. Significant differences were reported within the comparison of the length of ruminal papillae between groups B and C (P = 0.026) and B and D (P = 0.040), within the comparison of the width of ruminal papillae between groups A and D (P = 0.020) and within the comparison of the intensity of keratinisation of the mucosa of ruminal papillae between groups A and B (P = 0.034), A and C (P = 0.038) and A and D (P = 0.001). Histopathological and morphometric examination of ruminal mucosa indicated that the ruminal papillae of kids supplemented with zinc in the form of ZnO (group B) were better developed compared to the other groups. This result indicates better utilisation of the supplemented zinc in the form of ZnO.

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Influence of Freeze Acclimation Procedure on Survival and Regrowth of Container-grown Campanula takesimana Nakai.

HortTechnology ◽

10.21273/horttech.7.1.43 ◽

1997 ◽

Vol 7 (1) ◽

pp. 43-46

Author(s):

Todd A. Herrick ◽

Leonard P. Perry

Keyword(s):

Beneficial Effect ◽

Exposure Duration ◽

The Other ◽

Control Group ◽

Natural Conditions ◽

Freeze Thaw ◽

Group A ◽

Group B ◽

Controlled Freezing ◽

Group D

Crown divisions of Campanula takesimana were potted 1 Sept. 1994 and were grown under natural conditions until 19 Nov., when they were moved into a 3 °C greenhouse. On 15 Feb. 1995, 10 plants were randomly assigned to each of four temperature treatments (−5, −8, −11, and −14 °C), using each of four freeze acclimation procedures designated A through D: group A plants were held at treatment temperatures for 30 minutes; group B plants were first subjected to three alternating freeze-thaw cycles (−3 °C for 24 hours, 3 °C for 24 hours), then held at treatment temperatures for 30 min; plants in group C were held at −1 °C for 14 days and subsequently were exposed to treatment temperatures for 30 minutes; group D plants were held at treatment temperatures for 48 hours. A control group was held at 3 °C for the duration of the study. Following 6 weeks regrowth at 15 °C, plants were rated for survival and regrowth quality relative to unfrozen controls. At treatment temperatures of −8 °C and less, acclimation procedure significantly influenced survival and regrowth quality. Plants exposed to three freeze-thaw cycles had the highest regrowth ratings at treatment temperatures less than −5 °C, with no loss in marketability following exposure to −11 °C. In addition, all plants exposed to freeze-thaw cycles thrived following controlled freezing, whereas those in each of the other groups displayed a decline in survival with decreasing treatment temperatures. Holding plants for 14 d at −1 °C had no beneficial effect on survival or regrowth quality relative to plants held at constant above-freezing temperatures. Increasing exposure duration from 30 minutes to 48 hours significantly reduced regrowth quality at treatment temperatures of −8 °C and −11 °C.

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The effect of a 3% hydroxyapatite paste prophylaxis after different root-scaling procedures in periodontics

Revista de Odontologia da UNESP ◽

10.1590/1807-2577.04019 ◽

2019 ◽

Vol 48 ◽

Author(s):

Luis Gustavo Gonzalez OSUNA ◽

Guilherme José Pimentel Lopes de OLIVEIRA ◽

Lucas Henrique de Souza TEIXEIRA ◽

Claudia Oliveira MARQUEZ ◽

Milena Suemi IRIE ◽

...

Keyword(s):

Surface Roughness ◽

Root Surface ◽

Sem Analysis ◽

The Other ◽

Control Group ◽

Scaling Method ◽

Morphological Aspects ◽

Root Dentin ◽

Root Surfaces ◽

Scanning Electron

Abstract Introduction Root-scaling procedures on the root surface show to increase root surface roughness during instrumentation. The use of a prophylactic paste reduces the roughness. Objetive This study evaluated the influence of prophylaxis paste on the surface roughness of root dentin after hand instruments (HI), ultrasonic scalers (US) and rotational instruments (RI) were applied to root surfaces. Material and method Fifty bovine roots were prepared and randomly divided into 10 groups (n=5) in which instrumentation with HI, US, or RI was carried out with or without prophylaxis using either conventional or 3% hydroxyapatite paste; additionally, a control group without treatment was included. The Ra and Rz roughness values were measured using a perfilometer. The morphological aspects of the root surfaces were analysed qualitatively by scanning electron microscopy (SEM). Data were analysed using two-way ANOVA followed by Tukey’s test (α = 0.05). Result The scaling method and the prophylaxis procedure significantly influenced (p < 0.05) root surface roughness. Treatment with US and prophylaxis with 3% hydroxyapatite paste resulted in lower values of Ra (0.14 μm ± 0.02 μm) and Rz (0.89 μm ± 0.18 μm) compared to the other groups. SEM analysis showed smoother and more homogeneous surfaces in the groups with prophylaxis compared to the groups without prophylaxis. There were no substantial differences between the results of applying different pastes. Conclusion The prophylaxis procedure performed with the experimental paste containing 3% hydroxyapatite reduced the roughness of root surfaces treated with HI, US and RI at the same level as the conventional prophylactic paste.

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