Microabrasion: A Treatment Option For White Spots

2014 ◽  
Vol 39 (1) ◽  
pp. 27-29 ◽  
Author(s):  
MQ Souza de Barros Vasconcelos ◽  
K Almeida Vieira ◽  
M da Consolação Canuto Salgueiro ◽  
T Almeida Alfaya ◽  
C Santos Ferreira ◽  
...  
Keyword(s):  
Treatment Option ◽  
Resin Composite ◽  
Lateral Incisor ◽  
White Spot ◽  
Cervical Region ◽  
Carious Lesion ◽  
Clinical Protocol ◽  
Abrasive Material ◽  
Tooth Color ◽  
White Spots

The aim of the present study was to describe a clinical protocol for the treatment of white spots with the use of an abrasive material. A four-year-old patient presented with a white spot on tooth 51 and a white spot associated with a carious lesion in the cervical region of tooth 52. Treatment was planned with microabrasion and restoration of the upper right lateral incisor. Prophylaxis was first performed, followed by protection with a dental dam and the application of the abrasive material (silicon carbide and hydrochloric acid 6%). Five applications were needed to remove the spots. The restoration of the upper right lateral incisor was then performed with a resin composite. A good esthetic outcome was achieved and both the patient and her guardians were satisfied with the results. Microabrasion is a conservative treatment option that achieves satisfactory results with regard to tooth color.

Etiology of White Spot Defect in Swiss Cheese Made from Pasteurized Milk

1986 ◽  
Vol 49 (9) ◽  
pp. 718-723 ◽  
Author(s):  
K. R. NATH ◽  
B. J. KOSTAK
Keyword(s):  
Eye Development ◽  
Lactobacillus Fermentum ◽  
White Spot ◽  
Co2 Production ◽  
Broth Culture ◽  
Complete Dissolution ◽  
Swiss Cheese ◽  
Streptococcus Faecalis ◽  
Pasteurized Milk ◽  
White Spots

Swiss cheese made from fully pasteurized milk developed white spots during hot room stay. This cheese was bitter and eye development was generally retarded. Streptococcus faecalis subsp. liquefaciens was isolated in high numbers from the spot; it caused bitterness in milk cultures with complete dissolution of the milk clot. The isolate was inhibitory to propionibacteria and Lactobacillus fermentum; CO2 production by Propionibacterium was depressed in broth culture in the presence of the S. faecalis subsp. liquefaciens isolate.

scholarly journals The quality of etched enamel in different regions and tooth types and its significance in bonding and the development of white spot lesions

2021 ◽  
Author(s):  
Elisabeth C. Barnhart ◽  
Phillip M. Campbell ◽  
Amal Noureldin ◽  
Katie Julien ◽  
Peter H. Buschang
Keyword(s):  
White Spot ◽  
Cervical Region ◽  
White Spot Lesions ◽  
Micro Computed Tomography ◽  
Human Teeth ◽  
Posterior Teeth ◽  
Material Density ◽  
Anterior Teeth ◽  
Before And After

ABSTRACT Objectives To quantify differences in the etch quality of enamel within and between human teeth, which has not previously been attempted. Materials and Methods The buccal right and left halves of 27 extracted human teeth were randomly allocated to scanning electron microscopy (SEM) or micro–computed tomography (μCT) for evaluation. The buccal surfaces were pumiced, etched with 37% phosphoric acid gel etchant for 15 seconds, rinsed, and air dried. Each tooth was divided into three regions (incisal, middle, and cervical) and viewed after etching at 1200× magnification with SEM. The μCT scans were taken before and after etching to calculate apparent and material mineral densities. Results SEM showed greater aprismatic enamel and poorer etch quality (ie, significantly less percentage enamel) for the posterior than anterior teeth and for the cervical region than for the incisal and middle regions of all teeth. Although there were no density differences prior to etching, μCT demonstrated that etching increased material density significantly more for the anterior than posterior teeth. Prior to etching, the enamel in the cervical regions was significantly less dense than the enamel in the middle or incisal regions. Etching significantly increased the material density of all three regions, which decreased initial regional differences. After etching, the apparent density of the cervical region remained significantly lower than the densities of the other two regions. Conclusions Based on SEM and μCT, there is greater aprismatic enamel and inferior etch quality in the cervical regions of all tooth types and is clinically significant in explaining the failure of sealant retention and the propensity for white spot lesions.

Specific systemic IgG1, IgG2 and IgM responses in pigs immunized with infective eggs or selected antigens of Ascaris suum

Parasitology ◽  
2003 ◽  
Vol 127 (3) ◽  
pp. 291-298 ◽  
Author(s):  
E. FRONTERA ◽  
A. CARRÓN ◽  
F. J. SERRANO ◽  
A. ROEPSTORFF ◽  
D. REINA ◽  
...  
Keyword(s):  
Ascaris Suum ◽  
Acquired Resistance ◽  
White Spot ◽  
Control Groups ◽  
Positive Correlation ◽  
Group 4 ◽  
White Spots ◽  
Challenge Control

A total of 35 pigs aged 15 weeks old, and 21 pigs aged 8 weeks old were divided into 7 groups. Groups 1 and 2 were uninfected and challenge control groups, respectively. Groups 3 and 4 were infected weekly with 6 increasing doses of Ascaris suum eggs, and group 4 was additionally treated with pyrantel. Groups 5, 6, and 7 were immunized weekly with the 14, 42, or 97 kDa fractions from adult worms, respectively. Animals of groups 2–7 were challenged with 10 000 A. suum eggs 7 days after the last infection/immunization. Serum was sampled weekly and specific IgG1, IgG2, and IgM responses were measured. Pigs of groups 5, 6, and 7 showed high IgG1 and IgG2 responses especially against adult worms antigens, while infected groups had high IgG1 and IgM responses, especially against larva. The IgG1 responses were negatively correlated to the numbers of larvae in the lungs, and positively associated with the liver white spot numbers. There was a positive correlation between IgG2 and the numbers of white spots and lung larvae, while IgM was negatively correlated with these parasitological measures. These findings are discussed and it is suggested that acquired resistance against A. suum larvae is correlated with the induction of IgG1 and IgM, and not with IgG2, and that future vaccination protocols may focus on inducing the Th2 activity.

scholarly journals Influence of Sealer and Light-Curing Units on Push-Out Bond Strength Of Composite Resin to Weakened Roots

2016 ◽  
Vol 27 (4) ◽  
pp. 430-435 ◽  
Author(s):  
Adriana Corrêa de Lima ◽  
Fuad Jacob Rached-Junior ◽  
Natália Spadini de Faria ◽  
Danielle Cristine Messias ◽  
Carolina de Andrade Lima Chaves ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Laser Scanning Microscopy ◽  
Cervical Region ◽  
Confocal Laser ◽  
Filling Material ◽  
Ah Plus ◽  
Light Curing ◽  
Push Out

Abstract The aim of this study was to assess the influence of sealer and light-curing unit on regional bond strength of resin composite to the weakened roots. Ninety roots of incisors were experimentally weakened, subjected to biomechanical preparation and filled with either Endofill, AH Plus or MTA Fillapex The roots were desobturated e reinforced with resin composite and fiber post light-activated with one of the light sources: halogen at 600 mW/ cm2 (QTH-600), LED at 800 mW/ cm2 (LED-800) and LED at 1500 mW/ cm2 (LED-1500). The roots were sectioned in slices from cervical, middle and apical root-reinforcement regions and analyzed by push out test, scanning electron microscopy (SEM) and confocal laser scanning microscopy (CLSM). Bond strength data were analyzed using three-way ANOVA and Tukey´s test (α=0.05). Specimens filled with AH Plus had higher bond strength, followed by MTA Fillapex and Endofill (p<0.05). For light-curing unit, LED-1500 presented superior bond strength than LED-800, which was higher than QTH-600 (p<0.05). The cervical region had the greatest mean values (p<0.05) while apical part showed the lowest bond strength (p<0.05). CLMS revealed remaining filling material in the dentinal tubules for all groups. The eugenol-containing sealer (Endofill) compromised the push-out bond strength of composite resin to the root dentin. Bond strength was favored in the cervical region, and when LED-1500 was used.

Surface white spot and pitting corrosion of 316 L stainless steel

2020 ◽  
Vol ahead-of-print (ahead-of-print) ◽  
Author(s):  
Guanghui Yi ◽  
Dajiang Zheng ◽  
Guang-Ling Song
Keyword(s):  
Stainless Steel ◽  
Corrosion Resistance ◽  
Pitting Corrosion ◽  
Electrochemical Impedance ◽  
White Spot ◽  
General Corrosion ◽  
Corrosion Performance ◽  
Content Type ◽  
White Spots ◽  
316 L Stainless Steel

Purpose The purpose of this paper is to address the concern of some stainless steel users. To understand the effect of surface white spots on corrosion performance of stainless steel. Design/methodology/approach White spots appeared on some component surfaces made of 316 L stainless steel in some industrial applications. To address the concern about the pitting performance in the spot areas, the pitting corrosion potential and corrosion resistance were measured in the spot and non-spot areas by means of potentiodynamic polarization and electrochemical impedance spectroscopy and the two different surface characteristics were analytically compared by using optical microscopy, laser confocal microscopy, scanning electron microscopy, x-ray diffraction, energy dispersive spectroscopy and auger energy spectroscopy. The results indicated that the pitting performance of the 316 L stainless steel was not negatively influenced by the spots and the white spots simply resulted from the slightly different surface morphology in the spot areas. Findings The white spots are actually the slightly rougher surface areas with some carbon-containing species. They do not reduce the pitting resistance. Interestingly, the white spot areas even have slightly improved general corrosion resistance. Research limitations/implications Not all surface contamination or roughening can adversely affect the corrosion resistance of stainless steel. Practical implications Stainless steel components with such surface white spots are still qualified products in terms of corrosion performance. Originality/value The surface spot of stainless steel was systematically investigated for the first time for its effect on corrosion resistance and the conclusion was new to the common knowledge.

scholarly journals Unusual case of internal resorption in cervical region of maxillary left lateral incisor

2005 ◽  
Vol 15 (1) ◽  
pp. 139-142
Author(s):  
Kazuhiko Nakano ◽  
Noriko Shimizu ◽  
Takashi Komura ◽  
Takashi Ooshima
Keyword(s):  
Unusual Case ◽  
Lateral Incisor ◽  
Cervical Region

scholarly journals Comparative study of adhesive systems applied to different regions of dental substrate

2017 ◽  
Vol 31 (4) ◽  
pp. 158
Author(s):  
Veridiana Camilotti ◽  
Virgínia Bosquiroli ◽  
Máx Dobrovolski ◽  
Mario Alexandre Coelho Sinhoretic ◽  
Priscilla Busatoa Do Monte Ribeiro ◽  
...  
Keyword(s):  
Bond Strength ◽  
Composite Resin ◽  
Resin Composite ◽  
Adhesive System ◽  
Cervical Region ◽  
Test Machine ◽  
Adhesive Failure ◽  
Adhesive Systems ◽  
Type Analysis ◽  
Microshear Bond Strength

OBJECTIVE: The aim of this study was to evaluate the bond strength (BS) of different self-etching adhesive systems to bovine dentin.METHODS: For this purpose, 50 teeth were flattened with silicon carbide abrasive papers and randomly divided into 5 groups: SB – Single Bond Plus; Group AEO – Adper Easy One; Group ADH – AdheSE; Group ASE – Adper SE Plus and Group Clear – Clear Fill. After adhesive system application, 5 Tygon cylinders (1.8 mm×2 mm) were placed on the vestibular surface of each tooth, filled with resin composite (Filtek Z350) and light activated. Three composite resin cylinders were fabricated for each bovine crown, one being located in the incisal region, one in the middle third and one in the cervical region, totaling 30 composite resin test specimens (TS) for each group. The TS were submitted to the microshear bond strength test in a Universal Test Machine  Kratos), at a cross-head speed of 0.5 mm/min.RESULTS: The BS was calculated and analyzed by ANOVA (one-way) and Tukey’s test (p<0.05). The highest BS values were obtained in Group SB and there were no significant differences between the adhesive systems tested in the middle and cervical thirds. In the fracture type analysis it was found that adhesive failure was dominant for all groups.CONCLUSION: The conventional two-step adhesive system SB presented the highest bond strength mean to bovine dentin for all the regions.

scholarly journals Preventive Effect of Ozone on the Development of White Spot Lesions during Multibracket Appliance Therapy

2009 ◽  
Vol 79 (1) ◽  
pp. 64-69 ◽  
Author(s):  
Otmar Kronenberg ◽  
Adrian Lussi ◽  
Sabine Ruf
Keyword(s):  
Protective Effect ◽  
Preventive Measure ◽  
White Spot ◽  
Dental Arch ◽  
Visual Evaluation ◽  
Initial Caries ◽  
White Spots ◽  
Multibracket Appliance ◽  
Caries Lesions ◽  
Spot Formation

Abstract Objective: To test the null hypotheses: (1) there is no difference in the caries protective effect of ozone and Cervitec/Fluor Protector during multibracket (MB) appliance therapy, and (2) DIAGNOdent and quantitative light-induced fluorescence (QLF) are not superior to a visual evaluation of initial caries lesions. Materials and Methods: Twenty right-handed patients with a very poor oral hygiene who required full MB appliance therapy were analyzed during 26 months. In a split-mouth-design, the four quadrants of each patient were either treated with ozone, a combination of Cervitec and Fluor Protector, or served as untreated controls. The visible plaque index (VPI) and white spot formation were analyzed clinically. DIAGNOdent and QLF were used for a quantitative assessment of white spot formation. Results: The average VPI in all four dental arch quadrants amounted to 55.6% and was independent of the preventive measure undertaken. In the quadrants treated with Cervitec/Fluor Protector, only 0.7% of the areas developed new, clinically visible white spots. This was significantly (P &lt; .05) less than in the quadrants treated with ozone (3.2%). The lesions detected with QLF only partially corresponded to the clinically detected white spots, while DIAGNOdent proved to be unable to detect any changes at all. Conclusions: The caries protective effect of Cervitec/Fluor Protector during MB therapy was superior to ozone, and a visual evaluation of initial caries lesions was superior to both DIAGNOdent and QLF.

Multidisciplinary Approach to Delayed Treatment of Traumatic Teeth Injuries Involving Extrusive Luxation, Avulsion and Crown Fracture

2014 ◽  
Vol 39 (6) ◽  
pp. 566-571 ◽  
Author(s):  
Ü Şermet Elbay ◽  
A Baysal ◽  
M Elbay ◽  
S Sarıdağ
Keyword(s):  
Root Canal ◽  
Multidisciplinary Approach ◽  
Resin Composite ◽  
Pediatric Dentistry ◽  
Root Canal Treatment ◽  
Lateral Incisor ◽  
Central Incisor ◽  
Traumatic Injuries ◽  
Delayed Treatment ◽  
University Department

SUMMARY A 12-year-old boy with extrusion of the maxillary right central incisor, uncomplicated fracture of the left central incisor, avulsion of the mandibular right and left central incisors, and crown fracture of the mandibular right lateral incisor presented to the Kocaeli University Department of Pediatric Dentistry 20 days after sustaining the traumatic injuries. Orthodontic repositioning of the extrusive maxillary right central incisor was planned. Additionally, this tooth was necrotic and needed root canal treatment. The maxillary left central incisor and right mandibular lateral incisor were necrotic and needed root canal treatment. The orthodontic and endodontic treatments were successfully performed simultaneously. Restoration of the fractured mandibular right lateral incisor and maxillary left central incisor was completed with resin composite. Subsequent to orthodontic and endodontic treatment, prosthodontic rehabilitation was performed. At the two-year followup, the teeth appeared normal and the patient had no complaints.

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