Corrosion Damage Investigation of Silver-Soldered Stainless Steel Orthodontic Appliances Used in Vivo / Ocena Zniszczeń Korozyjnych Używanych In Vivo Stałych Aparatów Ortodontycznych O Połączeniach Lutowanych Na Bazie Srebra

Processes of destruction of products used in orthodontic treatment, e.g. fixed orthodontic appliances, microimplants or dental prostheses considerably limit its operational lifetime and comfort and safety of patients. The objective of the research was to evaluate and assess corrosion damage to silver-soldered stainless steel rapid palatal expansion Hyrax devices. Used in vivo for 2 or 6 months, respectively, RPE (rapid palatal expansion) devices were analyzed macroscopically and in a scanning electron microscope with an energy X-ray analyzer for signs of corrosion. The evaluated appliances showed discernible differences between the overall condition of the noble solders and the stainless steel elements. The Ag-rich solders were chiefly covered in corrosion pits, whereas stainless steel wires, molar bands and Hyrax screws presented corrosion-free surfaces. What is more, the EDS analysis showed differential element composition of the solders. According to the results, noble materials, such as Ag-rich solders, can corrode in a salivary environment when coupled with stainless steel. The selective leaching processes are observed.

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Observational Study Regarding Possible Side Effects of Miniscrew-Assisted Rapid Palatal Expander (MARPE) with or without the Use of Corticopuncture Therapy

Biology ◽

10.3390/biology10030187 ◽

2021 ◽

Vol 10 (3) ◽

pp. 187

Author(s):

Eugen Silviu Bud ◽

Cristina Ioana Bică ◽

Mariana Păcurar ◽

Petru Vaida ◽

Alexandru Vlasa ◽

...

Keyword(s):

Observational Study ◽

Orthodontic Appliances ◽

Maxillary Expansion ◽

Palatal Expansion ◽

Rapid Palatal Expansion ◽

Basal Bone ◽

Fixed Orthodontic Appliances ◽

Before And After ◽

Palatal Mucosa ◽

Mid Palatal Suture

The use of maxillary expanders has the effect of distancing the maxillary bones at the level of the median palatal suture. During maxillary expansion, the main resistance forces occur at the zygomatico-maxillary sutures, and not in the median palatal suture, which is the basic principle on which this method is based. In this observational study, we evaluated possible complications at the skeletal and dentoalveolar level after palatal split using miniscrew-assisted rapid palatal expansion (MARPE) associated or not with corticopuncture (CP) therapy. The study included 27 patients with maxillary transverse deficiency and unilateral or bilateral cross-bite. Skeletal and dentoalveolar changes were evaluated using cone beam computed tomography (CBCT) images acquired before and after expansion. The mid-palatal suture was separated in 88.88% of cases, buccal bone height of the alveolar crest had decreased at first molar both at oral and palatal level by approximately 2.07 mm in 40.7% of cases whilst the remaining 59.3% showed insignificant bone loss, with canines exhibiting buccal tipping of 4.10° in 62.5% of cases. Changes of the occlusal planes were observed in 10 cases (37%). Maxillary canines tended to show symmetric buccal inclinations relative to the maxillary basal bone. Six patients; 22.22% showed hypertrophy/hyperplasia of the palatal mucosa associated with ulcerations, erythema, itching, and discomfort in the area. Swelling at the mid-palatal suture after split was observed in all cases and was caused by the resultant force. No cases of necrosis of the palatal mucosa were observed. Although occlusal modifications occur after palatal split, especially in unilateral cross-bite cases, these changes can be treated with the help of fixed orthodontic appliances.

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Scanning electron microscopic examination of enamel surface after fixed orthodontic treatment: In-vivo study

Srpski arhiv za celokupno lekarstvo ◽

10.2298/sarh1202022s ◽

2012 ◽

Vol 140 (1-2) ◽

pp. 22-28 ◽

Cited By ~ 9

Author(s):

Tijana Sessa ◽

Jelena Civovic ◽

Tina Pajevic ◽

Jovana Juloski ◽

Milos Beloica ◽

...

Keyword(s):

Electron Microscopic Examination ◽

Surface Damage ◽

Multivariate Regression Analysis ◽

Enamel Surface ◽

Orthodontic Appliances ◽

Electron Microscopic ◽

Fixed Orthodontic Appliances ◽

Tooth Surfaces ◽

Scanning Electron

Introduction. Therapy with fixed orthodontic appliances starts with bracket bonding and ends with debonding of brackets, leaving enamel surface varied. Objective. The aim of this pilot study was to examine enamel surface before and after debonding of orthodontic brackets by the use of scanning electron microscopy (SEM). Methods. Epoxy replicas of four patients? premolars indicated for therapy with fixed orthodontic appliances were made and brackets were bonded to their teeth with a different adhesives (Enlight, No-mix, Fuji Ortho LC and Heliosit Orthodontic) (n=4). Two months later, brackets on premolars were debonded and amounts of adhesive left on the tooth surfaces and the bracket bases were evaluated with the adhesive remnant index (ARI). After resin removal, epoxy replicas were made and the surface of premolars was evaluated with the enamel surface index (ESI). All replicas of premolars (n=32) were prepared for SEM examination and compared under different magnifications. Tooth damage was estimated based on correlation between ARItooth and ESI. Results. Pearson?s ?2 test showed no significant differences between ARItooth and ARIbracket of four materials used. Nonparametric correlations showed significant differences between ARItooth and ARIbracket, ESI and ARItooth, and between ESI and ARIbracket. Increasing of ARItooth is followed with the descent of ARIbracket and the ascent of ESI. Multivariate regression analysis showed a significant correlation between ESI and ARItooth. Conclusion. Most bond failures took place at enamel-adhesive interface. ARItooth was a predictor to enamel surface damage. The type of material did not affect enamel surface damage.

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Microbiological Evaluation of Octenidine Dihydrochloride Mouth Rinse after 5 Days' Use in Orthodontic Patients

The Angle Orthodontist ◽

10.2319/062008-322.1 ◽

2009 ◽

Vol 79 (4) ◽

pp. 766-772 ◽

Cited By ~ 13

Author(s):

Alev Aksoy Dogan ◽

Emel Sesli Cetin ◽

Emad Hüssein ◽

Ali Kudret Adiloglu

Keyword(s):

Inhibitory Effect ◽

Oral Bacteria ◽

Lactobacillus Species ◽

Orthodontic Appliances ◽

Cariogenic Bacteria ◽

Fixed Orthodontic Appliances ◽

Octenidine Dihydrochloride ◽

Orthodontic Patients ◽

Fixed Appliances

Abstract Objective: To determine the absolute and relative antibacterial activity of octenidine dihydrochloride (OCT) against total and cariogenic bacteria in saliva samples of patients with fixed orthodontic appliances during 5 days of usage. Materials and Methods: The study group consisted of 5 male and 13 female subjects who were selected from patients in the Clinic of Orthodontics. Each patient was given physiologic saline (PS), chlorhexidine gluconate (CHX), polyvinylpyrrolidone-iodine complex (PVP-I), and OCT every morning for 5 days, each separated by a 2-week interval. Total and cariogenic bacteria in saliva samples of orthodontically treated patients with fixed appliances were collected during 5 days of usage. Unstimulated saliva was collected as a baseline sample. Saliva samples were collected at 15 minutes, and on the second, third, and fifth day after rinsing the mouth with any of the solutions for 30 seconds, and bacterial counts were detected. Results: OCT showed an ultimate reduction of total viable oral bacteria, Lactobacillus species, and Streptococcus mutans in vivo. OCT also had a significantly greater inhibitory effect than 0.2% CHX and 7.5% PVP-I, from the beginning of the study until the fifth day after the orthodontic appliances were bonded (P < .1). Conclusions: OCT compared favorably with respect to CHX and PVP-I complex in orthodontically treated patients with fixed appliances (P ≤ .1).

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The effects of utilizing conventional etching versus self etch primer on the enamel color change after treatment with fixed orthodontic appliances: in vivo study

Egyptian Orthodontic Journal ◽

10.21608/eos.2017.77161 ◽

2017 ◽

Vol 52 (12) ◽

pp. 66-72

Author(s):

Ahmad Hafez

Keyword(s):

Color Change ◽

In Vivo Study ◽

Orthodontic Appliances ◽

Fixed Orthodontic Appliances ◽

Self Etch

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IN VIVO ANALYSIS OF LIPID PEROXIDATION AND TOTAL ANTIOXIDANT STATUS IN SUBJECTS TREATED WITH STAINLESS STEEL ORTHODONTIC APPLIANCES

Journal of Health and Allied Sciences NU ◽

10.1055/s-0040-1703684 ◽

2013 ◽

Vol 03 (03) ◽

pp. 083-086

Author(s):

Dilip Daniel Quadras ◽

U.S. Krishna Nayak ◽

Suchetha Kumari N. ◽

Prashant Pujari ◽

Vijay R. ◽

...

Keyword(s):

Lipid Peroxidation ◽

Stainless Steel ◽

Antioxidant Status ◽

Total Antioxidant Status ◽

Immunological Tolerance ◽

Orthodontic Appliances ◽

Time Interval ◽

Total Antioxidant ◽

Fixed Appliances

Abstract Introduction: Nickel is a strong immunologic sensitizer, although nickel sensitivity has been reported to be lower in subjects who have received orthodontic treatment; perhaps they develop immunological tolerance over the long period of treatment. Hence the present aim of the work was to determine the levels of lipid peroxidation and total antioxidant status in Serum and Saliva in subjects treated with stainless steel Orthodontic appliances. Methods and Materials: The study group included 25 participants and Samples were taken in different time intervals: Time interval 1- Collection of samples before the appliances fixed, Time interval 2- Collection of sample after one week of fixed appliances, Time interval 3- Collection of sample after three months of fixed appliances each from the Orthodontic Department of A. B.Shetty Memorial institute of dental science.Lipid peroxidation (Malondialdehyde) level is estimated using Thiobarbituric acid (TBA) method. Total antioxidant level was estimated using Phosphomolybdenum method. Conclusion: Total antioxidant and Malondialdehyde levels are increased in case of Females compared to Males in serum whereas in case of Saliva Total antioxidant level is increased in Time interval 2 and 3 in Males compared to Females.

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Nickel, Chromium and Iron Levels in the Saliva of Patients with Simulated Fixed Orthodontic Appliances

The Angle Orthodontist ◽

10.2319/111806-466.1 ◽

2008 ◽

Vol 78 (2) ◽

pp. 345-350 ◽

Cited By ~ 75

Author(s):

Rodrigo Matos de Souza ◽

Luciane Macedo de Menezes

Keyword(s):

Study Groups ◽

Atomic Absorption Spectrophotometry ◽

Nonparametric Tests ◽

Orthodontic Appliances ◽

Aisi 316L ◽

Nickel Chromium ◽

Fixed Orthodontic Appliances ◽

Group B ◽

Removable Appliance

Abstract Objective: To assess the in vivo release of nickel, chromium, and iron ions into saliva by different metallic brackets. Materials and Methods: Thirty volunteers wore removable appliances with bonded brackets and were divided according to the brand of brackets: group A, 3M/Unitek (AISI 303); group B, American Orthodontics (AISI 316L); and group C, Dentaurum (AISI 316L). The appliances were worn for 60 days, and saliva samples were collected at the following time points: T1, before placement of the appliance; T2, after 10 minutes; T3, 24 hours; T4, 7 days; T5, 30 days; and T6, 60 days after insertion of the removable appliance. Saliva samples were analyzed for nickel, chromium, and iron by atomic absorption spectrophotometry. Statistical analysis was performed by nonparametric tests (Friedman, Mann-Whitney, Kruskal-Wallis). Results: Saliva evaluation revealed a large variation in concentration of these ions between individuals. The results also appeared to indicate an increase in nickel and chromium ions immediately after placement of the appliance (T2), but this was statistically significant only for groups B and C. There was no increase in iron levels. A tendency for increases in nickel and chromium concentrations was verified immediately after placement of the appliance, but these values are probably reduced because of biofilm formation regardless of the bracket used. Conclusion: Nickel and chromium ion concentrations increased immediately after placement of the appliance in the mouth for all study groups. There were no significant differences in the nickel, chromium, and iron levels released by the three groups of appliances at all study periods.

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