Assessment of bracket surface morphology and dimensional change

Radhakrishnan, Pillai Devu; Varma, N K Sapna; Ajith, V V

doi:10.4103/0976-237x.205045

Cited by 7 publications

(6 citation statements)

References 23 publications

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“…Comparing our results to previous research, slot height presented average height value grater than recommended (Bhalla, Good, McDonald, Sherriff, & Cash, ; Cash, Good, Curtis, & McDonald, ; Jones et al, ; Kusy & Whitley, ; Radhakrishnan et al, ; Zinelis, Annousaki, Makou, & Eliades, ). However, more recent research shows that the height of the slot presents with a lower average value, but still with significantly smaller negative deviation (Major, Carey, Nobes, & Major, ).…”

Section: Discussionsupporting

confidence: 65%

“…However, these parameters may change during the manufacturing and finishing process, which may lead to modifications of the bracket's features, such as an increase or decrease in the slot height, as well as a loss of parallelism of the inner walls, resulting in converging or diverging of them. When these changes are present, fitting is not correct and the expected relationship between the wire and the bracket changes, thereby decreasing the efficiency of any type of mechanical treatment (Dolci, Spohr, Zimmer, & Marchioro, ; Radhakrishnan, Sapna Varma, & Ajith, ). Another change that may occur is related to the angle of torque, which can be increased or decreased since the bracket is intended to precisely fit on the buccal or lingual inclination of each dental element, thereby making it difficult to control some mechanical parameters (Dolci et al, ; Radhakrishnan et al, ).…”

Section: Introductionmentioning

confidence: 99%

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Precision brackets for upper lateral incisors in Bioprogressive therapy

Araujo

Guedes

Cunha

et al. 2019

Microscopy Res & Technique

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Orthodontic brackets, specifically in their slots, are responsible for receiving active orthodontic forces and transferring them to the teeth to be moved. The presence of an altered slot or inaccurate dimensions can influence the mechanical relationship between the bracket and archwire, interfering with the biomechanics of tooth movement. The objective of this study was by comparing the accuracy of slot placement of upper right lateral incisor metal brackets for Bioprogressive Ricketts therapy from five trademarks. The following characteristics were evaluated: height, torque, and internal parallelism of the walls of the slot. The sample included 75 brackets, 15 each from the following trademarks: 3M Abzil, Forestadent, Morelli Rocky Mountain Orthodontics, and Tecnident. Images of the slot profiles were obtained through standardized techniques using scanning electron microscopy, measured by the AutoCAD 2017 software, and compared to Ricketts prescription, respecting standard deviation with the technical and tolerance parameters present in standard ISO 27020. The results indicated that most of the evaluated characteristics were in accordance with the standard parameters, considering the tolerance adopted. There were exceptions found to this pattern of precision in the 3M Abzil brackets with regard to torque variation, and the Morelli brackets in relation to height variation and parallelism between the walls of the slot. Considering the measured dimensional characteristics, the metal brackets used in Bioprogressive Ricketts therapy has satisfactory pattern accuracy; however, there are still some specific inaccuracies in brackets from certain brands that can require more attention during the detailing phase. K E Y W O R D S brackets, parallelism, size, slot, torque

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Section: Discussionsupporting

confidence: 65%

Section: Introductionmentioning

confidence: 99%

Precision brackets for upper lateral incisors in Bioprogressive therapy

Araujo

Guedes

Cunha

et al. 2019

Microscopy Res & Technique

View full text Add to dashboard Cite

show abstract

“…The two debracketing techniques were expected to result in different ARI scores. However, the ARI score and the presence of calcium were similar in the two methods, despite the difference in force applied, which was previously measured [15]. The explanation for this dichotomy is that the crack is probably initiated at the level of the adhesive layer and propagated at the bracket-adhesive or adhesiveenamel interface.…”

Section: Discussionmentioning

confidence: 63%

“…This is supported by a short-term study that showed that the rupture occurs at the bracket-adhesive interface [16]. Further recent studies [14,15] demonstrated that after a longer period of time, 24 months, the composite is completely polymerized with a strong adhesion force. Another aspect to consider is that the enamel under the sole of the bracket may be affected by decalcification resulting from food debris and poor hygiene that damages the enamel-adhesive bond.…”

Section: Discussionmentioning

confidence: 76%

Effects of Composite Resin on the Enamel after Debonding: An In Vitro Study—Metal Brackets vs. Ceramic Brackets

et al. 2021

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Fixed orthodontic therapies include several procedures that can affect the enamel surface. The aim of this study was to assess the action of composite resin on the surface of the tooth through variation of enamel changes after debonding metal and ceramic brackets, by means of scanning electron microscopy. An in vitro study was conducted on 48 human premolar specimens, which were extracted within a period of two months for orthodontic purposes. On half of them, metal brackets were bonded, and on the other half, ceramic brackets (Al2O3) were bonded, using light cure adhesive paste and a two-step, etch-and-bonding technique. The brackets were debonded after 24 h using a straight debonding plier. The adhesive remnant index (ARI) was determined by visual observation of the specimen. Post-debonding scans were aligned with the baseline, and the surfaces’ changes were quantified. A quantitative analysis was made on the debonded brackets to determine the presence or absence of enamel on the base pad. Evaluation of pre-bonded and post-clean-up enamel surface revealed no crack and increased roughness in both ceramic and metal brackets, which was higher for the ceramic ones. The enameled band (perikymata), artificial caries, or the superficial fissures revealed in the pretreatment stage were replaced with the loss of the prismatic structure and the presence of remnant adhesive. No enamel substance was found on the base pad. The ARI tooth was higher for metallic brackets than for ceramic ones. Metallic brackets and ceramic brackets have undergone mechanical changes by showing fractures in their structure. According to our present investigation, we can conclude that the adhesive composite resin is safe for use on both metal and ceramic brackets in orthodontic treatments, with no iatrogenic enamel damages.

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“…Since SSCs are placed in the oral environment for several years and affected by physical and chemical factors such as saliva secretion, chewing, brushing, acidic beverages, abrasion and composition of biofilms, their surface changes. The changing of surface area, increases bacterial adhesion and surface roughness [27]. As a few cases of perforation have been seen in crowns, it was attempted to test the physical and mechanical properties of some brands of SSCs in the market.…”

Section: Introductionmentioning

confidence: 99%

Comparative Evaluation of Physical and Mechanical Properties of Different Brands of Primary Molar Stainless-Steel Crowns: An In Vitro Study

Bamdadian

Pasdar

Alhavaz

et al. 2019

Open Access Maced J Med Sci

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BACKGROUND: There is some cases of perforation and undesirable properties of some primary molars stainless steel crowns. AIM: The aim of this study was to compare the physical and mechanical properties of different commercial brands of these crowns. METHODS: In an in vitro study, a total of 10 stainless steel tooth crowns of the second primary mandibular molars size 6 of 4 different commercial brands (a total of 280 crowns) were evaluated. These crowns were included KTR Pre-trimmed and Crimped Nichro Stainless Steel Primary Molar Crowns (KTR, China); 3M Stainless Steel Primary Molar Crowns (ESPE, St paul; USA); NuSmile SSC Pre-contoured (Inc, Houstone, TX; USA) and Kids crown (Shinghung, Seoul; Korea). Corrosion and galvanic corrosion, wear, microhardness, compressive strength, fatigue strength of crowns and weight percent of elements were investigated. RESULTS: The highest rate of microhardness, compressive and Fatigue strength of the crowns were made by Nu Smile > 3M > Kids Crown > KTR respectively. The highest rate of corrosion potential in corrosion and Galvanic corrosion tests was in KTR > Kids crowns > 3M > Nu smile respectively. The order of crown wear was KTR > Kids Crown > 3M > Nu Smile respectively. The highest amount of nickel element was found in the Nu Smile crown and the highest amount of chrome in the 3M crown with a significant difference with others (p < 0.001). The KTR and Kids crowns lacked molybdenum. CONCLUSION: The results showed that Nu Smile crown has better physical and mechanical properties than other evaluated crowns in this study.

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Assessment of bracket surface morphology and dimensional change

Cited by 7 publications

References 23 publications

Precision brackets for upper lateral incisors in Bioprogressive therapy

Precision brackets for upper lateral incisors in Bioprogressive therapy

Effects of Composite Resin on the Enamel after Debonding: An In Vitro Study—Metal Brackets vs. Ceramic Brackets

Comparative Evaluation of Physical and Mechanical Properties of Different Brands of Primary Molar Stainless-Steel Crowns: An In Vitro Study

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