Effect of surface treatment of prefabricated teeth on shear bond strength of orthodontic brackets

Abstract

Objective: The aim of this in vitro study was to evaluate and compare the effects of grinding, drilling, sandblasting, and ageing prefabricated teeth (PfT) on the shear bond strength (SBS) of orthodontic brackets, as well as the effects of surface treatments on the adhesive remnant index (ARI). Methods: One-hundred-ninety-two PfT were divided into four groups (n = 48): Group 1, no surface treatment was done; Group 2, grinding was performed with a cylindrical diamond bur; Group 3, two drillings were done with a spherical diamond bur; Group 4, sandblasting was performed with 50-µm aluminum oxide. Before the experiment, half of the samples stayed immersed in distilled water at 37oC for 90 days. Brackets were bonded with Transbond XT and shear strength tests were carried out using a universal testing machine. SBS were compared by surface treatment and by ageing with two-way ANOVA, followed by Tukey’s test. ARI scores were compared between surface treatments with Kruskal-Wallis test followed by Dunn’s test. Results: Surface treatments on PfT enhanced SBS of brackets (p< 0.01), result not observed with ageing (p= 0.45). Groups II, III, and IV showed higher SBS and greater ARI than the Group 1 (p< 0.05). SBS was greater in the groups 3 and 4 (drilling, sandblasting) than in the Group 2 (grinding) (p< 0.05). SBS and ARI showed a positive correlation (Spearman’s R2= 0.57; p< 0.05). Conclusion: Surface treatment on PfT enhanced SBS of brackets, however ageing did not show any relevance. Sandblasting and drilling showed greater SBS than grinding. There was a positive correlation between SBS and ARI.

Effect of shear bond strength of metallic orthodontic brackets bonded with and without dental adhesive

“…However, the results were statistically similar with or without the use of adhesive after thermocycling. This fact shows that it is possible to bond orthodontic brackets effectively, causing less damage to tooth structure [6] and maintaining the effective union between tooth structure and bracket during the orthodontic treatment [26].…”

Shear Bond Strength of Four Types of Orthodontic Retainers after Thermocycling and Cyclic Loading

“…e SBS of retainers must be high enough to resist masticatory stresses. Bond failure increases the chair time and the costs and is inconvenient for patients [23].…”

“…The SBS of retainers must be high enough to resist masticatory stresses. Bond failure increases the chair time and the costs and is inconvenient for patients [ 23 ]. This study assessed the SBS of four types of wires commonly used as fixed lingual retainers in the clinical setting.…”

A Review Grinding : Teknik dan Prinsip Dasar pada Pengolahan Material

“…Pada ketinggian tertentu bola-bola baja tersebut akan terjatuh akibat adanya gravitasi. Sehingga bola-bola baja akan menumbuk material atau bahan baku yang diolah dan menyebabkan ukuran material menjadi lebih kecil dari ukuran sebelumnya (74)(75)(76). Pada proses grinding partikel direduksi dari 5 sampai 250 mm menjadi 10 sampai 300 µm, grinding biasanya dilakukan pada kondisi basah untuk mendapatkan slurry yang akan diumpankan pada proses concentration (77)(78)(79)(80)(81)(82)…”