Shear bond strength of precoated orthodontic brackets: an in vivo study

Abstract

ObjectiveTo evaluate the shear bond strength of precoated orthodontic brackets bonded with self-etching primer relative to that of noncoated conventionally-bonded brackets at two different time intervals.MethodsTwenty-one subjects were selected for randomized split-mouth bonding of two types of brackets to the maxillary arch. Half of the teeth had precoated brackets bonded using self-etching adhesive, and the other half had regular brackets bonded using Transbond XT adhesive. Nitinol wires were tied to the upper arch and were left until the time of debonding. The patients were randomly divided into two groups: one debonded after one hour and the other debonded two weeks after the initial wire placement. The shear bond strength was directly recorded from the patients’ mouths using an in vivo debonding device.ResultsThere were no significant differences in shear bond strength between the precoated and conventional groups or within each group at different time intervals. There were significant differences between anterior and posterior teeth in both the precoated and conventional groups.ConclusionPre-coated brackets bonded with self-etching adhesive have the same bonding strength as the conventionally bonded brackets.

Assessment of in vivo bond strength studies of the orthodontic bracket-adhesive system: A systematic review

“…Additional papers could not be found through hand searching. Among the six included studies, five of them were clinical trials[ 2 3 4 5 6 ] and only one study was a randomized clinical trial. [ 7 ] All the articles were published in English, except for one in Portuguese.…”

“…[ 1 ] it is presented in an additional file. According to the assessment, 5 of the studies scored 17 and above and rated as high-quality,[ 2 3 4 6 7 ] only one study scored 10 which is rated as lower quality. [ 5 ] The extracted data from each of the study are summarized in Table 3 .…”

Surface modification for bonding between amalgam and orthodontic brackets

“…We selected Transbond XT® as it is commonly used in SBS evaluation in orthodontics due to its high SBS. [ 8 20 21 22 23 24 ] Furthermore, it has the benefit of rapid polymerization under a light-cure system, which allows a more accurate bracket position. [ 25 ]…”

Comparación in vitro de la fuerza de adhesión sobre esmalte de brackets Clarity estándar (Transbond XT 3M) con los brackets Clarity APC Plus (3M), mediante una prueba de cizallamiento.

“…Existen brackets APC con mayor y otros con menor viscosidad; y su uso ya depende de la comodidad del ortodoncista. Por un lado, los brackets APC con más viscosidad (menos fluido), tienen como objetivo mejorar la adhesión entre la base del bracket y la superficie del esmalte durante las fases iniciales de la cementación (Hassan, 2010…”

“…Hassan, en su estudio in vivo, determinó que la fuerza adhesiva de los brackets APC combinados con un sistema adhesivo normal o con un sistema adhesivo SEP (Self-etching primer) es similar a la fuerza adhesiva generada por un bracket convencional. Estos datos apoyan el uso de los brackets APC como una alternativa ante los brackets convencionales, porque su adhesión al diente requiere menos pasos clínicos, y al mismo tiempo, tienen una fuerza adhesiva similar entre ellos(Hassan, 2010). En comparación con mi estudio, concuerdo más con los resultados obtenidos por Wong y Power y por Verstrynge et al, ya que no hay una disminución significativa de tiempo de trabajo con los brackets APC; sino únicamente una fuerza adhesiva similar entre ambos tipos de brackets.…”