Structural variations in the surface zone of human tooth enamel observed by scanning electron microscopy

Long-Term Evaluation of Clinical Performance of Directbonded Brackets: An Epidemiologic Survey

“…Difficulty of reaching the buccal surfaces of these teeth and subsequent moisture contamination, presence of aprismatic enamel 14 and also premature occlusal contacts can be listed on the etiology of this finding. In the current study lower incisors had the second highest debonding incidents after second premolar teeth.…”

Micro-shear Bond Strength of Two All-in-one Adhesive Systems to Unground Fluorosed Enamel

“…It should be mentioned that the presence of a surface aprismatic layer in unground enamel was less conducive to bonding 23,24) . The resin-enamel bond in this study was thus attributed to the underlying layer of hybrid-like enamel tissue 25,26) .…”

Relationship between enamel etch characteristics and resin-enamel bond strength

“…Whittaker 7 found that the extent of aprismatic enamel increased on posterior teeth in comparison with anterior teeth and he proposed that this may affect the acid etch procedure prior to bonding and hence bond strength and survival. A number of authors have supported this view that aprismatic enamel on the buccal surface may affect bond failure.…”

“…20,21,22 One curious finding of the current study that is difficult to explain is the discrepancy between the poor quality of etch on the lower first molar and its large bond strength and vice versa with the upper first molar. Published work 6,7,18 indicates that the etch pattern is poorly defined on lower first molars and therefore that bond strength should be low. However, in the current study it was found to be significantly higher than for any other tooth, suggesting that the quality of etch does not influence bond strength.…”

“…5 They all reported that there are variations in both the quality and quantity of etched enamel on the tooth surface. Gwinnett 6 and Whittaker 7 proposed that the presence of aprismatic enamel may limit the development of the etch pattern; the resulting reduction in resin penetration contributing to a weaker bond strength, although the study did not demonstrate this effect.…”