Abstract
Lingual orthodontics, among both young and adult patients, increased in popularity during last years. The purposes of the present investigation were to evaluate the shear bond strength (SBS) values and Adhesive Remnant Index (ARI) scores of different lingual brackets compared with a vestibular control bracket. One hundred bovine teeth were extracted and embedded in resin blocks. Four different lingual brackets (Idea, Leone; STB, Ormco; TTR, RMO; 2D, Forestadent) and a vestibular control bracket (Victory, 3M) were bonded to the bovine enamel surfaces and subsequently shear tested to failure utilizing a Universal Testing Machine. SBS values were measured. A microscopic evaluation was performed to obtain ARI scores. Statistical analysis was performed at a statistically significant level of p < 0.05 to determine significant differences in SBS values and ARI Scores. No statistically significant variations in SBS were reported among the different groups. Conversely, significant differences were shown in ARI scores among the various groups. Clinical relevance of the present study is that orthodontists can expect similar resistance to debonding forces from lingual appliances as with vestibular brackets.
Highlights
In recent years orthodontists have increasingly faced the problem of patients demanding treatment with more aesthetic appliances
The purposes of the present investigation were to evaluate the shear bond strength (SBS) values and Adhesive Remnant Index (ARI) scores of different lingual brackets compared with a vestibular control bracket
No significant variations in SBS values were reported among different vestibular and lingual brackets tested
Summary
In recent years orthodontists have increasingly faced the problem of patients demanding treatment with more aesthetic appliances. Lingual appliances allow the correction of tooth malposition through fixed therapeutic appliances attached to the lingual tooth surfaces [2]. This technique presents a significantly better aesthetic appearance if compared with conventional vestibular orthodontic treatment; lingual appliances are practically invisible. Recent studies demonstrated that lingual orthodontics could provide treatment outcomes similar to those achieved with labial appliances. Lingual appliances have been reported to cause additional problems when compared to conventional vestibular appliances such as restriction of mastication. Speech dysfunctions during pronunciation of some letters, and general oral discomfort have been reported [3,4,5,6,7]
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