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BACKGROUND:The association between maxillary development and vector relationships is used in the field of plastic surgery, but the validity of this principle has not been tested yet.AIM:The aim of this study is to determine whether visual classification of anterior malar projection using vector relationships is supported by cephalometric analysis.MATERIALS AND METHODS:Normal, healthy 40 subjects aged 10–15 years with no history of orthodontic treatment, craniofacial syndromes, or trauma formed the study group. These subjects based on the visual assessment of vector relationship (positive and negative) were divided into 2 groups (Group A and Group B), consisting of 20 subjects each. Vectors were drawn on the profile photographs. Sella–Nasion–Orbitale (SNO) angle were traced using the Nemoceph software. The relationship of anterior malar projection obtained from profile photograph and lateral cephalogram were compared. The data obtained were subjected to statistical analysis.RESULTS:Skeletal differences between the positive and negative vector groups based on SNO angles were statistically significant (P < 0.001). SNO angulations in the negative vector group were smaller than the positive vector group by an average of 5.9°.CONCLUSIONS:Visual assessment of vector relationship can be effectively used to classify anterior malar projection. This also helps in diagnosing maxillary hypoplasia and executes different treatment modalities.

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Objective: This study was conducted to compare the shear bond strength of brackets bonded with the conventional technique, transillumination technique and the combination of both the techniques; the effect of curing time on the bond strength of the brackets bonded with the transillumination method; and the amount of light passing through different thickness of teeth. Materials and methods:The study was conducted in vitro on 175 extracted human teeth (50 incisors and 125 premolars). In the first part of the study, the amount of light passing through different thickness of teeth was studied and, for second part, brackets were bonded with transillumination method and conventional method followed by shear bond strength testing using an instron machine. Results:The amount of light passing through the tooth depends on the thickness of the tooth. Only a small fraction of the original light intensity passes through the tooth but this is adequate to achieve clinically acceptable bond strengths.The bond strength achieved with transillumination method is comparable to the conventional light cure technique. Ten seconds of transillumination followed by conventional curing leads to an increase in bond strength and this increase is clinically significant. Conclusion:Transillumination technique is a viable method for bonding orthodontic attachments.