Fulya Isik

Vertical growth changes after adenoidectomy.

The purpose of this retrospective investigation is to compare vertical growth component of craniofacial structure of subjects with early and late adenoidectomy history. The study consisted of 93 lateral cephalometric radiographs of three groups of randomly selected patients. The first group was made up of 12 patients (10 male and two female) with an average age of 11.16 +/- 2.08 years, who had been operated upon between 1.5-4 years of age. The second group was made up of 54 patients (25 maleand 29 female) with an average age of 12.18 +/- 2.6 years, who had been operated upon after four years of age. The third group of 27 patients (7 male and 20 female) with clear airway with an average age of 11.18 +/- 2.35 years was used as the control. The data obtained from two adenoidectomy groups were compared and because no statistically significant difference was found except for ANSMe/NMe, the two groups were pooled and compared with the growth pattern in the control sample. There were statistically significant differences in the following parameters: SNGoMe, PPGoMe angle, Gonial angle, Gonial ratio, sigma of inner angles, ANSMe/NMe ratio, Jarabak ratio, PNS-adl distance, PNS-ad2 distance, OAW1 distance. When compared with the control group, the adenoidectomy group showed a more vertically directed growth pattern, however, there were no vertical growth pattern differences between the two groups of children who had adenoidectomy before and after four years of age.

Light Curing the Primer—Beneficial When Working in Problem Areas?

The purpose of this study was to investigate whether Transbond XT with MIP and Assure were affected by light curing the primers before contamination with blood or saliva. The study material consisted of 180 human premolars. The teeth were assigned into 12 groups of 15 specimens each. Metal brackets were bonded to each tooth under five different enamel surface conditions: dry, contaminated with blood or contaminated with saliva after primer application without light curing the primer, and contaminated with blood or contaminated with saliva after primer application with light curing the primer. The shear bond strengths of the two adhesive groups were not significantly different from each other within the same surface condition. There was no statistically significant difference between the groups bonded under dry conditions. On the other hand, curing the primer before adhesive application enhanced the bond strength in the contamination groups. Saliva and blood behaved similarly, showing higher bond strength values when the primer was light cured before contamination. However, they revealed bond strengths of different magnitudes because of the differences in the type and amount of inorganic and organic substances they contained. Under ideal conditions, light curing the primer did not introduce any advantages. However, curing the primer before contamination revealed higher bond strengths. To minimize the negative effect of contamination on bond strength, it would be appropriate for clinicians to light cure immediately after the application of the primer.

New Protective Polish Effects on Shear Bond Strength of Brackets

One of the solutions for the problem of white spot lesions has been the application of a polymer coating to the labial enamel surface. The aim of this study is to find out whether the liquid polish BisCover affects the bond strength of brackets bonded with a light-cured system (Transbond XT) and a no-mix system (Unite). Standard stainless steel premolar brackets were bonded to 100 permanent human premolars randomly divided into five equal groups. Two different enamel surface conditions were studied: dry and varnished with BisCover. For each enamel surface condition, two orthodontic adhesive systems were used: a light-cured system (Transbond XT) and a no-mix system (Unite). All teeth were conditioned with 37% phosphoric acid for 30 seconds, followed by thorough washing and drying. The teeth in groups 1 and 2 were bonded with Transbond XT and Unite, respectively. For groups 3, 4, and 5, a thin layer of BisCover was applied to the etched enamel with a brush and light cured for 15 seconds. In group 3, a thin layer of Transbond XT primer was applied, whereas in group 5, no additional primer was used on BisCover. In groups 3 and 5, the brackets were bonded with Transbond XT adhesive resin. Group 4 was bonded with no-mix Unite. Shear forces were applied to the samples by a Zwick Universal test machine, and bond strengths measured in megapascals. The results revealed that shear bond strengths of the groups did not differ significantly from each other.