Publications (28) View all
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Article: A novel biomimetic orthodontic bonding agent helps prevent white spot lesions adjacent to brackets.
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ABSTRACT: Abstract Objective: To compare changes in enamel microhardness adjacent to orthodontic brackets after using bonding agents containing various compositions of bioactive glass compared to a traditional resin adhesive following a simulated caries challenge. Materials and Methods: Extracted human third molars (n = 10 per group) had orthodontic brackets bonded using one of four novel bioactive glass (BAG)-containing orthodontic bonding agents (BAG-Bonds) or commercially available Transbond-XT. The four new adhesives contained BAG in varying percentages incorporated into a traditional resin monomer mixture. Teeth were cycled through low-pH demineralizing and physiologic-pH remineralizing solutions once each day over 14 days. Microhardness was measured on longitudinal sections of the teeth 100, 200, and 300 µm from the bracket edge and beneath the brackets, at depths of 25 to 200 µm from the enamel surface. Normalized hardness values were compared using three-way analysis of variance. Results: Significantly less reduction in enamel microhardness was found with the experimental adhesives at depths of 25 and 50 µm at all distances from the bracket edge. In all groups, there were no significant changes in enamel microhardness past 125-µm depth. Results varied with the different BAG-Bonds, with 81BAG-Bond showing the smallest decrease in enamel microhardness. Conclusions: The BAG-Bonds tested in this study showed a reduction in the amount of superficial enamel softening surrounding orthodontic brackets compared to a traditional bonding agent. The results indicate that clinically, BAG-Bonds may aid in maintaining enamel surface hardness, therefore helping prevent white spot lesions adjacent to orthodontic brackets.The Angle Orthodontist 06/2012; · 1.21 Impact Factor -
SourceAvailable from: Steven Lindauer
Article: Self-ligating vs conventional brackets as perceived by orthodontists.
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ABSTRACT: Abstract Objective: To determine if there are significant clinical differences between self-ligating brackets (SLB) and conventional brackets (CB) during orthodontic treatment, as perceived by orthodontists. Materials and Methods: A survey was developed and distributed to evaluate how SLB compare to CB in terms of orthodontists' perceptions (n = 430). Results: SLB were preferred during the initial stage of treatment based on the shorter adjustment appointments and faster initial treatment progress they provided (P < .0001). On the other hand, practitioners preferred CB during the finishing and detailing stages of treatment (P < .0001). CB were also preferred over SLB because they were cheaper and resulted in fewer emergency appointments. Conclusions: The orthodontists' preference was significantly influenced by (1) the proportion of patients treated with SLB (P < .0001), (2) the number of cases it took them to become accustomed to SLB (P < .0001), and (3) the average appointment intervals associated with SLB (P < .0001).The Angle Orthodontist 03/2012; · 1.21 Impact Factor -
Article: Perceptions of soft tissue laser use in orthodontics.
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ABSTRACT: To compare attitudes of orthodontists, periodontists, and general dentists regarding the use of soft tissue lasers by orthodontists during the course of orthodontic treatment. An analogous survey was developed to evaluate and compare the current opinions of a representative sample (n = 538) of orthodontists (61.3%), periodontists (24.3%), and general dentists (14.3%) regarding orthodontists' use of soft tissue lasers. The majority (84%) of orthodontists, periodontists, and general dentists regarded the use of a soft tissue laser by orthodontists as appropriate. When compared to orthodontists and general dentists, a lower percentage of periodontists indicated that soft tissue laser use by orthodontists was appropriate (P < .01). For each of the eight specific soft tissue laser procedures investigated, periodontists reported a significantly lower level of appropriateness than did orthodontists and general dentists (P < .01). Around 75% of the total sample believed that referral would not be affected by the use of soft tissue lasers by orthodontists. Orthodontists, periodontists, and general dentists differed in their opinions of the perceived appropriateness of soft tissue laser use by orthodontists, with periodontists reporting a lower level of appropriateness. Clinicians need to communicate effectively to ensure that orthodontic patients in need of adjunctive soft tissue surgery are treated to the accepted standard of care.The Angle Orthodontist 01/2012; 82(1):75-83. · 1.21 Impact Factor -
Article: Ion release from a novel orthodontic resin bonding agent for the reduction and/or prevention of white spot lesions. An in vitro study.
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ABSTRACT: To measure ion release from four sol-gel bioactive glass-containing orthodontic resin bonding agents (BAG-Bonds) following immersion into simulated body fluid (SBF) at pH values of 4 and 7. Four BAG-Bonds, two containing fluoride, were developed. Prepared in our laboratory, the BAG-Bonds were composed of a mixture of resin monomers and bioactive glasses (BAGs). Workability of the final BAG-Bonds determined the amount of filler added to each, and this varied according to BAG composition. Commercially available Transbond-XT was used as the control. Three disks (10 mm × 2 mm) of each material were individually suspended in 3.5 mL of SBF at pH 4 and pH 7. SBF was analyzed to measure pH and ions released at 1 hour, 10 hours, and 100 hours. Calcium was measured by atomic absorption analysis, phosphate by ultraviolet visible spectrometry, and fluoride by an ion-specific electrode. The data were compared using a three-way analysis of variance, with P ≤ .05. Significant differences in calcium and phosphate ion release were found between the four BAG-Bonds and the control at multiple time points. Significant changes in pH were also found. There was no measureable release of fluoride from any of the materials. The BAG-Bonds showed the capacity for buffering acidic oral environments and significant release of calcium ions into their surrounding environment, and they hold the potential to be biomimetic bonding agents that may reduce white spot lesion formation.The Angle Orthodontist 11/2011; 81(6):1014-20. · 1.21 Impact Factor -
Article: Influence of dental esthetics on social perceptions of adolescents judged by peers.
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ABSTRACT: The relationship between physical appearance and social attractiveness is well established in the literature. The purpose of this study was to determine whether dental esthetics influenced the perceptions of teens when judging a peer's athletic, social, leadership, and academic abilities. The frontal-face smiling photographs of 10 teenage volunteers were each altered to create 1 image with an ideal arrangement of teeth and 1 with a nonideal arrangement. Two parallel surveys were constructed with 1 photo displaying either an ideal or a nonideal smile image of each subject. If the ideal smile image appeared in 1 survey, then the nonideal smile appeared in the other. Two hundred twenty-one peer evaluators successfully rated the pictures in 1 of the surveys by indicating their perception of each subject's athletic, social, leadership, and academic abilities. The subjects' photographs with ideal smile esthetics were consistently rated higher on average than the same subjects' images with nonideal smile esthetics. The differences in ratings between ideal and nonideal smiles were significant for perceptions of athletic performance (P = 0.0141), popularity (P <0.0001), and leadership ability (P <0.0001), but not for academic performance (P = 0.0548). On average, ratings for the ideal smiles in perceived athletic, social, and leadership skills were about 10% higher than those given for images with nonideal smiles. Based on these findings, it would be expected that orthodontic treatment resulting in improved smile esthetics can provide modest social benefits for adolescent patients.American journal of orthodontics and dentofacial orthopedics: official publication of the American Association of Orthodontists, its constituent societies, and the American Board of Orthodontics 09/2011; 140(3):389-95. · 1.33 Impact Factor
