مقارنة قوة الارتباط المقاومة للقص للحاصرات التقويمية الملصقة بعد التخريش بليزر Er-YAG وليزر Nd-YAG "دراسة مخبرية"
Abstract
استُخدم الليزر بوصفه طريقة فعالة لتخريش سطح الميناء لتهيئته لإلصاق الحاصرات التقويمية عليه بديلاً من حمض الفوسفور بسبب المخاطر الناجمة عن استخدام الحمض. تهدف الدراسة إلى مقارنة قوة الارتباط المقاومة للقص(جهد القص) للحاصرات التقويمية الملصقة بعد التخريش بليزر Er-YAG وليزر Nd-YAG, إذ تم جمع (ثمانين) ضاحكة" علوية" مقلوعة" حديثا", قسمت لمجموعتين متساويتين عشوائيا", الأولى تم تخريش سطحها الدهليزي بليزر Er-YAG والثانية بليزرNd-YAG, وكل مجموعة من المجموعتين الرئيستين قسمت لمجموعتين فرعيتين متساويتين وفقاً لنوع الإلصاق المستخدم (كيميائي، ضوئي). تم إجراء الاختبار الميكانيكي باستخدام جهاز الاختبار القياسي.Instron لم تظهر النتائج فروقاً ذات دلالة احصائية في متوسط قيم قوة الارتباط المقاومة للقص (بالميغاباسكال) بين مجموعة التخريش بليزر Er-YAG ومجموعة التخريش بليزر Nd-YAG.
The laser has been used as an alternative effective method of etching enamel surface for direct bonding of orthodontic brackets instead of phosphoric acid. The aim of this study was to compare shear bond strength of orthodontic brackets following Er-YAG versus Nd-YAG Laser etching. Eighty human extracted upper premolars were collected and divided randomly into two equal groups; the buccal enamel surface of the first group was etched by Er-YAG laser while the second group was etched by Nd-YAG laser. Each group was divided into two equal subgroups according to the bonding material type (chemical cure resin or light cure resin). The mechanical test has occurred by using a universal testing machine (Instron). The finding showed that no statistically significant differences in mean of shear bond strength between (Nd-YAG, Er-YAG) Laser etching group were found regardless of the bonding type.
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