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Register a new userShear Bond Strength of Orthodontic Brackets Following Er-YAG versus Nd-YAG Laser Etching: A laboratory Study
مقارنة قوة الارتباط المقاومة للقص للحاصرات التقويمية الملصقة بعد التخريش بليزر Er-YAG و ليزر Nd-YAG "دراسة مخبرية"
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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 و ليزر Nd-YAG, إذ تم جمع (ثمانين) ضاحكة "علوية" مقلوعة "حديثا", قسمت لمجموعتين متساويتين عشوائيا, الأولى تم تخريش سطحها الدهليزي بليزر Er-YAG و الثانية بليزرNd-YAG, و كل 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 و مجموعة 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.
References used
SMITH, RT; SHIVAPUIA, RK. The revaluation of dual cement resins in orthodontic bonding. Am J Orthod Dentofacial Othop 1993, 103:448-51
SURMONT,P; DERMAUT,L; MARTENS,L; MOORS, M. Comparison in shear bond strength of orthodontic brackets between four bonding systems related to different etching times: An in vitro study. Am J Orthod Dentofacial Orthop 1992, 101:414-9
HOBSON, RS; MCCUBE, JF; HOGG, SD. The effect of food stimulants on enamel – composite bond strength. Br J Orthod 2000, 27:55-9
BRANTLEY, W; Eliades, T . Orthodontic materials :Scientific and clinical aspects .Thieme Stuttgart , New York 2001 , ch 5:107-22
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This study aimed to compare the effects of different enamel
etching techniques for bracket bonding strength. The sample
consisted of eighty human premolars were randomly divided into
four equal groups. The enamel surfaces of the teeth were etched
with 35% orthophosphoric acid in Group 1 , air abraded with
50 μm aluminum oxide prior to acid etching in Group 2, Trans
bond Plus Self-etching Primer (TPSEP) in Group 3 , Er: YAG
laser in Group 4. After enamel etching procedures, brackets were
bonded with Trans bond XT , then shear bonding test was
performed using a testing machine (Tinius Olsen).
With the increase in the number of adult patients seeking orthodontic treatment, the need to ensure sufficient bonding strength for the fixed orthodontic components on the ceramic restorations has become an urgent matter. Adhesion of the orthodontic
bracket is an essential and indispensable step.
The of this study was to evaluate the bonding strength of a
posterior composite restorations when two different types of
equipment methods were used for preparation of dentin (Erbium-doped
yttrium aluminum garnet laser (Er:YAG ) and diamond burs).
This study specimen consisted of Eighty molars, was divided
randomly into two main groups (40 molars were prepared with
diamond burs, and 40 molars were prepared with laser Er: YAG).
The aim of this study was to compare the pain and the time
consumed during surgical extraction of the impacted lower
third molars using Er:YAG laser and surgical burs. The study
included 40 impacted molar existed in 20 patients (11male +
9 female
) who had two symmetric impacted lower molars. The
time consumed during the extraction was measured and the
pain was observed during one, three and seven days after the
surgical operation. After that the data were statistically
studied. As a result of this study, the mean of the time
consumed in bone removal was (9.5) minutes using surgical
burs and (15.7) minutes using Er:YAG laser. So there was
significant difference between the two methods. There was no
significant difference in pain between the two methods during
the three observation periods. Based on the results of this
study, the use of Er:YAG laser as an alternative method to
the surgical burs is possible but it consumes a lot of time
during bone removal.
The purpose of this study was to evaluate the shear and tensile bond strengths of orthodontic
brackets bonded with self etching primer and resin-reinforced glass ionomer cement in comparison with
light cured resin adhesive.
The tested self-etching
primer and adhesive systems produced bond strength values higher than that of the light cured resin
adhesive whereas the resin-reinforced glass ionomer cement showed a significantly reduced bond strength
. Clinically, the use of self-etching primer and adhesive systems is suitable for orthodontic bracket
bonding.
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