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Register a new userStudy to compare shear bond strength of rebonded metal brackets which their bases are mechanically prepared.(In vitro study)
مقارنة مقاومة قوى القص للحاصرات المعدنية المعاد إلصاقها بعد تحضير قاعدتها بطريقة ميكانيكة (دراسة مخبرية)
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تهدف هذه الدراسة الى مقارنة مخبرية لقوى القص للحاصرات المعدنية المعاد الصاقها بعد تحضير سطحها بطريقة ميكانيكية. العينة مكونة من 40 ضاحك أول مقلوع حيث تم تقسيمها عشوائيا إلى مجموعتين كل منهما 20 سن بعد ذلك تمت إزالة الكومبوزيت المتبقي على سطح السن و قاعدة الحاصرة بواسطة تنغستينكاربايد و إعادة إلصاقها و من ثم تم تقييم قوى القص للحاصرات المعاد إلصاقها لنفس العينة بواسطة جهاز KN)6)tecnotest بسرعة 1مم/دقيقة أظهرت النتائج أن متوسط قيمة قوى القص بالنسبة للكومبوزيت Reselience كانت (19.25) ميغا باسكال بينما كان متوسط قوى القص للكومبوزيت Heliosit (10.25), كما وجدنا ان متوسط قيمة قوى القص عند إعادة الإلصاق بالنسبة للكومبوزيت Reselience كانت (13.70) و كانت بالنسبة للكومبوزيت Heliosit (7.95) حيث أظهر اختبار تي ستيودنت وجود علاقة هامة احصائيا بين الالصاق الأولي و إعادة الإلصاق. كما لاحظنا ان هناك فروقات ذات دلالة إحصائية بين قوى الإلصاق الأولي و إعادة الإلصاق بالنسبة للكومبوزيت Reselience, بينما لم نجد فروقات ذات دلالة إحصائية بين قوى الإلصاق الأولي و إعادة الإلصاق بالنسبة للكومبوزيت Heliosit.
The aim of this study To compare in vitro shear bond strength (SBS) of different orthodontic adhesives in and rebonding metal brackets after preparing their bases mechanically. Material and methods:Sample consisted of 40 extracted first premolars, randomly divided into two groups (n=20),.Adhesive removed by tungsten carbide bur later the brackets were rebonded. The tests were performed in a tecnotest (6kN) SBS testing machine, at a speed of 1 mm/min. It was found that the mean shear bond strength of Reseliencewas 19.25 MPa and that of Heliosit orthodontic was 10.25MPa.We foundthat the mean shear bond strength of rebonding forReselience was 13.70 and 7.95 forHeliosit.The t-test revealed that there was a significant difference between the shear bond strength of the two groups. We found a significant difference between bonding and rebondingfor Reselience,while there was no significant difference between bonding and rebonding for Heliosit.
References used
AASRUM E, NG’ANG’A PM, DAHM S, OGAARD B. Tensile bond strength of orthodontic brackets bonded with a fluoridereleasing light-curing adhesive. An in vitro comparative study. Am J OrthodDentofacialOrthop. 1993;104:48-50
ANTONIADOU M, KERN M, STRUB JR. Effect of a new metal primer on the bond strength between a resin cement and two high‑noble alloys. J Prosthet Dent 2000;84:554‑60
BISHARA SE, AJLUNI R, LAFFON JF, WARREN JJ. Effect of fluoridereleasing self-etching acidic primer on the shear bond strength of orthodontic brackets. Angel Orthod 2002;72:199-02
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Background
Resin bonded fixed partial dentures appeared to prevent the excessive preparation of dental
tissue
Investigation of surface treatments to improve the bond of resin cements to metals may contribute
to the longevity of these restoration
s. Due to the potential lack of ideal preparation form the type of alloy
and its surface pretreatment may have clinically relevant correlations with the retentive strength of castings
to minimally retentive preparations
Aim
The aim of this search is to study the bonding resin cement strength to different types of the metal
alloy due to the surface treatment
Purpose Evaluate the effects of two different surface treatments on shear bond strength SBS between a
palladium silver alloy Pb Ag and commercially pure titanium CP Ti cast alloy with resin luting cements
metal type
تأثير نوع المعدن
ومعاملة السطح على مقاومة القص لارتباط الإسمنت الراتنجي
الإسمنت الراتنجي
shear bond strength of resin
خليطة بلاديوم
فضة ( Pb-Ag)
التيتانيوم النقي تجاريا (CP Ti)
المهيئ المعدني (MZP)
Commercially pure titanium
metal zirconia primer
palladium‑silver alloy
resin cement
sandblasting
المزيد..
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 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.
The research aims to evaluate the micro shear bond strength of the calcium silicate cement
(Biodentine) and the glass ionomer cement (GIC) to dentine. The study was performed using
upper or lower premolars, and samples were divided into six equal s
ubgroups according to
the time period (3 h, 1 day, 1 week, 2 weeks, 4 weeks, 8 weeks), in order to study changes in
the values of shear bond strength with time. The comparative study showed that the success
rate of adhesion in the Biodentine group was smaller than that in the GIC group for the tested
premolars after 3 hours and one day, whereas the success rate in the Biodentine group was
greater than that in the GIC group for the tested premolars after 8 weeks.
Results showed a positive correlation between the mean values of shear bond strengths and
the studied time in Biodentine group, which ranged from 1.49 ± 0.18 MPa at 3 hours to a
maximum value of 2.65 ± 0.26 MPa after 8 weeks. While there was a negative correlation
between the mean values and the studied time in the GIC group and values ranged from 3.02
± 0.13 MPa at 3 hours and 2.06 ± 0.09 MPa at 8 weeks.
The study showed the advantage of Biodentine compared with GIC in terms of
micro-bonding to dentine, which can have a clinically significant importance in preventing
the micro leakage and reducing bacterial contamination.
to evaluate the shear bond strength(SBS) of a composite resin repair system to
zirconia-ceramic with and without water storage and thermo-cycling (WSTC).
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