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Bond strength to etched and Re-etched enamel, dentin and dentino-enamel junction

Authors: Dr. Maha Adnan Habeeb. د.مها عدنان --- Dr. Angham Ghiyath Al-Hashimi B.D.S, M.Sc. د. انغام غياث
Journal: MUSTANSIRIA DENTAL JOURNAL مجلة المستنصرية لطب الاسنان ISSN: 18138500 Year: 2011 Volume: 8 Issue: 2 Pages: 100-105
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Etching and re-etching are frequently done technique to alter the tooth surface andmakes it more receptive to adhesion. This study was done to assess the effect of reetchingtechnique on bond strength to enamel, dentin and dentino-enamel junction.60 extracted human upper premolars teeth were collected cleaned, sectioned at thelevel of cervical line, embedded in acrylic block exposing certain grounded flatsurface of the crown and divided into 2 groups:Group A (30 etched specimens) etched with total etch (37% phosphoric acid)for 15 sec.Group B (30 re-etched specimens) etched and re-etched with total etch(37% phosphoric acid).Both groups were subdivided into:Subgroup 1 10 enamel specimensSubgroup 2 10 dentin specimensSubgroup 3 10 dentino-enamel junction specimensA standardized cylinders of light cure composite resin were bonded, and thespecimens were stored in deionized distilled water for 24 h. and testing was done withzwick test machine and statistically analyzed using analysis of variance test(ANOVA) and student t-test.The results showed non significant difference between all subgroups in groupA(etching group) and between all subgroups in group A Vs. group B subgroup 2(reetchedE), and showed a significant difference between all subgroups in group A Vsgroup B subgroup 3 (re- etched EDJ) and between group B sub1&2 (re-etched E & D)Vs group B sub 3 ( re-etched DEJ) ,furthermore there were a highly significantdifferences between all subgroups in group A Vs group B sub 2(re-etched D) andbetween group B sub 2(re-etched E) Vs groupB sub 2(re-etched D).Re-etching the enamel didn’t decrease the shear bond while re-etching dentinmarkedly decreased the bond strength. Further more re-etching the dentino-enameljunction lies in between.


Article
Evaluation of enamel surface damage after debonding using three different pliers "An in vitro study"

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Abstract

AbstractThis study aims to compare the effectiveness of three different pliers in debondingstainless steel and ceramic brackets, also to evaluate enamel surface damage and thesite of bond failure after debonding.Sixty premolars, extracted for orthodontic purposes, were divided into 3 groups of20. The enamel surfaces were examined with 10X magnifying lens. Two types ofbracket (stainless steel and ceramic) was bonded and debonded in each group using:conventional debonding pliers, bracket removal pliers, and ligature wire cutter. Afterdebonding, the enamel surfaces were inspected under a stereomicroscope to determinethe predominant site of bond failure. Then stereomicroscope was used to evaluateenamel surface damage after the removal of residual adhesive.The enamel surface damage showed a statistically significant difference in ceramicbracket groups, whereas, it was statistically insignificant in stainless steel bracketgroups. The amount of the adhesive remained on the tooth surface was statisticallyinsignificant in both stainless steel and ceramic bracket groups. The predominantfailure site was within the adhesive itself for both types of brackets.The enamel surface damage that results from debonding of ceramic brackets washigher than that found with the stainless steel brackets especially with the use ofbracket removal pliers "used in this study"


Article
Caries-experience, dental wearing and enamel developmental defect among autistic children aged 4-6 years
صحة الفم والاسنان عند مرضى التوحد للاعمار من 4 – 16

Author: Nadia A Al-Rawi د. نادية عفتان الراوي
Journal: IRAQI JOURNALOF COMMUNITY MEDICINE المجلة العراقية لطب المجتمع ISSN: 16845382 Year: 2011 Volume: 24 Issue: 1 Pages: 52-55
Publisher: Al-Mustansyriah University الجامعة المستنصرية

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Abstract

Background: Autism is developmental disorders characterized by severe defects in social interaction and communication. A wide spectrum of medical and behavioral symptoms is exhibited by children with autism, which make routine dental care very difficult in them.Aims of this study: This study conducted to investigate the caries-experience, tooth wearing, in addition to developmental deformity of enamel among autistic children, in comparison to normal non autistic children.Subjects, materials & methods: The study group included 43 autistic children, with an age range of 4-16 years. They were with confirmed diagnosis of autism. Children were divided into three groups according to the severity of the disease. The control group included 43 children matching with age and gender. Assessment and recording of caries — experience were through the application of decayed. Missing and filled teeth index (DMTT&dmft) WHO (1987), tooth wearing was recording according to Smith index (1984), and developmental deformity of enamel was recorded according to Modified Developmental Defect of Enamel index (DDE) (1989).Results: A low level of dental caries was seen among autistic groups compared to the control, with differences were statistically highly significant in primary and permanent dentition. High mean values were recorded concerning teeth wearing (both dentition) among the severe autistic group compared with non autistic children with statistically highly significant difference. No developmental deformity of enamel was recorded among autistic and normal children.Conclusions: Increase values of teeth wearing with low level of caries - experience was recorded among autistic children compared to healthy children.Key words: Autism, dental caries, teeth wearing, enamel developmental defect.

الهدف: التوحد يتصف باضطرابات النمو مع صعوبة التفاعت الاجتماعي. ايضا يتصف بمدى واسع باعراض طبية وسلوكية خاصة , مما يجعت العناية والفحص للفم والاسنان شديدة الصعوبة.ان اهداف هذه الدراسة تحديد شدة التسوس مع شدة احتكاك سطح السن , بالاضافة الى تحديد خلل نمو طبقة المينا عند اطفال التوحد مع مقارنتهم باطفال اصحاء .تم فحص 43 طفت يعانون من اضطرابات التوحد للاعمار من 4 – 16 سنة , قسموا الى مجموعتين استنادا شدة المرض , مع مقارنتهم باطفال اصحاء مطابقين لهم بالعمر والجنس .تم تحديد شدة التسوس من خلال المقياس (dmfs, DMFS) , مع قياس هحتكاك اسطح الاسنان , بالاضافة الى قياس خلل نمو طبقة المينا.النتائج: اظهرت النتائج ان التسوس كان قليلا عند اطفال مرضى التوحد مقارنة مع الاطفال الاصحاء المفحوصين, مع وجود علاقة معنوية عالية .سجلت النتائج قيمة معنوية عالية عند اطغال التوحد (شديدي التوحد) بما يتعلق بشدة احتكاك اسطح الاسنان مقارنة مع الاصحاء , مع وجود علاقة معنوية عالية . لم تظهر النتائج اي خلل في نمو طبقة المينا عند جميع الاطفال المفحوصين .الاستنتاج: للحصول على نتائج اوسع بما يتعلق بصحة الفم والاسنان وما يتعلق بشدة النمو والتسوس , نحتاج الى عينات اكبر من المصابين , مع الحصول على نتائج تحليلية للعاب.

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