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An evaluation of three fissure sealants microleakage with presence or absence of bonding agent through time intervals (In vitro study)

Authors: Ali M. El-mosawi علي الموسوي --- Wesal A. Al-Obaidi وصال العبيدي
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2013 Volume: 25 Issue: 1 Pages: 181-187
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: Pit and fissure sealant have been considered an outstanding adjunct to oral health care in thedecrease of occlusal caries onset and low progression. The aims of this in vitro study were to evaluate the marginalmicroleakage of three different types of fissure sealants (SDI, Tg and tetric N-flow) by time interval, one day and 45days, in the presence or absence of bonding agent among maxillary and mandibular teeth.Materials and methods: Seventy two sound human maxillary and mandibular first premolar teeth were collectedwhich were free from obvious carious lesions. The teeth were randomly divided into two main equal groups, group (1)and group (2), each group consists of (36) teeth involving equal numbers of maxillary and mandibular teeth. The firstgroup incubated for one day, the second incubated for (45) days. Each group divided into two subgroup; one ofthem treated with bonding agent while the other without. Then each subgroup was treated with three differentmaterials which were; Tg sealant (without fluoride) group (A), SDI sealant (containing fluoride) group (B) and Tetric Nflow(flowable composite) group (C). Each one consist of six teeth involving three maxillary and three mandibular.Then dye penetration tested by using methylene blue dye, then the teeth cleaned and sectioned by sectioningdevice and tested under microscope.Results, the results had shown that, group (C+) in both incubation periods have no microleakage (score 0), but therewas an opposite effect when using bonding agent with sealant materials not containing filler particles that showed asignificant increase in the microleakage rate as shown in groups (A+ and B+). The opposite effect was seen alsowhen used sealant materials containing filler particles but without bonding agent that seen in group (C) during bothincubation periods that showed significant increasing in microleakage rate. While the effect of fluoride was veryclear in decreasing significantly the microleakage rate after (45) days of incubation in both groups that treated withand without bonding agent (groups B and B+). Concerning the anatomical variation, there were no significantchanges in most groups regarding the microleakage rate.Conclusions: Results had shown that the microleakage can be prevented by using of flowable composite containingnanofillers that treated with bonding agent after etching of enamel with 35% phosphoric acid gel


Article
The Influence of Caries Infiltrant Combined with and without Conventional Adhesives on Sealing of Sound Enamel (In Vitro Study)

Authors: Marwa Balasim مروة بلاسم --- Dhiaa J. N. Al-Dabagh ضياء جعفر الدباغ
Journal: Journal of baghdad college of dentistry مجلة كلية طب الاسنان بغداد ISSN: 16800087 Year: 2016 Volume: 28 Issue: 2 Pages: 119-125
Publisher: Baghdad University جامعة بغداد

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Abstract

Background: The formation of white spot lesions around fixed orthodontic attachments is a common complicationduring and after fixed orthodontic treatment, which hinders the result of a successfully completed orthodontictreatment. The aim of the study was to assess the effectiveness of the Caries Infiltrant (ICON®) on prevention of carieson the smooth enamel surface when applied alone or combined with conventional adhesives.Materials and methods: Seventy eight human premolar enamel discs were randomly assigned to six groups (n=13).The discs were etched and treated with resins of different monomer content forming the following groups:(1)Untreated etched samples served as the negative control, (2) ICON® (DMG), (3) Adper™ SB 2 (3M ESPE), (4)Heliobond (IvoclarVivadent), (5) ICON®+ Adper™ SB 2 and (6) ICON®+ Heliobond. Specimens were subjected todemineralization by immersion in hydrochloric acid (pH 2.6) for 18 days. Calcium dissolution into the acid wasassessed by photometric test via spectrophotometer at 24 hour intervals.Results: The results revealed that, there was a highly significant difference between the sealed groups and theunsealed (untreated) one (p≤0.00) indicating that the unsealed specimens showed the highest amount of Ca ion lossamong all other groups. Additionally, there was no significant difference between untreated specimens and theICON® sealed ones. While, Heliobond decreased the Ca ion loss significantly compared to the untreated specimensand Adper™ SB 2 performed significantly better than both ICON® and Heliobond. Furthermore, the combination ofICON® with either Adper™ SB 2 or Heliobond served as the best protective measures and maintained the protectiveeffect during the whole experiment period. Therefore, within the limitations of this in vitro study, it could beconcluded that the use of Caries Infiltrant prior to the application of the tested conventional adhesives increasestheir protective effect against demineralization.

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