The Effect Of Different Dental Adhesive Systems On Hybrid Layer Qualities

The study aimed to evaluate the quality of the hybridlayer form by three different adhesive systems. Class Vcavities were prepared on the buccal surface of fourtyextracted human premolars. The prepared teeth wererandomly assigned into four groups according to theadhesive system and application mode. The systemswere: Optibond S (OS, total-etch); Optibond Versa (OV,two-bottles, self-etch); Single Bond Universal (SBU,one-bottle, self-etch) and Single Bond Universal withetchant (SBU + etchant). All cavities were restored withcomposite (Filtek Z350XT). The samples were sectioned,polished and pretreated to remove minerals, proteinand water prior to SEM evaluation. From the images,thickness of the hybrid layers was measured. Present ofresin tags and adaptation failure were also recorded. Thedata obtained were analyzed using ANOVA, Dunnett’sT3, Kruskal-Wallis and Mann-Whitney tests. OS groupshowed the highest average hybrid layer thickness (4.34µm), followed by SBU + etchant (3.06 µm), OV (1.91 µm)and SBU (0.95 µm). Both adhesive and cohesive failureswere observed in SBU group. Present of prominent resintags were seen in both OS and OV groups. In conclusion,all the investigated adhesive systems were able to performdistinguishable actions as shown in micro-morphologicalalteration and hybrid layer thickness. Two-bottles, selfetchadhesive (OV) was proven to produce negligibleadaptation failure compared to other adhesive systems inthe present study. Combined all-in-one adhesive (SBU)was found to render a superior bonding performance intotal-etch mode comparing to self-etch mode.

Tooth bleaching before, during and afterorthodontic treatment / Aclaramiento dental, durante y después de ortodoncia

Currently there is a significant increase the in demand for procedures associated with dental esthetics. Asa result, in recent years many systems have been developed for tooth bleaching through different forms ofapplication. Despite its widespread use, it has been argued that this process can alter not only the structure ofthe enamel surface, but can interfere with bonding procedures required to carry out orthodontic treatment.Different studies have showed that in patients receiving dental treatment clearance, adhesion processes arenot as efficient as those who did not.This article presents a literature review on the current state of tooth bleaching, and the relationship and / oreffect on orthodontic treatment when it is done before, during or after bleaching.

Actualmente se presenta un aumento importante de la demanda por procedimientos asociados a la estéticadental. A consecuencia de ello, en los últimos años se han desarrollado múltiples sistemas para realizar elaclaramiento dental por medio de diferentes formas de aplicación. A pesar de su amplio uso, se ha discutidoque dicho proceso puede alterar no solo la estructura de la superficie del esmalte, sino que puede interferiren los procedimientos de adhesión que se requieren para llevar a cabo un tratamiento de ortodoncia.Diferentes investigadores han realizado estudios que demuestran que, en los pacientes que han recibidotratamientos de aclaramiento dental, los procesos de adhesión no son tan eficientes como en aquellos queno lo recibieron.En este artículo, se presenta una revisión de literatura sobre el estado actual del aclaramiento dental, y la relacióny/o efecto que tiene en el tratamiento de ortodoncia, cuando éste se hace antes, durante o después del mismo.

Morphological patterns of self-etching primers and self-etching adhesive bonded to tooth structure / 대한치과보존학회지

The purpose of this study was to compare in vitro interfacial relationship of restorations bonded with three self-etching primer adhesives and one self-etching adhesive. Class I cavity preparations were prepared on twenty extracted human molars. Prepared teeth were divided into four groups and restored with four adhesives and composites: Clearfil SE Bond/Clearfil(TM) AP-X (SE), UniFil Bond/UniFil(R) F (UF), FL Bond/Filtek(TM) Z 250 (FL) and Prompt L-Pop/Filtek(TM) Z 250 (LP) After storing in distilled water of room temperature for 24 hours, the specimens were vertically sectioned and decalcified. Morphological patterns between the enamel/dentin and adhesives were observed under SEM. The results of this study were as follows; 1. They showed close adaptation between enamel and SE, UF and FL except for LP. 2. The hybrid layer in dentin was 2 microm thick in SE, 1.5 microm thick in UF, and 0.4 microm in both FL and LP. So, the hybrid layers of SE and UF were slightly thicker than that of FL and LP. 3. The lengths and diameters of resin tags in UF and FL were similar, but those of LP were slightly shorter and slenderer than those of SE. 4. The resin tags were long rod shape in SE, and funnel shape in other groups. Within the limitations of this study, it was concluded that self-etching primer adhesives showed close adaptation on enamel. In addition, the thickness of hybrid layer ranged from 0.4-1.5 microm between adhesives and dentin. The resin tags were long rod or funnel shape, and dimension of them was similar or different among adhesives.