Influence of different adhesion strategies on glass fiber post retention.

Background: Failures in glass fiber post (GFP) retention may be associated with low adhesion achieved in root dentin. Material and Methods: 55 single-rooted premolars were endodontically treated and distributed according to different adhesion strategies (n=11): G1: RelyX ARC (3M ESPE; etch-rinse strategy); G2: Relyx Ultimate (3M ESPE; etch-rinse strategy); G3: AllCem (FGM; etch-rinse strategy); G4: Relyx Ultimate (3M ESPE; self-etching strategy); G5: RelyX U200 (3M ESPE; self-adhesive strategy). For Bonding Strength (BS) analysis, the roots were sectioned in slices (1.0mm thickness) corresponding to each root third and submitted to push-out test. The type of failure was assessed by scanning electron microscopy (SEM). Results: The highest BS averages were found in G2 and G3. However, in the middle and apical root thirds, G3 showed statistically similar results to G4 and G5. In the cervical and middle third, G1 was statistically similar to G4 and G5. The mixed type of failure was the most common in all groups. Conclusions: Self-etching (G4) and self-adhesive resin (G5) cements, showed similar BS results of immediate bonding in the cementation of GFP compared to conventional resin cements (G1, G2, G3). Key words:Dental Cements, Dentin-Bonding Agents, Post and Core Technique, Dental Bonding.

The influence of violet LED light on tooth bleaching protocols: In vitro study of bleaching effectiveness.

BACKGROUND: Employing violet LED on tooth bleaching is a recent but promising technique. This study aimed to assess the bleaching effectiveness of violet light-emitting diodes (LEDs) associated or not with bleaching gels containing hydrogen peroxide (HP) or carbamide peroxide (CP). METHODS: seventy bovine incisors were randomly assigned into 7 groups (n = 10) according to the technique and whitening product used. Group C: Artificial saliva (placebo); Group HP L-: three sessions of HP at 35 % without light activation; Group CP L-: three weeks of CP at 16 % for 4 h/day; Group HP CP L-: three sessions of HP at 35 % without light activation + 2 weeks of CP at 16 %, for 4 h/day; Group LED: four sessions with violet LED; Group HP L+: three sessions with HP at 35 % + violet LED; Group CP L+: three weeks with CP at 16 % for 4 h/day + violet LED. Color changes (ΔE and ΔL) were measured with a portable digital spectrophotometer. RESULTS: The results were similar between the groups of bleaching protocols, demonstrating that the use of the violet LED did not influence bleaching effectiveness when using HP 35 % or CP 16 % after 3 sessions. In addition, the use of the violet LED alone obtained ΔE values ​​similar to the protocols with the use of peroxides, however less variation of ΔL was observed for this group. CONCLUSIONS: The use of violet LEDs associated or not with bleaching gels was effective for tooth whitening. In addition, it was also concluded that the physical lightening technique with violet LED used alone produced less variation in dental brightness.

Clinical Evaluation of Postoperative Sensitivity in Class I Resin Composite Restorations / Avaliação clínica da sensibilidade pós-operatória em restaurações classe I em compósitos restauradores

Objective: To evaluate the post operative sensitivity in posterior restorations with different resin composites and adhesive systems as well as the influence of the depth and extent of the dental cavity. Material and Methods: A double-blind clinical trial was carried out with 80 class I restorations of 16 patients. The participants were divided into 4 groups according to the adhesive system + composite: F + P (Filtek P90™ + P90™); R + S (Rok™ + Stae™); P + A (P60™ + Adper SE PLUS™); E + X (Evolux™ + XPBond™ Adhesive). After 7, 15 and 30 days, the presence of postoperative sensitivity was evaluated and classified according to type and intensity. The data were submitted to Pearson'schi-square test, Fisher's exact teste, Student'st-test and ANOVA. A significance level of 5%was used for all tests. Results: The presence of post operative sensitivity was approximately 6% of the total sample. The sensitivity decreased with the evaluation time, with the smallest reduction occurring from the 7-day evaluation compared to the other evaluations. Conclusion: There was found no evidence of influence of the resin composite and adhesive type, depth and extension of the cavities for the presence of postoperative sensitivity. (AU)

Objetivo: Avaliar a prevalência da sensibilidade pós-operatória em dentes posteriores restaurados com diferentes resinas compostas e sistemas adesivos em relação a profundidade e extensão da cavidade dental. Material e Métodos: Estudo clínico duplo-cego foi realizado com 80 restaurações classe I em 16 pacientes. Os pacientes foram divididos em 04 grupos de acordo com compósito restaurador e sistema adesivo: F + P (Filtek P90™ + P90™); R + S (Rok™ + Stae™); P + A (P60™ + Adper SEPLUS™); E + X (Evolux™ + XPBond™ Adhesive). Após 7, 15 e 30 dias, a presença de sensibilidade pós-operatória foi avaliada e classificada quanto ao tipo e intensidade. Os dados foram analisados estatisticamente mediante os testes estatísticos qui-quadrado de Pearson, exato de Fisher, t de Student e ANOVA. Um nível de significância de 5%foi utilizado para todas as analises. Resultados: A presença de sensibilidade pós-operatória foi de aproximadamente 6% na amostra. A sensibilidade reduziu com o tempo de avaliação, sendo que a menor redução ocorreu da avaliação de 7 dias para as outras avaliações e a menor de 15 para 30 dias. Conclusão: Não se evidenciou influência do tipo de compósito e adesivo, profundidade e extensão das cavidades na presença de sensibilidade pós-operatória. (AU)

Multidisciplinary Approach to Smile Restoration: Gingivoplasty, Tooth Bleaching, and Dental Re-anatomization.

This article reports on the case of a patient who underwent a multidisciplinary treatment in smile design that entailed dental cosmetic techniques involving esthetic periodontal surgery, teeth bleaching, and re-anatomization of the upper incisors. The male patient presented with a chief complaint of an excessive gingival display while smiling, as well as small, darkened teeth with spaces between them. After diagnosis and patient consent, therapy began in the following stages: periodontal plastic surgery with probing, bleeding points delimitation, beveled incision, removal of the gingival band with periodontal curettes, and finishing with an electric scalpel. After 21 days following surgery, dental bleaching using a combined technique that included two sessions of in-office bleaching (35% hydrogen peroxide) and 2 weeks of at-home bleaching (carbamide peroxide 16% for 4 hours per day) was carried out, followed by dental re-anatomization using resin composite. Diagnostic waxing, mock-up, fabrication of a palatal silicone index, incremental sculpturing, and structuring the restoration of the palatal shell to the vestibular surfaces was then completed, followed by occlusal adjustment, finishing, and polishing. The multidisciplinary intervention was fundamental for the accomplishment of the proposed treatment that combined biological, functional, and esthetic concepts.

In vivo optical coherence tomographic imaging to monitor gingival recovery and the adhesive interface in aesthetic oral rehabilitation: A case report.

The available methods for veneer evaluation are limited to clinical and radiographic examinations, which may not allow the appropriate identification of failure. In this report, we demonstrate the use of optical coherence tomography (OCT) as a noninvasive diagnostic and follow-up method to evaluate gingival recovery and the adhesive interface in aesthetic oral rehabilitation involving periodontal plastic surgery and ceramic laminate veneers. OCT was efficient for evaluating both soft and hard tissues, as well as the quality of the adhesive interface. In conclusion, OCT was found to be a promising approach for the professional evaluation of aesthetic oral rehabilitation, as it was capable of generating images that enabled the analysis of gingival recovery and the adhesive interface.

Reabilitação estética de dentes anteriores fraturados / Aesthetic rehabilitation of anterior fractured teeth

As fraturas coronárias causam comprometimento estético e alteração da mastigação e fonação, interferindo diretamente na qualidade de vida do indivíduo. Diante deste problema, para reabilitação do paciente, pode-se realizar a colagem do fragmento (quando existente) ou restaurações em resina composta ou cerâmica. O objetivo deste trabalho é relatar um caso clínico de reabilitação estética de dentes anteriores fraturados. Paciente procurou atendimento na clínica do Curso de Especialização em Dentística do Centro de Pós-Graduação em Odontologia (CPGO) em Recife/PE queixando-se da fratura nos incisivos centrais superiores. Ao exame clínico e radiográfico, constatou-se fratura coronária oblíqua de esmalte e dentina, sem comprometimento biológico. O paciente foi submetido ao tratamento clareador dental e os dentes foram restaurados diretamente com resina composta com o auxílio de uma guia palatina em silicone. O resultado evidenciou satisfação expressa pelo paciente. Concluiu-se que a técnica de clareamento dental foi eficaz, facilitando o alcance do mimetismo e cor ideal da resina composta a ser empregada; a utilização da guia palatina confeccionada em silicone de adição possibilitou anatomização adequada da face lingual e definição do contorno; o tratamento realizado apresentou excelente reprodução da forma, cor e textura da estrutura dental, permitindo a restauração de um sorriso harmônico (AU).

Coronary fractures cause aesthetic impairment and alteration of chewing and phonation, directly interfering in the individuals quality of life. Faced with this problem, for patient rehabilitation, the fragment can be bonded (when existing) or composite resin or ceramic restorations. The aim of this paper is to report a clinical case of aesthetic rehabilitation of fractured anterior teeth. Patient sought care at the Clinic of the Specialization Course in Dentistry of the Postgraduate Center in Dentistry (CPGO), Recife/PE, complaining of fracture in the maxillary central incisors. Clinical and radiographic examination revealed oblique coronary fracture of enamel and dentin, without biological impairment. The patient underwent dental bleaching treatment and the teeth were restored directly with composite resin with the aid of a silicone palatal guide. The result showed satisfaction expressed by the patient. It was concluded that the tooth whitening technique was effective, facilitating the reach of mimicry and ideal color of the composite resin to be employed; the use of the palatal guide made of addition silicone allowed adequate anatomy of the lingual face and definition of the contour; the treatment performed presented excellent reproduction of the shape, color and texture of the dental structure, allowing the restoration of a harmonious smile (AU).

The influence of storage time and pH variation on water sorption by different composite resins.

OBJECTIVE: The objective of this work was to assess the influence of storage time and pH cycling on water sorption by different composite resins. MATERIALS AND METHODS: Nine resin brands were selected and divided into groups: G1-ROK (SDI), G2-ICE (SDI), G3-GLACIER (SDI), G4-Z350 (3M/ESPE), G5-Z250 (3M/ESPE), G6-TPH 3 (DENTSPLY), G7-ESTHET X (DENTSPLY), G8-SUPRAFILL (SSWHITE), and G9-MASTERFILL (BIODINΒMICS). Ninety specimens, ten per group, were obtained using an aluminum matrix. Specimens measured 10 mm diameter × 2 mm width. The groups were divided into subgroups according to the immersion solution: A - control (n = 05) stored in artificial saliva pH = 7.0 and B-test (n = 05) submitted to seven consecutive days of pH cycling (cariogenic challenger) that consisted of immersion in a pH° = 4.3 solution for 6 h followed by immersion in a pH¹ =7.0 solution for 18 h and stored in artificial saliva pH = 7.0 until the end of the experiment. The specimens were weighed on six occasions: T 0 (after fabrication), T 1 (24 h), T 2 (7 days), T 3 (15 days), T 4 (30 days), T 5 (60 days), and then analyzed. The water sorption was determined by the weight difference between the specimens at the time intervals. RESULTS: The mean weight gain was exactly the same for both the subgroups within group G4. The highest means for the control subgroup were found in groups: G1, G5, G7, G8, and G9. For the pH cycling subgroup, the highest means were found in G2, G3, and G6; however, significant differences between the subgroups compared to the mean-weight gain were found for G1, G5, and G7. CONCLUSION: The water sorption of composite resins is dependent upon their storage time. The pH cycling created a significant impact on resins G1, G5, and G7. The sorption and solubility of composite resins vary according to their chemical composition.