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Objective The aim of this study was to evaluate the effect of different photoinitiator systems on the cell viability and physico-chemical properties of an experimental adhesive resin of a two-step self-etch adhesive system. Methods Eight photoinitiators and coinitiators were evaluated, camphorquinone (CQ); ethyl-dimethylamino benzoate (EDAB); diphenyliodonium hexafluorophosphate (DPIHFP); 1,3-benzodioxole (BDO); piperonyl alcohol (AP); 1,3-diethyl-2-thiobarbituric acid (TBA); bisphenyl phosphinic oxide (BAPO); and diphenyl phosphinic oxide (TPO). Seven experimental adhesive resins (Bis-GMA:TEGDMA – 1:1 by wt%) were formulated by varying the initiation systems: RCQ+EDAB (control), RCQ+EDAB+DPHFP, RCQ+BDO, RCQ+AP, RCQ+TBA, RBAPO and RTPO. The cell viability of the different photoinitiators in their isolated form and after being incorporated into the adhesive resins was evaluated using the MTT assay. The degree of conversion within the hybrid layer (DC in situ) was evaluated by micro-Raman spectroscopy; the polymerization kinetics, by FTIR spectroscopy. The water sorption (Wsp) and solubility (Wsl) were calculated by using percentage of gain and loss of mass. Data were analyzed using One-way ANOVA and Kruskal-Wallis tests (α = 0.05). Results When evaluated in their isolated form, the DPIHFP was considered cytotoxic in all concentrations evaluated. When incorporated into and adhesive resin, RCQ+TBA presented higher cell viability values than control and the highest values of DC in situ (p Significance The pair CQ + TBA could be potentially useful in the development of materials with improved biocompatibility.

Objective: of this study was to characterize and correlate the absorption spectra of three photoinitiators [camphorquinone (CQ), diphenyl(2,4,6-trimethylbenzoyl) phosphine oxide (TPO) and phenylbis (2,4,6-trimethylbenzoyl)-phosphine oxide (BAPO)], using second or third-generation light curing units (LCU), and to evaluate the degree of conversion and the physical properties of an experimental resin adhesive. Material and methods: Second-generation (Radii-cal® and Emitter D®) and third-generation (Valo® Cordless and Bluephase N®) LCU were assessed regarding spectrum and irradiance rate of emitted light. Also, the photoinitiators (CQ, TPO and BAPO) were characterized by a light absorption spectrum assessed by UV-Vis spectroscopy, degree of conversion and yellowing effect. Statistical analyzes considered two-way ANOVA and post-hoc Tukey test. Results: BAPO presented higher reactivity compared to TPO. Regarding degree of conversion of the photoinitiators activated by different light-curing units, the Emitter D® device promoted a high degree of conversion. BAPO presented the highest yellowing effect values. Conclusions: The emission and absorption characteristics of the photoinitiators were different. The polymerization reaction activated by the second-generation light-curing unit was reduced when using an experimental resin with photoinitiator TPO, and the third-generation light-curing unit showed a higher polymerization potential regardless of the photoinitiator. Keywords Light-curing of dental adhesives; Photoinitiators dental; Curing lights dental.

The authors aimed to evaluate the effectiveness of glycine air-polishing compared to curette debridement on the treatment of peri-implant diseases. PRISMA guidelines for systematic reviews were followed. Clinical trials of patients diagnosed with peri-implant mucositis or peri-implantitis treated with glycine air-polishing or curette debridement were selected. Six electronic databases (Cochrane Central Register of Controlled Trials, MEDLINE via PubMed, EMBASE, Scopus, Web of Science and BVS) were searched until july 2021. The risk of bias was assessed using RoB 2 and ROBINS-I tools and the certainty of the evidence using GRADE. Bleeding on probing (BOP), probing depth (PD) and plaque index (PI) were assessed. Subgroup analyses were performed considering the follow-up period for peri-implant mucositis. Seven studies were included and meta-analyses were performed with three randomized clinical trials (RCTs), all presenting a low risk of bias. Low quality of evidence was achieved. Both treatments presented similar global results on the BOP and PI peri-implant mucositis analyses. Glycine air-polishing showed better results (p=0.04; I2=90%) on PD peri-implant mucositis meta-analysis. Data was insufficient to perform any analysis considering peri-implantitis. Although there was modest effect of glycine air polishing on probing depth compared to manual curatagge, there is insufficient evidence to suggest either glycine air-polishing or curette debridement to reduce signs of peri-implant diseases (CRD42019128599).

The objective in this case report is to present a correction of excessive gingival exposure performed through periodontal esthetic surgery, using clinical crown lengthening and lip repositioning. The patient reported discomfort when smiling due to excessive gingival exposure, and clinical and photographic examinations of the patient showed vertical maxillary growth as the main diagnosis. In the digital smile design, the possibility of crown lengthening observed for teeth – upper left and right central incisors and upper left lateral incisor. A lip-repositioning procedure was also planned. An incision was performed at the mucogingival junction, and a parallel incision was realized at the top of the alveolar mucosa. Afterward, the incised gingival band was removed through vertical incisions in the planned border area. The muscular area was preserved. A simple suture was made, with the approach of the gingival margins around the surgical area. The crown-lengthening procedure was performed with the flapless technique. After 2-year follow-up, the periodontal esthetic surgery, comprising crown lengthening and lip repositioning, was noninvasive and can thus serve as an interesting alternative treatment for excessive exposure of the gingival smile, as it results in a harmonious and natural smile.

Objetivo: identificar a satisfação profissional de cirur­giões-dentistas atuantes na atenção básica do Sistema Único de Saúde em um município do sul do Brasil, que foi pioneiro na implantação de diretrizes municipais de saúde bucal. Sujeitos e método: para a coleta dos da­dos, foram utilizados componentes descritivos a partir de dados secundários obtidos por meio de um questio­nário aplicado para todos os cirurgiões-dentistas atuan­tes no referido serviço. Resultados: no total, 46 profis­sionais foram incluídos na amostra, sendo que 82,5% estavam satisfeitos em seu trabalho e, desses, o reco­nhecimento dos usuários do serviço foi o fator que os cirurgiões-dentistas mais associaram à felicidade. Já os fatores mais relacionados à infelicidade no trabalho são as críticas ao salário e os usuários não colaboradores; 97,8% acreditavam que seu trabalho fazia diferença na comunidade em que estavam inseridos. Conclusão: este estudo sugere que estabelecer diretrizes no proces­so de trabalho pode ter um impacto positivo na prática e na satisfação dos profissionais, e essas estratégias po­dem ser utilizadas como amparo para planejamento em gestão de saúde bucal de forma sistematizada.