Analysis of implant-supported cantilever fixed partial denture: An in vitro comparative study on vertical misfit, stress distribution, and cantilever fracture strength.

PURPOSE: To evaluate the vertical misfit, stress distribution around dental implants, and cantilever fracture strength of 3-unit implant-supported cantilever fixed partial dentures (FPDs) using frameworks made from different materials and manufacturing techniques. MATERIALS AND METHODS: Forty FPDs were fabricated and divided into 5 groups (n = 8) based on the framework material used: LAS Co-Cr (Conventional casting-laser welding); TIG Co-Cr (Conventional casting -TIG welding); OP Co-Cr (Conventional casting-one-piece); CAD Co-Cr (CAD-CAM); and CAD Zr (CAD-CAM ZrO2 ). The vertical misfit was evaluated before porcelain application (T1) and before (T2), and after thermomechanical cycling (T3) by stereomicroscopy. Cantilever fracture strength was tested with a 50 kN (5000 kgf) load cell at a crosshead speed of 0.5 mm/min. Qualitative and quantitative photoelastic analysis was performed to evaluate stress distribution at seven specific points in five FPDs (n = 1/group) subjected to occlusal loading. RESULTS: Only the molar showed interaction among the three factors (G × S × T; F(20.932) = 1.630; p = 0.044). Thermomechanical cycling (T2 vs. T3) had a significant effect on intra-group vertical misfit in molar, especially in LAS Co-Cr (Δ = 5.87; p = 0.018) and OP Co-Cr (Δ = 5.39; p = 0.007), with no significant effect in premolar (p > 0.05). Ceramic application combined with thermomechanical cycling (T1 vs. T3) caused a significant intra-group increase in vertical misfit in all groups, both in the molar and premolar (p < 0.05). OP Co-Cr was associated with greater vertical misfit and stress concentration. Frameworks manufactured by the CAD-CAM system exhibited lower vertical misfit and better stress distribution. FPDs with metal frameworks (>410.83 ± 72.26 N) showed significantly higher fracture strength (p < 0.05) than zirconia (277.47 ± 39.10 N), and the first signs of ceramic veneering fracture were observed around 900 N. CONCLUSIONS: FPDs with frameworks manufactured using a CAD-CAM system appear to be associated with lower vertical misfit and better stress distribution, although the section of the frameworks followed by welding may be a viable alternative. In addition, metal frameworks exhibit high fracture strength.

Oral health conditions of institutionalized older adults and associated factors / Condições de saúde bucal de idosos institucionalizados e seus fatores associados

INTRODUCTION: The growth of the Brazilian older adult population has influenced the increased demand for institutionalization for this public, which usually has poor oral health conditions such as edentulism. OBJECTIVE: To characterize the oral health conditions and verify the variables related to the edentulism of institutionalized older adults and verify the relation of the time of institutionalization with oral health. METHODS: It was a cross-sectional study conducted with 512 institutionalized older adults in which the sociodemographic profile, general health conditions, and oral health care and conditions were evaluated by clinical exams, consultations of medical records, and structured questionnaires. The data were analyzed in the Statistical Package for Social Sciences using the Pearson Chi-square and Fisher's Exact tests and a logistic regression model using a 95% confidence level. RESULTS: A high DMFT (29.4), high prevalence of complete edentulism (61.3%), high need for maxillary (73.6%), and mandibular oral rehabilitation (56.8%) were observed. Edentulism was associated with older age (p<0.001), lower schooling (p<0.001) and non-retirement (p=0.031). It was found that longer institutionalization time remained associated with edentulism even when adjusted by sociodemographic and general health variables (p=0.013). It was also associated with the absence of brushing (p=0.024) and a lower frequency of tooth, gum, and prosthesis brushing (p<0.001). CONCLUSION: It is suggested to establish oral health care routines within long-term institutions for the effective maintenance of oral health throughout the institutionalization time.

INTRODUÇÃO: O crescimento da população idosa brasileira tem influenciado no aumento da procura por institucionalização para esse público, que costuma apresentar precárias condições de saúde bucal como o edentulismo. OBJETIVO: Caracterizar as condições de saúde bucal e verificar as variáveis relacionadas ao edentulismo de idosos institucionalizados, além verificar a relação do tempo de institucionalização com a saúde bucal. MÉTODOS: Trata-se de um estudo transversal realizado com 512 idosos institucionalizados em que o perfil sociodemográfico, as condições gerais de saúde e os cuidados e condições de saúde bucal foram avaliados por meio de exames clínicos, consultas a prontuários e questionários estruturados. Os dados foram analisados no Statistical Package for the Social Sciences por meio dos testes Qui-quadrado de Pearson e Exato de Fisher e um modelo de regressão logística com nível de confiança de 95%. RESULTADOS: Observou-se alto CPOD (29,4), alta prevalência de edentulismo total (61,3%), alta necessidade de reabilitação oral maxilar (73,6%) e mandibular (56,8%). O edentulismo esteve associado a maior idade (p<0,001), menor escolaridade (p<0,001) e ausência de aposentadoria (p=0,031). Verificou-se que o maior tempo de institucionalização permaneceu associado ao edentulismo mesmo quando ajustado por variáveis sociodemográficas e de saúde geral (p=0,013). Além disso, também esteve associado à ausência de escovação (p=0,024) e menor frequência de escovação de dentes, gengivas e próteses (p<0,001). CONCLUSÃO: Sugere-se estabelecer rotinas de atenção à saúde bucal nas instituições de longa permanência para a manutenção efetiva da saúde bucal ao longo do tempo de institucionalização.

Influence of the COVID-19 pandemic on pain and oral health-related quality of life in women with temporomandibular disorder.

OBJECTIVE: This study aimed to evaluate and compare pain intensity and Oral Health-related Quality of Life (OHRQoL) in women with temporomandibular disorder (TMD) before (T1) and during (T2) COVID-19 pandemic. MATERIALS AND METHODS: Sample was composed of forty-one female participants with painful TMD, who presented for TMD treatment. Subjects were asked to indicate their pain intensity and to answer the Oral Health Impact Profile-14 (OHIP-14). Participants data were collected twice: T1 (evaluation of medical records fulfilled before COVID-19 pandemic) and T2 (by means of an online form). Socio-demographic data were assessed in T1. Statistical analysis was performed with a significance level of 5% (Wilcoxon, chi-square or Fisher's exact tests, multiple linear regressions). RESULTS: No difference was found in pain intensity (p=0.26) and OHIP-14 global scores (p=0.53). Physical pain (p=0.03) and social disability (p=0.05) domains improved. In T1, subject's occupation was associated with OHIP-14 global score, physical pain, and physical disability domains. In T2, age was associated with OHIP-14 global scores as well as physical pain, psychological discomfort, and psychological disability domains. CONCLUSION: COVID-19 pandemic did not worsen pain intensity and OHRQoL in women with painful TMD, and it is suggested that socio-demographic characteristics influenced TMD patients coping skills during pandemic.

The challenge of managing oral maxillofacial rehabilitation with quality and cost-benefit.

Although orofacial cancer leads to substantial functional, esthetic, and psychosocial deficits for patients, reconstructive plastic surgeries may not be indicated for large facial defects. The high costs of prosthetic oral maxillofacial rehabilitation may hamper such treatment, which commonly involves virtual planning, craniofacial implants, and computer-aided design and computer-aided manufactured prostheses. This report shows the treatment of 2 patients with large facial defects from surgical resection of cancerous tissue who were rehabilitated with implant-supported bar-clip overdentures and facial prostheses fabricated by using low-cost straightforward methods.

A Systematic Review of the Potential Effects of Lippia sidoides on Dental Plaque and Periodontal Diseases.

Lippia sidoides is a typical shrub from Brazil that has been used in traditional medicine. This is a systematic review on the effect of L. sidoides for controlling dental plaque, gingivitis, and periodontitis. A database search through May 2021 in Medline/PubMed, SCOPUS, BVS, and Web of Science identified 711 reports of which 17 met our inclusion criteria. Five randomized controlled trials and three animal studies were included that compared L. sidoides-based products (toothpaste, mouthrinse, and gel) to cetylpyridinium chloride, chlorhexidine, and placebo products. Among the human studies, a significant antiplaque effect after treatment with L. sidoides-based products was observed in three studies and an antigingivitis effect in two studies, similar to chlorhexidine-based products. One study found superior dental plaque reduction compared to cetylpyridinium chloride mouthrinse. Only one study testing a L. sidoides gel found no antiplaque effect. Among the animal studies, an L. sidoides mouthrinse significantly reduced calculus in two studies, inflammatory infiltrate in one study, and plaque bacteria and gingivitis in one study. An L. sidoides gel significantly reduced alveolar bone loss and inflammatory response in one study in which mice were submitted to ligature-induced periodontal disease. In general, L. sidoides-based products were effective in reducing dental plaque and calculus formation, as well as clinical signs of gingivitis. As most studies present methodological limitations, these results should be interpreted carefully. Further clinical trials with greater methodological accuracy and control of biases are necessary for the use of L. sidoides-based products in humans to be viable in clinical practice.

Influence of the COVID-19 pandemic on pain and oral health-related quality of life in women with temporomandibular disorder

ABSTRACT Objective: This study aimed to evaluate and compare pain intensity and Oral Health-related Quality of Life (OHRQoL) in women with temporomandibular disorder (TMD) before (T1) and during (T2) COVID-19 pandemic. Materials and Methods: Sample was composed of forty-one female participants with painful TMD, who presented for TMD treatment. Subjects were asked to indicate their pain intensity and to answer the Oral Health Impact Profile-14 (OHIP-14). Participants data were collected twice: T1 (evaluation of medical records fulfilled before COVID-19 pandemic) and T2 (by means of an online form). Socio-demographic data were assessed in T1. Statistical analysis was performed with a significance level of 5% (Wilcoxon, chi-square or Fisher's exact tests, multiple linear regressions). Results: No difference was found in pain intensity (p=0.26) and OHIP-14 global scores (p=0.53). Physical pain (p=0.03) and social disability (p=0.05) domains improved. In T1, subject's occupation was associated with OHIP-14 global score, physical pain, and physical disability domains. In T2, age was associated with OHIP-14 global scores as well as physical pain, psychological discomfort, and psychological disability domains. Conclusion: COVID-19 pandemic did not worsen pain intensity and OHRQoL in women with painful TMD, and it is suggested that socio-demographic characteristics influenced TMD patients coping skills during pandemic.

RESUMO Objetivo: O presente estudo objetivou avaliar e comparar a intensidade da dor e a Qualidade de Vida Relacionada à Saúde Bucal (QVRSB) de mulheres com disfunção temporomandibular (DTM), antes (T1) e durante (T2) a pandemia de COVID-19. Métodos: A amostra foi composta por quarenta e uma mulheres com DTM dolorosa, que se apresentaram para manejo da DTM. As participantes informaram a intensidade da dor por meio de escala numérica, e responderam ao questionário Perfil de Impacto na Saúde Oral - 14 (Oral Health Impact Profile, OHIP-14). Os dados das participantes foram coletados duas vezes: T1 (avaliação de prontuários odontológicos preenchidos previamente à pandemia de COVID-19) e T2 (por meio de formulário on-line). Dados sociodemográficos foram coletados em T1. A análise estatística foi realizada com nível de significância de 5% (testes de Wilcoxon, qui-quadrado ou exato de Fisher, e regressões lineares múltiplas). Resultados: Nenhuma diferença foi encontrada para a intensidade da dor (p = 0,26) e o escore global do OHIP-14 (p = 0,53). Os domínios relativos à dor física (p = 0,03) e incapacidade social (p = 0,05) melhoraram. Em T1, a ocupação das participantes foi associada ao escore global do OHIP-14 e aos domínios de dor e incapacidade física. Em T2, a idade foi associada aos escores globais do OHIP-14, bem como aos domínios dor física, desconforto psicológico e incapacidade psicológica. Conclusão: A pandemia de COVID-19 não piorou a sensibilidade à dor e a QVRSB das mulheres com DTM dolorosa, e as características sociodemográficas influenciaram suas habilidades de enfrentamento.

Gluten-Free Diet Reduces Pain in Women with Myofascial Pain in Masticatory Muscles: A Preliminary Randomized Controlled Trial.

AIMS: To evaluate the efficacy of a gluten-free diet (GFD) as a treatment modality for pain management in women with chronic myofascial pain in masticatory muscles. METHODS: In this randomized controlled trial, 39 female subjects were evaluated according to the Research Diagnostic Criteria for Temporomandibular Disorders (RDC/TMD) and divided into three groups: a healthy group (n = 14; mean ± SD age = 34.57 ± 9.14 years); a control group (n = 12; age = 31.50 ± 7.38 years); and an experimental group (n = 13; age 30.00 ± 7.64 years). The outcome variables were: pain intensity, mechanical pain threshold (MPT), and pressure pain threshold (PPT). MPT was performed on the masseter muscle, and PPT was performed on both the masseter and anterior temporalis muscles. A nutritionist prescribed a 4-week individualized GFD for the experimental group. The healthy group was analyzed only initially, whereas the control and experimental groups were analyzed again after 4 weeks. Data were subjected to statistical analysis with a significance level of 5% (one-way analysis of variance followed by Bonferroni post hoc, paired t, Wilcoxon signed rank, Kruskal-Wallis/Dunn, and Pearson chi-square tests). RESULTS: Participants who underwent a GFD showed reduction in pain intensity (P = .006) and an increase in PPT of the masseter (P = .017) and anterior temporalis (P = .033) muscles. The intervention did not influence the MPT of the masseter muscle (P = .26). In contrast, the control group showed no improvement in any parameter evaluated. CONCLUSION: GFD seemed to reduce pain sensitivity in women with TMD and may be beneficial as an adjunctive therapy for chronic myofascial pain in masticatory muscles; however, further studies in the fields of orofacial pain and nutrition are required.

Whitening effect of 35% hydrogen peroxide in simulation of tooth with orthodontic bracket.

OBJECTIVE: To evaluate the color change and tooth whitening perception in 2 and 3 mm dental specimens simulating the orthodontic bracket for a 14-day period. MATERIALS AND METHODS: Forty bovine tooth fragments (8 × 7 mm) of 2 mm (G2, n = 20) and 3 mm (G3, n = 20) were divided into Control (C: without bracket simulation and whitening) and Experimental (E: with composite resin simulating orthodontic bracket cementation area). Analyses of color change (ΔE00 ) and perception of tooth whitening (WID ) were performed before (T0 ) and after (T1 ) the first bleaching session; before (T2 ) and after (T3 ) the second bleaching session; and after 7 days of the second bleaching session (T4 ). RESULTS: After 14 days (T4), ΔE00 and WID showed similarity results, except for G2C and G3E. The thickness did not influence the ΔE00 and WID (G2C = G3C and G2E = G3E). The presence of orthodontic bracket did not interfere in the color change or tooth whitening perception after 14 days, except for comparison of G2C and G3E. Additionally, dentin thickness did not influence the color change. CLINICAL SIGNIFICANCE: Teeth with orthodontic brackets showed similar color change and whitening perception to teeth without orthodontic bracket, but it is not influenced by dentin thickness.

Microbiological evaluation of an experimental denture cleanser containing essential oil of Lippia sidoides.

The antimicrobial activity of an experimental solution containing essential oil of Lippia sidoides for denture cleaning was evaluated by (1) minimum inhibitory (MIC) and fungicidal/bactericidal concentration (MFC/MBC) tests against Candida albicans, Staphylococcus aureus, and Pseudomona aeruginosa; (2) the metabolic activity of C. albicans biofilm formed on flat-bottom microplates and denture base specimens based on the reduction of 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide (MTT); and (3) scanning electron microscopy, to evaluate the fungal biofilm morphology. The solution showed antimicrobial action against the pathogens tested (C. albicans - MIC and MFC: 19.53 µg ml-1, S. aureus - MIC and MBC: 78.12 µg ml-1, P. aeruginosa - MIC: 625 µg ml-1, MBC: 2,500 µg ml-1), reduced the metabolic activity of C. albicans biofilm up to 97%, and caused cell wall damage at low concentrations (195.3-390.6 µg ml-1) and in short time periods (20 min). Therefore, the experimental solution has the potential to be used as an alternative in the prevention and treatment of denture-induced infections.

Facial rehabilitation with implant-retained nasal prosthesis of acrylic resin: a case report / Reabilitação facial com prótese nasal em resina acrílica implanto-retida: relato de caso clínico

ABSTRACT The objective of this study was to report a clinical case of facial rehabilitation with an acrylic implant-retained nasal prosthesis after partial rhinectomy resulting from the resection of a basal cell carcinoma in the patient, a 53-year-old Caucasian, normosystemic, professional cowboy. After clinical examination and in possession of computed tomography images, surgery was performed for the placement of conventional dental implants in the premaxillary region (left side). After the surgery, a three-month period of waiting was observed to allow osseointegration of the implants. Later, the nasal prosthesis was prepared, and at the end of treatment, this presented satisfactory peripheral adaptation, retention and esthetics. The patient has returned for follow-up every 6 months, regarding analysis of the prosthesis color, peri-implant health, hygiene, and exchange of the magnets and relays when necessary. The authors concluded that this therapy may be well indicated in patients with partial and total nasal defects, provided that there is correct planning and execution of the surgical, clinical and laboratory phases.

RESUMO O objetivo deste trabalho é relatar um caso clínico de reabilitação facial com prótese nasal acrílica implanto-retida pós-rinectomia parcial decorrente da ressecção de um carcinoma basocelular em um paciente do sexo masculino, vaqueiro, 53 anos de idade, caucasiano e normossistêmico. Após exame clínico e de posse da tomografia computadorizada, foi realizada a cirurgia de instalação dos implantes dentários convencionais na região da pré-maxila (lado esquerdo). Depois de realizada a cirurgia, esperou-se a osseointegração dos implantes por três meses e, posteriormente, foi realizada a confecção da prótese nasal que, ao final do tratamento, apresentou adaptação periférica, retenção e estética satisfatórias. O paciente tem retornado a cada 6 meses para proservação quanto à análise da cor da prótese, saúde periimplantar, higienização, troca dos magnetos e reembasamentos quando necessários. Os autores concluem que essa terapia pode ser bem indicada em defeitos nasais parciais e totais, desde que haja correto planejamento e execução das fases cirúrgica, clínica e laboratorial.

Infiltration by Streptococcus mutans in provisional crowns fixed by two types of cementing agents ­ pilot double-blind randomized clinical trial / Infiltração por Streptococcus mutans em coroas dentárias provisórias fixadas por dois tipos de agentes cimentantes ­ estudo clínico randomizado duplo-cego piloto

Objective: When provisional acrylic crowns are used for a long time, they become more susceptible to marginal leakage by cariogenic bacteria. The objectives of this pilot clinical study were to compare cement based on zinc oxide-eugenol and calcium hydroxide by contamination with Streptococcus mutans, and calculate the sample size for the continuation of this study. Methods: Individuals receiving provisional crowns and following inclusion/exclusion criteria, were randomly distributed into 2 groups: zinc oxide-eugenol (n=8); calcium hydroxide (n=9). The temporary crowns were made by a blind researcher and cemented by another. Patients were also blinded by the cement used inside their crowns. After 2 months, a cement sample from the crowns' peripheral inner face was collected, placed in a tube containing 1 mL of sterile saline, serially diluted, plated on Mitis Salivarius Bacitracin agar, and incubated for 48 hours. Colony-forming units (CFU/mL) were counted. A statistical power analysis was performed to calculate sample size (1-ß=80%) and the Mann Whitney test to compare both cements (α=0.05). Results: Both cements were contaminated with S. mutans, with an average of 166.6 x 102 CFU/mL for calcium hydroxide and 435.3 x 102 CFU/mL for zinc oxide-eugenol, with no significant difference (p=0.311). The sample size calculated for this study was 36 per group. Conclusion: This pilot study suggests that there is important contamination inside provisional crowns used for two months, independent of the cement. The continuation of this study is needed, with a bigger sample size, to enable a comparison between the cements.

Objetivo: Quando coroas dentais provisórias são utilizadas por um longo período, elas se tornam susceptíveis à infiltração marginal por bactérias cariogênicas. O objetivo deste estudo clínico piloto foi comparar os cimentos a base de óxido de zinco e eugenol e hidróxido de cálcio pela contaminação com Streptococcus mutans e calcular o tamanho amostral para continuação deste estudo. Métodos: Indivíduos recebendo coroas provisórias e seguindo critérios de inclusão/exclusão, foram distribuídos aleatoriamente em dois grupos: óxido de zinco e eugenol (n=8); hidróxido de cálcio (n=9). As coroas provisórias foram feitas por um pesquisador cego e cimentadas por outro. Os pacientes também foram cegos quanto ao cimento utilizado dentro de suas coroas. Depois de 2 meses, amostras de cimentos foram coletadas da face interna periférica das coroas, colocadas em um tubo contendo 1 mL de solução salina estéril, diluídas de forma seriada, plaqueadas em ágar Mitis Salivarius Bacitracina e incubadas por 48 horas. Unidades formadoras de colônias (UFC/mL) foram contadas. Um teste de poder estatístico foi realizado para calcular o tamanho amostral (1-ß=80%) e o teste de Mann Whitney para comparar os dois cimentos (α=0.05). Resultados: Os dois cimentos foram contaminados com S. mutans, com uma média de 166.6 x 102 UFC/mL para o hidróxido de cálcio e 435.3 x 102 UFC/mL para o óxido de zinco e eugenol, com nenhuma diferença significativa (p=0.311). O cálculo amostral para este estudo foi 36 indivíduos por grupo. Conclusão: Este estudo piloto sugere que existe importante contaminação dentro de coroas provisórias utilizadas por 2 meses, independente do cimento. A continuação deste estudo é necessária, com maior tamanho amostral, para possibilitar a comparação entre os cimentos.

Orofacial pain secondary to acoustic neuroma-A case report.

AIM: The present study aimed to report a case of orofacial pain secondary to acoustic neuroma (AN). METHODS AND RESULTS: A 66-year-old female presented with unilateral facial pain and odontalgia. The pain was described as throbbing, dull, and constant. Tinnitus, hearing loss, dizziness, and others symptoms were also present. Due to the characteristics of the pain and clinical or radiographic findings, other possible diagnoses, such as temporomadibular disorder, tooth-related pain, sinusitis, and primary headaches, were excluded. Somatosensory tests for allodynia and hyperalgesia showed extraoral and intraoral hypersensitivity. Magnetic resonance imaging revealed a lesion located on the right cerebellopontine angle extending into and obliterating the internal auditory canal and compressing the middle cerebral peduncle, the pons, and the cisternal segment of cranial nerve V. The patient was diagnosed with a brainstem tumor compatible with AN and trigeminal neuralgia secondary to cranial nerve V compression. CONCLUSION: Although uncommon, intracranial tumors should be considered during orofacial pain evaluation to avoid iatrogenic treatment and delayed diagnosis.

Autopercepção da qualidade de vida relacionada com a saúde bucal de idosos em Fortaleza, Ceará / Self-perceived quality of life related to the oral health of the elderly in Fortaleza, Ceará

Objetivo: avaliar a autopercepção da qualidade de vida e sua associação com as condições de saúde bucal de idosos institucionalizados e não institucionalizados. Método: estudo epidemiológico, transversal, tendo como público-alvo idosos com mais de 60 anos de uma Instituição de Longa Permanência para Idosos (Ilpi) (n=23) e de um grupo de convivência de idosos (n=22), ambos localizados em Fortaleza, CE. Para a análise da autopercepção em saúde bucal, foi utilizado o índice Geriatric Oral Health Index (GOHAI). Para avaliar o nível de dependência, foi aplicado o Índice de Barthel, já para analisar o estado cognitivo, utilizou-se o teste de Pfeiffer. Resultados: a pontuação média dos valores do índice GOHAI foi de 32,6; entretanto, foi percebido um alto número de edêntulos, já que apenas 17,7% da amostra possuía 20 dentes ou mais na boca. Percebeu-se que os idosos analfabetos e aqueles que utilizavam prótese total inferior estavam mais satisfeitos com a sua saúde bucal, enquanto que outros fatores socioambientais não apresentaram valores estatisticamente significantes. Conclusão: a autopercepção é um conceito variável e subjetivo, que nem sempre representa as reais necessidades clínicas do indivíduo.(AU)

Objective: evaluate the self-perception of oral health- related quality of life of institutionalized and non-institutionalized elderly. Method: A cross- -sectional epidemiological study was carried out, targeting elderly people over 60 years old from a long-term care institution - LSIE (n = 23) and from an elderly living group (n = 22), both located in Fortaleza - CE. For the analysis of self-perception in oral health, the GOHAI (Geriatric Oral Health Index) index was used. To assess the level of dependence, the Barthel test was applied, while the Pfeiffer test was used to analyze cognitive status. Results: The average score of the GOHAI index values was 32.6; however, a high number of edentulous was observed, as only 17.7% of the sample had 21 or more teeth in the mouth. It was noticed that illiterate elderly and those who used lower total prosthesis were more satisfied with their oral health while other socioenvironmental factors did not present statistically significant values. Conclusion: that self-perception is a variable and subjective concept that does not always represent the real clinical needs of the individual.(AU)

Combining different ceramic systems and periodontal microsurgery in maxillary esthetic areas: a case report.

Oral rehabilitations in esthetic regions may be challenging when different prosthodontic modalities must be combined with interventions on gingival tissues to create a harmonious smile for the patient. This case report describes the treatment of a 36-year-old man with an esthetically compromised maxillary anterior region by means of periodontal microsurgery, an implant-supported dental prosthesis, and tooth-supported crowns. Combined esthetic-functional planning based on clinical and radiographic examinations, photographs, and a diagnostic wax-up led to correction of the gingival contour and thickness by means of periodontal microsurgery; customization of an implant-supported zirconia abutment with the application of feldspathic porcelain; fabrication of a lithium disilicate ceramic infrastructure to mask darkened substrate; and fabrication of lithium disilicate ceramic definitive restorations. Five years after cementation of the restorations, the results remained stable. Careful treatment planning allowed the achievement of a satisfactory, predictable, and long-lasting esthetic result.

The Effect of a Continuous Mechanical Polishing Protocol on Surface Roughness, Biofilm Adhesion, and Color Stability of Acrylic Resin Artificial Teeth.

PURPOSE: Acrylic resin properties are susceptible to change over the duration of use, thereby decreasing prosthesis longevity. To make the material less susceptible to the action of external agents such as stain-causing liquids and cleaning solutions, polishing procedures are recommended. A specific mechanical polishing procedure performed regularly was evaluated regarding the biofilm adhesion, surface roughness (Ra), color stability (ΔE), and mass changes in acrylic resin artificial teeth. MATERIALS AND METHODS: Sixty artificial teeth divided into two groups (n = 30) were immersed in distilled water (WT) and coffee (CF). These groups were then subdivided (n = 10) according to the type of polishing procedure administered: no polishing, biweekly polishing (once every 2 weeks) (pol 1), or monthly polishing (once a month) (pol 2), using aluminum oxide paste and a felt polishing wheel attached to an electric motor at a speed of 3000 rpm. Properties were evaluated at baseline and after 4, 8, 12, and 24 months of simulated immersion. At the end, the adhesion of Candida albicans and Streptococcus mutans multispecies biofilm in all groups was assessed. RESULTS: The CF group showed an increased Ra and weight, and a significantly greater ΔE compared to the WT group. The polishing procedure reduced Ra and minimized the stains caused by coffee, without losing mass, with the biweekly regime more effective than the monthly regime. Also, polishing reduced the adhesion of biofilm in the CF groups, again with the biweekly regime the most effective. CONCLUSIONS: When performed regularly, the mechanical polishing procedure tested reduces the changes in artificial teeth subjected to immersion in coffee, with the biweekly frequency most effective regarding the properties evaluated.

Esthetics and function: a return to the basic concepts: case report / Estética e função: um retorno aos conceitos básicos: caso clínico

ABSTRACT Immediate esthetic rehabilitation is a common practice in contemporary restorative dentistry. Sometimes without a precise diagnosis and clinical planning, two or three clinical sessions have been sufficient to start and end an extensive all-ceramic oral rehabilitation. It is essential, however, for these treatments to be based on the biological, mechanical, and occlusal principles that have been established for decades, and not only on aesthetic considerations. In this case report, a 26 year-old bruxist patient with functional and aesthetic needs, was rehabilitated with ceramic restorations in the six maxillary anterior teeth, through an interdisciplinary approach. The diagnostic wax-up was essential to predict the outcome; guide the periodontal surgery; serve as a reference for dental preparations, and restore the dynamics of jaw movements. After the adhesive cementation, a protective occlusal splint for use during sleep was introduced. The authors concluded that careful diagnosis and planning was critical to outcome of this case, and that the quality and longevity of restorative treatment depended on the respect for biomechanical, occlusal, and aesthetic concepts.

RESUMO Reabilitações estéticas imediatas são práticas frequentes na Odontologia restauradora atual. Por vezes, sem um diagnóstico e um planejamento clínico preciso, duas ou três sessões clínicas têm sido o bastante para iniciar e finalizar uma reabilitação oral extensa totalmente cerâmica. Contudo é fundamental que esses tratamentos voltem a ser sustentados por princípios biológicos, mecânicos e oclusais básicos, instituídos há décadas, e não apenas por aspectos estéticos. No presente relato de caso, uma paciente de 26 anos, bruxista, com necessidades funcionais e estéticas, foi reabilitada com restaurações cerâmicas nos 6 dentes anteriores superiores, por meio de uma abordagem interdisciplinar. O enceramento diagnóstico realizado foi fundamental para prever o resultado, guiar a cirurgia periodontal, servir de referência para os preparos dentais e restaurar a dinâmica dos movimentos mandibulares. Após a cimentação final das restaurações, a proteção com placa oclusal no período do sono foi instituída. Concluiu-se que um criterioso diagnóstico e planejamento foi fundamental para o desfecho do caso, e que a qualidade e a longevidade desse tratamento restaurador parece depender intimamente do respeito aos conceitos biomecânicos, oclusais e estéticos.

Effect of restoration technique on stress distribution in extensively destroyed premolars: a finite element analysis study / Efeito da técnica restauradora na distribuição de tensões em pré-molares extensamente destruídos: uma análise por elementos finitos

ABSTRACT Objective: The objective of this study by the finite element method was to analyze the stress distribution on a single-rooted mandibular premolar tooth restored in two different ways. Methods: Laboratory simulation considered the following situations: 1) premolar restored with gold cast post and ceramic crown; 2) premolar restored with glass fiber post, composite resin core and ceramic crown. For this we used a two-dimensional model of a premolar with load application of 300N in the axial and oblique directions within the ANSYS program for Windows. Results: Under the axial load, a higher concentration of stresses was observed around the cast post (166 MPa). In the oblique load simulation, there was a concentration of stresses on the buccal root wall, internally and externally, in the tooth restored with cast post (222 MPa). In both load directions, the glass fiber post dissipated the stress received with greater uniformity (55 to 111 MPa). Conclusion: These data suggested that from the biomechanical point of view, the use of a glass fiber post and composite resin core could be more advantageous than the cast post technique for a mandibular single-rooted premolar tooth.

RESUMO Objetivo: Analisar, por meio do método dos elementos finitos, a distribuição de tensões em elemento dental pré-molar inferior unirradicular restaurado de duas maneiras distintas. Métodos: A simulação laboratorial considerou as seguintes situações: 1) pré-molar restaurado com núcleo metálico fundido em liga áurea e coroa em cerâmica; 2) pré-molar restaurado com pino de fibra de vidro, núcleo de preenchimento em resina composta e coroa em cerâmica. Para isso foi utilizado um modelo bidimensional de um pré-molar com aplicação de carga de 300N nas direções axial e oblíqua com uso de programa ANSYS para Windows. Resultados: Diante da carga axial, foi observada uma maior concentração de tensões na região do núcleo fundido (166 Mpa). Na simulação de carga oblíqua, observou-se uma concentração de tensões na parede radicular vestibular, interna e externamente, no dente restaurado com núcleo fundido (222 Mpa). Nas duas situações em estudo, o pino de fibra de vidro e núcleo de preenchimento dissipou, com maior uniformidade, a tensão recebida (55 a 111 Mpa). Conclusão: Esses dados sugerem que o uso de pino de fibra pré-fabricado e núcleo de preenchimento em resina composta pode ser mais vantajoso que a indicação de núcleo fundido, sob o ponto-de-vista biomecânico, em dente pré-molar inferior unirradicular.

Alkaline Peroxides Versus Sodium Hypochlorite for Removing Denture Biofilm: a Crossover Randomized Trial.

This study evaluated the efficacy of cleanser solutions on denture biofilm removal by a crossover randomized clinical trial. Thirty two edentulous patients were instructed to brush their dentures (specific brush and liquid soap) three times a day (after breakfast, lunch and dinner) and to soak them (≥ 8 h) in: (C) control -water; (AP): alkaline peroxide; or (SH) 0.5% sodium hypochlorite. Each solution was used for 21 days (three cycles of 7 days). At the end of each cycle, the inner surfaces of maxillary dentures were disclosed (1% neutral red) and photographed (HX1 - Sony). Areas (total and stained biofilm) were measured (Image Tool software) and the percentage of biofilm calculated as the ratio between the area of the biofilm multiplied by 100 and total surface area of the internal base of the denture. Data were compared by means of generalized estimating equation (α=5%) and multiple comparisons (Bonferroni; α=1.67%). Immersion in SH reduced biofilm (%) (8.3 ± 13.3B) compared to C (18.2 ± 14.9A) and AP (18.2 ± 16.6A). The 0.5% sodium hypochlorite solution was the most efficacious for biofilm removal. Alkaline peroxides may not lead to further biofilm removal in patients with adequate denture maintenance habits.

Alkaline Peroxides Versus Sodium Hypochlorite for Removing Denture Biofilm: a Crossover Randomized Trial

Abstract This study evaluated the efficacy of cleanser solutions on denture biofilm removal by a crossover randomized clinical trial. Thirty two edentulous patients were instructed to brush their dentures (specific brush and liquid soap) three times a day (after breakfast, lunch and dinner) and to soak them (≥ 8 h) in: (C) control -water; (AP): alkaline peroxide; or (SH) 0.5% sodium hypochlorite. Each solution was used for 21 days (three cycles of 7 days). At the end of each cycle, the inner surfaces of maxillary dentures were disclosed (1% neutral red) and photographed (HX1 - Sony). Areas (total and stained biofilm) were measured (Image Tool software) and the percentage of biofilm calculated as the ratio between the area of the biofilm multiplied by 100 and total surface area of the internal base of the denture. Data were compared by means of generalized estimating equation (α=5%) and multiple comparisons (Bonferroni; α=1.67%). Immersion in SH reduced biofilm (%) (8.3 ± 13.3B) compared to C (18.2 ± 14.9A) and AP (18.2 ± 16.6A). The 0.5% sodium hypochlorite solution was the most efficacious for biofilm removal. Alkaline peroxides may not lead to further biofilm removal in patients with adequate denture maintenance habits.

Resumo Este estudo avaliou a eficácia de soluções higienizadoras na remoção do biofilme de dentadura por meio de ensaio clínico randomizado cruzado. Trinta e dois pacientes desdentados foram instruídos a escovar suas dentaduras (escova específica e sabão líquido) três vezes ao dia (após café da manhã, almoço e jantar) e imergi-las (≥ 8 horas) em: (C) controle - água; (PA): peróxido alcalino; ou (HS) hipoclorito de sódio a 0,5%. Cada solução foi usada por 21 dias (três ciclos alternados de 7 dias). Ao final de cada ciclo, a superfície interna da dentadura maxilar foi evidenciada (vermelho neutro 1%) e fotografada (HX1- Sony). As áreas (total e corada com biofilme) foram medidas (software Image Tool), e a porcentagem de biofilme calculada como a relação entre a área do biofilme multiplicado por 100 e área da superfície total da base interna da dentadura. Os dados foram comparados por meio de equações de estimação generalizadas (α=5%) e comparações múltiplas (Bonferroni - α=1,67%). A imersão em HS reduziu o biofilme (%) (8,3 ± 13,3B) em comparação com C (18,2 ± 14,9A) e PA (18,2 ± 16,6A). A solução de hipoclorito de sódio a 0,5% foi a mais eficaz na remoção do biofilme. Peróxidos alcalinos podem não levar a maior remoção do biofilme em pacientes com hábitos adequados de manutenção de dentadura.

A randomized trial on simplified and conventional methods for complete denture fabrication: cost analysis.

PURPOSE: This study aimed to quantify the costs of complete denture fabrication by a simplified method compared with a conventional protocol. MATERIALS AND METHODS: A sample of edentulous patients needing conventional maxillary and mandibular complete dentures was randomly divided into group S, which received dentures fabricated by a simplified method, and group C, which received conventionally fabricated dentures. We calculated direct and indirect costs for each participant including unscheduled procedures. This study assessed 19 and 20 participants allocated into groups S and C, respectively, and comparisons between groups were conducted by the Mann-Whitney and Student's t-test (α = 0.05). RESULTS: Complete denture fabrication demanded median time periods of 173.2 and 284.5 minutes from the operator for groups S and C respectively, and 46.6 and 61.7 minutes from the dental assistant (significant differences, p < 0.05). There was no difference between groups regarding postinsertion adjustments. Group S showed lower values for costs with materials and time spent by patients than group C during the fabrication stage, but not during adjustments. CONCLUSIONS: The median direct cost of complete denture treatment was 34.9% lower for the simplified method. It can be concluded that the simplified method is less costly for patients and the health system when compared with a conventional protocol for the rehabilitation of edentulous patients.