Steel drills versus zirconia drills on heat generation at the surgical site of dental implants: A systematic review and meta-analysis.

Objective: The aim was to evaluate the difference in the heat generated between zirconia (Zr) and steel (SS) drills, during implant site preparation. Material and methods: This systematic review followed the PRISMA methodology criteria and used the JBI Critical Assessment Guidelines for Quasi-Experimental Studies for quality assessment. The electronic search was conducted by using the PubMed/MEDLINE, Embase, and Cochrane Library databases to January 2023. The formulated population, intervention, comparison, outcome (PICO) question was "Do zirconia drills generate less heat than steel drills during implant site preparation?". The meta-analysis was based on an inverse variance (IV) method. Results: This review included 10 studies in vitro that used zirconia drills compared to steel drills with or without coatings. The meta-analysis indicated a significant difference between Zr drills and SS drills, with a lower bone temperature variation with Zr drills. Conclusions: Despite the limitations of this review, it was concluded that Zr drills had significantly less temperature variation than SS drills.

Prevalence of anophthalmia etiological factors in patients treated in a reference center: A retrospective study.

Background: Ocular prosthesis rehabilitation has an important social, psychological, esthetic, and functional role. Congenital factors, trauma, and tumors, among others, can cause anophthalmia, and it is essential to identify the etiology to guide its prevention and treatment. Methods: The aim of this study was to retrospectively investigate the records of patients treated from 2013 to 2020 by the Oral and Maxillofacial Prosthesis Group, aiming to identify the prevalence of patients with anophthalmia and the etiology of their anophthalmia. After approval by the Human Research Ethics Committee, two calibrated researchers evaluated 520 records, identifying those from patients with anophthalmia. The inclusion criteria were records with complete and legible information from patients with anophthalmia and a description of their etiology. Descriptive statistics were performed, and etiological factors were categorized into trauma, congenital cause, end-stage eye disease, and tumor. Spearman's correlation was performed to verify the relation between gender and anophthalmia etiology, with a 5% significance level. Seventy-two records were included in the study. Results: It was observed that 33.4% of patients were women and 66.6% were men. The etiologies were physical trauma (52.4%), tumor (21.8%), end-stage eye disease (16.6%), and congenital cause (9.2%), and there was no correlation between gender and these etiologies (p = .301). Conclusion: Most of the cases identified were of traumatic origin, which allows the establishment of preventive and educational measures to avoid new cases of anophthalmia.

Effects of rehabilitation with complete dentures on bite force and electromyography of jaw and neck muscles and the correlation with occlusal vertical dimension.

OBJECTIVES: The purpose of this study was to assess the effects of oral rehabilitation with complete dentures on bite force and electromyography of the suprahyoid and sternocleidomastoid muscles, and their correlation with occlusal vertical dimension (OVD). The research questions were "What are the effects of rehabilitation with complete dentures on bite force and electromyography of suprahyoid and sternocleidomastoid muscles, and how are they correlated with OVD?" MATERIALS AND METHODS: Patients who are wearers of unsatisfactory removable complete dentures were attended in three sessions (T0, T1, and T2). At T0, while the patients still wore the old dentures, they were submitted to bite force and surface electromyographic exams of the suprahyoid and sternocleidomastoid muscles. These exams were repeated, and the OVD was measured while the patients wore their old and new prostheses, 30 days after insertion of the new prosthesis (T1). The exams were repeated 100 days after the insertion of the new prosthesis (T2). The data were submitted to the Shapiro-Wilk normality test, analysis of variance (ANOVA), and Pearson correlation and linear regression, all with 5% significance. RESULTS: Fifteen patients participated in the study. No statistically significant difference was observed for bite force or electromyography in T0, T1, or T2. However, the correlation and regression tests showed important interactions between the OVD and maximum voluntary occlusal bite force, as well as the OVD and electromyography during deglutition for the suprahyoid muscles. CONCLUSION: Rehabilitation did not impact bite force nor the activity of the assessed muscles (electromyography). On the other hand, OVD was shown to be an important factor for bite force, and deglutition of water after rehabilitation. CLINICAL RELEVANCE: This study shows what are the influences of rehabilitation on oral functions and reinforces the importance of corrected reestablishment of OVD because it has been found to be an important factor for bite force and electromyography during deglutition.

Analysis of physical properties of facial silicones with different pigmentations submitted to nonthermal plasma treatment and accelerated aging.

STATEMENT OF PROBLEM: Exposure of silicone prostheses to environmental factors can alter their properties, affecting longevity. However, whether nonthermal plasma (NTP) can prevent these alterations is unclear. PURPOSE: The purpose of this in vitro study was to evaluate the surface roughness (Ra), sorption, solubility, and color stability (ΔE00) of the MDX4-4210 and A-120 silicones, with and without NTP treatment in accordance with an independent analysis of the use of 2 pigmentations. MATERIAL AND METHODS: One hundred sixty specimens were fabricated and distributed into 16 groups (n=10) as per the silicone, pigmentation, and NTP coating. The NTP was applied, and the Ra, sorption, solubility, and ΔE00 were evaluated before and after accelerated aging. ANOVA was used, and the HSD Tukey test was applied (α=.05). RESULTS: NTP generated an increase in roughness after aging, regardless of pigmentation or silicone. A-120 silicone without NTP showed a reduction in roughness after aging, regardless of pigmentation. For sorption and solubility, the bronze pigmentation (for A-120 and MDX4-4210) presented the smallest results after NTP treatment. For MDX4-4210 with pink pigmentation and NTP, sorption decreased and solubility increased. For A-120 with pink pigmentation and NTP, sorption and solubility increased. Sorption was reduced in all situations, except for A-120 with pink pigmentation, which increased. Regardless of the silicone used, solubility was reduced after NTP for bronze pigmentation. For A-120 and MDX4-4210 with pink pigmentation and NTP, the solubility increased. For both pigmentations, the NTP treatment promoted lower color alteration only for the A-120 silicone after accelerated aging (within the acceptability threshold). CONCLUSIONS: The NTP protocol of this study, which was applied to facial silicones, generated inconsistent results between the evaluated properties. Therefore, the NTP protocol used does not seem to be ideal for the treatment of silicone surfaces after aging.

Tear Strength Analysis of MDX4-4210 and A-2186 Silicones with Different Intrinsic Pigments Incorporated by Mechanical and Industrial Methods.

OBJECTIVE: The aim of this study was to evaluate the tear strength of MDX4-4210 and A-2186 silicones with different intrinsic pigments incorporated by mechanical and industrial methods, comparing nonaged and aged groups. MATERIALS AND METHODS: Twenty-four groups were created according to the American Society for Testing and Materials D-624/type C, half nonaged and half aged (n = 10): bronze mechanical MDX4-4210, bronze industrial MDX4-4210, black mechanical MDX4-4210, black industrial MDX4-4210, pink mechanical MDX4-4210, pink industrial MDX4-4210, bronze mechanical A-2186, bronze industrial A-2186, black mechanical A-2186, black industrial A-2186, pink mechanical A-2186, and pink industrial A-2186. All specimens were submitted to tear strength analysis. Data were submitted to the ANOVA and Tukey test (p < 0.05). RESULTS: An increase in the tear strength values was observed only for the bronze and black MDX4-4210, comparing nonaged and aged silicones (p < 0.05), regardless of the manufacturing method. There was a difference in all comparisons between MDX4-4210 and A-2186 silicones with the same pigment type (p < 0.05), regardless of the manufacturing method. In all cases, there was no difference in the manufacturing method comparing the MDX4-4210 or A-2186 groups with the same pigment. CONCLUSION: Accelerated aging did not influence the tear strength in all aged A-2186 silicones and in aged pink industrial and mechanical MDX4-4210 silicones. The other MDX4-4210 groups had an increase in the results after aging. In all cases compared, the A-2186 groups had higher tear strength values than the MDX4-4210 groups. Mechanical and industrial methods can be used for silicone preparation, without changing the tear strength.

Relationship Between Implant Stability Measurements Obtained by Two Different Devices: A Systematic Review.

BACKGROUND: The aim of this systematic review is to evaluate the relationship between two methods used to assess implant stability, investigating whether both provide similar implant stability assessments for the same clinical case. METHODS: A literature search was conducted on MEDLINE-PubMed and Scopus databases, without limitation of the publication period, up to November 2015. The following key words were used, with associations among them: "dental implant," "dental implants," "Osstell," "resonance frequency analysis," "implant stability quotient," "ISQ," "Periotest," "Periotest value," and "PTV." Inclusion criteria were English language, prospective, retrospective, and randomized controlled clinical trials that evaluated implant stability through use of resonance frequency analysis (RFA) and damping capacity analysis (DCA). The study should assess implant stability of only a specific region for all patients or discriminate results evaluated for each region if the analysis had been made in various regions; RFA and DCA should have been applied in the same implants and periods. Studies have been carefully selected, and data of interest were tabulated. RESULTS: Six studies met the inclusion criteria. Although there was significant numerical correlation between values obtained by both methods, data showed that less than half (46%) of cases coincided in relation to implant stability classification. CONCLUSIONS: It can be considered that there is not always a consensus and standardization in the classification of implant stability related to the values obtained by RFA and DCA devices, which could create disagreements and miscommunication among dentistry professionals.

Color stability of maxillofacial silicone with nanoparticle pigment and opacifier submitted to disinfection and artificial aging.

The purpose of this study was to evaluate the color stability of a maxillofacial elastomer with the addition of a nanoparticle pigment and∕or an opacifier submitted to chemical disinfection and artificial aging. Specimens were divided into four groups (n = 30): group I: silicone without pigment or opacifier, group II: ceramic powder pigment, group III: Barium sulfate (BaSO(4)) opacifier, and group IV: ceramic powder and BaSO(4) opacifier. Specimens of each group (n = 10) were disinfected with effervescent tablets, neutral soap, or 4% chlorhexidine gluconate. Disinfection was done three times a week during two months. Afterward, specimens were submitted to different periods of artificial aging. Color evaluation was initially done, after 60 days (disinfection period) and after 252, 504, and 1008 h of artificial aging with aid of a reflection spectrophotometer. Data were analyzed by three-way ANOVA and Tukey test (α = 0.05). The isolated factor disinfection did not statistically influence the values of color stability among groups. The association between pigment and BaSO(4) opacifier (GIV) was more stable in relationship to color change (△E). All values of △E obtained, independent of the disinfectant and the period of artificial aging, were considered acceptable in agreement with the norms presented in literature.

Patient satisfaction with maxillofacial prosthesis. Literature review.

SUMMARY: Obturators and facial prostheses are important not only in rehabilitation and aesthetics, but also in patient re-socialisation. The level of reintegration is directly related to the degree of satisfaction with rehabilitation. So, the maxillofacial prosthetics must provide patient satisfaction during treatment. This study aimed to search information in database and conduct a literature review on patient satisfaction with maxillofacial prosthesis. The problems experienced by these patients may decrease when specialists keep the patient on regular inspection. Rehabilitation through alloplasty or prosthetic restoration provides satisfactory conditions in aesthetics and well-being and reinstates individuals in familial and social environment.

Evaluación de la dureza shore a en dos técnicas de impresión con siliconas por condensación bajo la influencia del uso de desinfección química por impresión con solución de clorhexidina al 2 por ciento / Evaluation of hardness in two impression techniques with condensation silicones under influence chemical disinfection with clorhexidine 2 percent

Las siliconas de polimerización por condensación, actualmente, son muy utilizadas en el mercado odontológico. Debido a este hecho, nuestro objetivo fue estudiar la dureza Shore A de dos siliconas de condensación (Zetaplus - Zhermark y Clonage - DFL), simulando dos técnicas de impresión (densa y densa + fluida) bajo la influencia de desinfección química con solución a base de clorhexidina al 2 por ciento (aspersión por 5 minutos). Fueron confeccionados 56 muestras, a partir de matrices metálicas, divididos en 4 grupos para cada técnica de impresión, siendo la mitad de las muestras de cada técnica sometidas a desinfección química. El Test de dureza fue realizada por medio de un durómetro (modelo GSD 709) de acuerdo con las especificaciones D-2240 de la Sociedad Americana para Prueba y Materiales (ASTM), los resultados obtenidos, fueron analizados por medio del Test de análisis de varianza y al Test de Tukey (p<0,05). Se concluyó, que para cualquier condición experimental estudiada se encontró diferencia estadísticamente significativa cuando se analizaron los valores medios de desinfección química, tipo de material y técnica utilizada

Elastomerics materials currently represent a major choice in the dental market as an impression material. The aim of this study was to asses Shore A hardness of two condensation silicones (Zetaplus - Zhermack and Clonage - DFL) using two impression techniques (putty and putty/wash) under influence of chemical disinfection with clorhexidine spray to 2 percent (for five minutes). Fifty-six specimens were made in metallic matrices, subdivided in 4 groups for each impression technique; half of each technique was submitted to chemical disinfection. Hardness test was performed with a durometer (GSD 709) according ASTM specifications (D-2240), the results were submitted to analyses of variance (ANOVA) and Tukey’s test (p<0.05). It was concluded that for all experimental condition, difference statistically significant was found

Influencia del tiempo de almacenamiento sobre la dureza y rugosidad de materiales para rebasados resilentes / Influence of storage time on the hardness and roughness of soft liners materials

Fundamento: Los materiales para rebasados resilentes de prótesis, presentan ciertas características clínicamente importantes que pueden alterarse con el tiempo de uso, entre ellas la dureza, y rugosidad. El objetivo de este estudio fue evaluar la influencia del almacenamiento sobre la dureza Shore A y rugosidad de cuatro materiales resilentes para rebasado. Materiales y método: Fueron utilizados 4 materiales resilentes: Dentuflex, Coe-Soft, Dentusoft y Dinabase, 3 temporales y un permanente; para cada material fueron confeccionadas 7 muestras. Se evaluó la dureza y rugosidad inicialmente, a los 30 y 90 días de almacenamiento en agua destilada a 35±2ºC. Los resultados fueron sometidos al análisis de varianza (ANOVA) y las medias comparadas por el Test de Tukey (p<0,05). Resultados: Dentuflex, Coe-Soft, Dentusoft y Dinabase presentaron los mayores valores medios iniciales de dureza, en este orden. Con respecto a la rugosidad, Dentuflex, Dentusoft, Coe-Soft y Dinabase presentaron los mayores valores medios iniciales. Después del periodo de almacenamiento se observó un aumento significativo de los valores de dureza en todos los materiales. El material Dentuflex presentó valores de rugosidad significativamente menores, mientras que los valores de los otros materiales aumentaron significativamente. Conclusión: El tiempo de almacenamiento influenció sobre la dureza y rugosidad todos los materiales (AU)

Statement of problem: Resilient soft liners materials have many important features that could be altered over time, like hardness and roughness. The aim of this study was to assess the influence of water storage on the hardness Shore A and roughness of four resilient soft liners materials. Materials and methods: Four materials were used: Dentuflex, Coe-Soft, Dentusoft and Dinabase, three temporary and one permanent material. For each material 7 specimens were made. The hardness and the roughness were evaluated in the initial period, after 30 and 90 days of distilled water storage at 35±2ºC. The results were submitted to analyses of variance (ANOVA) and the averages compared by Tukey's Test (p<0.05). Results: Dentuflex, Coe-Soft, Dentusoft and Dinabase displayed higher initial average of hardness values, whereas Dentuflex, Dentusoft, Coe-Soft and Dinabase higher initial average of roughness values. After water storage a significant increase in the hardness values in all materials was observed. Dentuflex material showed smaller roughness values, while the other materials increased significantly. Conclusion: Time storage influenced all the materials analyzed with respect to hardness and roughness (AU)