It can be concluded that TiZr NDIs present similar success rates and peri-implant bone resorption to cpTi NDIs.

Aim:The aim of this systematic review was to compare the survival rate and the marginal bone loss between short implants (≤7 mm) placed in the atrophic area and longer implants placed in the augmented bone area of posterior regions of maxillaries.Methods:Electronic search using three databases was performed up to May 2017 to identify Randomized Controlled Trials (RCT) assessing short implants survival with a minimal follow-up of 12 months post-loading. For the meta-analysis, a Risk Difference (RD) with the 95% Confidence Interval (CI) was used to pool the results of implant failure rate for each treatment group. For the marginal bone changes, Mean Differences (MD) with 95% CI were calculated.Results:Seven randomized controlled trials met the inclusion criteria, being included in qualitative and quantitative analyses. The RD between the short implant group and the control group was -0.02 (95% CI: -0.04 to 0.00), I2=0 and Chi2=3.14, indicating a favorable survival rate for short implant, but with no statistical significance (p=0.09).Discussion:For marginal bone loss, the mean difference was -0,13 (95%CI: -0.22 to -0.05), favoring the test group with statistical significance (p=0.002). The studies showed more heterogeneity for bone loss compared to survival rate. Short and longer implants showed similar survival rates after one year of loading, however the marginal bone loss around short implants was lower than in longer implants sites.Conclusion:Placement of implants ≤7 mm of length was found to be a predictable alternative for the rehabilitation of atrophic posterior regions, avoiding all the disadvantages intrinsic to bone augmentation procedures.

No abstract

According to the results, there were no differences (p < 0.05) in the masticatory efficiency of the complete denture sets using teeth with the two cusp heights.

Different types of artificial teeth and occlusal designs can be used in complete dentures. Bilateral balanced occlusion, lingualized occlusion, canine guidance, and monoplane are the main occlusal designs; however there is no agreement on which tooth arrangement is ideal for achieving success in complete dentures. This report presents an alternative for persistent involuntary protruding complete denture wearers through the use of artificial teeth with higher cusps. Due to an old and worn pair of complete dentures, the patient had the habit of protruding. New dentures were made with Biotone artificial teeth and in the trial session, the patient would still protrude. A new set was made with Premium artificial teeth, which present higher cusps. With these dentures, the involuntary protrusion did not occur. From the delivery to the follow-up sessions, the patient stopped protruding.

| Objective:Hardness is an indicator of several mechanical properties of artificial teeth, also related to wear resistance.The purpose of this article is to map the microhardness of artificial teeth as a function of depth and commercial brand. Methods: Knoop microhardness of sectioned artificial second molars was measured every 200 µm starting at a depth of 100 µm up until 4700 µm of the following brands: Premium (Pr), Orthosit (Or), SR Postaris DCL (Po), Biotone (Bi), Artiplus IPN (Ar), VITA MFT (Vi), Natusdent (Na), Trilux (Tr), and Biolux (Bx). Results were analyzed with ANOVA for repeated measures and Tukey test (5%). Results: SR Orthosit PE commercial brand presented higher hardness values (until the depth of 3.1 mm was 30 N/mm 2 ), significantly higher than the other brands analyzed. Conclusion: Knoop hardness did not present differences between layers for eight of the nine brands studied. Different hardness values were found between superficial and cervical areas for the brand SR Orthosit PE.DESCRIPTORS | Artificial Tooth; Hardness; Acrylic Resins. RESUMO | Microdureza de dentes artificiais em suas diferentes camadas • Objetivo:A dureza é tida como indicador de várias propriedades mecânicas de dentes artificiais, e relacionada a resistência ao desgaste. O objetivo foi mapear a microdureza de dentes artificiais de 9 marcas em função da profundidade. Métodos: foi medida a microdureza Knoop de segundos molares cortados num plano sagital em intervalos de 200 µm a partir da profundidade de 100 µm até 4700 µm, das marcas: Premium (Pr), Orthosit (Or), SR Postaris DCL (Po), Biotone (Bi), Artiplus IPN (Ar), VITA MFT (Vi), Natusdent (Na), Trilux (Tr) and Biolux (Bx). A ANOVA de medidas repetidas e o teste de Tukey (5%) analisaram os resultados. Resultados: A marca SR Orthosit PE apresentou a maior dureza (até a profundidade de 3,1 mm foi da ordem de 30 N/mm 2 ), significativamente maior que todas as outras medidas realizadas (da ordem de 20 N/mm 2 ). Conclusão: A dureza Knoop não evidenciou diferenças entre camadas para oito das nove marcas estudadas. Foi constatada diferente dureza entre a superfície e a região cervical para a marca SR Orthosit PE. DESCRITORES |

The aim of this study was to analyze the wear behavior of the layers of artificial teeth corresponding to the enamel and dentine by means of micro-abrasive wear with "ballcratering". Upper central incisors of six artificial teeth commercial brands were used to confection of the test specimens (Premium, Magister, Vivodent PE, Biotone, Artiplus IPN e Trilux). The total number of samples was five to each commercial brand. To analyze the artificial teeth wear coefficient, the micro-abrasive wear testing was performed according to Distance sliding (S) and normal Force (N), under conditions of constant N. The wear craters were made without intermediate stops in order to obtain the evolution of craters diameter in accordance to in the experiment duration. The testing times were: 5; 8,33 and 11,66 minutes, the points to the testing execution were chosen randomly. Three repetitions were used for each testing condition. Craters were analyzed with optical microscopes and measurements were taken with the software ©Leica Microsytems. For all analyses data distribution normality and homogeneity were tested. "Analysis of Variance" (ANOVA) 2-factors and Tukey Test to multiple comparisons were calculated from the obtained values in t 3. The lowest and biggest values obtained of k were k=22,60.10 (Ar) and k=47,8.10 (Ma), respectively. In relation to brand factors (p=0.0012) and region (p=0.028) the differences were statistically significant, however regarding to brand x region (p=0.16) there was no significant difference. According to the results, it can be concluded that the behavior of the wear coefficient in all samples, enamel and dentin presented grooving abrasion. Also, it was possible to observe differences in wear behavior of brands of acrylic resin artificial teeth and its layers. The micro-abrasive wear with "ball-cratering" test is appropriate for the study of polymeric materials in Dentistry.