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BACKGROUND: This systematic review and meta-analysis aimed to evaluate the wear of the antagonist tooth in ceramic restorations. MATERIAL AND METHODS: This study was carried out based on Preferred Reporting Items for Systematic Review and Meta-analysis (PRISMA) recommendations; it was also registered in PROSPERO (register number: CRD42022316252). Three databases were consulted in the literature search, Embase, Scopus, and Web of Science. The citation searching was conducted by two researchers independently. The clinical studies that evaluated wear in antagonist teeth concerning ceramic restoration were included. Twelve articles were selected after eliminating duplicates ones and applying the inclusion criteria, and two were chosen through citation. Fourteen articles were considered for the qualitative and quantitative analysis (meta-regression and meta-analysis). RESULTS: The mean linear wear of the antagonist tooth in relation to feldspathic was 8.914 µm, for lithium disilicate it was 0.018 µm, and for zirconia it was 0.257 µm. The mean volumetric wear of the antagonist tooth in relation to feldspathic was 0.273 mm3, for hybrid ceramic it was 0.030 mm3, for lithium disilicate it was 0.018 mm3, and for zirconia it was 0.014 mm3. The mean natural tooth wear was 0.7974 µm per month. Tooth wear caused by zirconia at six months was 31.755 µm, at 12 months it was 24.648 µm, and at 24 months it was 20.662 µm. CONCLUSIONS: Feldspathic produces greater wear of the antagonist tooth from ceramic restorations linearly and volumetrically. In addition, zirconia generates the least wear that will decrease over time, and it will be equal to or less than the natural wear in the tooth.

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Background: To correlate the need for orthodontic treatment between the self-perception of Chilean adolescents from 14 to 18 years old with the observation of a dentist using the same assessment scale, as well as to determine if covariates such as gender, age and type of school influence the self-perception of the adolescent and the examiner. Material and Methods: Cross-sectional descriptive study of adolescents aged 14 to 18 years from public, subsidized and private schools in Temuco, Chile. The probability sample is stratified by course, from first to fourth year, a total of 414 students participated, according to the eligibility criteria. The photographic score of the aesthetic component (AC) of the Index of Orthodontic Treatment Need (IOTN) was used. The statistical analysis of the data was performed with the SPSS Statistics program v.23. Results: 94.9% of the adolescents perceived themselves as having good aesthetics. The examiner considered that 77% presented this condition, p<0.00. Males perceived themselves better than females. At age 15, 1.7% of students considered themselves to have poor aesthetics, p<0.01. From the examiner's perspective, aesthetics are related to type of school, p<0.00. Conclusion: Adolescents perceive themselves better aesthetically than do the evaluators. The school type factor, according to the IOTN-AC examiner, shows a higher proportion of students with no need for orthodontic treatment in private schools, and a threshold need in municipal and subsidized institutions.

Correlacionar la necesidad de tratamiento ortodóncico, entre la autopercepción de adolescentes con el diagnóstico de un evaluador odontólogo, utilizando la misma escala de valoración, así también determinar si las variables como el género, la edad y la dependencia educacional influyen en la autopercepción del adolescente y la observación del examinador. Material y Métodos: Estudio descriptivo de corte transversal, en adolescentes de 14 a 18 años de escuelas públicas, subvencionadas y privadas de Temuco-Chile. Muestreo probabilístico estratificado por cursos, de primero a cuarto medio con una muestra de 414 estudiantes, según los criterios de elegibilidad. Se utilizó el score fotográfico del componente estético (AC) del Índice de Necesidad de Tratamiento de Ortodoncia (INTO). El análisis estadístico de los datos fue realizado con el programa SPSS Statistics v.23. Resultados: El 94,9% de los adolescentes se autoperciben con una buena estética, el examinador considera que un 77% presenta esta condición, p<0,00. Los varones se perciben mejor que las damas. Los adolescentes de 15 años un 1,7% considera tener mala estética, p<0,01. Desde la perspectiva del examinador la estética se relaciona con la dependencia educacional, <0,01. Conclusión: Los adolescentes se autoperciben mejor estéticamente que lo diagnosticado por evaluadores odontólogos. El factor dependencia educacional según INTO-AC examinador, muestra mayor proporción de estudiantes sin necesidad de tratamiento ortodóncico en los establecimientos privados, y necesidad límite en los públicos y subvencionados.

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OBJECTIVE: This review aimed at evaluating the effects of chronic periodontitis (CP) treatment with local statins as adjuncts to scaling and root planing (SRP), compared with SRP alone or with placebo. METHODS: Electronic and hand searches were conducted in three databases to select randomized controlled trials (RCTs) comparing SRP + statins versus SRP alone. Random effects models were conducted to determine the clinical attachment level (CAL) gain as the primary outcome variable, and probing pocket depth (PPD) reduction, modified sulcus bleeding index (mSBI), and intrabony defect depth (IBD) as the secondary outcomes. RESULTS: Of the 526 papers identified, 15 articles met the criteria for inclusion in this systematic review, and 13 in the meta-analysis. The meta-analysis showed a statistically significant CAL gain (mean differences [MD] = 1.84 mm, 95% confidence interval [CI] = 1.45 to 2.23; p = 0.000), PPD reduction (MD = 1.69 mm, 95% CI = 1.37 to 2.04; p = 0.000), mSBI change (MD = 0.70, 95% CI = 0.57 to 0.84; p = 0.000), and IBD (MD = 1.48, 95% CI = 1.30 to 1.67; p = 0.000) attributed to SRP + statin treatment (6 months). CONCLUSION: Within the limitations of this study, the collective evidence emerging from this systematic review and meta-analysis may support the use of locally applied statins as adjuncts to SRP in CP treatment, based on being an easy, low-cost alternative, with lesser adverse effects on bacterial resistance. These results should be interpreted with caution. CLINICAL RELEVANCE: Clinicians might consider the use of SRP + statins as an adjunct over other alternative approaches, based on the results of the present review. The informed decision should be taken, considering the patient's values and preferences, and the intervention to be implemented by the clinician.

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