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1.
J Esthet Restor Dent ; 32(7): 726-733, 2020 Oct.
Artículo en Inglés | MEDLINE | ID: mdl-32886852

RESUMEN

OBJECTIVE: To evaluate the microtensile bond strength of four dental computer-aided design/computer-aided manufactured (CAD/CAM) ceramics after application of four different surface treatments. MATERIALS AND METHODS: Four dental CAD/CAM ceramics were tested: feldspathic ceramic (VITABLOCKS-Mark II), polymer-infiltrated ceramic network (VITA ENAMIC), zirconia-reinforced lithium silicate (VITA SUPRINITY), and yttria-stabilized zirconia (VITA YZ T). Four surface treatments were applied: no treatment, 5% hydrofluoric acid-etching, airborne particle abrasion, and tribochemical silica coating. The ceramic blocks were repaired with nanohybrid composite (Tetric N-Collection). Sixteen test groups of 12 specimens were prepared. After thermocycling, microtensile bond testing was performed. The microtensile strengths values were statistically analyzed using two-way analysis of variance and Tukey's post-hoc test. RESULTS: Repaired feldspathic and resin polymer-infiltrated ceramic network ceramics demonstrated superior microtensile bond strengths compared to zirconia-reinforced lithium silicate and yttria-stabilized zirconia. Etched feldspathic and polymer-infiltrated ceramic network ceramics had higher bond strength than the untreated groups. Surface treatments did not affect the bond strength of zirconia-reinforced lithium silicate and yttria-stabilized zirconia with the exception of etching, which reduced the bond strength of yttria-stabilized zirconia. CONCLUSION: Feldspathic ceramic and polymer-infiltrated ceramic network were repaired with dental composite after surface etching with hydrofluoric acid. Repair of zirconia-reinforced lithium silicate and yttria-stabilized zirconia did not demonstrate promising results. CLINICAL SIGNIFICANCE: Repair of feldspathic ceramic and polymer-infiltrated ceramic network restorations may be a cost-effective means to promote the longevity of dental restorations. However, zirconia and zirconia-reinforced lithium disilicate restorations do not offer such an option.


Asunto(s)
Recubrimiento Dental Adhesivo , Cerámica , Diseño Asistido por Computadora , Porcelana Dental , Análisis del Estrés Dental , Ensayo de Materiales , Cementos de Resina , Propiedades de Superficie , Circonio
2.
Heliyon ; 6(5): e03954, 2020 May.
Artículo en Inglés | MEDLINE | ID: mdl-32478186

RESUMEN

Objectives: To develop a comprehensive yet simple dental follow up and maintenance protocol based on existing guidelines and recommendations. Methods: A multidisciplinary team reviewed available maintenance and follow up guidelines and recommendations then developed a single protocol for adult dental patients. Results: The protocol includes ten questions that categorize dental patients into one of three risk categories. Based on the risk category, each patient is assigned a recall interval and recommendations for in office and at home dental care. Conclusions: Development of a single multidisciplinary follow up and maintenance protocol.

3.
Int J Womens Health ; 12: 107-113, 2020.
Artículo en Inglés | MEDLINE | ID: mdl-32184674

RESUMEN

Purpose: For thousands of years, fertility control has been used in different forms. This study was carried out to evaluate the knowledge and practice of participants regarding birth control methods with the prevalence of each method. Patients and Methods: A cross-sectional study design was employed to evaluate knowledge and practice among females. Three family-planning centers were included in addition to 2 general hospitals. A total of 440 married women between the ages of 18 and 40 years were interviewed by the first author. Self-administered version of a previously translated questionnaire was used to evaluate practice and knowledge concerning contraception use. Results: A total sample of 388 women of child-bearing age was interviewed. The mean age ± SD was 29.76 ± 6.67, while the mean number of their offspring was 4.06 ± 2.08. The intrauterine contraceptive device was the most frequently used method followed by oral contraceptive pills, while the safe-period method was the least frequently used. More than 50% of the females obtained their contraceptives from public health centers and/or hospitals. The mean number of contraception methods known by the females was 2.15 ± 1.07. Safety was the most indicated criterion for choosing the preferred method. Out of all the respondents, 86.9% indicated that they experience adverse effects from using contraceptive methods, in which a higher rate was for oral pills (31.1%), intrauterine contraceptive device (21.3%), or from both methods (18.4%). Conclusion: This study disclosed an acceptable level of knowledge and positive practices among Iraqi women seeking health-care facilities with respect to birth control methods. Females with lower levels of education require continued education and regular communication about the importance of birth control to promote the use of modern contraceptive methods. The findings from this study will help to develop programs that can improve knowledge of females and services provided by the health-care system and can reduce adverse effects from contraception and the incidence of unplanned pregnancies.

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