Purpose The purpose of this study is to systematically map all the factors that influence the fit and adaptation of zirconia crowns and/or copings. Materials and methods The investigational strategy involved carrying out an electronic search between December 1, 2009 and September 1, 2019 through the Embase and Medline databases using Boolean operators to locate appropriate articles. Results A total of 637 articles were discovered after the removal of duplicates, and 46 of these were selected for evaluation. Further, a quality assessment was performed using GRADE evaluation criteria. Conclusions Shoulder finish line preparations had slightly better marginal fit compared to chamfer finish lines. Crowns obtained from digital impressions had comparable to superior marginal adaptation compared to conventional impressions. Increasing cement space showed to improve zirconia crown adaptation. Cementation and veneering zirconia frameworks found to increase the marginal and internal gaps. Limited information is available on the effect of the alteration of sintering time/Temperature and/or sintering techniques on the adaptation of zirconia crowns. Most of the selected studies had a moderate quality assessment evaluation. Future studies could investigate the chair‐side, ultra‐fast sintering effect on the marginal gap of zirconia crowns.

Objectives We tested hypotheses regarding how adolescent oral health‐related behaviors are associated with socioeconomic status (SES) and family and peer social support, including the extent to which such associations differ for boys and girls. Methods We analyzed data from the 2013/2014 Canadian Health Behavior in School‐aged Children Study for 20,357 adolescents ages 12–18 years. Family Affluence Scale was used to assess SES. Family and peer social support were assessed using the Multidimensional Scale of Perceived Social Support. We estimated average marginal effects from multivariable binary logistic regression models for three oral health‐risk behaviors outcomes: infrequent toothbrushing, high sugar‐sweetened beverage (SSB) intake, and high sweets consumption across both genders. Results Adolescents from low SES households had lower probability of parental and peer support, and were significantly more likely to report infrequent toothbrushing and high SSB consumption, both before and after controlling for both types of support. Lower family support was associated with higher probability of engaging in infrequent toothbrushing and high SSB intake, while lower peer support was associated with higher probability of engaging in infrequent toothbrushing and lower likelihood of engaging in high SSB consumption. The associations of family support with oral health‐related behaviors were somewhat stronger for boys than girls. Conclusions Low SES and low family support were associated with a higher likelihood of oral health‐risk behaviors (infrequent toothbrushing and SSB consumption). Regardless of adolescents' gender, parental support exerted a protective role, but peer support had countervailing risk and protective roles on oral health‐related behaviors.

Objectives We tested hypotheses regarding socioeconomic status (SES) disparities in oral health amongst children and adolescents and the extent to which such SES disparities may be mediated by parenting stress. Methods We analysed data from the 2011/2012 US National Survey of Children's Health for ages 6‐11 years (n = 21 596) and 12‐17 years (n = 23 584). Our models estimated associations between SES indicators (family income and parental education) and parenting stress with two oral health outcomes: parent‐reported child oral health and preventive dental visits. Results For both age groups, SES was positively associated with both oral health outcomes. Parenting stress mediated the relationship between SES and child oral health, not preventive dental visits—such that lower SES was associated with worse oral health via higher parenting stress. Amongst children, the indirect effect of parenting stress was observed for parental education and family income, whilst amongst adolescents, no indirect effect of parenting stress was observed. Conclusion Parenting stress was an important determinant of children's oral health and partially explained the SES‐related oral health disparities in children. Future research is needed to explore the causal pathways in this association.