Estimation of simultaneous equation models by backpropagation method using stochastic gradient descent.

Simultaneous equation model (SEM) is an econometric technique traditionally used in economics but with many applications in other sciences. This model allows the bidirectional relationship between variables and a simultaneous relationship between the equation set. There are many estimators used for solving an SEM.

Validation of the "Quality of Life related to function, aesthetics, socialization, and thoughts about health-behavioural habits (QoLFAST-10)" scale for wearers of implant-supported fixed partial dentures.

Objectives: To validate the 'Quality of Life related to function, aesthetics, socialization, and thoughts about health-behavioural habits (QoLFAST-10)' questionnaire for assessing the whole concept of oral health-related quality of life (OHRQoL) of implant-supported fixed partial denture (FPD) wearers.

Methods: 107 patients were assigned to: Group 1 (HP; n=37): fixed-detachable hybrid prostheses (control); Group 2 (C-PD, n=35): cemented partial dentures; and Group 3 (S-PD, n=35): screwed partial dentures. Patients answered the QoLFAST-10 and the Oral Health Impact Profile (OHIP-14sp) scales.

Validation of a new, specific, complete, and short OHRQoL scale (QoLFAST-10) for wearers of implant overdentures and fixed-detachable hybrid prostheses.

Objectives: To validate a new index for assessing the whole concept of oral health-related quality of life (OHRQoL) of implant-prosthesis wearers.

Methods: 113 patients who were not requesting dental treatment were assigned to: Group 1 (CD; n=38): complete denture users (control); Group 2 (IO; n=38): implant overdenture wearers; and Group 3 (HP; n=37): hybrid implant prosthesis users. Patients answered the newly-designed 'Quality of Life related to Function, Aesthetics, Socialization, and Thoughts about health-behavioural habits' (QoLFAST-10) and the Oral Health Impact Profile (OHIP-20sp) questionnaires.

Oral aesthetic-related quality of life of muco-supported prosthesis and implant-retained overdenture wearers assessed by a new, short, specific scale (QoLDAS-9).

Objectives: To validate a new questionnaire for evaluating the 'Oral aesthetic-related quality of life (OARQoL)' of prosthetically restored patients. 'OARQoL' assesses the impact of the self-perceived dental aesthetics on patients' well-being.

Methods: The 'Quality of Life associated with Dental Aesthetic Satisfaction (QoLDAS)' index was designed.

Validation of the 'Quality of Life with Implant Prostheses (QoLIP-10)' questionnaire for wearers of cement-retained implant-supported restorations.

Objectives: To validate the 'Quality of Life with Implant-Prostheses (QoLIP-10)' questionnaire for assessing the impact of cemented implant prostheses on Oral Health-Related Quality of Life (OHRQoL).

Methods: 84 subjects wearing implant restorations were distributed as follows: Group 1 (SD-I; n=35): screwed FDPs (fixed dental prostheses) supported by 2 implants; Group 2 (SD-II; n=7): screwed FDPs supported by 3-5 implants; Group 3 (CD-I; n=36): cemented FDPs supported by 2 implants; and Group 4 (CD-II; n=6): cemented FDPs supported by 3-5 implants. The QoLIP-10 and the Oral Health Impact Profile (OHIP-14sp) scales were used.

Oral health-related quality of life in complete denture wearers depending on their socio-demographic background, prosthetic-related factors and clinical condition.

Objectives: To investigate the differences in impact on oral health-related quality of life (OHRQoL) among complete denture wearers depending on their socio-demographic characteristics, prosthetic-related factors and oral status.

Study Design: 51 patients aged 50-90 years treated, from 2005 to 2010, with at least one complete denture at the Department of Buccofacial Prostheses of the Complutense University (Madrid) were enrolled in this cross-sectional study. All of the participants answered the Oral Health Impact Profile (OHIP-14sp) questionnaire.