Exploring the potential of machine learning models to predict nasal measurements through facial landmarks.

Statement Of Problem: Information on predicting the measurements of the nose from selected facial landmarks to assist in maxillofacial prosthodontics is lacking.

Purpose: The objective of this study was to identify the efficiency of machine learning models in predicting the length and width of the nose from selected facial landmarks.

Material And Methods: Two-dimensional frontal and lateral photographs were made of 100 men and 100 women.

The level of evidence in prosthodontics in relation to author's characteristics: An analysis of three leading prosthodontics journals.

Purpose: The purpose of this study was to examine the level of evidence (LOE) characteristics and associated factors that change over time in three leading prosthodontics journals.

Materials And Methods: Articles published in The Journal of Prosthetic Dentistry (JPD), International Journal of Prosthodontics (IJP), and Journal of Prosthodontics (JP) in 2013 and 2020 were reviewed by eight independent reviewers. After applying exclusion and inclusion criteria, the number of authors, the corresponding author's educational degree, corresponding author's origin in each clinical research article were recorded.

Automated facial landmark measurement using machine learning: A feasibility study.

Statement Of Problem: Information regarding facial landmark measurement using machine learning (ML) techniques in prosthodontics is lacking.

Purpose: The objective of this study was to evaluate and compare the reliability, validity, and accuracy of facial anthropological measurements using both manual and ML landmark detection techniques.

Material And Methods: Two-dimensional (2D) frontal full-face photographs of 50 men and 50 women were made.

Machine learning model to predict the width of maxillary central incisor from anthropological measurements.

Purpose: To improve smile esthetics, clinicians should comprehensively analyze the face and ensure that the sizes selected for the maxillary anterior teeth are compatible with the available anthropological measurements. The inter commissural (ICW), interalar (IAW), intermedial-canthus (MCW), interlateral-canthus (LCW), and interpupillary (IPW) widths are used to determine the width of maxillary central incisors (CW). The aim of this study was to develop an automated approach using machine learning (ML) algorithms to predict central incisor width in a young Turkish population using anthropological measurements.

Influence of ceramic thickness, background and cement shade on the translucency of zirconia reinforced lithium silicate and lithium disilicate ceramics.

Background: Although, the influence of cement and background shade on the final color and translucency of zirconia reinforced lithium silicate (ZLS) and lithium disilicate (LDS) ceramics has been previously investigated, there is still little data on the translucency of LDS and ZLS ceramics in decreased thickness (0.4 and 0.6 mm).

Comparison of 3D accuracy of three different digital intraoral scanners in full-arch implant impressions.

Purpose: This study aimed to evaluate the performance of digital intraoral scanners in a completely edentulous patient with angled and parallel implants.

Materials And Methods: A total of 6 implants were placed at angulations of 0°, 5°, 0°, 0°, 15°, and 0° in regions #36, #34, #32, #42, #44, and #46, respectively, in a completely edentulous mandibular polyurethane model. Then, the study model created by connecting a scan body on the implants was scanned using a model scanner, and a 3D reference model was obtained.

Evaluation of the relationship between the geriatric anxiety and COVID-19 anxiety and fear levels in geriatric dental patients during the COVID-19 pandemic.

Background: Illness, social isolation and loneliness may cause different psychological problems in the geriatric population, including depression and anxiety. Factors such as anxiety and fear can negatively affect dental treatment processes and prognoses. Thus, in terms of dental approach to geriatric individuals, it is important to be aware of the emotional processes the elderly may have experienced during the pandemic.

Level of evidence and characteristics of clinical studies published in leading prosthodontics journals.

Statement Of Problem: Data on the level of evidence and the characteristics of studies published in peer-reviewed prosthodontic journals are lacking.

Purpose: The purpose of this study was to investigate the characteristics and level of evidence (LOE) scores of studies published in 3 leading peer-reviewed prosthodontic journals.

Material And Methods: Clinical studies published in the Journal of Prosthetic Dentistry (JPD), the Journal of Prosthodontics (JP), and the International Journal of Prosthodontics (IJP) in 2013 and 2020 were included in the analysis.

Effect of variations in facial flow curves on the perceptions of smile esthetics by laypeople.

Statement Of Problem: Information about the effect of the facial flow concept on the smile esthetic perception of laypeople is lacking.

Purpose: The purpose of this study was to determine the effect of the facial flow concept on laypeople's perception of smile esthetics.

Material And Methods: Frontal full-face images of a female volunteer were digitally altered to create commissural line and transverse occlusal plane inclinations, a dental midline shift, and facial asymmetries.

Effect of coating on the color and surface hardness of the surface of dental ceramics.

Background: The aim of this study was to investigate whether boron nitride (BN) and BN-chromium (BN-Cr) coatings applied with the sputtering method would change the characteristics of hardness and discoloration of the ceramic veneer surface.

Materials And Methods: In this experimental study, thirty disc-shaped cores (10 mm in diameter and 0.8 mm in thickness) were prepared.

Evaluation of the color stability of temporary materials produced with CAD/CAM.

Background: If a temporary restoration is in the esthetic area and needs to be worn for a long time, the color stability of temporary materials becomes an important factor.

Objectives: The aim of this in vitro study was to evaluate the long-term effects of various staining solutions on the color stability of different temporary materials produced with the computer-aided design and computer-aided manufacturing (CAD/CAM) technology.

Material And Methods: In the study, the following materials were used: VITA CAD-Temp® (group 1); Ceramill® Temp (group 2); and Telio® CAD (group 3).

Effect of fiber reinforcement on color stability of composite resins.

Aim: The aim of this study was to determine the effect of fiber reinforcement on the color changes of two different composite resins.

Materials And Methods: A silorane-based composite (Filtek Silorane, A2 shade) and a methacrylate-based composite (Valux Plus, A2 shade) were used in this study. Three groups of samples (control group with no reinforcements, polyethylene fiber [Ribbond THM]-reinforced composite, and glass fiber [everStick Net]-reinforced composite groups) were prepared from each composite ( = 8).

Three-Dimensional Accuracy of Conventional Versus Digital Complete Arch Implant Impressions.

Purpose: The accuracy of digital impressions is still controversial for complete arch implant cases. The aim of this study is to compare the accuracy of different intraoral scanners with the conventional technique in terms of trueness and precision in a complete arch implant model.

Material And Methods: Eight implants were inserted asymmetrically in a polyurethane edentulous mandibular model with different angulations.

Effects of gingival margin asymmetries on the smile esthetic perception of dental professionals and lay people.

Objective: To determine the effects of different gingival margin asymmetries of anterior tooth on the smile esthetic perceptions of dentists, prosthodontists, periodontists and lay people.

Materials And Methods: A frontal close-up smile photo of a woman was used in this study. Image was digitally altered in order to create gingival margin asymmetries in left maxillary central, lateral incisors, and canines.

A comparison of the fracture resistance of premolars without a ferrule with different post systems.

Statement Of Problem: Which type of post improves the performance of endodontically treated mandibular premolars without a ferrule remains unclear.

Purpose: The purpose of this in vitro study was to compare the restoration of endodontically treated mandibular premolars without a ferrule by using different post systems.

Material And Methods: Thirty extracted mandibular premolars were endodontically treated, and their crowns removed.

The effect of restoration thickness and resin cement shade on the color and translucency of a high-translucency monolithic zirconia.

Statement Of Problem: Information regarding the influence of cements and material thickness on the final color of monolithic zirconia restorations is lacking.

Purpose: The purpose of this in vitro study was to examine the effect of varying resin cement colors and material thicknesses on the color and translucency of a high-translucency monolithic zirconia and to compare these effects with those reported in similar studies that examined other dental zirconia materials.

Material And Methods: Katana High Translucent (Kuraray) was used as a monolithic zirconia material.

An investigation of the esthetic indicators of maxillary anterior teeth in young Turkish people.

Statement Of Problem: Comprehensive studies evaluating the dimensions of anterior maxillary teeth in the Turkish population with respect to different esthetic parameters are lacking.

Purpose: The purpose of this clinical study was to evaluate different proportions of teeth and compare them with current esthetic parameters such as the golden proportion, recurring esthetic dental proportion, and width-to-height ratio of central incisors and to evaluate whether the apparent contact dimension of maxillary anterior teeth follows the "50:40:30" rule.

Material And Methods: A total of 150 Turkish dental students (81 men and 69 women) aged between 18 and 24 years participated in the study.

Effect of number of firings on the color and translucency of ceramic core materials with veneer ceramic of different thicknesses.

Statement Of Problem: Whether masking or translucency should be the goal for achieving an esthetic restoration with ceramic materials is unknown.

Purpose: The purpose of this in vitro study was to examine the effect of the number of firings on the color and translucency of ceramic core material with different thicknesses of veneer ceramic.

Material And Methods: Three different ceramic systems were used: IPS Empress (IE), IPS e.

Color changes in resin cement polymerized with different curing lights under indirect restorations.

Aim: The aim of the study was to investigate the effects of different interface materials and curing units on color changes in a resin cement material.

Materials And Methods: Three interface materials and different curing systems, quartz-tungsten-halogen and polywave and monowave light-emitting diode (LED) light curing units, were studied at two-time intervals. Polystyrene strip was used as a control group.

Effect of repair resin type and surface treatment on the repair strength of polyamide denture base resin.

The purpose of the present study was to evaluate the effects of different repair resins and surface treatments on the repair strength of a polyamide denture base material. Polyamide resin specimens were prepared and divided into nine groups according to the surface treatments and repair materials. The flexural strengths were measured with a 3-point bending test.

In vitro evaluation of long-term cytotoxic response of injection-molded polyamide and polymethyle metacrylate denture base materials on primary fibroblast cell culture.

Objective: This study investigated the long-term cytotoxic response of thermoplastic polyamide and conventional polymethyle metacrylate (PMMA) denture base materials.

Materials And Methods: Twenty discs were prepared for each polyamide, heat and cold cured PMMA denture base resins (totally 60) and divided into four sub-groups (n = 5). Cytotoxicity was assessed with the direct cell contact method using cell viability and neutral red (NR) uptake assay.

Effect of water storage and additional polymerization on the color parameters of flowable resin composites.

Aims: Tooth colored dental restorative materials should maintain their chromatic properties throughout their service period. The aim of this study was to examine the possible color changes of flowable resin composite filling materials following water storage. The effect of additional light curing on color stability of restorative materials was also investigated.

Incisal translucency of vital natural unrestored teeth: a clinical study.

Introduction: Understanding the distribution of incisal translucency will provide clinicians a guide to use this knowledge to improve the esthetic replication of anterior restorations. The aim of this study is to investigate the distribution of incisal translucency of unrestored vital natural maxillary central, lateral, and canine vital teeth from a stratified population in different age, gender, and race.

Materials And Methods: A total of 120 subjects were recruited for this study.

The effect of staining solutions on the color stability of provisional prosthodontic materials.

Objectives: The aim of this study was to evaluate the effects of staining solutions on the color stability of self-cure provisional resin materials.

Methods: The specimens were prepared for each of three auto-polymerized bis-acryl resin and auto-polymerized methyl methacrylate provisional resin material. The baseline color values were measured with a colorimeter according to the CIE L(*)a(*)b(*) color scale.

The color differences of direct esthetic restorative materials after setting and compared with a shade guide.

Background: The authors conducted a study to evaluate esthetic restorative materials' color differences after setting and color matching between set materials and a shade guide.

Materials And Methods: The authors evaluated 13 resin-based composites, one silorane-based composite, two polyacid-modified resin composites and one conventional glass ionomer cement. They measured the color parameters of the samples, which were 8 millimeters in diameter and 1.