The impact of different surface treatments on repair bond strength of conventionally, subtractive-, and additive-manufactured denture bases.

Objective: This study aimed to examine the shear bond strength (SBS) of repair material to conventionally, subtractive-, and additive-manufactured denture bases after different surface treatments.

Materials And Methods: Disk-shaped test specimens (N = 300) were prepared from denture base materials produced by one conventional (Procryla), one subtractive (Yamahachi), and one additive (Curo Denture) method. The test specimens were randomly divided into five groups (n = 10) and exposed to a variety of surface treatments-Group A: no surface treatment; Group B: grinding with silicon carbide paper; Group C: sandblasting; Group D: erbium: yttrium-aluminum-garnet laser; and Group E: plasma.

The effect of various surface treatments on the repair bond strength of denture bases produced by digital and conventional methods.

There is limited information on the repairability of prostheses produced with digital technology. This study aims to evaluate various surface treatments on flexural bond strength of repaired dentured base resins produced by digital and conventional methods. A total of 360 samples were prepared from one heat-polymerized, one CAD/CAM milled and one 3D printed denture base materials.

In vitro evaluation of color replication of metal ceramic specimens using visual and instrumental color determinations.

Statement Of Problem: It remains unclear whether or not the performance of intraoral colorimetric devices is accurate.

Purpose: The purpose of this study was to evaluate the color replication of metal ceramics using an intraoral colorimeter and visual shade determination.

Material And Methods: Twenty-five metal ceramic specimens were prepared to match 5 different shades (A1, B1, C3, D3, A3.

In vivo and in vitro assessment of an intraoral dental colorimeter.

Purpose: The purpose of this study was to assess the performance of an intraoral dental colorimeter.

Materials And Methods: In vivo repeatability of an intraoral colorimeter was assessed by performing color measurements of 30 individuals' right maxillary central incisor. Three consecutive measurements from each individual were made.

Influence of cement shade and water storage on the final color of leucite-reinforced ceramics.

Leucite-reinforced ceramics have a translucent structure, which may have an advantage when fabricating esthetic restorations. However, the different shades of cement and water storage may adversely affect the final color of translucent restorations. Over time, the final color of a restoration may be significantly affected by the shade of the cement.

Comparison of visual shade determination and an intra-oral dental colourimeter.

The choice of correct tooth shade for the fabrication of a restoration remains a challenge, even for experienced clinicians. The aim of this research was to evaluate and compare the precision of two different shade determination methods in terms of repeatability. Maxillary right central incisor of 10 patients was evaluated visually with the use of Vitapan Classical shade guide by five observers and instrumentally with the Vitapan classical shade guide values of ShadeEye NCC intra-oral colourimeter three times consecutively.

The adherence of Candida albicans to acrylic resin reinforced with different fibers.

One important aethiological factor in the pathogenesis of chronic atrophic candidosis is the presence of Candida albicans on the fitting surface of the dentures. Fibers may come into contact with oral mucosa during the finishing procedures of acrylic resins. The exposed fibers may provide mechanical retention for yeast cells at the interface of the components.

A prosthetic treatment approach for a cherubism patient: A clinical report.

Cherubism is an early childhood disease that primarily involves the mandible and consists of painless mandibular enlargement with or without maxillary involvement and progresses rapidly over the course of several years. This clinical report describes the fabrication of maxillary fixed partial dentures and a mandibular overdenture for a 21-year-old man with cherubism.

Comparison of the electromyographic activity of individuals with canine guidance and group function occlusion.

The purpose of this study was to investigate occlusal schemes (canine guidance and group function) in relation to masticatory muscle activity. It was performed on 30 subjects, 15 with canine guidance and 15 with group function. Bilateral electromyographic recordings of masseter and anterior temporal muscles were obtained by surface electrodes during gum chewing and sliding laterally from centric relation while the teeth were in contact.

Changes in mandibular ridge height in relation to aging and length of edentulism period.

This study investigated the mandibular height reduction in relationship to aging and the length of edentulism period. Data were collected from 120 edentulous male subjects (complete denture wearers) who were divided into two resorptive age groups. The edentulism period of the subjects was classified as 1 to 5, 5 to 10, and over 10 years.

Microleakage of indirect inlays placed on different kinds of glass ionomer cement linings.

The objective of this study is to compare the marginal seal of Class II cavities restored with indirect inlays constructed on glass ionomer cement linings having different curing properties. Also the effect of acid-etching of these liners on microleakage was investigated. Mesio-occlusal and disto-occlusal cavities in 80 extracted human molars having the cervical floor below the cementoenamel junction were prepared (n:160).

Influence of porcelain material and composite luting resin on microleakage of porcelain laminate veneers.

The microleakage beneath porcelain laminate veneers was investigated. The restoration margins were located according to the preparations made below or above CEJ of extracted maxillary central incisors. Vitadur N and Microbond porcelain materials were used to prepare laminate veneers.

Microleakage in porcelain laminate veneers.

The effectiveness of two dentine-enamel bonding agents has been investigated in vitro when used together with an unfilled, low viscosity resin in eliminating the microleakage of porcelain laminate veneers. The restoration margins were located below and above the amelocemental junction of extracted maxillary central incisors. The bonded specimens were thermocycled and investigated for microleakage by employing a standard dye penetration technique.

Evaluation of the level of residual monomer in acrylic denture base materials having different polymerization properties.

The aim of this study was to evaluate the level of residual monomer in acrylic denture base materials having different polymerization properties. The investigation included a conventional-type acrylic cured under heat and pressure, as well as a pour-type resin polymerized by an injection-moulding technique at room temperature and under pressure. It was found that the residual monomer content ranged from 0.

[Effects of various prosthodontic strengtheners on fatigue behaviour of acrylic resins].

The fatigue behaviour of acrylic sheet specimens containing reinforcers were investigated. Three different kinds of reinforcers namely, stainless steel, aluminum reinforcer and three flex wire were used as strengtheners in acrylic resin sheets. The tests were carried out on alternating bending fatigue testing machine specially designed to test sheet specimens.

[Effects of various enzymes on Candida albicans activity on denture base materials].

In this study, the effects of various enzymes to remove C. Albicans, contamined on to the different kinds of specimens prepared from 5 different denture base materials were investigated. All kinds of enzymes investigated were found to be effective, but both protase and the pure lipase were observed to be more effective than the others by their zero colonies calculated.