Prosthetic complications with mandibular bar-retained implant overdentures having distal attachments and metal frameworks: A 2- to 12-year retrospective analysis.

Statement Of Problem: Long-term reports on 2-implant-retained overdentures having metal frameworks and bars containing distal attachments are scarce.

Purpose: The purpose of this retrospective study was to evaluate prosthetic complications with 2-implant-retained mandibular overdentures with metal frameworks having either screw- or cement-retained cantilevered bars with distal attachments.

Material And Methods: Seventy-three edentulous study participants who had been treated with mandibular overdentures with 2 implants were included.

Marginal fit of 3-unit CAD-CAM zirconia frameworks fabricated using cone beam computed tomography scans: an experimental study.

Whether cone beam computed tomography (CBCT) scans can be used for the fabrication of computer-aided design and computer-aided manufacturing (CAD-CAM) fixed dental prostheses (FDPs) is not known. The purpose of the present study was to compare the marginal fit of 3-unit zirconia FDPs fabricated by using CBCT or 3-dimensional (3D) laboratory scanning. Extracted second premolar and molar teeth in a maxillary typodont model were prepared.

Marginal fit of CAD-CAM monolithic zirconia crowns fabricated by using cone beam computed tomography scans.

Statement Of Problem: Information regarding the precision of monolithic zirconia crowns fabricated by using a standard computer-aided design and computer-aided manufacturing (CAD-CAM) workflow is available. However, information on the effect of a modified workflow using 3D laboratory scanning and/or cone beam computed tomography (CBCT) for monolithic zirconia crown fabrication is lacking.

Purpose: The purpose of this in vitro study was to evaluate the effect of different scans on the marginal fit of CAD-CAM monolithic zirconia crowns fabricated by 3D laboratory scanning and CBCT.

Marginal Adaptation of Provisional CAD/CAM Restorations Fabricated Using Various Simulated Digital Cement Space Settings.

Purpose: The ideal digital cement space value for the fabrication of provisional computer-aided design/computer-aided manufacturing (CAD/CAM) crowns with clinically acceptable marginal adaptation is not well known. The aim of this study was to evaluate the effect of different simulated cement space settings on the marginal fit of poly(methyl methacrylate) (PMMA) provisional CAD/CAM restorations.

Materials And Methods: An extracted premolar tooth was prepared using ceramic crown preparation guidelines and represented both natural teeth and/or custom implant abutments.

Effect of fabrication stages and cementation on the marginal fit of CAD-CAM monolithic zirconia crowns.

Statement Of Problem: Monolithic zirconia crowns fabricated using computer-aided design and computer-aided manufacturing (CAD-CAM) technology have recently become an alternative dental prosthetic treatment. The marginal fit of monolithic zirconia crown may be affected by different stages of the fabrication procedures in the laboratory and cementation. Information regarding the accuracy of fit of monolithic zirconia crowns at different stages of fabrication and cementation is limited.

Effect of cement space on the marginal fit of CAD-CAM-fabricated monolithic zirconia crowns.

Statement Of Problem: Monolithic zirconia crowns fabricated with computer-aided design and computer-aided manufacturing (CAD-CAM) have recently become a common practice for the restoration of posterior teeth. The marginal fit of monolithic zirconia crowns may be affected by different cement space parameters set in the CAD software. Information is scarce regarding the effect of cement space on the marginal fit of monolithic zirconia crowns fabricated with CAD-CAM technology.

Evaluation of marginal fit of CAD/CAM restorations fabricated through cone beam computerized tomography and laboratory scanner data.

Statement Of Problem: Whether cone beam computed tomography (CBCT) images can be used for the fabrication of computer-aided design/computer-aided manufacturing (CAD/CAM) restorations is unknown.

Purpose: The purpose of this in vitro study was to evaluate the marginal fit of CAD/CAM restorations fabricated by using data from CBCT scans with 3 different voxels and laser scanner images.

Material And Methods: A crown preparation was made on an extracted premolar tooth according to ceramic crown preparation guidelines.

Using the "final-on-four" concept to deliver an immediate metal-resin implant-fixed complete dental prosthesis.

In traditional dental implant therapy, the time between implant placement and delivery of the definitive prosthesis can be long and uncomfortable for a patient wearing a conventional removable denture on an atrophied ridge. New clinical protocols, often with tilted implants, are being used to immediately restore mandibular implants with interim restorations, thus shortening the patient's return to function. However, these conversion type interim restorations do not decrease the time to definitive prosthetic rehabilitation.

Digital evaluation of the accuracy of impression techniques and materials in angulated implants.

Objectives: The aim of this study was to investigate the accuracy of 2 different impression techniques and 3 different impression materials in models simulating parallel and angulated implants.

Methods: Three master models simulating partial edentulous mandible with 2 implants at the sites of second premolars (parallel) and second molars with different angulations (parallel, 10° or 20° angulated) were fabricated. Two different impression techniques [splinted direct (D), indirect (I)] and 3 different monophase impression materials [polyether (PE), vinyl polysiloxane (VPS), vinyl polyether silicone (VPES)] were used for each master model and a total of 180 impressions were made (n=10).

Galvanic gold plating for fixed dental prosthesis.

Metal ceramic partial fixed dental prostheses have been commonly used for the replacement of missing teeth for many years. Because of an increase in the price of gold, base metal alloys have been the choice of alloy for the fabrication of metal ceramic restorations in many dental clinics. Some major disadvantages of base metals are their corrosion and the dark coloration they may cause at the crown margins.

A clinical comparison of cordless and conventional displacement systems regarding clinical performance and impression quality.

Statement Of Problem: It is not clear whether newly introduced cordless displacement systems are better able to manage gingiva than conventional systems.

Purpose: The purpose of this in vivo study was to evaluate the gingival management ability of 4 different displacement methods with a standardized subgingival preparation finish line.

Material And Methods: The effects of 4 displacement techniques on gingival management and impression quality were evaluated by means of 6 evaluation criteria.

An alternative impression technique for complete dentures.

This article describes a technique for creating adequate space for an even thickness of polyvinyl siloxane (PVS) impression material at the periphery during complete denture impression making. A PVS border molding material is injected around the borders of a custom tray, a 17-μm-thick stretch wrap film is folded into 4 layers, and a tray-shaped piece slightly larger than the size of the custom tray is placed on the tray covering the borders. After the border molding procedure is completed, the film is removed and the definitive impression completed with a medium-viscosity PVS impression material.

Depigmented skin and phantom color measurements for realistic prostheses.

Purpose: The purpose of this study was to test the hypothesis that regardless of human skin phototype, areas of depigmented skin, as seen in vitiligo, are optically indistinguishable among skin phototypes. The average of the depigmented skin measurements can be used to develop the base color of realistic prostheses.

Methods And Materials: Data was analyzed from 20 of 32 recruited vitiligo study participants.

Salvaging an angled implant abutment with damaged internal threads: a clinical report.

This clinical report describes a technique to fit an existing fixed detachable implant-supported prosthesis to a zygomatic implant abutment with stripped internal threads. The threads of the abutment were retapped and a wide diameter/wide head retaining screw was used to secure the existing prosthesis on the abutment. Care is needed in the retrieval of broken screws so as not to damage the internal threads of the implants, which might lead to irreversible complications.

Two-piece impression procedure for implant-retained orbital prostheses.

Obtaining an accurate impression of facial tissues with undercuts and extraoral implants has always been a challenge for both clinicians and patients. This report describes a three-step, two-piece technique that enables an accurate and comfortable impression of undercut tissues and extraoral implants in an orbital defect. An impression of the basal tissue surface of the defect area was made using a medium-body polyether impression material followed by an impression of the entire face of the patient made with a polyvinyl siloxane (PVS) impression material.

Effect of different prosthetic materials on radiation dose distribution in an orbital defect: a clinical report.

It is challenging to treat and irradiate empty cavities with external-beam radiation therapy (EBRT) because body contour irregularities can result in dose heterogeneities. The use of compensator materials to fill the empty cavities can provide a more homogeneous radiation dose distribution. The purposes of this clinical report are to describe the use of 3 different materials (elastomeric material, water-filled balloon, and acrylic resin) in an orbital defect and compare the dosimetric parameters and photon-electron dose distribution during EBRT.

Color change during the surface preparation stages of metal ceramic alloys.

Statement Of Problem: Even though metal ceramic restorations (MCRs) are widely used by clinicians, the influence of the metal on the color of overlaying porcelain is unknown.

Purpose: The purpose of this study was to analyze the color alterations of different types of metal ceramic alloys during several stages of metal surface preparation and to determine the effect of those changes on the resulting color of opaque porcelain (OP).

Material And Methods: Seven different types of alloys (3 base metal, 3 noble, and 1 high noble) were used to prepare disk-shaped specimens (1 mm × 10 mm, n=3), followed by OP application (0.

A functional open-tray impression technique for implant-retained overdenture prostheses.

Several implant impression techniques with different materials have been described in the literature. Generally, border molding, functional, and final impressions have been made with 3 different materials, which makes the procedure technique-sensitive and time-consuming. A combination of open-tray and functional impression techniques is described in this technical report.

Rehabilitation of a malocclusion with an onlay removable partial denture in a patient with ankylosing spondylitis: a case report.

This case report describes the prosthetic rehabilitation of a patient with ankylosing spondylitis who presented with a malocclusion due to the unfavorable reduction of a mandibular fracture following a traffic accident. The residual malocclusion was successfully corrected with a maxillary removable partial denture and a mandibular onlay removable partial denture.

Biomechanical evaluation of tooth- and implant-supported fixed dental prostheses with various nonrigid connector positions: a finite element analysis.

Purpose: In the tooth- and implant-supported fixed dental prosthesis (FDP), rigid and nonrigid connector (NRC) designs have been preferred by clinicians for many years. The aim of this study was to analyze the stress distribution on the connecting areas of the superstructure and supporting structure of the tooth- and implant-supported FDP designs under both static vertical and oblique occlusal loads.

Materials And Methods: Four 2D finite element analysis (FEA) models were prepared presuming that the first and second molars were missing, and that the implant (3.

Radiation dose distribution in the external auditory canal with different prosthetic materials: a clinical report.

Radiotherapy (RT) is an essential component of cancer treatment and aims to deliver higher doses at target volumes and lower doses to surrounding organs to achieve higher tumor control with fewer side effects. Significant dose heterogeneities can occur during treatment of irregular surfaces with electron beams, especially in head, neck, and breast tissue. The external ear and external auditory canal have irregular surfaces, which may cause dose heterogeneity, primarily resulting in excessive doses in the normal tissues lining and adjacent to the ear canal.

A modified plastic shell technique for cement-retained implant restorations.

The best possible fit of prosthetic components should be the aim of the clinician. The technical report presented here describes the use of a modified plastic shell technique for modeling a cement-retained single-implant restoration. This approach will help to prevent potential errors caused by the wax modeling technique.

A surgical guide for craniofacial implant placement for an implant-retained auricular prosthesis.

Craniofacial implants provide excellent stability and retention for auricular prosthetic rehabilitation. Accurate location of implants is important to achieve optimal prosthetic results. This article describes an alternative procedure for fabricating an acrylic resin surgical template for craniofacial implant placement with the assistance of a 6-inch contour duplication gauge.