The Effect of Clenching and Occlusal Instability on Body Weight Distribution, Assessed by a Postural Platform.

The purpose of this research project was to investigate whether or not clenching and occlusal instability of Angle's Class I malocclusion have an effect on body weight distribution in healthy adult subjects. Twenty adults (fourteen males and six females, ages 27-40, mean age 31.7 years, SD 3.

The effect of different implant-abutment connections on screw joint stability.

Dental implants with an internal connection have been designed to establish a better stress distribution when lateral external forces act on the prosthesis and minimize the forces transmitted to the fastening screw. In the present study, 10 externally and 10 internally hexed implants were tested with a compressive force applied with an Instron Universal machine. Four cycles of loading-unloading were applied to each specimen to achieve displacements of 0.

Marginal adaptation of four inlay casting waxes on stone, titanium, and zirconia dies.

Statement Of Problem: Different inlay casting waxes do not produce copings with satisfactory marginal accuracy when used on different die materials.

Purpose: The purpose of this study was to evaluate the marginal accuracy of 4 inlay casting waxes on stone dies and titanium and zirconia abutments and to correlate the findings with the degree of wetting between the die specimens and the inlay casting waxes.

Material And Methods: The inlay casting waxes tested were Starwax (Dentaurum), Unterziehwachs (Bredent), SU Esthetic wax (Schuler), and Sculpturing wax (Renfert).

Immediate provisionalization and nonfunctional loading of a single implant in the maxillary esthetic zone: a clinical presentation and parameters for consideration.

Restoration of single tooth loss with implant supported prosthesis is now considered a highly predictable treatment. However, the maxillary anterior region still presents a challenge for both the prosthodontist and the periodontist because of the inherent difficulties encountered in the provisionalization and harmonic incorporation of the definitive prosthesis into patient's dentogingival complex. This paper presents a clinical case of a single implant placed immediately after the extraction of a maxillary central incisor, followed by immediate provisionalization and nonfunctional loading.

Biomechanical considerations on tooth-implant supported fixed partial dentures.

This article discusses the connection of teeth to implants, in order to restore partial edentulism. The main problem arising from this connection is tooth intrusion, which can occur in up to 7.3% of the cases.

Delayed linear dimensional changes of five high strength gypsum products used for the fabrication of definitive casts.

Statement Of Problem: Prolonged storage of definitive casts made from Type IV and Type V gypsum products, especially in an environment of increased temperature and low humidity, may result in contraction.

Purpose: The purpose of this study was to evaluate the linear dimensional changes of 5 different high strength stones after exposing them to 2 different storage conditions over a period of 3 weeks.

Material And Methods: Three Type IV dental stones (Fujirock, Vel-Mix, Suprastone) and 2 Type V dental stones (Hard Rock, Jade Stone) were tested in this study.

Immediately loaded maxillary and mandibular dental implants with fixed CAD/CAM prostheses using a flapless surgical approach: a clinical report.

Immediate implant loading is a viable treatment method for selected cases. One of the greatest advantages of this method is the virtual surgery, which precedes the actual clinical treatment and eliminates any need for last minute decisions. The actual surgery time is decreased, since all steps are predetermined.

Simplifying prosthetic procedures while converting an interim maxillary removable complete denture to an interim implant-supported fixed complete denture.

This article describes a method of converting an interim maxillary removable complete denture to an interim implant-supported fixed complete denture. The advantages of this method are that it provides the opportunity to evaluate the patient's function and esthetics, and helps the accurate transfer of the maxillomandibular relationship to the laboratory. Consequently, the fabrication of the definitive prostheses is accurate, and the final result is predictable.

Delayed setting and hygroscopic linear expansion of three gypsum products used for cast articulation.

Statement Of Problem: Wetting of the set gypsum product used for cast articulation may result in additional expansion.

Purpose: The purpose of this study was to evaluate the linear expansion of 2 type II and 1 type III gypsum products with and without addition of water after setting, over a time period of 120 hours.

Material And Methods: The gypsum products tested in this study were Model Plaster, Lab Plaster, and Mounting Stone.

Fracture resistance of metal ceramic restorations with two different margin designs after exposure to masticatory simulation.

Statement Of Problem: Although the esthetic outcome of a collarless metal ceramic restoration is superior to that of a restoration with a metal margin, its mechanical strength has not been evaluated.

Purpose: The purpose of this study was to evaluate and compare the fracture resistance of metal ceramic restorations with metal margins to that of metal ceramic restorations with circumferential porcelain margins, after exposure to masticatory simulation.

Material And Methods: Twenty-four metal ceramic restorations were fabricated and paired with 24 cobalt-chrome tooth analogs.

The in vitro effect of different implant angulations and cyclic dislodgement on the retentive properties of an overdenture attachment system.

Statement Of Problem: The retentive capacity of ball attachments may be altered by a change in implant angulations.

Purpose: The purpose of this in vitro study was to investigate the effect of cyclic dislodgement on the retention of an overdenture attachment system when 2 implants were placed at angulations of 0, 5, 10, 15, and 20 degrees.

Material And Methods: Twelve acrylic resin blocks were fabricated and divided into 6 groups of 2 pairs each.

Impact of interproximal groove placement and remaining coronal tooth structure on the fracture resistance of endodontically treated maxillary anterior teeth.

Purpose: This in vitro study investigated the effect of grooves, remaining tooth structure, and their combination on tooth fracture resistance of endodontically treated anterior teeth with cast dowel and cores.

Materials And Methods: Sixty extracted maxillary anterior teeth of similar dimensions were endodontically treated and then randomly divided into three groups of 20 teeth each. The teeth in the first group were cut horizontally at the widest part of their anatomical crowns.

The effect of different investment techniques on the surface roughness and irregularities of gold palladium alloy castings.

Statement Of Problem: Surface roughness and irregularities can affect the fit of a restoration. It is unknown whether different investment techniques have an effect on surface roughness and irregularities of gold palladium alloy castings.

Purpose: The purpose of this study was to evaluate the surface roughness and irregularities of gold palladium alloy castings obtained using different investment techniques.

Effect of relining method on dimensional accuracy of posterior palatal seal. An in vitro study.

Purpose: The posterior palatal seal contributes to the retention of the complete denture. Distortion of this area can occur during reline procedures. The purpose of this study was to evaluate the dimensional accuracy of various denture relining methods and materials on the maxillary posterior palatal seal area.

Pre- and post-set hydrophilicity of elastomeric impression materials.

Purpose: To evaluate the hydrophilicity of one polyether, four poly(vinyl siloxanes), and one condensation silicone before and after setting under simulated clinical conditions, and to correlate the findings to the contact angle values of these materials.

Materials And Methods: The hydrophilicity before and after setting, as well as the contact angle values of the elastomeric impression materials were evaluated. Part I: A freshly extracted tooth, which was prepared for a full coverage restoration, was kept in saliva for 15 minutes and was then rinsed for 10 seconds.

Fixed rehabilitation of an ACP PDI class III patient.

This clinical report documents the treatment of a 63-year-old Caucasian female Prosthodontic Diagnostic Index Class III patient using dental implants and a fixed prosthetic reconstruction. The treatment involved the fabrication of single crowns and fixed partial dentures retained by natural teeth in the maxillary arch. The posterior segments of the mandibular arch were rehabilitated with fixed partial dentures retained by endosseous implants.

Optical behavior of current ceramic systems.

The restoration of anterior teeth is a difficult task, even for an experienced operator. Currently there are many different ceramic systems that can be used to achieve highly esthetic results. These include metal-ceramics with porcelain margins, Dicor, In-Ceram, Cerestore, Hi-Ceram, IPS-Empress, Cerapearl, Optec, and CAD/CAM ceramics.

A simple impression technique for dental implants placed in close proximity or adverse angulations.

This article presents a method for overcoming difficulties associated with the impression procedures for implants placed in close proximity or with adverse angulations, which make the placement of the impression copings problematic.

An experimental study on particular physical properties of several interocclusal recording media. Part III: resistance to compression after setting.

Purpose: The purpose of this study was to evaluate the resistance to compression after setting of several elastomeric interocclusal recording materials.

Materials And Methods: Testing of the resistance to compression after setting was performed following a modification of the method described in specification No. 19 (4.

Light transmission of posts and cores used for the anterior esthetic region.

Restoration of endodontically treated teeth is a routine procedure in everyday clinical practice. Placement of posts and cores is often required for replacement of the missing coronal aspect of teeth. Use of traditional post-and-core systems (gold and titanium) in conjunction with all-ceramic restorations results in poor esthetics because of the reflection and lack of light transmission.

An experimental study on particular physical properties of several interocclusal recording media. Part II: Linear dimensional change and accompanying weight change.

Purpose: The purpose of this study was to evaluate the linear dimensional change and accompanying weight change of several elastomeric interocclusal recording media.

Materials And Methods: Ten 50 mm long, 8 mm wide, 3 mm deep Teflon molds and a stainless steel die were constructed for the purposes of this study. The die was made in order to produce standardized reference lines, which were used for the measurement of the linear change.

An experimental study on particular physical properties of several interocclusal recording media. Part I: consistency prior to setting.

Purpose: To evaluate the consistency prior to the setting of 5 elastomeric interocclusal recording materials in comparison with a wax and a zinc oxide-eugenol paste. This property is related to the viscosity as well as to the working and setting times of these materials.

Materials And Methods: Testing of consistency was performed following a modification of the method described in ADA Specification No.

Cement-retained versus screw-retained implant restorations: a critical review.

This article presents a comparison of screw-retained and cement-retained implant prostheses based on the literature. The advantages, disadvantages, and limitations of the 2 different types of restorations are discussed, because it is important to understand the influence of the attachment mechanism on many clinical aspects of implant dentistry. Several factors essential to the long-term success of any implant prosthesis were reviewed with regard to both methods of fixation.