A simplified acrylic resin cast technique.
A simple technique for construction of acrylic resin casts has been described. This procedure utilizes inexpensive and standard supplies found in a dental office.
Acrylic Resins↗
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The use of wax and self-curing acrylic resin in border molding.
A procedure for border molding of impression trays with border wax and cold-curing acrylic resin has been described. The use of modeling compound, the water bath, and the alcohol torch has been eliminated.
Acrylic Resins↗
An evaluation of the cure of acrylic resin by three methods.
An investigation was designed and carried out to compare methyl acrylic resin processed by three methods--boiling, in the heat platen press, and a 9 hour, 75 degrees C cure. The material was cured in certain thicknesses in the heat platen press and by boiling without porosity. All samples cured for 9 hours at 75 degrees C had no porosity. The value of the heat platen press as a time-saving device and its applications in a maxillofacial laboratory were discussed.
Acrylic Resins↗
Heat-released stress in acrylic dentures.
Dimensional changes in an acrylic resin denture blank that are sufficient to cause changes in fit on a gypsum cast occur primarily when the dentures are heated in water to a temperature of 90 degrees C or more. The poor correlation between observed fit and the intermolar distance change indicates that the dimensional change of dentures is much more complex than suggested previously and may be the product of factors that are not as yet fully understood. Enough heat to cause distortion of the denture can be produced during the process of grinding the denture. It should be recognized by the dentist, the dental assistant, and the dental laboratory technician that denture resins are sensitive to the techniques that are used in finishing. Overheating even small regions may allow localized dimensional changes that result in distortion of the denture.
Acrylic Resins↗
A technique for fabrication of polydimethylsiloxane-acrylic resin obturators.
A flexible silicone obturator is an alternative to the acrylic resin obturator. It can be useful for patients with severe trismus who cannot insert a large prosthesis, as the flexibility of the hollow silicone section allows easy placement and removal (Fig. 9). Other patients cannot tolerate an unyielding substance against sensitive nasal tissues. Silicone can provide the necessary comfort without compromising retention. Silicone obturator sections can often be modified when further surgery is needed and result in a savings of time and expense (Fig. 10). For patients who can be reevaluated only twice a year, several silicone obturator sections can be made initially. One can be used while another is being cleaned or duplicated.
Acrylic Resins↗
Iron discoloration of acrylic resin exposed to chlorhexidine or tannic acid: a model study.
A clinical model was introduced to study the ability of chlorhexidine, tannic acid, and iron to discolor dental plaque formed on acrylic resin surfaces. None of the agents caused discoloration when applied individually five times daily during a 5-day period. However, exposure of the dental plaque to either chlorhexidine or tannic acid before the iron applications produced marked staining. Possible mechanisms, among which denaturation appears to be significant, are discussed. The use of a strong oxidizing agent, peroxymonosulfate, completely bleached the established discolorations.
Acrylic Resins↗
Construction of accurate acrylic resin provisional restorations.
A technique has been described for making accurate fitting acrylic resin provisional restorations with attention to marginal adaptation and ease of fabrication.
Acrylic Resins↗
Amalgam cores with acrylic resin transitional crowns as a matrix.
A transitional acrylic resin crown can be used as a matrix for condensation of amalgam cores in anterior teeth. The technique, advantages, and indications are reviewed.
Acrylic Resins↗
Acrylic resin stents for marsupialization.
Marsupialization is a surgical technique that may be preferred to enucleation in treatment of benign cysts. The acrylic resin obturator maintains the surgical opening during healing and assures success of the surgery. Two basic techniques to construct a stable and retentive obturator prosthesis were described.
Acrylic Resins↗
Fabrication of treatment restorations using acrylic resin denture teeth.
A technique is disclosed for fabricating esthetic, long-term treatment restorations by using acrylic resin denture teeth facings. The advantages of this method for provisional restoration construction are reduced costs and predictable, satisfying results.
Acrylic Resins↗
Functional modification of acrylic resin monoplane occlusions.
Patients with acrylic-resin monoplane occlusions were recalled over a 6-month to 6-year period. The intention was to obtain casts of the dentures in order to study the anteroposterior wear pattern for classifiable variations from the original monoplane occlusion. The lateral component of the wear pattern was not examined during this study. The project revealed wear patterns that were classifiable in terms of the recognized prosthetic occlusal plane forms--namely, the Monson curve, a reverse curve, or a persistence of the original monoplane. Right and left aspects of the maxillary occlusal plane were examined as separate entities and lateral asymmetry was evident in most patients. No attempt was made to quantify the extent of wear as in the studies of Harrison.
Acrylic Resins↗
Reinforced heat-processed acrylic resin provisional restorations.
A technique has been described for the fabrication of strong, esthetic, and periodontally considerable provisional restorations. The technique involves cast nonprecious metal frameworks and heat-processed acrylic resin.
Acrylic Resins↗
Complete denture retention. Part II: Wettability studies on various acrylic resin denture base materials.
The objective of this study was to characterize in vitro selected acrylic resin denture base materials by water-contact angle measurements. The sessile drop method and the underwater-bubble method were used. The results obtained from these measurements are discussed in terms of contact angle and polymer-water work of adhesion hysteresis. On polished heat-polymerized samples this hysteresis results from the reorientation of superficial polymer chains. The combined effect of increased sample roughness and of the entrapment of water droplets in the pores of material gives rise to the highest contact-angle hysteresis observed on sand-abraded samples. On the basis of physical analysis of the mechanism involved in complete denture retention, developed in Part I of this work, it is believed that the sand-abraded material is the most convenient for the retention of the complete denture.
Acrylic Resins↗
Dental acrylic resin radiopacity: literature review and survey of practitioners' attitudes.
This study was initiated to ascertain the existence and some specifics of medical problems caused by traumatic ingestion/aspiration of fragments of radiolucent dental prostheses, and to evaluate opinions of radiopacity inclusion. A survey of 50 United States departments of oral surgery and emergency medicine yielded a 60% response. Results indicated that such medical problems are seen and would be reduced by incorporation of radiopaque materials. However, current technology cannot produce clinically acceptable levels of radiopacity without degrading physical and esthetic properties of the acrylic resin.
Acrylic Resins↗
The bond strength of elastomer tray adhesives to thermoplastic and acrylic resin tray materials.
This study evaluated the bond strength of selected impression materials (Permlastic, Express, and Hydrosil) to a thermoplastic custom tray material as a function of drying time of the adhesive after application to a tray material. In addition, bond strengths of a polysulfide impression material to an acrylic resin tray material and to a thermoplastic tray material made directly against wax were evaluated. Bond strengths were obtained directly from values of applied load at failure and important conclusions were drawn.
Acrylic Resins↗
An acrylic resin core for processing silicone facial prostheses.
A technique is presented for making an acrylic resin core for processing silicone facial prostheses. This technique ensures a durable core that can be used to make multiple prostheses. The core resists fungal growth during storage and creates a smooth, easily cleanable internal surface for a facial prosthesis. The core also permits a controllable thickness and therefore a lighter prosthesis.
Acrylic Resins↗
The effect of disinfection procedures on flexural properties of denture base acrylic resins.
This study evaluates the effects of long-term disinfection immersion on the flexural properties of denture base resins; it was conducted against a background of increasing awareness of the importance of cross-infection control in dental clinics and laboratories. The transverse bend testing procedure used followed that specified in the International Standard for denture base polymers. The results demonstrate that alcohol-based disinfectants are not suitable for use with denture base materials of non-cross-linked acrylic resin.
Acrylic Resins↗
Dimensional accuracy and stability of acrylic resin denture bases.
Proponents of injection molding systems have claimed a number of benefits over conventional press-pack dough molding systems. The aim of this study was to evaluate a recently developed injection (dry heat) procedure of processing compared with press-pack dough molding utilizing three curing cycles. The dimensional accuracy and stability of acrylic resin bases produced by the two molding procedures were compared. Dimensional changes were assessed over a period of 4 months using an optical comparator. The results demonstrate that baseplates produced by the injection molding procedure exhibit less shrinkage than those produced by the conventional press-pack procedures.
Acrylic Resins↗