Biomedical subjects
Publications and source records attributed to T P Croll.
Two cases illustrate the technique of treating enamel discoloration and decalcification by beginning with bur cutting and completing with microabrasion compound. This eliminates texture defects caused by bur cutting and reduces treatment time.
Glass-ionomer-resin cements carry the advantages of both traditional glass-ionomer cements (such as esthetics and fluoride ion leaching) and light-curing resins (such as adhesive bonding to tooth structure and rapid material hardening by visible light exposure). In addition, their physical properties are improved over those of self-hardening glass-ionomer cements. The glass-ionomer-resin cements can be used to restore primary teeth quickly and successfully. The technique for simultaneously restoring adjacent Class II lesions in primary teeth is presented.
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Enamel microabrasion is used to eliminate superficial enamel discoloration defects. This article presents a comprehensive review of the enamel microabrasion method and its results. Current technique and materials are described and six cases are used to illustrate various aspects of the procedure. The learning objective of this article is to familiarize the reader with the state-of-the-art of enamel microabrasion and to report the latest laboratory research in the field.
Bonded composite resin can be used for restoration of certain teeth with posterior proximal carious lesions. Successful restoration depends on careful tooth isolation, proper dentin and enamel bonding methods, selection of an appropriate composite resin, and ideal handling of all the restorative materials. This paper details a procedure for placing a mesio-occlusodistal bonded composite resin restoration in a maxillary premolar.
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Light-hardening glass-ionomer-resin restorative cement was introduced in 1992. Besides having the advantage of rapid initial hardening by application of visible light, the new formulations have better physical properties than do self-hardening glass-ionomer restorative materials. This article documents use of one such cement for restoration of Class II carious lesions in primary molars. The rationale for use of the new cement is reviewed.
Glass-ionomer cement and composite resin can be used in combination for restoration of an endodontic access preparation. Adhesive restorations using these materials avoid the problems of marginal leakage and tooth discoloration, characteristic of silver amalgam restorations, and preclude the need for complete-coronal restoration. A detailed clinical procedure for placement of a stratified glass-ionomer cement and composite resin restoration for an endodontically treated permanent incisor is described.
Clinical experiences with light-hardened glass-ionomer-resin restorative cement indicate that it has improved properties compared to self-hardening glass-ionomer cements. Wear resistance and other material strengths are improved so that the material can be considered for conservative Class I restorations in permanent teeth. This article details occlusal restoration of a permanent molar with one light-hardened glass-ionomer-resin cement and discusses the potential for such restorations.
Ingenuity in research and development of glass ionomer systems has slowly but surely improved their handling properties and appearance. The author reviews the latest developments in relation to esthetic dentistry.
This study evaluated the relationship of polymerization shrinkage during composite resin veneer placement to direction of the polymerization light source. Fifty maxillary permanent incisors were obtained and divided into five groups of ten. Groups I and II had preparations placed in enamel. Groups III, IV, and V had preparations placed in dentin. In groups I and III, an unfilled bonding resin was placed and polymerized from the facial aspect, followed by placement and polymerization of a hybrid composite resin. Groups II and IV were initially polymerized from the lingual direction. In group V, the unfilled resin and hybrid composite resin were polymerized simultaneously from the facial aspect. Statistical analysis indicated that there was significantly less axial microgap formation during lingual polymerization when the preparation remained in dentin, but demonstrated that there was no statistically significant difference when the preparation remained in enamel.
Bonded glass-ionomer-silver-cement cement and visible light-hardened glass-ionomer liner and base material have proven to be reliable dentinal and enamel restoratives since the mid-1980s. When used within their limitations, they offer advantages over mechanically interlocked silver amalgam material. A light-hardened glass-ionomer-resin cement restorative material, which appears to have greater wear resistance and fracture toughness than prior glass-ionomer cements, has been introduced. This paper describes use of the new material and discusses its potential future implications.
Glass-ionomer-silver-cermet cement has proved to be a worthy alternative to silver amalgam for restoring certain Class I lesions in primary teeth. Such restorations are now known to last up to 8 years without need for repair or replacement. Cermet cement has also been used for interim restoration of permanent teeth in special cases, with ideal results. The procedure for placing a glass-ionomer-silver-cermet cement Class I restoration is described.
Severely fractured anterior teeth often require immediate repair, while long-term restoration is delayed until a healing period is completed. This paper details a technique of immediate emergency repair of a fractured mandibular incisor followed by placement of a bonded composite resin complete-coronal restoration months later. Careful diagnosis, gentle handling of the freshly traumatized tooth and surrounding tissues, and ideal selection and use of the respective bonding materials are necessary to ensure eventual replication of form, function, and tooth shade when the long-term restoration is placed.
Improvements in dental materials and methods of their use necessitate continuing modifications of clinical techniques. This paper details a step-by-step procedure for restoring a Class V carious lesion with polishable, visible light-polymerizing composite resin combined with one of the new-generation dentin-enamel bonding systems.
Certain enamel coloration defects can best be eliminated by a combination of treatment methods. This report describes the treatment of two patients whose enamel discoloration was corrected with a combination of enamel microabrasion and patient-administered dental bleaching with a carbamide peroxide gel solution.
The most durable and reliable method of retaining a primary molar in the mouth after a pulpotomy procedure is complete-coverage restoration with a preformed stainless steel crown. This paper describes a method for performing pulpotomy and stainless steel crown restoration of a primary molar. Neither formocresol, glutaraldehyde, nor calcium hydroxide is used during the pulpotomy phase of the treatment.