Adhesive bond strengths using self- and light-cured composites.

AIM: To evaluate the microtensile bond strength (microTBS) of four adhesive systems to dentin, using self- and light-cured resin composites. METHODS AND MATERIALS: Crowns of human molars were separated from the roots, and the occlusal surfaces were ground to obtain flat superficial dentin. Three etch-and-rinse adhesives--All-Bond 2, One-Step Plus, and OptiBond Solo Plus--and one self-etching primer system, Peak SE, were evaluated. Each adhesive group was divided into two subgroups according to the type of resin composite used. A self-cured (Bisfil 2B) or light-cured (Filtek Supreme Plus) resin composite build-up was incrementally inserted to the dentin after each adhesive system was applied. The bonded specimens were stored in water for 24 h and sectioned into beams. Microtensile testing was done, and the data were subjected to ANOVA and Fisher's PLSD test. RESULTS: The microTBS of All-Bond 2 and One-Step Plus was not affected by the type of resin composite used (p=0.3131 and p=0.1562, respectively). The microTBS of OptiBond Solo Plus was significantly reduced when used with self-cured resin composite (p<0.0001). Peak SE formed no bond of self-cured resin composite to dentin. CONCLUSION: Some adhesives do not effectively bond self-cured resin composite to dentin. CLINICAL SIGNIFICANCE: Incompatibility between adhesives with low pH and certain self-cured resin composites can cause clinical debonding of restorations.

Essentials of rebonding tooth fragments for the best functional and esthetic outcomes.

Crown and crown-root fractures of anterior teeth of children are common. Bonding of the crown fragment is a logical restorative treatment option when the trauma results in no or minimal violation of the biological width and when the crown fragment: (1) is retrieved following the trauma; (2) is relatively intact; and (3) adopts well to the remaining tooth. Reattachment of crown tooth fragments can provide favorable and long-lasting esthetics because the tooth's original anatomic form, color, and surface texture are maintained. Reattachment also restores function, provides a positive psychological response, and is a relatively simple procedure. The clinician, however, should clearly inform the patient about the limitations and prognosis of this treatment option. The purpose of this paper is to summarize the current knowledge about crown fragment reattachment and present recommendations for the best functional and esthetic outcomes. The rebonding technique is illustrated in detail with a clinical case report.

Reattachment of anterior teeth fragments: a conservative approach.

UNLABELLED: Coronal fractures of the anterior teeth are a common form of dental trauma that mainly affects children and adolescents. One of the options for managing coronal tooth fractures when the tooth fragment is available and there is no or minimal violation of the biological width is the reattachment of the dental fragment. Reattachment of fractured tooth fragments can provide good and long-lasting esthetics (because the tooth's original anatomic form, color, and surface texture are maintained). It also restores function, provides a positive psychological response, and is a relatively simple procedure. Patient cooperation and understanding of the limitations of the treatment is of utmost importance for good prognosis. This article reports on two coronal tooth fracture cases that were successfully treated using tooth fragment reattachment. CLINICAL SIGNIFICANCE: Reattachment of fractured tooth fragments offers a viable restorative option for the clinician because ot restores tooth function and esthetics with the use of a very conservative and cost-effective approach.