Evaluation of shear bond strength of silorane resin to conventional, resin-modified glass ionomers and nano-ionomer cements.

AIM: To evaluate the shear bond strength of silorane composite resin to conventional and resin-modified glass ionomer cements. MATERIALS AND METHODS: Shear bond strengths of Vitrebond (Group I), Ketac N100 (Group II) and Ketac Bond (Group III) glass ionomer cements to the composite Filtek P90 were evaluated. The bond strength was tested using a universal testing machine at a cross-head speed of 0.5 mm/min. Comparison between the groups was carried out using an analysis of variance test and pairwise comparison using Tukey's post-hoc test with a significance level of P ≤ 0.05. RESULTS: The measured bond strengths were 17.14 ± 3.39 MPA for Group I (Vitrebond), 15.34 ± 3.39 MPa for Group II (Ketac N100) and 14.12 ± 2.79 MPa for Group III (Ketac Bond). Group I achieved higher bond strength than Groups II and III. CONCLUSIONS: Resin-modified glass ionomer cement (i.e. Vitrebond) appears to be preferable to nano-ionomer glass ionomer cement (i.e. Ketac N100) and conventional glass ionomer cement (i.e. Ketac Bond) as a base under low-shrink posterior composite (i.e. Filtek P90).

The effect of various surface contaminants on the microleakage of two different generation bonding agents: A stereomicroscopic study.

AIM: The aim of this in vitro study was to evaluate the microleakage of two different generation bonding agents in the presence of various surface contaminants. MATERIALS AND METHODS: Class V cavities were prepared on 150 extracted human permanent molars. The samples were randomly divided into two main groups of 75 teeth each. Group I: Fifth generation bonding system (Single Bond, 3M). Group II: Seventh generation bonding system (iBond, Kulzer). Subgroups were formed according to exposure to different surface contaminants (saliva, blood, caries disclosing agent and haemostatic agent). Cavities were restored with hybrid composite (Z-100, 3M) and evaluated for microleakage. The scores were subjected to 't' test and analysis of variance (ANOVA) test. RESULTS: Single Bond and iBond did not provide complete resistance to microleakage when there was no contamination. Microleakage was minimum in the no contamination subgroup and maximum with the haemostatic agent subgroup for both the groups. CONCLUSION: Single bond showed lesser micro leakage in contaminated conditions.

Endo-perio lesions: diagnosis and clinical considerations.

The interrelationship between periodontal and endodontic disease has aroused confusion, queries and controversy. Differentiating between periodontal and endodontic problems can be difficult. A symptomatic tooth may have pain of periodontal and/or pulpal origin. The nature of that pain is often the first clue in determining the etiology of such a problem. Radiographic and clinical evaluation can help clarify the nature of the problem. In some cases, the influence of pulpal pathology may create periodontal involvement. In others, periodontal pathology may create pulpal pathology. This review article discusses the various clinical aspects to be considered for accurately diagnosing and treating endo-perio lesions.

Dental ceramics: An update.

In the last few decades, there have been tremendous advances in the mechanical properties and methods of fabrication of ceramic materials. While porcelain-based materials are still a major component of the market, there have been moves to replace metal ceramics systems with all ceramic systems. Advances in bonding techniques have increased the range and scope for use of ceramics in dentistry. In this brief review, we will discuss advances in ceramic materials and fabrication techniques. Examples of the microstructure property relationships for these ceramic materials will also be addressed.

Nonsurgical management of endodontic mishaps in a case of radix entomolaris.

Anatomic variations can significantly contribute to the incidence of endodontic mishaps. Perforations and separated instruments form the bulk of such mishaps. Furcal perforations are undesired complications of endodontic treatment, which result in the loss of integrity of the root and further destruction of the adjacent periodontal tissues. Mineral trioxide aggregate (MTA) is a promising material that has been successfully used to repair perforations. This clinical case demonstrates the use of MTA as a repair material for furcal perforation due to an iatrogenic error in radix entomolaris in the mandibular first molar. It also describes the application of ultrasonic technique in the retrieval of separated instrument from the same. Both clinical and radiographic follow-up showed a stable condition without any probing defect, ongoing root resorption, or furcal pathosis.

Is it the end of the road for dental amalgam? A critical review.

The longevity of dental restorations is dependent on many factors, including those related to materials, the dentist, and the patient. Dental amalgams have successfully served the profession for over a century. The main reasons for restoration failure are secondary caries, fracture of the bulk of the restoration or of the tooth, and marginal deficiencies and wear. The importance of direct-placement, aesthetic, tooth-colored restorative materials is still increasing. Amalgam restorations are being replaced because of alleged adverse health effects and inferior aesthetic appearance. All alternative restorative materials and procedures, however, have certain limitations. This article will attempt to critically analyse both amalgams and resin based composites, through an evaluation of scientific literature.