Influence of different surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics.

The effect of surface finishing techniques on machinable ceramics to obtain optimum smoothness is unclear. The aim of the study was to evaluate the effects of surface finishing techniques on machinable feldspathic and leucite-reinforced ceramics. Forty specimens were divided into four subgroups according to surface finishing techniques and ceramic structure. A profilometer was used to evaluate surface roughness. A spectrophotometer was used to obtain the CIE L*, a* and b* coordinates. All specimens were subjected to a three-point bending test to determine flexural strength. All data were analyzed with two-way ANOVA and Tukey's HSD tests (p<0.05). Polishing techniques were found to be more effective than the glazing method to obtain smooth surfaces. Glazing technique increased the flexural strength of leucite-reinforced ceramics. Finishing procedures have different effects on the success of the restorations and must be considered by the clinicians.

An adult case of temporomandibular joint osteoarthritis treated with splint therapy and the subsequent orthodontic occlusal reconstruction.

Herein we report treatment for a 19-year-old female patient with severe osteoarthritis of the temporomandibular joint. The patient had severe open bite with a Class II molar relationship. She had limited mouth opening and pain. Clinical examination and magnetic resonance imaging revealed that she had anterior disc displacement without reduction. By splint therapy, limited mouth opening and pain was eliminated, but an anterior open bite developed after the treatment. By orthodontic treatment, an acceptable occlusion was achieved with a Class I molar relationship.

Dorsal pancreatic agenesis.

CONTEXT: Agenesis of the dorsal pancreas is a rare entity and might present with various symptoms. We report a case which presented with chronic pancreatitis. CASE REPORT: The patient presented with epigastric pain and we found dorsal pancreatic agenesis causing chronic pancreatitis. CONCLUSIONS: Dorsal pancreatic agenesis can be easily diagnosed with new techniques and its association with clinical syndromes can be better understood.

Effects of saliva contamination on shear bond strength of compomer to dentin in primary teeth.

PURPOSE: To investigate the effects of saliva contamination on the bond strengths of two compomers applied to primary teeth dentin during different bonding stages. METHODS: 30 extracted human non-carious primary molars were prepared for shear bond-strength testing. Specimens were randomly divided into three groups of 10. Prime & Bond NT (acetone-based) and Futura Bond A & B (water-based) adhesives were tested under the following conditions: (a) non-contaminated conditions; (b) after contamination of the dentin surface with fresh whole saliva for 20 seconds and removal of excess saliva before adhesive application; and (c) contamination of the dentin surface with fresh whole saliva for 20 seconds and removal of excess saliva after adhesive curing. Following adhesive application Dyract AP or Glasiosite was applied via a polytetrafluroethylene split mould and light-cured to the dentin surface. Shear bond strengths were measured using an Instron Universal testing machine running at a crosshead speed of 1 mm/minute. After measuring shear bond strengths, specimens were prepared for SEM evaluation and identification of failure type. Results were analyzed by two-factor experiment with repeated measures as one factor. RESULTS: No statistically significant differences were found among the shear bond strengths (P > 0.05) of the groups. The results revealed that saliva contamination of dentin surfaces before or after adhesive application did not affect the shear bond strength of either compomer.