Effect of Er:YAG laser enamel conditioning and moisture on the microleakage of a hydrophilic sealant

For a given sealant, successful pit and fissure sealing is principally governed by the enamel conditioning technique and the presence of moisture contamination. A new generation of hydrophilic resin sealants is reported to tolerate moisture. This study investigates the impact of Er:YAG laser pre-conditioning and moisture contamination on the microleakage of a recent hydrophilic sealant. Occlusal surfaces of extracted human molars were either acid etched (n = 30), or successively lased and acid etched (n = 30). Ten teeth from each group were either air-dried, water-contaminated, or saliva-contaminated prior to sealing with UltraSeal XT® hydro™. Samples were inspected for penetration of fuchsin dye following 3000 thermocycles between 5 and 50 °C, and the enamel–sealant interfaces were observed by scanning electron microscopy (SEM). Significant differences in microleakage were evaluated using the Mann–Whitney U test with Bonferroni adjustment (p = 0.05). Laser pre-conditioning significantly reduced dye penetration irrespective of whether the enamel surface was moist or dry. Microleakageof water-contaminated acid etched teeth was significantly greater than that of their air-dried or saliva-contaminated counterparts. SEM analysis demonstrated good adaptation in all groups with the exception of water-contaminated acid etched teeth which exhibited relatively wide gaps. In conclusion, this hydrophilic sealant tolerates the presence of saliva, although water was found to impair its sealing ability. Laser pre-conditioning significantly decreases microleakage in all cases

The effect of neostigmine on postoperative ileus and the healing of colon anastomoses

Objectives: The aim of this study was to assess the effects of neostigmine on the postoperative ileus and the healing of colon anastomoses

Effects of hyaluronic acid-carboxymethylcellulose antiadhesion barrier on ischemic colonic anastomosis - An experimental study

Purpose: Intraperitoneal adhesions may help the healing of marginally viable bowel ends. If adhesion formation is prevented by various methods, the integrity of ischemic bowel anastomosis may be compromised. Thus, we decided to study the effects of hyaluronic acid-carboxymethylcellulose, an antiadhesion barrier, on ischemic bowel anastomosis. Methods: Thirty Wistar-Albino rats were divided into three groups. In Group A (control), a well-perfused distal colonic segment was transected, and free ends were anastomosed. In Group B, an ischemic colonic segment was prepared, then divided and anastomosed. In Group C, after completion of ischemic colonic anastomosis, hyaluronic acid-carboxymethylcellulose film was wrapped around the anastomosis. In all groups, rats were killed on the seventh day. Intraperitoneal adhesions were graded by adhesion score, and healing of the anastomosis was assessed by measurement of bursting pressure and hydroxyproline levels in the anastomotic tissue. Results: A statistically significant difference was found between hydroxyproline levels of the control group and the ischemic group (P=0.02). HP level was also significantly higher in the hyaluronic acid-carboxymethylcellulose group than in the ischemic group (P=0.01). There was no difference in hydroxyproline levels between the control and hyaluronic acid-carboxymethylcellulose groups. Compared with the control group, bursting pressure was lower in the ischemic group (P=0.02). Hyaluronic acid-carboxymethylcellulose wrapping increased the bursting pressure significantly (P<0.001). However, there was no difference in bursting pressure between the control group and the hyaluronic acid-carboxymethylcellulose group (P=0.13). A marked increase in the adhesion score was observed in the ischemic group (P=0.01). The difference between adhesion scores of the hyaluronic acid-carboxymethylcellulose and ischemic groups was not found to be significant, although the adhesion score in the hyaluronic acid-carboxymethylcellulose group was lower (P=0.16). There was no difference in adhesion score between the control and hyaluronic acid-carboxymethylcellulose groups. Conclusions: Application of hyaluronic acid-carboxymethylcellulose in ischemic colonic anastomosis did not compromise anastomotic integrity. The adverse effect of ischemia on healing of colonic anastomosis was counteracted by hyaluronic acid-carboxymethylcellulose