The purpose of this study was to study the effect of XeCl excimer laser on smear layer covered dentine of extracted human teeth. Twenty-four freshly extracted human molar teeth were collected and randomly divided into one control group and three experimental groups of six teeth each (groups A-D). The teeth in the experimental groups were irradiated with XeCl 308-nm excimer laser at a fluence of 0.4 J cm-2 and a constant pulse repetition rate of 25 Hz. Group A was used as the control, while groups B, C and D were irradiated at different exposure times of 3, 5 and 7 s, respectively. Subsequently these teeth specimens were subjected to scanning electron microscopic (SEM) examination and energy dispersive X-ray (EDX) spectrometric analysis. The SEM examination revealed melting of the smear layer covered dentin to conceal the underlying dentinal tubules. At a longer exposure time (7 s), dentin melted to form large grains and this resulted in non-uniform closure of underlying dentinal tubules. Under the conditions of this study, it is concluded that the pulsed XeCl 308-nm excimer laser at a fluence of 0.4 J cm-2, with an exposure time of 5 s uniformly occluded exposed smear layer covered dentine with no conspicuous variation in chemical structure.

Recent trends have shown a decrease in nonoperative management for unstable distal radial fractures in elderly. The literatures available lack adequate information whether operative treatments are superior to nonoperative (cast) treatment. The purpose of this study was to compare the outcomes of two treatment methods that were used: (1) ORIF with volar locking plate and (2) closed reduction and plaster immobilization. 70 patients with a displaced and unstable distal radial fracture were randomized to ORIF with volar locking plate (n=35) or closed reduction and cast immobilization (n=35). Outcome was measured on the basis of the Patient-Rated Wrist Evaluation (PRWE) score; the Disabilities of the Arm, Shoulder and Hand (DASH) score; the pain level; the range of wrist motion; the rate of complications; and radiographic measurements including dorsal radial tilt, radial inclination, and ulnar variance. Patients in the operative treatment group had lower DASH and PRWE scores, indicating better wrist function in early postoperative period (p<0.05), but there were no significant differences between the groups at six and twelve months. Grip strength, dorsal radial tilt, radial inclination, and radial shortening were significantly better in the operative treatment group at the time of the latest follow-up (p<0.05).

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