Sering ditemukan keluhan pada beberapa pasien mengenai gusi yang berwarna kehitaman, walaupun tidak merokok, dan ini sangat menganggu penampilan. Hiperpigmentasi gingiva dapat menjadi masalah individu, seperti bagian labial nampak saat tertawa atau berbicara, terutama dengan gummy smile. Depigmentasi dihilangkan tindakan electrosurgery, bedah periodontal, ablasi laser. Studi kasus bertujuan unt...

background and aims. a proper bond must be created between the existing composite resin and the new one for successful repair. the aim of this study was to compare the effect of three mechanical surface treatments, using diamond bur, air abrasion, and er,cr:ysgg laser, on the repair bond strength of the silorane-based composite resin. materials and methods. sixty cylindrical composite resin spe...

We investigated room-temperature pulsed lasing in heavily doped Fe:ZnSe single crystals. The active elements were pumped by a Q-switched Cr 3+ :Yb :Ho :YSGG laser operating at 2.87 μm. Our results show that the generation of short pulses has deep high-frequency modulation associated with relaxat...

Ce3+-activated Gd3Al5O12 garnet, effectively stabilized by Lu3+ doping, has been developed for new yellow-emitting phosphors. The powder processing of [(Gd1-x Lu x ) 1-y Ce y ]3Al5O12 solid solutions was achieved through precursor synthesis via carbonate precipitation, followed by annealing. The resultant (Gd,Lu)AG:Ce3+ phosphor particles exhibit typical yellow emission at ∼570 nm (5d-4f transi...

A garnetite that occurs locally in phyllitic schists exposed by the Santorini caldera consists mainly of euhedral garnet crystals showing alternating isotropic and birefringent lamellae. X-ray diffraction revealed two garnets with unit cell dimensions a of I2.o52:ko-oo2 and I~'984-ko-oo5 A, corresponding respectively to almost pure andradite and a granditic phase. Mean compositions determined b...