This study aimed to compare the effects of different enamel
etching techniques for bracket bonding strength. The sample
consisted of eighty human premolars were randomly divided into
four equal groups. The enamel surfaces of the teeth were etched
with 35% orthophosphoric acid in Group 1 , air abraded with
50 μm aluminum oxide prior to acid etching in Group 2, Trans
bond Plus Self-etching Primer (TPSEP) in Group 3 , Er: YAG
laser in Group 4. After enamel etching procedures, brackets were
bonded with Trans bond XT , then shear bonding test was
performed using a testing machine (Tinius Olsen).
The of this study was to evaluate the bonding strength of a
posterior composite restorations when two different types of
equipment methods were used for preparation of dentin (Erbium-doped
yttrium aluminum garnet laser (Er:YAG ) and diamond burs).
This study specimen consisted of Eighty molars, was divided
randomly into two main groups (40 molars were prepared with
diamond burs, and 40 molars were prepared with laser Er: YAG).
This study aimed to evaluate the effect of associating the application
of Erbium-YAG laser with rapid palatal expansion in adult patients.
Twenty four subjects aged between 13 - 21 years were randomly
assigned to either laser group (n=12) and cont
rol - traditional
treatment with RPE- group (n=12). Laser group patients were
undergone mucosal-bony perforations along midpalatal suture for
three interventions (one a month) by Erbium-YAG laser, and two
bands hyrax expander were cemented for all patients of groups.
Impressions were taken for all patients and dental changes post
activation and retention phases were collected and compared for
both groups.
The research has been done in Alassad University Hospital in Lattakia, from January 2009 to January 2011 and included 80 pseudophakic eyes of 80 patients ] 36 (45.0%) belonged to male sex and 44 (55.0%) females[ older than 15 years having PCO with
decreased best corrected Visual Acuity (VA) of two or more Snellen’s chart line. Before laser treatment, the VA was assessed and all patients were examined on slit lamp for IOP and to rule out the causes for reduced vision other than PCO. Then 2-3 mm size capsulotomy was done with Q-switched Nd: YAG Laser, with Abraham’s posterior capsulotomy lens, after topical anesthesia, by using minimum amount of energy and fewest numbers of pulses. Patients were followed for assessment of best corrected VA and for possible complications just after laser and at the end of 1st week, 2nd week and the 4th week. The post-laser treatment was advised in accordance with complications to each patient.
The types of PCO were fibrosis in 54 (67.5%) eyes, Elschnig pearls in 16 (20 %) eyes and wrinkling in 10 (12.5%) eyes. Pre-laser visual acuity was CF-6/60 in 42 (52.5%) eyes, 6/36-6/24 in 23 (28.75%) eyes and 6/18-6/12 in 15 (18.75%) eyes. Post-laser VA was improved to 6/9-6/6 in 60 (75%) eyes. Out of 80 patients, 10 (12.5%) eyes developed the complications due to YAG laser which included IOL pitting in 4 (5%) eyes, raised IOP in 1 (1.25%), uveitis in 2 (2.5%), iris bleeding (hyphema) in 1 (1.25%), vitreous in anterior chamber in 1 (1.25%), and cystoids macular edema (CME) in 01(1.25%) eye. None of the eye developed sight threatening complications like retinal detachment or macular hole. The 20 (25%) eyes did not achieve the significant improvement because of pre-existing pathology in the posterior segment that was not diagnosed at the time of screening due to thick PCO.
This means that Nd: YAG laser capsulotomy is effective and convenient method for doing capsulotomy in all types of PCO. It is free from the risk of endophthalmitis found in surgical capsulotomy.
The laser has been used as an alternative effective method of etching enamel surface for direct bonding of orthodontic brackets instead of phosphoric acid. The aim of this study was to compare shear bond strength of orthodontic brackets following Er-
YAG versus Nd-YAG Laser etching. Eighty human extracted upper premolars were collected and divided randomly into two equal groups; the buccal enamel surface of the first group was etched by Er-YAG laser while the second group was etched by Nd-YAG laser. Each group was divided into two equal subgroups according to the bonding material type (chemical cure resin or light cure resin). The mechanical test has occurred by using a universal testing machine (Instron). The finding showed that no statistically significant differences in mean of shear bond strength between (Nd-YAG, Er-YAG) Laser etching group were found regardless of the bonding type.
