Bone tissue microscopic findings related to the use of diode laser (830 nm) in ovine mandible submitted to distraction osteogenesis.
OBJECTIVE
To analyze the microscopic characteristics of the effect of Gallium-Aluminum Arsenid diode laser (GaAlAs - 830etam) applied during the activation and consolidation period to ovine mandibles submitted to distraction osteogenesis.


METHODS
Eighteen sheep underwent surgery in order to have bone distractors implanted in the left side of the jaw area. They were divided into three groups: 1 - Control; 2 - Laser irradiation during the activation period; 3 - Laser irradiation during the fixation period. The irradiation was carried out in five sessions, on every other day, with 4,0J/cm(2) doses applied to four pre-established areas, totaling 16J per session. After four days of latency under post-operative care, ten days of distractor activation (at 1mm/day) and twenty-one days of fixation the animals were sacrificed and the devices removed for microscopic analysis.


RESULTS
The groups that received laser irradiation (GaAlAs) presented a greater amount of mineralized bone trabeculae when compared to the Control Group. Despite that, cartilaginous tissues were also found in Group 2.


CONCLUSIONS
The laser has been more favorable when used in the consolidation period, after bone elongation.
Cerqueira
Arlei
A
Department of Oral and Maxillofacial Surgery and Traumatology, Roberto Santos Hospital, Salvador, Bahia, Brazil.
Silveira
Roger Lanes
RL
Oliveira
Marília Gerhardt de
MG
Sant'ana Filho
Manoel
M
Heitz
Cláiton
C
D000818:Animals; D001857:Bone Matrix; D001861:Bone Regeneration / Q000528:radiation effects; D002113:Calcification, Physiologic / Q000502:physiology / Q000528:radiation effects*; D004195:Disease Models, Animal; D005260:Female; D054023:Lasers, Semiconductor / Q000627:therapeutic use*; D008334:Mandible / Q000528:radiation effects / Q000601:surgery* / Q000648:ultrastructure; D019857:Osteogenesis, Distraction / Q000295:instrumentation; D011182:Postoperative Care; D012756:Sheep; D013997:Time Factors; D014945:Wound Healing / Q000528:radiation effects