Laser skin resurfacing of the face with a combined CO2/Er : YAG laser

BACKGROUND. A combined, dual-wavelength CO2/Er:YAG laser system having the ability to deliver both clean ablation of skin with the erbium wavelength a nd a simultaneous deeper penetrating subablative thermal pulse of CO2 was d eveloped for full-face resurfacing. The CO2 component can be pulsed from 1 to 100 msec at a power of 1-10 W with the Er:YAG component pulsed at 350 mu sec at 1.7 J/cm(2) through either a computer pattern generator with 3 mm d iameter spot size or through a non-collimated spot ranging from 0.2 to 8 mm in diameter. Our previous study using this laser on the neck using a 4-8 m m diameter spot with Er:YAG fluence at 1.7 J and the CO2 at 5 W with a 50 m sec pulse at a frequency of 10 Hz showed a higher degree of overall patient satisfaction, as well as improvement in skin texture and skin color, compa red to patients treated with an Er:YAG laser alone. OBJECTIVE. This study evaluated the CO2/Er:YAG laser treatment modality in facial resurfacing. METHODS. Ten patients were treated with four passes at 1.7 J with a 4 mm di ameter spot and the CO2 at 5 W with a 50-msec pulse at a frequency of 10 Hz , Photoaging scores as well as thermal damage and new collagen formation we re compared immediately before and after treatment as well as at 2 weeks an d 3 months poseoperatively. RESULTS. The average pretreatment periorbital score was 6.2 The average pos ttreatment periorbital scores were 4.2 (P = .0239) at 2 weeks postoperative ly (32% improvement) and 3.8 (P = .0028) at 3 months postoperatively (38% i mprovement). The average pretreatment perioral score was 5.9. The average p osttreatment perioral scores were 3.0 (P = .0001) at 2 weeks postoperativel y (49% improvement) and 3.3 (P = .0003) at 3 months postoperatively (44% im provement), The average pretreatment cheek score was 4.7, The average postt reatment cheek scores were 2.7 (P = .0066) at 2 weeks postoperatively (43% improvement) and 3.8 (P = .0152) at 3 months postoperatively (36% improveme nt). The average pretreatment forehead score was 4.7, The average posttreat ment forehead scores were 3.8 (P = .0340) at 2 weeks postoperatively (33% i mprovement) and 3.6 (P = .0147) at 3 months postoperatively (37% improvemen t). The average depth of collagen measured in the dermis pretreatment was 2 9 mu m The average depth of collagen 3 months posttreatment was 54 mu m. Th is is an average increase of 25 mu m or an 86% increase in collagen (P = .0 06). The average thermal damage immediately after treatment was 20 mu m. CONLCUSION. The CO2/Er:YAG laser utilized with four passes at the above-men tioned parameters results in a similar degree of improvement as other forms of laser resurfacing with high-energy, short-pulsed CO2 lasers.