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Effect of zirconia surface topography on epithelial attachment following diode laser-assisted crown lengthening: A
Mohamed H Helal1, Mohamed Yehia Abdelfattah2,3, Mohamed T Elhalawani4,5
1Oral Medicine, Periodontology, Oral Diagnosis and Radiology Department, Faculty of Dentistry, Tanta University, Tanta, Egypt.
Objective:
To evaluate the effect of zirconia surface topography on epithelial attachment and peri-restorative soft tissue healing following diode laser-assisted crown lengthening.
Materials And Methods:
A controlled split-mouth experimental study was conducted in 12 Beagle dogs. Bilateral mandibular sites received CAD/CAM zirconia restorations with either glazed or micro-roughened cervical surfaces. Crown lengthening was performed using a diode laser, followed by full thickness mucoperiosteal flap elevation and osteoplasty. Clinical parameters and histomorphometric analysis were assessed at 2 and 4 weeks postoperatively.
Results:
Micro-roughened zirconia surfaces demonstrated significantly enhanced epithelial attachment, improved collagen organization, and superior soft-tissue adaptation compared with glazed surfaces (P < 0.05). At 2 weeks, inflammatory infiltration and disorganized collagen were observed. By 4 weeks, marked tissue maturation and epithelial integration were evident, particularly in the micro-roughened group.
Conclusion:
Zirconia surface topography significantly influences peri-restorative soft tissue healing. Micro-roughened surfaces promote superior epithelial attachment and tissue integration following laser-assisted crown lengthening.
