J Periodontal Implant Sci.  2020 Aug;50(4):226-237. 10.5051/jpis.2000420021.

Effects of soft tissue grafting prior to orthodontic treatment on preventing gingival recession in dogs

• Song YW
• Jung H
• Han SY
• Paeng KW
• Kim MJ
• Cha JK
• Choi YJ
• Jung UW

• KMID: 2511780
• DOI: http://doi.org/10.5051/jpis.2000420021

Abstract

Purpose
This study was conducted to assess the efficacy of prophylactic gingival grafting in the mandibular anterior labial area for preventing orthodontically induced gingival recession.
Methods
Eight mongrel dogs received gingival graft surgery at the first (I1) and third (I3) mandibular incisors on both sides based on the following group allocation: AT group (autogenous connective tissue graft on I1), AT-control group (contralateral side in the AT group), CM group (xenogeneic cross-linked collagen matrix graft on I3) and CM-control group (contralateral side in the CM group). At 4 weeks after surgery, 6 incisors were splinted and proclined for 4 weeks, followed by 16 weeks of retention. At 24 weeks after surgery, casts were made and compared with those made before surgery, and radiographic and histomorphometric analyses were performed.
Results
Despite the proclination of the incisal tip (by approximately 3 mm), labial gingival recession did not occur. The labial gingiva was thicker in the AT group (1.85±0.50 mm vs.1.76±0.45 mm, P>0.05) and CM group (1.90±0.33 mm vs. 1.79±0.20 mm, P>0.05) than in their respective control groups.
Conclusions
The level of the labial gingival margin did not change following labial proclination of incisors in dogs. Both the AT and CM groups showed enhanced gingival thickness.

Keyword

Animal research; Collagen; Connective tissue; Gingival recession; Orthodontic tooth movement