根分叉区骨缺损外形及牙龈表型对引导性牙周组织再生术疗效的影响分析

Analysis of the Influence of Root Fork Bone Defect Shape and Gingival Phenotype on the Efficacy of Guided Periodontal Tissue Regeneration

摘要: 牙周组织再生是牙周病治疗的终极目标之一，引导性牙周组织再生术(guided tissue regeneration, GTR)是治疗根分叉病变的有效手段，但其疗效存在较大变异性和不确定性。通过大量临床手术研究分析，对于磨牙，根分叉区骨缺损形态及牙龈表型是影响GTR术后再生效果的关键内在因素。本文系统阐述了根分叉区骨缺损的形态、深度、宽度、骨壁数量及根柱形态等关键外形指标及不同牙龈表型对GTR疗效的影响机制。分析认为，三壁骨缺损、窄而深的缺损形态、良好的根柱形态同时伴有软组织厚龈生物型能为膜下血凝块的稳定、再生空间的维持及干细胞的选择性附着提供有利的生物学环境，从而获得更可预测的再生效果，宽而浅的缺损、二壁或一壁骨缺损及薄龈生物型则因空间维持能力差、血供不足等原因，预后较差，长期临床实践发现对于薄龈型牙龈表型，软组织移植是提高治疗成功率、确保长期稳定性和美学效果的重要前提，术前通过临床和影像学手段精确评估缺损外形及软组织生物学表型是病例选择成功、制定合理手术方案并最终获得理想疗效的前提。

Abstract: Periodontal tissue regeneration represents one of the ultimate goals in periodontal disease treatment. Guided tissue regeneration (GTR) serves as an effective approach for managing furcation involvement, yet its efficacy exhibits considerable variability and uncertainty. Analysis of extensive clinical surgical studies indicates that for molars, the morphology of furcation bone defects and gingival phenotype constitute key intrinsic factors influencing the regenerative outcomes following GTR. This paper systematically elucidates the mechanisms by which key morphological indicators—including the shape, depth, width, number of bone walls, and root column morphology of furcation bone defects—along with different gingival phenotypes influence the efficacy of GTR. Analysis suggests that a three-wall bone defect, narrow and deep defect morphology, well-preserved root canal morphology, combined with a thick gingival biological type, provides a favorable biological environment for the stability of submembranous blood clots, maintenance of regenerative space, and selective attachment of stem cells. This leads to more predictable regenerative outcomes. Conversely, wide and shallow defects, two-wall or single-wall bone defects, and thin gingival biotypes exhibit poorer prognosis due to inadequate space maintenance and insufficient blood supply. Long-term clinical practice reveals that for thin gingival biotypes, soft tissue grafting is a crucial prerequisite for enhancing treatment success rates, ensuring long-term stability, and achieving aesthetic outcomes. Accurate preoperative assessment of defect morphology and soft tissue biological characteristics through clinical and imaging methods is essential for successful case selection, development of appropriate surgical plans, and ultimately achieving optimal outcomes.