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<p>Partial edentulism alters occlusal loading and may affect temporomandibular joint (TMJ) morphology. This prospective comparative study evaluated whether implant-supported fixed prostheses and removable partial dentures (RPDs) differentially restore TMJ joint-space distribution in Kennedy Class II cases using cone-beam computed tomography (CBCT). Thirty adults with unilateral free-end edentulism (loss of 2–3 posterior units) received either implant-supported fixed restorations (<i>n</i> = 15) or RPDs (<i>n</i> = 15); fifteen dentally healthy adults served as controls. CBCT scans were obtained at two time points: pre-rehabilitation (baseline) and 6 months after completion of prosthetic rehabilitation. Lateral (LJS), medial (MJS), superior (SJS), anterior (AJS), and posterior (PJS) joint spaces were measured; medio-lateral (LJS–MJS) and antero-posterior (AJS–PJS) differences were derived. Before rehabilitation, patients showed abnormal LJS, MJS, and LJS–MJS versus controls (<i>p</i> &lt; 0.05). At 6 months after rehabilitation, significant between-group differences remained in LJS and LJS–MJS (<i>p</i> &lt; 0.05), whereas no significant between-group differences were observed in MJS or AJS–PJS. No statistically significant difference was observed between the two rehabilitation modalities; however, this finding should not be interpreted as evidence of equivalence.These findings suggest that Kennedy Class II patients may exhibit a predominantly coronal-plane imbalance of TMJ joint spaces, with residual differences from healthy controls remaining at 6 months after either implant-supported or removable rehabilitation. Within the limitations of this non-randomized CBCT-based study, these results should be interpreted as preliminary radiographic observations of short-term TMJ spatial adaptation rather than direct evidence of clinical benefit or disease-risk reduction.</p>

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Cone-beam CT analysis of temporomandibular joint morphology before and after rehabilitation in patients with Kennedy class II partial edentulism

  • 期刊论文

  • 发表日期：

    2026年7月20日

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  • Zhoubin Xia,
  • Jing Ren,
  • Zhishan Jian,
  • Yan Yan,
  • Guilin Liu,
  • Changhui Wang,
  • Liangju Cao

摘要

Partial edentulism alters occlusal loading and may affect temporomandibular joint (TMJ) morphology. This prospective comparative study evaluated whether implant-supported fixed prostheses and removable partial dentures (RPDs) differentially restore TMJ joint-space distribution in Kennedy Class II cases using cone-beam computed tomography (CBCT). Thirty adults with unilateral free-end edentulism (loss of 2–3 posterior units) received either implant-supported fixed restorations (n = 15) or RPDs (n = 15); fifteen dentally healthy adults served as controls. CBCT scans were obtained at two time points: pre-rehabilitation (baseline) and 6 months after completion of prosthetic rehabilitation. Lateral (LJS), medial (MJS), superior (SJS), anterior (AJS), and posterior (PJS) joint spaces were measured; medio-lateral (LJS–MJS) and antero-posterior (AJS–PJS) differences were derived. Before rehabilitation, patients showed abnormal LJS, MJS, and LJS–MJS versus controls (p < 0.05). At 6 months after rehabilitation, significant between-group differences remained in LJS and LJS–MJS (p < 0.05), whereas no significant between-group differences were observed in MJS or AJS–PJS. No statistically significant difference was observed between the two rehabilitation modalities; however, this finding should not be interpreted as evidence of equivalence.These findings suggest that Kennedy Class II patients may exhibit a predominantly coronal-plane imbalance of TMJ joint spaces, with residual differences from healthy controls remaining at 6 months after either implant-supported or removable rehabilitation. Within the limitations of this non-randomized CBCT-based study, these results should be interpreted as preliminary radiographic observations of short-term TMJ spatial adaptation rather than direct evidence of clinical benefit or disease-risk reduction.