Journal of Oral Science Research

Journal of Oral Science Research ›› 2025, Vol. 41 ›› Issue (2): 155-160.DOI: 10.13701/j.cnki.kqyxyj.2025.02.012

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Retrospective Study on Impact of Interproximal Contact Changes of Single Crown Implants in Mandibular First Molars on Peri-implant Soft and Bone Tissues Health

LUO Xin1,2, LIU Honghong1,2*, ZHANG Zhihong1,2, CHEN Jia1,2, ZHU Dongao1,2, YU Mengqin1,2   

  1. 1. Department of Stomatology, The First Affiliated Hospital of USTC, Division of Life Science and Medicine, University of Science and Technology of China,Hefei 230000, China;
    2. College of Stomatology,Bengbu Medical University,Bengbu 233000,China
  • Received:2024-08-16 Online:2025-02-28 Published:2025-02-26

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Abstract: Objective: To observe the changes in interproximal contact of single crown implant in mandibular first molar after one year of loading, and to analyze the impact of these changes on the health of peri-implant soft and bone tissues and patient satisfaction. Methods: A total of 48 patients with 54 implants, who completed implant restoration at the Oral Medicine Center of the First Affiliated Hospital of the University of Science and Technology of China from April 2022 to August 2023 were selected. Dental floss was used to evaluate the proximal and distal interproximal contact relationship of dental crowns. The results were recorded as: tight contact, loose contact, or no contact. Follow-up visits were conducted at 6 and 12 months post-loading to record the current interproximal contact and peri-implant probing depth, plaque index, and gingival index. Cone beam computed tomography (CBCT) was performed at 12 months to measure peri-implant bone resorption, and a simple questionnaire survey was conducted for each patient. Results: Changes in interproximal contact were observed in 35.2% and 44.6% of cases at 6 and 12 months post-loading, respectively. The plaque index and gingival index in the loose contact group were significantly higher than those in the tight contact group at 6 months and 12 months (P<0.05). At 12 months, the probing depth in the no contact group was statistically significantly different from that in the tight contact group (P<0.05). Compared with the baseline period, there was a statistically significant difference in gingival index after 6 months and 12 months (P<0.05), while there was no statistically significant difference in other parameter groups (P>0.05).There was no significant difference in bone resorption around the implants among the three groups (P>0.05). Patients with changes in proximal contact were more likely to experience food impaction, which affected their satisfaction with the restoration outcome (P<0.05). Conclusion: Changes in the interproximal contact of mandibular first molars implant crowns increase the risk of food impaction and affect patient satisfaction. These changes also have some impact on the health of peri-implant soft tissues but do not show a significant impact on peri-implant bone resorption.

Key words: implant dentures, proximal contact, bone resorption, satisfaction