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Influence of marginal bone resorption on two mini implant-retained mandibular overdenture: An in vitro study

Journal of Advanced Prosthodontics 2021년 13권 1호 p.55 ~ 64
Guo Ying, Kono Kentaro, Suzuki Yasunori, Ohkubo Chikahiro, Zeng Jian-Yu, Zhang Jing,
소속 상세정보
 ( Guo Ying ) - Capital Medical University Beijing Shijitan Hospital Department of Stomatology
 ( Kono Kentaro ) - Tsurumi University School of Dental Medicine Department of Removable Prosthodontics
 ( Suzuki Yasunori ) - Tsurumi University School of Dental Medicine Division of Oral and Maxillofacial Implantology
 ( Ohkubo Chikahiro ) - Tsurumi University School of Dental Medicine Department of Removable Prosthodontics
 ( Zeng Jian-Yu ) - Capital Medical University School of Stomatology Center for Dental Implantology
 ( Zhang Jing ) - Capital Medical University School of Stomatology Center for Dental Implantology

Abstract


PURPOSE: To investigate the biomechanical effect of marginal bone resorption (MBR) on the mandibular mini implant (MI)-retained overdenture (MI-OD) on the edentulous model.

MATERIALS AND METHODS: The experimental mandibular edentulous model was modified from a commercial model with 2 mm thick artificial soft tissue under denture base. Two MIs (Φ2.6 mm × 10 mm) were bilaterally placed between the lateral incisor and the canine area and attached with magnetic attachments. Three groups were set up as follows: 1) alveolar bone around the MI without MBR (normal group), 2) with MBR to 1/2 the length of the implant (resorption group), and 3) complete denture (CD) without MI (CD group). Strain around the MI, pressure near the first molar area, and displacement of denture were simultaneously measured, loading up to 50 N under bilateral/unilateral loading. Statistical analysis was performed using independent-samples t test and one-way ANOVA (α=.05).

RESULTS: The strain around the MI with MBR was approximately 1.5 times higher than that without MBR. The pressure in CD was higher than in MI-ODs (P <.05), while there was no statistical difference between the normal and resorption group (P >.05). Similarly, the CD demonstrated a greater displacement of the denture base than did the MI-ODs during bilateral and unilateral loadings (P <.05).

CONCLUSION: The strain around the MI with MBR was approximately 1.5 times higher than that without MBR. The pressure on posterior alveolar ridge and denture displacement of MI-ODs significantly decreased compared to CDs, even when MBR occurs. Bilateral balanced occlusion was recommended for MI-ODs, especially when MBR occurred.

키워드

Mini dental implant-retained overdenture (MI-OD); Marginal bone resorption (MBR); Magnetic attachment; Strain; Pressure distribution

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