PMC6317120_01
(a-e) Measurement of interforaminal mandibular height on panoramic radiographs of atrophied mandibles using the software SCANORA.
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Their residual alveolar ridges in the mandible were excessively resorbed and atrophied (Figure 1); mental foramina were just below the mucosa overlying alveolar ridges.
A CBCT scan of one patient with extensively resorbed mandibular alveolar ridge.
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Panoramic radiographs and CBCT scans (Figure 2) revealed that the height of the mandible between the mental foramina was less than 10 mm with a reduced buccolingual width.
(a) Extensively resorbed denture-bearing area in the mandible; (b) four mini dental implants inserted; (c) mandibular overdenture reinforced with the CoCr framework with matrices and O-rings inserted.
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Each patient received four MDIs (Ti-6Al-4V, Dentium, Seoul, Korea; 2.0 or 2.5 mm wide, 6 or 8 mm long) in the interforaminal region without reflecting a flap (Figure 3(b)). All new mandibular overdentures were reinforced with the CoCr framework to prevent denture fractures (Figure 3(c)).
Panoramic radiographs (a) before treatment, (b) after one year, and (c) after 2 years of wearing the mandibular overdenture.
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During insertion one mini dental implant fractured due to an insertion torque > 45 N/cm and was left as a sleeping implant in the bone, while an additional MDI was inserted for proper denture retention (Figure 4(a)). The control panoramic radiographs were made at the 1-year and 2-year observation stages (Figure 4).
Mean summary scores of the OHIP-14, chewing function questionnaire (CFQ), and orofacial esthetic scale (OES) prior to the treatment, after receiving new dentures and finished adjustments, at the one-year follow-up examination and the 2-year follow-up clinical examination.
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The obtained results are presented in Figure 5.