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Purpose. The purpose of the study is to evaluate the maxillary ridge change under complete dentures opposed by mandibular overdentures assisted by four mini-implants, in case of inter-foraminal distribution or in case of wide distribution after wearing dentures for 6 years. Methods and material. The subjects enrolled for this study (n = 20). They were treated with maxillary complete dentures, randomly assigned into two equal groups: group І received mandibular overdenture assisted by four mini implants distributed equally in the inter-foraminal region exposed to immediate loading protocol. Group II received mandibular overdenture assisted by four mini-implants (two inserted in canine region and two inserted in first molar region) exposed to immediate loading protocol. Radiographic evaluation of maxillary bone height using digital panorama for every patient of both groups recorded at the time of mini-implants insertion and after 6 years. Results: The results showed non- significant differences using independent t-test between wide & inter-foraminal distribution groups for midline, premaxilla. While, for maxillary tuberosity, the results give significant difference between wide & inter-foraminal distributions at significant levels P Conclusion: the combination syndrome also may occur in conventional maxillary dentures opposed by mini implants assisted mandibular overdentures and wide mini implants distribution has similar effect as inter-foraminal distribution in the maxillary alveolar ridge resorption.

Effect of different mini implants distribution for mandibular overdenture cases on maxillary ridge height. retrospective radiographic study