67 QOL related to mastication in maxillectomy patients 4 Table 1 - Continued Patient characteristics Implantsupported obturators n = 9 Conventional obturators n = 10 p-value Brown-classification Ia 1 0 IIa 0 3 IIb 2 5 0.021a,* IIc 1 0 IId 5 0 soft palate 0 2 Dental status mandibular Natural dentition 3 1 Implant-supported lower denture 4 3 0.091a Conventional lower denture 2 6 Note: Brown vertical classification. I: maxillectomy not causing an oronasal fistula; II: not involving the orbit. Brown horizontal classification. a: palatal defect only. not involving the dental alveolus; b: less than or equal to 1/2 unilateral; c: less than or equal to 1/2 bilateral or transverse anterior; d: greater than 1/2 maxillectomy. Soft palate not part of Browns classification with only a defect in the soft palate. a χ²-test. bt Test. cFisher’s exact test. *p<.05. Quality of life related to masticatory performance The Shapiro-Wilk test showed a non-normal distribution of the MAT outcomes; therefore, the Mann-Whitney U test was used.
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