Background and objective: many theorists have emphasized the difficulty of choosing suitable replacement teeth for edentulous patients and arranging these teeth in a natural way. In dentures, mesiodistal width of anterior teeth is the most important factor, because complete denture will not be able to provide a real appearance if dentures are too small. For a good occlusion, maxillary and mandibular teeth must be proportional in size; otherwise, occlusal relations will not be possible. The purpose of this study is to determine a correlation between average mesiodistal width of posterior teeth and anterior teeth. Materials and methods: The sample was consisted of 40 pairs of study casts of both jaws with normal occlusion (50% male and 50% female; aged 18-26). The mesiodistal width was measured directly on plaster models by digital caliper (Mitutoyo, Tokyo, Japan) at proximal contact point of the teeth. Measurements were repeated 1 day and 1 week later. Data was analyzed by using SPSS 10 (Statistical Package for Social Sciences SPSS Inc., Chicago, IL). Mean and standard deviation were calculated for each variable. Comparisons between female and male samples were made for each variable using Student's t test. Results: the mean ratio of the mesiodistal width of upper anterior sextant to upper posterior sextant was calculated for female and male samples (1.38 ± 0.1 and 1.36 ± 0.07m respectively). The mean ratio of mesiodistal width of lower anterior sextant to lower posterior sextant was calculated for female and male samples (1.00 ± 0.05 and 1.02 ± 0.05, respectively). Conclusions: the ratio of mesiodistal width of anterior teeth to posterior teeth can be used as a guideline for choosing correct dentures for partially edentulous patients.
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