> Static text version. Controls do not run in this Markdown file. [Open the matching HTML page]() for available page controls, navigation and browser printing. Understanding an assessment finding # Understanding an interarch tooth\-size finding A tooth\-size finding can describe a relationship between the upper and lower teeth\. Reading it means keeping three things together: which teeth were compared, which arch supplies the reporting reference and what the relative finding says\. If your clinician has explained a Bolton tooth\-size finding while discussing orthodontic or aligner care, this companion helps you follow that language\. Start with the relationship, then read the completed example below\. Adapted from Abd Rahman, Othman and Marya’s 2023 study\. [Read the source context and full credit]() \. [Width and proportion]() [The compared sets]() [A completed reading]() ## Tooth width and a two\-arch proportion answer different questions Interarch means between the upper and lower dental arches\. In a tooth\-size analysis, crown width means the side\-to\-side width of a tooth’s crown\. The widths of the teeth in a defined set are added together in each arch, and those upper and lower totals are compared as a proportion\. An individual width describes one tooth\. A summed width describes a selected set in one arch\. The interarch proportion describes how the two sets relate\. Larger absolute crown widths do not, by themselves, establish a larger upper/lower tooth\-size proportion\. That is why looking at one tooth, or calling teeth generally large, does not supply this two\-arch finding\. ## The label tells you which teeth belong in the comparison An anterior comparison uses the six front teeth in each arch\. An overall comparison uses a broader set, from the first molar on one side to the first molar on the other side in each arch\. Each label therefore identifies its own upper set and matching lower set\. Keep that scope with the finding\. An anterior finding describes the front\-tooth comparison; its wording alone does not supply an overall finding\. The set label answers “which teeth?” before the reporting reference answers “relative to what?” ## A completed reading: set, reference and relative finding This teaching example starts with three supplied items from an already established finding\. It is a language example, with no patient measurements or invented clinical record\. **Compared set** **Anterior comparison\.** The summed crown widths of the six upper front teeth are compared with those of the six lower front teeth\. **Supplied reporting reference** **Lower arch\.** The lower front\-tooth set supplies the reference for expressing this finding\. **Received finding** **Upper relative excess\.** The finding describes the upper front\-tooth set in relation to that supplied lower reference\. **Read together:** this is a finding about the upper front\-tooth set relative to the supplied lower front\-tooth reference\. “Upper relative excess” places the described excess on the upper side of that named comparison\. The anterior label keeps the statement about the two front\-tooth sets; the supplied lower reference explains the direction of its wording\. A reporting reference is the basis used to express the comparison\. It is not a declaration that the lower arch is clinically normal\. Likewise, this relative finding does not establish that the raw upper total is greater than the raw lower total, identify one abnormal upper tooth or select which arch to change\. It does not establish the presence or absence of a separate finding\. The useful interpretation is therefore complete at the relationship level: you know the compared sets, the supplied reference and which set the relative wording describes\. Individual tooth findings, goals and care decisions still need the responsible clinician’s explanation\. ## Keep the finding connected to the individual plan A reported proportion is one assessment finding\. Its wording does not choose aligners, a particular system or a procedure\. The study’s authors also identify uncertainty about which deviations affect final treatment outcomes; the finding alone does not predict your result\. The next useful connection is to the goals and steps your clinician explains\. [Read how assessment findings, treatment goals and review fit an aligner proposal]() \. SMILE\-FX® offers full\-service, digitally driven orthodontics with a clear\-aligner focus\. Board\-certified orthodontists see every patient, including at follow\-up visits\. That continuing responsibility is the place to connect a received finding with your own priorities and proposed care\. [Explore the full qualified care model]() \. ## Talk through the finding and your goals If you are considering new orthodontic care, you can request a free in\-person consultation at the one SMILE\-FX® studio in Miramar\. Bring the finding you have received and the questions it raises about the proposed bite and treatment goals\. [Request an in\-person consultation]() [Call \(954\) 824\-9707]() · [Studio details and contact]() 11225 Miramar Pkwy, STE B285, Miramar, FL 33025\. A request is not a confirmed appointment or case acceptance\. Confirm individual scope, fees and inclusions with the team; this page promises no records, imaging, referral, procedure, appliance suitability or outcome\. If you are already in treatment, use your treating team’s supplied contact route for current\-care questions\. ## Source context and adaptation credit This explanation adapts selected narrative from Aida Nur Ashikin Abd Rahman, Siti Adibah Othman and Anand Marya, Measuring tooth size discrepancies using Bolton analysis: a comparative cross\-sectional study among major ethnicity in Malaysia , BMC Oral Health 23:534 \(2023\), published August 2, 2023\. [Original article]() · [DOI: 10\.1186/s12903\-023\-03185\-7]() \. The article is licensed under [Creative Commons Attribution 4\.0 International \(CC BY 4\.0\)]() \. Changes: selected concepts have been reorganized and rewritten in plain English, with a new completed language example and separate practice context, for this SMILE\-FX® guide\. No source figures, tables, captions, equations, cases or direct third\-party quotations are reproduced\. The reporting\-reference discussion follows these authors’ account; the underlying study they cite was not independently reviewed\. The source is a clinic\-based Malaysian pretreatment comparative cross\-sectional cast study in Kuala Lumpur, not a treatment trial or guideline\. Methods reports 150 patients and 300 casts, while the abstract says 150 study casts; this guide retains that difference without reconciling it\. The study used complete erupted permanent dentition from first molar to opposite first molar and good pretreatment casts\. It excluded width\-affecting restorations or caries, congenital or deformed teeth, obvious wear, prior or ongoing orthodontic treatment, and mixed ancestry as classified by the study\. An age range was not established in the retained narrative\. The authors did not establish a Malaysian national norm\. This guide adopts no US norm, personal threshold, ethnic or sex\-based prediction, treatment recommendation or outcome forecast\. The selected discussion leaves outcome relevance uncertain\. These limits sit alongside the supported set\-and\-reference explanation\. Prepared with AI assistance for SMILE\-FX®; no named clinician review is claimed\. Reference does not imply endorsement by the authors or publisher\. The license supplies no warranties and may not provide every permission needed for a particular use; other applicable rights may remain\. The [license terms and disclaimer]() apply to the licensed material\. This static companion has no entry fields or submission\. [Read the existing guide’s privacy information]() \.