There may be a very small number of treatments recorded incorrectly, where for example a complex treatment miscoded into a lower band, such as inlays being recorded in Band 2.
Mae’n bosibl fod nifer bach iawn o driniaethau wedi’u cofnodi'n anghywir, er enghraifft triniaeth gymhleth wedi'i rhoi mewn band is mewn camgymeriad, megis mewnosodiadau yn cael eu cofnodi ym Mand 2.