【Hua】評論

來源：Wheeler’s Dental ☆☆☆☆☆☆☆, ...

【Notorious】評論

The most likely places involve developmental grooves (Figure 13-26), often in relation to restorations. Fractures of cusps of the maxillary first premolar and mandibular first molars often occur along developmental grooves or stress lines as shown in Figure 13-26. Such fractures may occur in connection with bruxism and clenching. It is not uncommon for the distolingual cusp of the mandibular first molar to fracture in association with a large restoration, which leads to pulpitis.From Wheeler's Dental Anatomy...

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因兩者 發育溝（developme☆☆☆☆ ...