Dental Anatomy Past Paper PDF 2024

11 Lajneh Teejan Lajneh Wisdom Siham Al-Arag  Tooth Identification General Rules of Tooth Identification: 1- Curvature of the CEJ is about 1 mm less on the distal surface of the tooth than on the mesial 2-If the tooth roots curve, they usually curve distally, especially a...

11 Lajneh Teejan Lajneh Wisdom Siham Al-Arag  Tooth Identification General Rules of Tooth Identification: 1- Curvature of the CEJ is about 1 mm less on the distal surface of the tooth than on the mesial 2-If the tooth roots curve, they usually curve distally, especially at the apex of the root 3- The distal incisal edges of anterior teeth are more rounded than the mesial incisal edges 4- Mandibular anterior teeth tend to wear on the Labial incisal edges; maxillary teeth wear on the Lingual incisal edges 5- Permanent molars are generally smaller in Height and have fewer cusps the more posterior they are positioned 6- Permanent molars tend to have more Secondary and tertiary anatomy the more Posterior they are positioned. (1st molar -> primary anatomy, 2nd molar -> Secondary anatomy, 3rd molar -> tertiary anatomy) 7- Roots of molars tend to be shorter and closer together the more posterior the molars are positioned, and the roots are often fused into one. (First molars have the widest and longest roots of all molars) 8- The more posterior the molars are positioned; the more variation of.anatomy is evident → especially (2nd & 3rd molars) ❖Deciduous vs Permanent dentition To distinguish between these 2 sets, Deciduous teeth have these features: 1- Smaller in size 2- Smaller crown height to overall length 3- Greater Width/Height ratio 4- More bulging buccally and lingually, and demarcated buccal cervical ridges especially on primary molars 5- More prominent cervical ridges, incisal edges, Constricted cervix for crown and root 6- Roots are often flared, divergent and slender (Permanent teeth have stronger and thicker roots) These are called Set traits It’s when you define whether tooth is Permanent or Primary Incisors Incisal two thirds Appear flattened on Labial and lingual sides. Incisal edge, not a Cusp. 1-Maxillary Incisors Crown wider Mesiodistally than Faciolingually. Root has triangular Cross section; broader on facial side. a- Maxillary Central incisor Greater crown-to-root Ratio than lateral Incisors. Mesio-incisal angle Sharp (90 degrees). Contact area in incisal Third. Broad, smooth lingual Fossa with cingulum. b- Maxillary Lateral incisor Lesser crown-to-root Ratio than central Incisors. Mesio-incisal angle Rounded. Contact area at junction of middle and incisal Thirds Small cingulum; often with a lingual pit. - Right or LEFT! Mesio-incisal angles are more square than disto-incisal angles. Crest of cervical line more often displaced toward distal from labial or lingual view. Mesio-cervical line curves more incisally than distocervical line. 2- Mandibular incisor Smaller than maxillary Central or lateral incisor. Crown wider Faciolingually than Mesiodistally. Root with oval cross Section. Incisal edge wears on labial surface. Incisal edge angled toward the lingual side. a- Mandibular Central Incisor Incisal view: incisal edge perpendicular to facio- lingual axis of tooth. Mesial and distal lobes appear identical. -Mandibular Central: Right-Left = ▪ Cervical line curves more incisally on mesial than on Distal surface. Canines ▪ Height of curvature of cervical line on mesial greater than on distal surface. ▪ Root tip may have slight distal curve. ▪ Incisal edge worn wider on distal surface. a- Mandibular Lateral incisor Incisal view: distoincisal edge angled toward lingual side. Distal lobe appears larger than mesial lobe.  Canines Single conical cusp with well-developed mesiofacial lobe. Lingual cusp ridge from cusp tip to lingual fossa 1-Maxillary Canines Lingual surface has Well-developed Marginal ridges, Cingulum, and fossa. (Compared with mandibular canine ) Larger crown than Incisors and lower Canines; more distal Convexity mostly, the mandibular teeth are more rounded, less prominent cingulum and smaller in dimension Cusp tip directly Midcenter over root. -Maxillary Canines: Right-Left ▪ Cervical line curves more incisally on mesial than on distal. ▪ Incisal view: distofacial lobe elongated. ▪ Facial view: distal surface rounded. ▪ Contact area located more cervically 2 - Mandibular Canines Lingual surface almost Smooth with poorly Developed ridges, Cingulum, and fossa. Narrower mesiodistal Width than maxillary More wear on facial (labial) surface when compared with maxillary canine Less prominent in all aspects compared to maxillary Canine  Premolars At least two cusps, one a single facial cusp, with One or two lingual cusps. 1-Maxillary Premolars Two major cusps; Buccal and lingual. Wider faciolingually Than mesiodistally. Proximal view: facial And lingual cusps, Nearly same height; Located over root trunk. a- Maxillary First Premolar Facial cusp slightly Longer than lingual Cusp. 1mm Often has two roots; buccal and lingual. More than 95% Occlusal surface has well-developed central groove, with little supplemental grooving. Mesial surface has depression above contact area below cervical line and extending onto root. -Maxillary First Premolar: Right-Left ▪ Mesial marginal groove. (very distinguishing feature) ▪ Cervical line on mesial curves more occlusally than on distal surface, - Occlusal View: Mesio-facial cusp ridge forms 90-degree angle with Mesial marginal ridge. Disto-facial cusp ridge forms rounded angle with distal marginal ridge. b- Maxillary Second Premolar Facial and lingual Cusps are nearly same Height. Usually single rooted. Short central groove; numerous supplemental Grooves. No depression on mesial or distal crown surfaces. -Right-left: ▪ lingual cusp displaced toward mesial. Molars 2-Mandibular Premolar Prominent facial cusp with one or two much smaller lingual cusps. Nearly equal facio-lingual and mesiodistal widths. Proximal view: facial Cusp much larger with Tip at or near midaxis of Root; lingual cusp(s) Extend lingually past Lingual border of root. a- Mandibular First Premolar Proximal view: occlusal Surface tilted toward Lingual side. Cervical line on mesial Curves more occlusally Than on distal. Occlusal view: oval outline with strong transverse Ridge and no central pit. -Right-Left: ▪ Depression or groove where mesial marginal ridge Joins lingual cusp ridge. ▪ Distal marginal ridge more prominent b- Mandibular Second Premolar Occlusal view: pentagonal outline, with a central pit and no transverse ridge The biggest occlusal ( all Premolars are transitory teeth ,but it seems at lower 5 we’re very close to molars Proximal view: occlusal Surface less lingually Tilted. May have two lingual Cusps. -Right-Left ▪ Proximal view: more of occlusal surface visible from Distal than from mesial because of distal inclination ff crown-to-root axis. Molars Three to five cusps, with at least two facial. For all molar always distolingual cusp the smallest and rounded 1- Maxillary Molars Crowns wider facio-lingually than mesiodistally. Three roots: two on facial and one on lingual side. a- Maxillary First Molar Occlusal view: strong oblique ridge less likely to be Crossed by a groove. Three roots widely Separated. Often fifth cusp (Carabelli’s) on Mesiolingual cusp (it helps us distinguish its right or left ) b- Maxillary Second Molar Occlusal view: smaller Oblique ridge usually Interrupted by a groove. Right-left: ▪ mesiolingual Cusp larger than Distolingual cusp. ▪ Roots closer together. ▪ No fifth cusp. ▪ Distolingual cusp smaller than on First molar  c- Maxillary Third Molar Distolingual cusp Progressively smaller or Missing entirely. Big prominent 3 cusps No oblique ridge Heart shape Roots either fused or Very close together and Much shorter.(Very distinctive) -Right-left: ▪ Disto-facial Cusp much shorter than other molars. ▪ Roots curved distally. 2-Mandibular Molars Crowns wider (bigger) mesiodistally than faciolingually. (Compared to maxillary) Always Two roots: one mesial and one distal. a- Mandibular First Molar Three facial cusps and Two facial grooves. Roots widely separated and relatively vertical. b- Mandibular Second Molar -Right-Left ▪ Distal Only two cuspfacial cusps andFacial is smallest one facial (cuspgroove. always demarcate Roots closethe together. distal cusp) more Secondary anatomy than first lower molar Occlusal groove well Defined but travels Straight mesial to distal and forms a cross with Facial and lingual Grooves. -Right-Left: ▪ Buccal height of Contour in cervical third; Lingual height of Contour in middle third.  ‫‪c- Mandibular Third Molar similar to 2nd molar‬‬ ‫‪ Secondary and very tertiary anatomy.‬‬ ‫‪ Short roots, often fused and curved distally.‬‬ ‫‪-Right-left:‬‬ ‫‪▪ crown tapers distally; wider facio-lingually on‬‬ ‫‪mesial than on distal surface.‬‬ ‫منزًل‪ ،‬فقال لغُالمه‪ :‬ائتنا بال ّشفرة نعبث بها‪.‬فأنكرتُ عليه‪ ،‬فقال‪ :‬ما تكلّمتُ بكلم ٍة منذ أسلمتُ إًل وأنا أخطمها‬ ‫ا‬ ‫كان شداد بن أوس في ٍ‬ ‫سفر‪ ،‬فنزل‬ ‫ضة‪ ،‬فاكنزوا هؤًلء‬‫َ‬ ‫الذهب والف َّ‬ ‫َ‬ ‫الناس‬ ‫ُ‬ ‫ي‪ ،‬واحفظوا ما أقول لكم‪ :‬سمعتُ رسول هللا ﷺ يقول‪ :‬إذا كنز‬ ‫وأز ّمها غير كلمتي هذه‪ ،‬فال تحفظوها عل َّ‬ ‫الرشد‪ ،‬وأسألك شُكر نعمتك‪ ،‬وأسألك حُسن عبادتك‪ ،‬وأسألك قلباا سلي اما‪ ،‬وأسألك لساناا‬ ‫الكلمات‪ :‬اللهم إني أسألك الثَّبات في األمر‪ ،‬والعزيمة على ُّ‬ ‫شر ما تعلم‪ ،‬وأستغفرك لما تعلم‪ ،‬إنَّك أنت َّ‬ ‫عالم الغيوب‪.‬‬ ‫صادقاا‪ ،‬وأسألك من خير ما تعلم‪ ،‬وأعوذ بك من ِّ ّ‬ ‫تمت كتابة هذا الشيت صدقة جارية عن روح والدة زميلنا عمرو رائد من دفعة تيجا ن‬ ‫دعواتكم لها بالرحمة والمغفرة‬ ‫‪Thank you‬‬