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"ABSTRAKLatar Belakang: Konstriksi apikal adalah bagian sistem saluran akar dengan diameter terkecil dan merupakan titik acuan yang paling sering digunakan dokter gigi sebagai penghentian apikal untuk pembersihan, pembentukan, dan pengisian saluran akar untuk perawatan endodontik. Tujuan: Mengetahui variasi ukuran, lokasi, dan bentuk konstriksi apikal pada gigi premolar 1 mandibula dan gigi premolar 2 maksila. Metode: Penelitian ini menggunakan 66 sampel gigi yang telah diekstraksi dengan akar telah terbentuk sempurna tanpa tanda-tanda resorpsi eksternal. Sampel dipindai menggunakan micro-CT Bruker SkyScan 1173 dengan resolusi 50 m. Gigi dibuat menjadi transparan untuk menampilkan morfologi sistem saluran akar secara tiga dimensi. Analisis ukuran, lokasi, dan bentuk konstriksi apikal dilakukan menggunakan perangkat lunak Fiji ImageJ, CT Vox, CT An, dan CT Vol. Data dianalisis menggunakan uji T satu sampel. Hasil: Rerata jarak antara konstriksi apikal dan foramen apikal pada gigi premolar 1 mandibula adalah 0,619 mm dan pada gigi premolar 2 maksila adalah 0,647 mm dengan lokasi konstriksi apikal terbanyak yaitu lebih ke apikal. Bentuk konstriksi apikal terbanyak pada gigi premolar 1 mandibula dan gigi premolar 2 maksila adalah konstriksi apikal konvergen dan konstriksi apikal bercabang dua. Kesimpulan: Variasi ukuran, lokasi, dan bentuk konstriksi apikal harus menjadi pertimbangan dokter gigi dalam melakukan perawatan endodontik.

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ABSTRACTBackground Apical constriction is the smallest diameter of root canal system and also the most commonly used reference point by clinicians as the apical termination for cleaning, shaping, and obturation for root canal treatment. Objective This study aim to know the variation of size, location, and shape of apical constriction in mandibular first premolar and maxillary second premolar. Methods Total 66 samples of extracted premolar teeth with perfectly formed root and without sign of external resorption were collected. Each tooth was scanned using a Bruker Skyscan 1173 micro CT at a resolution of 50 m. The teeth were made transparent in order to reveal the root canal system morphology in three dimensions. The size, location, and shape of apical constriction was analyzed using Fiji ImageJ, CT Vox, CT An, and CT Vol software. Data were analyzed statistically by One sample T test. Result The average distance between apical constriction and apical foramen in mandibular first premolar is 0,619 mm and in maxillary second premolar is 0,647 mm with the most location of apical constriction inclining to apically. Most of apical constrictions shape in mandibular first premolar and maxillary second premolar is convergent apical constriction and branched apical constriction. Conclusion The variation of size, location, and shape of apical constriction should be considered by dentist in performing endodontic treatment."

"A reimplantation case of maxillary second incisive with periapical (radicular) cyst is reported. A 37 years old female who suffered periapical cyst on her maxillary second incisive requested conventional endodontic treatment in order to avoid to avoid tooth extraction. The tooth was treated with a conventional root canal treatment at the first visit. After the first treatment, the patient suffered a post endodontic treatment pain but was afraid to be operated with apex resection. On the second visit, the maxillary second incisive was extracted. On the third visit the patient requested periapical cyst removal after she received advices from her older sister (who was a medical doctor) about the important of removing cyst capsule in order to avoid cyst recurrency. The patient also requested her tooth reimplantation. Following her request, on her extracted maxillary second incisive, root canal filling and apex resection were done out side her mouth, followed by periapical curettage in the maxillary second incisive region. Then reimplantation was finally performed. Seven months later, the patient told that since her maxillary second incisive apex resection and reimplantation, she never suffered from any pain or swelling. Pain on the tooth percussion and palpation were negative. Tooth mobility was on level 2. There was no sign that periapical radiolucency was growing wider, eventhough it was not getting smaller at that moment. We classified the result of our treatment as "not fail" since we still need a longer time ensure wether or not the result will be able to be classified as "successful". Eventhough radiographic healing was still "uncertain", there was a hope that the patient will gain a "complete healing" after 2 years."

"It has been shown that more than 40 percent of the apical radiolucencies are radicular cyst, numerous endodontist claims that from 85 to 90 percent of apical lesions disappear or become reduced in size following conservative endodontic treatment and do not required surgical intervention. Maxillary anterior teeth are more frequently susceptible to trauma and there are numerous morphologic anomalies associated with maxillary incisors especially lateral incisors its call palato-radiocular groove (PRG), its caused non vital have been implicated in formation of periapical lesions. Periapical lesions can be cured by conventional endodontic treatment used Ca(OH)2 as an intracanal medication. One case with radicular cyst on the maxillary lateral incisors because of trauma 2 years ago will be presented. Fifteenth months during treatment showed that the cyst reduced in size and symptomless."